Third Rock sells 426,005 shares of RAPP

Third Rock Ventures V, LP reported proposed sale of 426,005 shares of Common stock of RAPP.

Rhea-AI Filing Summary

Third Rock Ventures V, LP reported proposed sale of 426,005 shares of Common stock of RAPP. The filing lists a sale date of 04/17/2026 and a dollar figure of $17,175,115.78 associated with that entry. The notice names Raymond James & Associates as the broker and references an earlier original issuance of 2,803,200 shares on 02/21/2023.

Insights

Securities Counsel

Routine Rule 144 sale notice for an institutional holder; disclosure-oriented, not an earnings event.

The Form 144 excerpt lists a proposed sale of 426,005 shares by Third Rock Ventures V, LP with an associated dollar figure of $17,175,115.78. It names Raymond James & Associates as the broker and records an earlier issuance of 2,803,200 shares on 02/21/2023.

These filings primarily permit compliance with Rule 144 resale conditions; cash‑flow treatment and timing beyond the listed dates are not stated in the excerpt. Subsequent SEC filings or transaction confirmations will show executed trades and exact proceeds.

Key Figures

Shares proposed for sale: 426,005 shares Associated dollar figure: $17,175,115.78 Original issuance: 2,803,200 shares

3 metrics

Shares proposed for sale 426,005 shares listed with date <date>04/17/2026</date>

Associated dollar figure $17,175,115.78 appears alongside the 426,005 share entry

Original issuance 2,803,200 shares recorded as Original Issuance on <date>02/21/2023</date>

Key Terms

Form 144, Original Issuance, Broker

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 | Issuer"

Broker market

"Raymond James & Associates, Inc. 880 Carillon Parkway"

A broker is a licensed professional or firm that helps investors buy and sell financial assets by executing trades on their behalf, acting like a marketplace agent or matchmaker between buyers and sellers. Brokers matter to investors because they provide access to markets, handle order execution and paperwork, and can offer research or advice—services that affect trade speed, costs, and the quality of investment decisions.

FAQ

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

What does the Form 144 for RAPP disclose?

The Form 144 discloses a proposed sale of 426,005 shares by Third Rock Ventures V, LP with a listed amount of $17,175,115.78. It names Raymond James & Associates as broker and notes an earlier issuance of 2,803,200 shares on 02/21/2023.

Who is the selling holder in the RAPP filing?

The filing identifies Third Rock Ventures V, LP as the selling holder. The entry shows a sale date of 04/17/2026 and lists 426,005 shares associated with that holder.

What broker is listed on the RAPP Form 144?

The broker named in the excerpt is Raymond James & Associates, Inc., with an address listed in St. Petersburg, FL. The filing pairs the broker name with the proposed sale information.

Does the Form 144 show proceeds from the sale for RAPP?

The excerpt includes a dollar figure of $17,175,115.78 next to the 426,005 shares entry. The filing does not further detail cash‑flow recipients or executed proceeds beyond that line.

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

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Accepted by SEC EDGAR 05/07/2026 - 04:44 PM 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, Inc. 880 Carillon Parkway St. Petersburg FL 33716	271495	10892705.19	47826929	05/07/2026	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

144: Remarks and Signature

Remarks
Date of Notice	05/07/2026
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 Kevin Gillis
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)