ARCH Venture Fund X, L.P. bought $20.0M of ASPE stock

By AlphaYouPublished Nov 3, 2026Form 4

Stocks in this disclosure

Reported activity

ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT

Reporting filer

ARCH Venture Fund X, L.P. reported buying 1,333,333 shares of Aspen Neuroscience, Inc. for about $20.0M ($15.00 a share on average). Form 4 filed Nov 3, 2026 lists 21 entries.

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Disclosed: Nov 3, 2026

Reported details

21 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	P	Purchase	66666	15.00	66,666	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: P equity Swap Involved: false transaction Shares: 66666 transaction Price Per Share: 15.00 transaction Acquired Disposed Code: A shares Owned Following Transaction: 66666 direct Or Indirect Ownership: D id: F1 id: F2
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	187182	Not stated (see footnotes)	253,848	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 187182 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 253848 direct Or Indirect Ownership: D id: F1 id: F2
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	298258	Not stated (see footnotes)	552,106	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 298258 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 552106 direct Or Indirect Ownership: D id: F1 id: F2
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	286304	Not stated (see footnotes)	838,410	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 286304 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 838410 direct Or Indirect Ownership: D id: F1 id: F2
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	295490	Not stated (see footnotes)	1,133,900	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 295490 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1133900 direct Or Indirect Ownership: D id: F1 id: F2
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	259948	Not stated (see footnotes)	1,393,848	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 259948 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1393848 direct Or Indirect Ownership: D id: F1 id: F2
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	P	Purchase	66667	15.00	66,667	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: P equity Swap Involved: false transaction Shares: 66667 transaction Price Per Share: 15.00 transaction Acquired Disposed Code: A shares Owned Following Transaction: 66667 direct Or Indirect Ownership: D id: F2 id: F4
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	298258	Not stated (see footnotes)	364,925	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 298258 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 364925 direct Or Indirect Ownership: D id: F2 id: F4
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	286304	Not stated (see footnotes)	651,229	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 286304 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 651229 direct Or Indirect Ownership: D id: F2 id: F4
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	295490	Not stated (see footnotes)	946,719	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 295490 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 946719 direct Or Indirect Ownership: D id: F2 id: F4
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	214355	Not stated (see footnotes)	1,161,074	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 214355 id: F3 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1161074 direct Or Indirect Ownership: D id: F2 id: F4
Common Stock	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	P	Purchase	1200000	15.00	1,200,000	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: P equity Swap Involved: false transaction Shares: 1200000 transaction Price Per Share: 15.00 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1200000 direct Or Indirect Ownership: I nature Of Ownership: See Footnote id: F5
Series Seed Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	187182	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series Seed Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 187182 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 187182 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F1 id: F2
Series A-1 Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	298258	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series A-1 Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 298258 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 298258 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F1 id: F2
Series A-1 Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	298258	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series A-1 Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 298258 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 298258 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F2 id: F4
Series A-2 Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	286304	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series A-2 Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 286304 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 286304 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F1 id: F2
Series A-2 Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	286304	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series A-2 Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 286304 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 286304 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F2 id: F4
Series B Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	295490	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series B Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 295490 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 295490 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F1 id: F2
Series B Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	295490	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series B Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 295490 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 295490 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F2 id: F4
Series C Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	259948	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series C Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 259948 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 259948 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F1 id: F2
Series C Convertible Preferred Stock (derivative)	ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT	2026-11-02	C	Conversion	214355	Not stated (see footnotes)	0	1 day	Filed terms security Title: Series C Convertible Preferred Stock id: F3 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: false transaction Shares: 214355 id: F3 transaction Acquired Disposed Code: D id: F3 id: F3 underlying Security Title: Common Stock underlying Security Shares: 214355 shares Owned Following Transaction: 0 direct Or Indirect Ownership: D id: F2 id: F4

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: P
Action: Purchase
Quantity: 66666
Price: 15.00
Following holdings: 66,666
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: false
transaction Shares: 66666
transaction Price Per Share: 15.00
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 66666
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 187182
Price: Not stated (see footnotes)
Following holdings: 253,848
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 187182
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 253848
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 298258
Price: Not stated (see footnotes)
Following holdings: 552,106
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 552106
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 286304
Price: Not stated (see footnotes)
Following holdings: 838,410
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 838410
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 295490
Price: Not stated (see footnotes)
Following holdings: 1,133,900
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1133900
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 259948
Price: Not stated (see footnotes)
Following holdings: 1,393,848
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 259948
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1393848
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: P
Action: Purchase
Quantity: 66667
Price: 15.00
Following holdings: 66,667
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: false
transaction Shares: 66667
transaction Price Per Share: 15.00
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 66667
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 298258
Price: Not stated (see footnotes)
Following holdings: 364,925
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 364925
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 286304
Price: Not stated (see footnotes)
Following holdings: 651,229
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 651229
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 295490
Price: Not stated (see footnotes)
Following holdings: 946,719
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 946719
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 214355
Price: Not stated (see footnotes)
Following holdings: 1,161,074
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 214355
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1161074
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: P
Action: Purchase
Quantity: 1200000
Price: 15.00
Following holdings: 1,200,000
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: false
transaction Shares: 1200000
transaction Price Per Share: 15.00
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1200000
direct Or Indirect Ownership: I
nature Of Ownership: See Footnote
id: F5

Series Seed Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 187182
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series Seed Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 187182
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 187182
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series A-1 Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 298258
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-1 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 298258
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series A-1 Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 298258
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-1 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 298258
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Series A-2 Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 286304
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-2 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 286304
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series A-2 Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 286304
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-2 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 286304
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Series B Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 295490
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series B Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 295490
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series B Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 295490
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series B Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 295490
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Series C Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 259948
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series C Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 259948
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 259948
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series C Convertible Preferred Stock (derivative)

Owner: ARCH Venture Fund X, L.P.; ARCH Venture Fund X Overage, L.P.; ARCH Venture Partners X, L.P.; ARCH Venture Partners X Overage, L.P.; ARCH Venture Partners X, LLC; CRANDELL KEITH; Burow Kristina; GILLIS STEVEN; NELSEN ROBERT
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 214355
Price: Not stated (see footnotes)
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series C Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 214355
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 214355
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Purchases, sales, grants and option exercises are different transactions. The reported code identifies the action; it does not establish a motive.

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.
ARCH Venture Fund X, L.P.: 10% owner.
ARCH Venture Fund X Overage, L.P.: 10% owner.
ARCH Venture Partners X, L.P.: 10% owner.
ARCH Venture Partners X Overage, L.P.: 10% owner.
ARCH Venture Partners X, LLC: 10% owner.
CRANDELL KEITH: 10% owner.
Burow Kristina: 10% owner.
GILLIS STEVEN: 10% owner.
NELSEN ROBERT: 10% owner.
F1: Securities held by ARCH Venture Fund X, L.P. ("ARCH X"). ARCH Venture Partners X, L.P. ("AVP X LP") is the sole general partner of ARCH X.
F2: ARCH Venture Partners X, LLC ("AVP X LLC") is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow, Steven Gillis, and Robert Nelsen (collectively, the "AVP X Committee Members") comprise the investment committee of AVP X LLC. AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. Each of AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members disclaims beneficial ownership except to the extent of any pecuniary interest therein.
F3: Each share of Series Seed Convertible Preferred Stock, Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series B Convertible Preferred Stock, and Series C Convertible Preferred Stock (collectively, the "Preferred Stock") automatically converted on a 1-for-9.8821 basis into shares of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date.
F4: Securities held by ARCH Venture Fund X Overage, L.P. ("ARCH X Overage"). ARCH Venture Partners X Overage, L.P. ("AVP X Overage LP") is the sole general partner of ARCH X Overage.
F5: Shares were purchased by ARCH Venture Fund XIV, L.P. ("ARCH XIV"). The AVP X Investment Committee Members also are members of the investment committee for ARCH XIV.

Original sources

SEC ownership filing

Prepared automatically from public filing data. Report a correction.

Security

Owner

Date

Code

Action

Quantity

Price

Following holdings

Reporting delay

Filed terms and references

Common Stock

2026-11-02

Purchase

66666

15.00

66,666

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: false
transaction Shares: 66666
transaction Price Per Share: 15.00
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 66666
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

2026-11-02

Conversion

187182

Not stated (see footnotes)

253,848

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 187182
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 253848
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

2026-11-02

Conversion

298258

Not stated (see footnotes)

552,106

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 552106
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

2026-11-02

Conversion

286304

Not stated (see footnotes)

838,410

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 838410
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

2026-11-02

Conversion

295490

Not stated (see footnotes)

1,133,900

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1133900
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

2026-11-02

Conversion

259948

Not stated (see footnotes)

1,393,848

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 259948
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1393848
direct Or Indirect Ownership: D
id: F1
id: F2

Common Stock

2026-11-02

Purchase

66667

15.00

66,667

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: false
transaction Shares: 66667
transaction Price Per Share: 15.00
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 66667
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

2026-11-02

Conversion

298258

Not stated (see footnotes)

364,925

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 364925
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

2026-11-02

Conversion

286304

Not stated (see footnotes)

651,229

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 651229
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

2026-11-02

Conversion

295490

Not stated (see footnotes)

946,719

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 946719
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

2026-11-02

Conversion

214355

Not stated (see footnotes)

1,161,074

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 214355
id: F3
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1161074
direct Or Indirect Ownership: D
id: F2
id: F4

Common Stock

2026-11-02

Purchase

1200000

15.00

1,200,000

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: false
transaction Shares: 1200000
transaction Price Per Share: 15.00
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1200000
direct Or Indirect Ownership: I
nature Of Ownership: See Footnote
id: F5

Series Seed Convertible Preferred Stock (derivative)

2026-11-02

Conversion

187182

Not stated (see footnotes)

1 day

Filed terms

security Title: Series Seed Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 187182
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 187182
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series A-1 Convertible Preferred Stock (derivative)

2026-11-02

Conversion

298258

Not stated (see footnotes)

1 day

Filed terms

security Title: Series A-1 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 298258
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series A-1 Convertible Preferred Stock (derivative)

2026-11-02

Conversion

298258

Not stated (see footnotes)

1 day

Filed terms

security Title: Series A-1 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 298258
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 298258
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Series A-2 Convertible Preferred Stock (derivative)

2026-11-02

Conversion

286304

Not stated (see footnotes)

1 day

Filed terms

security Title: Series A-2 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 286304
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series A-2 Convertible Preferred Stock (derivative)

2026-11-02

Conversion

286304

Not stated (see footnotes)

1 day

Filed terms

security Title: Series A-2 Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 286304
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 286304
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Series B Convertible Preferred Stock (derivative)

2026-11-02

Conversion

295490

Not stated (see footnotes)

1 day

Filed terms

security Title: Series B Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 295490
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series B Convertible Preferred Stock (derivative)

2026-11-02

Conversion

295490

Not stated (see footnotes)

1 day

Filed terms

security Title: Series B Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 295490
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 295490
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Series C Convertible Preferred Stock (derivative)

2026-11-02

Conversion

259948

Not stated (see footnotes)

1 day

Filed terms

security Title: Series C Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 259948
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 259948
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F1
id: F2

Series C Convertible Preferred Stock (derivative)

2026-11-02

Conversion

214355

Not stated (see footnotes)

1 day

Filed terms

security Title: Series C Convertible Preferred Stock
id: F3
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: false
transaction Shares: 214355
id: F3
transaction Acquired Disposed Code: D
id: F3
id: F3
underlying Security Title: Common Stock
underlying Security Shares: 214355
shares Owned Following Transaction: 0
direct Or Indirect Ownership: D
id: F2
id: F4

Filing context

Quantities and prices are shown in the units filed. No trade value is inferred from their product.

ARCH Venture Fund X, L.P.: 10% owner.

ARCH Venture Fund X Overage, L.P.: 10% owner.

ARCH Venture Partners X, L.P.: 10% owner.

ARCH Venture Partners X Overage, L.P.: 10% owner.

ARCH Venture Partners X, LLC: 10% owner.

CRANDELL KEITH: 10% owner.

Burow Kristina: 10% owner.

GILLIS STEVEN: 10% owner.

NELSEN ROBERT: 10% owner.

F1: Securities held by ARCH Venture Fund X, L.P. ("ARCH X"). ARCH Venture Partners X, L.P. ("AVP X LP") is the sole general partner of ARCH X.

F2: ARCH Venture Partners X, LLC ("AVP X LLC") is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow, Steven Gillis, and Robert Nelsen (collectively, the "AVP X Committee Members") comprise the investment committee of AVP X LLC. AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. Each of AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members disclaims beneficial ownership except to the extent of any pecuniary interest therein.

F3: Each share of Series Seed Convertible Preferred Stock, Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series B Convertible Preferred Stock, and Series C Convertible Preferred Stock (collectively, the "Preferred Stock") automatically converted on a 1-for-9.8821 basis into shares of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date.

F4: Securities held by ARCH Venture Fund X Overage, L.P. ("ARCH X Overage"). ARCH Venture Partners X Overage, L.P. ("AVP X Overage LP") is the sole general partner of ARCH X Overage.

F5: Shares were purchased by ARCH Venture Fund XIV, L.P. ("ARCH XIV"). The AVP X Investment Committee Members also are members of the investment committee for ARCH XIV.