STOCK TITAN

RA Capital details Adicet Bio (ACET) pre-funded warrant and share stake

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Adicet Bio, Inc. received an initial ownership report from RA Capital–related entities, which are ten percent owners. The filing lists indirect holdings of a Pre-Funded Warrant exercisable into 1,152,833 shares of common stock at an exercise price of $0.0001 per share, plus 959,028 shares of common stock held indirectly.

The Pre-Funded Warrants are exercisable immediately and have no expiration date, but contain a 9.99% beneficial ownership cap that prevents exercises taking the group above that level. RA Capital Management, its general partner, the Fund, and Dr. Peter Kolchinsky and Mr. Rajeev Shah each disclaim beneficial ownership beyond their pecuniary interest.

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Insider RA CAPITAL MANAGEMENT, L.P., RA Capital Healthcare Fund LP, Kolchinsky Peter, Shah Rajeev M.
Role 10% Owner | 10% Owner | 10% Owner | 10% Owner
Type Security Shares Price Value
holding Pre-Funded Warrant (Right to Buy) -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Pre-Funded Warrant (Right to Buy) — 1,152,833 shares (Indirect, See footnotes); Common Stock — 959,028 shares (Indirect, See footnotes)
Footnotes (1)
  1. RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund"). 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, 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. Held directly by the Fund. The Pre-Funded Warrants have no expiration date and are exercisable immediately. Notwithstanding the foregoing, the Reporting Persons shall not be entitled to exercise the Pre-Funded Warrant if it would cause the aggregate number of shares of Common Stock beneficially owned by the Reporting Persons, their affiliates and any persons who are members of a Section 13(d) group with the Reporting Persons or their affiliates to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise. The Pre-Funded Warrants have no expiration date.
Pre-Funded Warrant underlying shares 1,152,833 shares Underlying common stock for pre-funded warrant, indirect holding
Pre-Funded Warrant exercise price $0.0001 per share Exercise price for pre-funded warrant into common stock
Indirect common stock holdings 959,028 shares Total shares of Adicet Bio common stock held indirectly
Beneficial ownership cap 9.99% Maximum aggregate beneficial ownership allowed after warrant exercise
Pre-Funded Warrant expiration No expiration date Warrants exercisable immediately with no stated expiry
Pre-Funded Warrant financial
"The Pre-Funded Warrants have no expiration date and are exercisable immediately."
A pre-funded warrant is a financial instrument that gives the holder the right to buy shares of a company's stock at a set price, with most of the purchase cost already paid upfront. It functions like a nearly fully paid option, allowing investors to secure shares quickly while minimizing the amount of additional money they need to invest later. This helps investors gain ownership rights efficiently, often used to avoid certain regulatory restrictions or to prepare for future stock purchases.
beneficial ownership regulatory
"disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
pecuniary interest financial
"disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein"
Section 13(d) group regulatory
"any persons who are members of a Section 13(d) group with the Reporting Persons or their affiliates"
ten percent owner regulatory
"reporting persons are marked as is_ten_percent_owner: 1"
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
RA CAPITAL MANAGEMENT, L.P.

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
02/17/2026
3. Issuer Name and Ticker or Trading Symbol
Adicet Bio, Inc. [ ACET ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock959,028ISee footnotes(1)(2)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Pre-Funded Warrant (Right to Buy) (3) (4)Common Stock1,152,833$0.0001ISee footnotes(1)(2)
1. Name and Address of Reporting Person*
RA CAPITAL MANAGEMENT, L.P.

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
RA Capital Healthcare Fund LP

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Kolchinsky Peter

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
1. Name and Address of Reporting Person*
Shah Rajeev M.

(Last)(First)(Middle)
C/O RA CAPITAL MANAGEMENT, L.P.
200 BERKELEY STREET, 18TH FLOOR

(Street)
BOSTON MASSACHUSETTS 02116

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)Other (specify below)
Explanation of Responses:
1. RA Capital Management, L.P. (the "Adviser") is the investment manager for RA Capital Healthcare Fund, L.P. (the "Fund"). 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, 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.
2. Held directly by the Fund.
3. The Pre-Funded Warrants have no expiration date and are exercisable immediately. Notwithstanding the foregoing, the Reporting Persons shall not be entitled to exercise the Pre-Funded Warrant if it would cause the aggregate number of shares of Common Stock beneficially owned by the Reporting Persons, their affiliates and any persons who are members of a Section 13(d) group with the Reporting Persons or their affiliates to exceed 9.99% of the total number of issued and outstanding shares of Common Stock of the Issuer following such exercise.
4. The Pre-Funded Warrants have no expiration date.
/s/ Peter Kolchinsky, Manager of RA Capital Management, L.P.04/13/2026
/s/ Peter Kolchinsky, Manager of RA Capital Healthcare Fund GP, LLC, the General Partner of RA Capital Healthcare Fund, L.P.04/13/2026
/s/ Peter Kolchinsky, individually04/13/2026
/s/ Rajeev Shah, individually04/13/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What did RA Capital report in its Form 3 for Adicet Bio (ACET)?

RA Capital–related entities reported indirect holdings in Adicet Bio, including pre-funded warrants for 1,152,833 common shares and 959,028 common shares. The filing establishes their status as ten percent owners while detailing the structure and limits of these positions.

How many Adicet Bio pre-funded warrant shares does RA Capital hold?

The entities reported a Pre-Funded Warrant giving the right to buy 1,152,833 Adicet Bio common shares at an exercise price of $0.0001. These warrants are exercisable immediately, have no expiration date, and are subject to a 9.99% beneficial ownership cap.

What common stock position in Adicet Bio (ACET) did RA Capital disclose?

They disclosed indirect ownership of 959,028 shares of Adicet Bio common stock. According to the footnotes, these shares are held directly by the RA Capital Healthcare Fund, while the related advisory entities and individuals disclaim beneficial ownership beyond their pecuniary interest.

What is the 9.99% beneficial ownership limit on RA Capital’s warrants?

The Pre-Funded Warrants cannot be exercised if doing so would cause the reporting persons, their affiliates, and any Section 13(d) group members to own over 9.99% of Adicet Bio’s outstanding common stock, effectively capping how much can be exercised at any time.

Do RA Capital and its principals claim full beneficial ownership of Adicet Bio securities?

No. The Adviser, its general partner, the Fund, and Dr. Peter Kolchinsky and Mr. Rajeev Shah each disclaim beneficial ownership of the reported securities, except to the extent of their respective pecuniary interest, limiting how their economic stake is characterized.