Ra Capital Management, L.p. bought $46.6M of BBTX stock

By AlphaYouPublished Nov 4, 2026Form 4

Stocks in this disclosure

Reported activity

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

Reporting filer

Ra Capital Management, L.p. reported buying 2,953,820 shares of Bambusa Therapeutics, Inc. for about $46.6M ($15.79 a share on average). Form 4 filed Nov 3, 2026 lists 10 entries.

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Disclosed: Nov 3, 2026

Reported details

10 entries

All validated entries in this disclosure
Security	Owner	Date	Code	Action	Quantity	Price	Following holdings	Reporting delay	Filed terms and references
Common Stock	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-10-30	P	Purchase	189909	14.23	189,909	4 days	Filed terms security Title: Common Stock transaction Date: 2026-10-30 transaction Form Type: 4 transaction Code: P equity Swap Involved: 0 transaction Shares: 189909 transaction Price Per Share: 14.23 id: F1 transaction Acquired Disposed Code: A shares Owned Following Transaction: 189909 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F3
Common Stock	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-10-30	P	Purchase	263911	14.92	453,820	4 days	Filed terms security Title: Common Stock transaction Date: 2026-10-30 transaction Form Type: 4 transaction Code: P equity Swap Involved: 0 transaction Shares: 263911 transaction Price Per Share: 14.92 id: F4 transaction Acquired Disposed Code: A shares Owned Following Transaction: 453820 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F3
Common Stock	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	C	Conversion	3144858	Not stated (see footnotes)	3,598,678	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 3144858 id: F5 transaction Acquired Disposed Code: A shares Owned Following Transaction: 3598678 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F3
Common Stock	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	C	Conversion	1331080	Not stated (see footnotes)	1,331,080	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 1331080 id: F5 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1331080 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F6
Common Stock	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	P	Purchase	2335109	16	5,933,787	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: P equity Swap Involved: 0 transaction Shares: 2335109 transaction Price Per Share: 16 transaction Acquired Disposed Code: A shares Owned Following Transaction: 5933787 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F3
Common Stock	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	P	Purchase	164891	16	1,495,971	1 day	Filed terms security Title: Common Stock transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: P equity Swap Involved: 0 transaction Shares: 164891 transaction Price Per Share: 16 transaction Acquired Disposed Code: A shares Owned Following Transaction: 1495971 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F6
Series A-1 Preferred Stock (derivative)	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	C	Conversion	2844910	0	0	1 day	Filed terms security Title: Series A-1 Preferred Stock id: F5 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 2844910 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F5 id: F5 underlying Security Title: Common Stock underlying Security Shares: 2844910 shares Owned Following Transaction: 0 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F3
Series A-1 Preferred Stock (derivative)	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	C	Conversion	1278148	0	0	1 day	Filed terms security Title: Series A-1 Preferred Stock id: F5 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 1278148 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F5 id: F5 underlying Security Title: Common Stock underlying Security Shares: 1278148 shares Owned Following Transaction: 0 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F6
Series A-2 Preferred Stock (derivative)	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	C	Conversion	299948	0	0	1 day	Filed terms security Title: Series A-2 Preferred Stock id: F5 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 299948 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F5 id: F5 underlying Security Title: Common Stock underlying Security Shares: 299948 shares Owned Following Transaction: 0 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F3
Series A-2 Preferred Stock (derivative)	RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.	2026-11-02	C	Conversion	52932	0	0	1 day	Filed terms security Title: Series A-2 Preferred Stock id: F5 transaction Date: 2026-11-02 transaction Form Type: 4 transaction Code: C equity Swap Involved: 0 transaction Shares: 52932 transaction Price Per Share: 0 transaction Acquired Disposed Code: D id: F5 id: F5 underlying Security Title: Common Stock underlying Security Shares: 52932 shares Owned Following Transaction: 0 direct Or Indirect Ownership: I nature Of Ownership: See footnotes id: F2 id: F6

Common Stock

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-10-30
Code: P
Action: Purchase
Quantity: 189909
Price: 14.23
Following holdings: 189,909
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-30
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 189909
transaction Price Per Share: 14.23
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 189909
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-10-30
Code: P
Action: Purchase
Quantity: 263911
Price: 14.92
Following holdings: 453,820
Reporting delay: 4 days
Filed terms and references: Filed terms
security Title: Common Stock
transaction Date: 2026-10-30
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 263911
transaction Price Per Share: 14.92
id: F4
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 453820
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 3144858
Price: Not stated (see footnotes)
Following holdings: 3,598,678
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: 0
transaction Shares: 3144858
id: F5
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 3598678
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 1331080
Price: Not stated (see footnotes)
Following holdings: 1,331,080
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: 0
transaction Shares: 1331080
id: F5
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1331080
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

Common Stock

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: P
Action: Purchase
Quantity: 2335109
Price: 16
Following holdings: 5,933,787
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: 0
transaction Shares: 2335109
transaction Price Per Share: 16
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 5933787
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: P
Action: Purchase
Quantity: 164891
Price: 16
Following holdings: 1,495,971
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: 0
transaction Shares: 164891
transaction Price Per Share: 16
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1495971
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

Series A-1 Preferred Stock (derivative)

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 2844910
Price: 0
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-1 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 2844910
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 2844910
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Series A-1 Preferred Stock (derivative)

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 1278148
Price: 0
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-1 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 1278148
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 1278148
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

Series A-2 Preferred Stock (derivative)

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 299948
Price: 0
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-2 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 299948
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 299948
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Series A-2 Preferred Stock (derivative)

Owner: RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.
Date: 2026-11-02
Code: C
Action: Conversion
Quantity: 52932
Price: 0
Following holdings: 0
Reporting delay: 1 day
Filed terms and references: Filed terms
security Title: Series A-2 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 52932
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 52932
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

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.
RA CAPITAL MANAGEMENT, L.P.: Director, 10% owner.
RA Capital Healthcare Fund LP: Director, 10% owner.
RA Capital Nexus Fund III, L.P.: Director.
Kolchinsky Peter: Director, 10% owner.
Shah Rajeev M.: Director, 10% owner.
F1: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.61 to $14.58 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
F2: RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund") and RA Capital Nexus Fund III, L.P. (the "Nexus Fund III"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. Each of the Adviser, the Adviser GP, the Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein.
F3: Held directly by the Fund.
F4: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $14.65 to $15.00 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.
F5: All shares of the preferred stock, par value $0.00001 per share, of the Issuer automatically converted on a one-for-one basis to shares of the Issuer's common stock, par value $0.00001 per share ("Common Stock") prior to the closing of the Issuer's initial public offering of its Common Stock.
F6: Held directly by the Nexus Fund III.

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

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-10-30

Purchase

189909

14.23

189,909

4 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-30
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 189909
transaction Price Per Share: 14.23
id: F1
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 189909
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-10-30

Purchase

263911

14.92

453,820

4 days

Filed terms

security Title: Common Stock
transaction Date: 2026-10-30
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 263911
transaction Price Per Share: 14.92
id: F4
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 453820
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Conversion

3144858

Not stated (see footnotes)

3,598,678

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 3144858
id: F5
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 3598678
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Conversion

1331080

Not stated (see footnotes)

1,331,080

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 1331080
id: F5
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1331080
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

Common Stock

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Purchase

2335109

5,933,787

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 2335109
transaction Price Per Share: 16
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 5933787
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Common Stock

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Purchase

164891

1,495,971

1 day

Filed terms

security Title: Common Stock
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: P
equity Swap Involved: 0
transaction Shares: 164891
transaction Price Per Share: 16
transaction Acquired Disposed Code: A
shares Owned Following Transaction: 1495971
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

Series A-1 Preferred Stock (derivative)

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Conversion

2844910

1 day

Filed terms

security Title: Series A-1 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 2844910
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 2844910
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Series A-1 Preferred Stock (derivative)

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Conversion

1278148

1 day

Filed terms

security Title: Series A-1 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 1278148
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 1278148
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

Series A-2 Preferred Stock (derivative)

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Conversion

299948

1 day

Filed terms

security Title: Series A-2 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 299948
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 299948
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F3

Series A-2 Preferred Stock (derivative)

RA CAPITAL MANAGEMENT, L.P.; RA Capital Healthcare Fund LP; RA Capital Nexus Fund III, L.P.; Kolchinsky Peter; Shah Rajeev M.

2026-11-02

Conversion

52932

1 day

Filed terms

security Title: Series A-2 Preferred Stock
id: F5
transaction Date: 2026-11-02
transaction Form Type: 4
transaction Code: C
equity Swap Involved: 0
transaction Shares: 52932
transaction Price Per Share: 0
transaction Acquired Disposed Code: D
id: F5
id: F5
underlying Security Title: Common Stock
underlying Security Shares: 52932
shares Owned Following Transaction: 0
direct Or Indirect Ownership: I
nature Of Ownership: See footnotes
id: F2
id: F6

Filing context

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

RA CAPITAL MANAGEMENT, L.P.: Director, 10% owner.

RA Capital Healthcare Fund LP: Director, 10% owner.

RA Capital Nexus Fund III, L.P.: Director.

Kolchinsky Peter: Director, 10% owner.

Shah Rajeev M.: Director, 10% owner.

F1: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $13.61 to $14.58 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

F2: RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund") and RA Capital Nexus Fund III, L.P. (the "Nexus Fund III"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. Each of the Adviser, the Adviser GP, the Fund, the Nexus Fund III, Dr. Kolchinsky and Mr. Shah disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein.

F3: Held directly by the Fund.

F4: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $14.65 to $15.00 inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

F5: All shares of the preferred stock, par value $0.00001 per share, of the Issuer automatically converted on a one-for-one basis to shares of the Issuer's common stock, par value $0.00001 per share ("Common Stock") prior to the closing of the Issuer's initial public offering of its Common Stock.

F6: Held directly by the Nexus Fund III.