CTY: Nelsen Robert bought $3.1M of stock

By AlphaYouPublished Oct 19, 2026Form 4

Stocks in this disclosure

Reported activity

NELSEN ROBERT

Reporting filer

Nelsen Robert reported buying 170,000 shares of City Therapeutics, Inc. for about $3.1M ($18.00 a share on average). Form 4 filed Oct 19, 2026 lists 8 entries.

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Disclosed: Oct 19, 2026

Reported details

8 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Common Stock	NELSEN ROBERT	2026-10-19	C	Conversion	3294900	Not stated (see footnotes)	6,013,192	0 days	Filed terms security Title: Common Stock transaction Date: 2026-10-19 deemed Execution Date: transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Timeliness: transaction Shares: 3294900 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 6013192 direct Or Indirect Ownership: I nature Of Ownership: By ARCH Venture Fund XII, L.P. id: F2
Common Stock	NELSEN ROBERT	2026-10-19	C	Conversion	5482309	Not stated (see footnotes)	11,495,501	0 days	Filed terms security Title: Common Stock transaction Date: 2026-10-19 deemed Execution Date: transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Timeliness: transaction Shares: 5482309 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 11495501 direct Or Indirect Ownership: I nature Of Ownership: By ARCH Venture Fund XII, L.P. id: F2
Common Stock	NELSEN ROBERT	2026-10-19	C	Conversion	2027006	Not stated (see footnotes)	13,522,507	0 days	Filed terms security Title: Common Stock transaction Date: 2026-10-19 deemed Execution Date: transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Timeliness: transaction Shares: 2027006 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 13522507 direct Or Indirect Ownership: I nature Of Ownership: By ARCH Venture Fund XII, L.P. id: F2
Common Stock	NELSEN ROBERT	2026-10-19	P	Purchase	170000	18	13,692,507	0 days	Filed terms security Title: Common Stock transaction Date: 2026-10-19 deemed Execution Date: transaction Form Type: 4 transaction Code: P equity Swap Involved: 0 transaction Timeliness: transaction Shares: 170000 transaction Price Per Share: 18 transaction Acquired Disposed Code: A shares Owned Following Transaction: 13692507 direct Or Indirect Ownership: I nature Of Ownership: By ARCH Venture Fund XII, L.P. id: F2
Stock Option (Right to Buy) (derivative)	NELSEN ROBERT	2026-10-15	A	Grant or award	22649	0	22,649	4 days	Filed terms security Title: Stock Option (Right to Buy) conversion Or Exercise Price: 18 transaction Date: 2026-10-15 deemed Execution Date: transaction Form Type: 4 transaction Code: A equity Swap Involved: 0 transaction Timeliness: transaction Shares: 22649 transaction Price Per Share: 0 transaction Acquired Disposed Code: A id: F3 expiration Date: 2036-10-14 underlying Security Title: Common Stock underlying Security Shares: 22649 shares Owned Following Transaction: 22649 direct Or Indirect Ownership: D
Series Seed convertible preferred stock (derivative)	NELSEN ROBERT	2026-10-19	C	Conversion	3000000	0	0	0 days	Filed terms security Title: Series Seed convertible preferred stock id: F1 transaction Date: 2026-10-19 deemed Execution Date: transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Timeliness: transaction Shares: 3000000 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F1 id: F1 underlying Security Title: Common Stock underlying Security Shares: 3294900 shares Owned Following Transaction: 0 direct Or Indirect Ownership: I nature Of Ownership: By ARCH Venture Fund XII, L.P. id: F2
Series A convertible preferred stock (derivative)	NELSEN ROBERT	2026-10-19	C	Conversion	4991633	0	0	0 days	Filed terms security Title: Series A convertible preferred stock id: F1 transaction Date: 2026-10-19 deemed Execution Date: transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Timeliness: transaction Shares: 4991633 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F1 id: F1 underlying Security Title: Common Stock underlying Security Shares: 5482309 shares Owned Following Transaction: 0 direct Or Indirect Ownership: I nature Of Ownership: By ARCH Venture Fund XII, L.P. id: F2
Series B convertible preferred stock (derivative)	NELSEN ROBERT	2026-10-19	C	Conversion	1845585	0	0	0 days	Filed terms security Title: Series B convertible preferred stock id: F1 transaction Date: 2026-10-19 deemed Execution Date: transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Timeliness: transaction Shares: 1845585 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F1 id: F1 underlying Security Title: Common Stock underlying Security Shares: 2027006 shares Owned Following Transaction: 0 direct Or Indirect Ownership: I nature Of Ownership: By ARCH Venture Fund XII, L.P. id: F2

Common Stock

Owner: NELSEN ROBERT
Date: 2026-10-19
Code: C
Action: Conversion
Quantity: 3294900
Price: Not stated (see footnotes)
Following holdings: 6,013,192
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 3294900
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 6013192
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Common Stock

Owner: NELSEN ROBERT
Date: 2026-10-19
Code: C
Action: Conversion
Quantity: 5482309
Price: Not stated (see footnotes)
Following holdings: 11,495,501
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 5482309
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 11495501
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Common Stock

Owner: NELSEN ROBERT
Date: 2026-10-19
Code: C
Action: Conversion
Quantity: 2027006
Price: Not stated (see footnotes)
Following holdings: 13,522,507
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 2027006
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 13522507
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Common Stock

Owner: NELSEN ROBERT
Date: 2026-10-19
Code: P
Action: Purchase
Quantity: 170000
Price: 18
Following holdings: 13,692,507
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 170000
transaction Price Per Share: 18
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 13692507
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Stock Option (Right to Buy) (derivative)

Owner: NELSEN ROBERT
Date: 2026-10-15
Code: A
Action: Grant or award
Quantity: 22649
Price: 0
Following holdings: 22,649
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Stock Option (Right to Buy)
conversion Or Exercise Price: 18
transaction Date: 2026-10-15
deemed Execution Date:
transaction Form Type: 4
transaction Code: A
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 22649
transaction Price Per Share: 0
transaction Acquired Disposed Code: A
id: F3
expiration Date: 2036-10-14
underlying Security Title: Common Stock
underlying Security Shares: 22649
shares Owned Following Transaction: 22649
direct Or Indirect Ownership: D

Series Seed convertible preferred stock (derivative)

Owner: NELSEN ROBERT
Date: 2026-10-19
Code: C
Action: Conversion
Quantity: 3000000
Price: 0
Following holdings: 0
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Series Seed convertible preferred stock
id: F1
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 3000000
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 3294900
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Series A convertible preferred stock (derivative)

Owner: NELSEN ROBERT
Date: 2026-10-19
Code: C
Action: Conversion
Quantity: 4991633
Price: 0
Following holdings: 0
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Series A convertible preferred stock
id: F1
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 4991633
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 5482309
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Series B convertible preferred stock (derivative)

Owner: NELSEN ROBERT
Date: 2026-10-19
Code: C
Action: Conversion
Quantity: 1845585
Price: 0
Following holdings: 0
Reporting delay: 0 days
Filed terms and references: Filed terms
security Title: Series B convertible preferred stock
id: F1
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 1845585
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 2027006
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

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.
NELSEN ROBERT: Director, 10% owner.
F1: Each share of Series Seed convertible preferred stock, Series A convertible preferred stock and Series B convertible preferred stock (collectively, the "Preferred Stock") was convertible into Common Stock of the Issuer on a one-to-1.0983 basis at the option of the holder, and automatically converted into Common Stock upon the closing of the Issuer's initial public offering on October 19, 2026 without payment of consideration. The Preferred Stock had no expiration date.
F2: Shares held directly by ARCH Venture Fund XII, L.P. ("ARCH XII"). ARCH Venture Partners XII, L.P. ("AVP XII LP") is the sole general partner of ARCH XII. ARCH Venture Partners XII, LLC ("AVP XII LLC") is the sole general partner of AVP XII LP. Keith Crandell, Kristina Burow, Steven Gillis and Robert Nelsen are members of the investment committee of AVP XII LLC (the "AVP XII LLC Committee Members"). Each of AVP XII LP and AVP XII LLC may be deemed to beneficially own the shares held by ARCH XII, and each of the AVP XII LLC Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH XII. The Reporting Person disclaims beneficial ownership except to the extent of his pecuniary interest therein, if any.
F3: The shares underlying this option vest in full upon the earlier of (i) October 15, 2027 or (ii) the date of the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service on such vesting date.

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

NELSEN ROBERT

2026-10-19

Conversion

3294900

Not stated (see footnotes)

6,013,192

0 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 3294900
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 6013192
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Common Stock

NELSEN ROBERT

2026-10-19

Conversion

5482309

Not stated (see footnotes)

11,495,501

0 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 5482309
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 11495501
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Common Stock

NELSEN ROBERT

2026-10-19

Conversion

2027006

Not stated (see footnotes)

13,522,507

0 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 2027006
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 13522507
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Common Stock

NELSEN ROBERT

2026-10-19

Purchase

170000

13,692,507

0 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 170000
transaction Price Per Share: 18
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 13692507
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Stock Option (Right to Buy) (derivative)

NELSEN ROBERT

2026-10-15

Grant or award

22649

22,649

4 days

Filed terms

security Title: Stock Option (Right to Buy)
conversion Or Exercise Price: 18
transaction Date: 2026-10-15
deemed Execution Date:
transaction Form Type: 4
transaction Code: A
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 22649
transaction Price Per Share: 0
transaction Acquired Disposed Code: A
id: F3
expiration Date: 2036-10-14
underlying Security Title: Common Stock
underlying Security Shares: 22649
shares Owned Following Transaction: 22649
direct Or Indirect Ownership: D

Series Seed convertible preferred stock (derivative)

NELSEN ROBERT

2026-10-19

Conversion

3000000

0 days

Filed terms

security Title: Series Seed convertible preferred stock
id: F1
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 3000000
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 3294900
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Series A convertible preferred stock (derivative)

NELSEN ROBERT

2026-10-19

Conversion

4991633

0 days

Filed terms

security Title: Series A convertible preferred stock
id: F1
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 4991633
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 5482309
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Series B convertible preferred stock (derivative)

NELSEN ROBERT

2026-10-19

Conversion

1845585

0 days

Filed terms

security Title: Series B convertible preferred stock
id: F1
transaction Date: 2026-10-19
deemed Execution Date:
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Timeliness:
transaction Shares: 1845585
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F1
id: F1
underlying Security Title: Common Stock
underlying Security Shares: 2027006
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: By ARCH Venture Fund XII, L.P.
id: F2

Filing context

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

NELSEN ROBERT: Director, 10% owner.

F1: Each share of Series Seed convertible preferred stock, Series A convertible preferred stock and Series B convertible preferred stock (collectively, the "Preferred Stock") was convertible into Common Stock of the Issuer on a one-to-1.0983 basis at the option of the holder, and automatically converted into Common Stock upon the closing of the Issuer's initial public offering on October 19, 2026 without payment of consideration. The Preferred Stock had no expiration date.

F2: Shares held directly by ARCH Venture Fund XII, L.P. ("ARCH XII"). ARCH Venture Partners XII, L.P. ("AVP XII LP") is the sole general partner of ARCH XII. ARCH Venture Partners XII, LLC ("AVP XII LLC") is the sole general partner of AVP XII LP. Keith Crandell, Kristina Burow, Steven Gillis and Robert Nelsen are members of the investment committee of AVP XII LLC (the "AVP XII LLC Committee Members"). Each of AVP XII LP and AVP XII LLC may be deemed to beneficially own the shares held by ARCH XII, and each of the AVP XII LLC Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH XII. The Reporting Person disclaims beneficial ownership except to the extent of his pecuniary interest therein, if any.

F3: The shares underlying this option vest in full upon the earlier of (i) October 15, 2027 or (ii) the date of the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service on such vesting date.