Third Rock files Form 144 disclosing stock sales

Third Rock Ventures V, LP reported sales of Common Stock in transactions reported on Form 144.

Rhea-AI Filing Summary

Third Rock Ventures V, LP reported sales of Common Stock in transactions reported on Form 144. The excerpt lists three dispositions: 426,005 shares for $17,175,115.78 on 04/17/2026, 271,495 shares for $47,826,929.00 on 05/07/2026, and 5,018 shares for $202,254.50 on 05/08/2026. The record also shows an original issuance of 2,803,200 shares on 02/21/2023.

Key Figures

Sale on 04/17/2026: 426,005 shares Proceeds 04/17/2026: $17,175,115.78 Sale on 05/07/2026: 271,495 shares +4 more

7 metrics

Sale on 04/17/2026 426,005 shares Disposition by Third Rock Ventures V, LP

Proceeds 04/17/2026 $17,175,115.78 Amount shown alongside 426,005 shares

Sale on 05/07/2026 271,495 shares Disposition by Third Rock Ventures V, LP

Proceeds 05/07/2026 $47,826,929.00 Amount shown alongside 271,495 shares

Sale on 05/08/2026 5,018 shares Disposition by Third Rock Ventures V, LP

Proceeds 05/08/2026 $202,254.50 Amount shown alongside 5,018 shares

Original issuance 2,803,200 shares Original issuance date <date>02/21/2023</date>

Key Terms

Form 144, Original Issuance, Securities Sold During The Past 3 Months

3 terms

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Original Issuance financial

"Common | 02/21/2023 | Original Issuance"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What transactions does the RAPP Form 144 excerpt show?

The excerpt shows three dispositions by Third Rock Ventures V, LP: 426,005 shares for $17,175,115.78 on 04/17/2026, 271,495 shares for $47,826,929.00 on 05/07/2026, and 5,018 shares for $202,254.50 on 05/08/2026. These appear under "Securities Sold During The Past 3 Months."

Who is the selling party reported in the RAPP excerpt?

The selling party identified is Third Rock Ventures V, LP with an address listed at 201 Brookline Ave, Ste 1401, Boston, MA 02215. The excerpt attributes the reported Common stock dispositions to that entity.

Does the excerpt show any original issuances for RAPP?

Yes. The excerpt records an original issuance of 2,803,200 shares on 02/21/2023 listed under "Securities To Be Sold" with the method labeled as Cash and the issuer indicated as Issuer.

Are the transaction proceeds disclosed in the RAPP excerpt?

Yes. Each sale line includes a dollar amount: $17,175,115.78, $47,826,929.00, and $202,254.50, shown alongside the corresponding share counts and trade dates in the provided rows.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/11/2026 - 04:25 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001778071
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Rapport Therapeutics, Inc.
SEC File Number	001-42121
Address of Issuer	99 HIGH STREET SUITE 2100 BOSTON MASSACHUSETTS 02110
Phone	857-321-8020
Name of Person for Whose Account the Securities are To Be Sold	Third Rock Ventures V, L.P.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	10% Stockholder

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Raymond James & Associates 880 Carillon Parkway St. Petersburg FL 33716	133618	5378124.50	47826929	05/11/2026	Nasdaq

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/21/2023	Original Issuance	Issuer			2803200	02/21/2023	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Third Rock Ventures V, LP 201 Brookline Ave Ste 1401 Boston MA 02215	Common	04/17/2026	426005	17175115.78
Third Rock Ventures V, LP 201 Brookline Ave Ste 1401 Boston MA 02215	Common	05/07/2026	271495	47826929.00
Third Rock Ventures V, LP 201 Brookline Ave Ste 1401 Boston MA 02215	Common	05/08/2026	5018	202254.50

144: Remarks and Signature

Remarks
Date of Notice	05/11/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/21/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Melissa Fisher, as duly authorized representative of Raymond James & Associates, Inc., as attorney-in-fact for Third Rock Ventures V L.P.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)