Third Rock sells 836,136 RAPP shares across April–May 2026 (RAPP)

Rhea-AI Filing Summary

Third Rock Ventures V, L.P. reported dispositions of Common Stock of RAPP. The excerpt lists secondary sales on 04/17/2026 of 426,005 shares for $17,175,115.78, on 05/07/2026 of 271,495 shares for $47,826,929.00, on 05/08/2026 of 5,018 shares for $202,254.50, and on 05/11/2026 of 133,618 shares for $5,378,124.50. The filing lists an original issuance on 02/21/2023 of 2,803,200 shares (cash).

Insights

Securities Compliance Analyst

Filing documents resale transactions by an early investor across April–May 2026.

The excerpt lists four resale transactions by Third Rock Ventures V, L.P. with exact share counts and gross proceeds noted on specific dates (04/17/2026, 05/07/2026, 05/08/2026, 05/11/2026).

These entries are routine resale disclosures under Rule 144; cash‑flow recipients are the selling holder(s) as shown. Further filings would be needed to see any lockup, volume limitations, or broker details.

Corporate Finance Associate

Transaction sizes and dates are clearly stated; impact depends on total float.

The filing gives gross proceeds per trade (e.g., $47,826,929.00 on 05/07/2026) and exact shares sold. Without an outstanding share count in the excerpt, proportional impact cannot be assessed.

Subsequent SEC or company filings may show remaining holdings or registration status that clarify potential market overhang.

Key Figures

Shares sold 04/17/2026: 426,005 shares Proceeds 04/17/2026: $17,175,115.78 Shares sold 05/07/2026: 271,495 shares +6 more

9 metrics

Shares sold 04/17/2026 426,005 shares sale on <date>04/17/2026

Proceeds 04/17/2026 $17,175,115.78 gross proceeds reported for 426,005 shares

Shares sold 05/07/2026 271,495 shares sale on <date>05/07/2026

Proceeds 05/07/2026 $47,826,929.00 gross proceeds reported for 271,495 shares

Shares sold 05/08/2026 5,018 shares sale on <date>05/08/2026

Proceeds 05/08/2026 $202,254.50 gross proceeds reported for 5,018 shares

Shares sold 05/11/2026 133,618 shares sale on <date>05/11/2026

Proceeds 05/11/2026 $5,378,124.50 gross proceeds reported for 133,618 shares

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

Key Terms

Form 144, Original Issuance, selling holder

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"

selling holder regulatory

"Third Rock Ventures V. LP 201 Brookline Ave Ste 1401 Boston MA 02215 | Common"

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	18572	742880.00	47826929	05/26/2026	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
Third Rock Ventures V. LP 201 Brookline Ave Ste 1401 Boston MA 02215	Common	05/11/2026	133618	5378124.50

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What sales did Third Rock Ventures report for RAPP?

The filing lists four sales: 426,005 shares (04/17/2026) for $17,175,115.78, 271,495 shares (05/07/2026) for $47,826,929.00, 5,018 shares (05/08/2026) for $202,254.50, and 133,618 shares (05/11/2026) for $5,378,124.50.

Does the excerpt show when the shares were originally issued?

Yes. The excerpt records an original issuance on 02/21/2023 of 2,803,200 shares issued for cash, listed under "Original Issuance" in the securities section.

Who received the cash from the reported sales?

The excerpt attributes the sales to Third Rock Ventures V, L.P., indicating the selling holder received the proceeds. The filing does not state any other recipient for those proceeds.

Are these transactions Form 144 resale disclosures or issuer sales?

The entries are resale transactions disclosed on a Form 144 filing; the sales are by a selling holder rather than primary issuer offerings, as shown by the holder name and gross proceeds listed.

Do the sales indicate the remaining holdings of the seller?

The excerpt provides share counts sold and proceeds but does not state the seller's remaining beneficial holdings or percentages; remaining position details are not included in this excerpt.