Third Rock funds trim Rapport Therapeutics (RAPP) stake under Rule 10b5-1 plan
Filing Impact
Filing Sentiment
Form Type
4
Rhea-AI Filing Summary
Rapport Therapeutics, Inc. significant shareholder entities affiliated with Third Rock Ventures reported open-market sales of common stock. Third Rock Ventures V, L.P. sold 271,495 shares on May 7, 2026 at a weighted average price of $40.1210 per share and 5,018 shares on May 8, 2026 at a weighted average price of $40.3060 per share, totaling 276,513 shares sold. These transactions were executed under a previously adopted Rule 10b5-1 trading plan. After the sales, the reporting entities hold 6,432,715 shares directly through Third Rock Ventures V, L.P. and 969,218 shares indirectly through Third Rock Ventures VI, L.P., indicating a large remaining position.
Positive
- None.
Negative
- None.
Insider Trade Summary 10b5-1
Net Seller: 276,513 shares ($11,094,906)
Net Sell
3 txns
Insider
Third Rock Ventures V, L.P., Third Rock Ventures GP V, LP, TRV GP V, LLC, Third Rock Ventures VI, L.P., Third Rock Ventures GP VI, L.P., TRV GP VI, LLC
Role
null | null | null | null | null | null
Sold
276,513 shs ($11.09M)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock | 5,018 | $40.306 | $202K |
| Sale | Common Stock | 271,495 | $40.121 | $10.89M |
| holding | Common Stock | -- | -- | -- |
Holdings After Transaction:
Common Stock — 6,432,715 shares (Direct, null);
Common Stock — 969,218 shares (Indirect, By Third Rock Ventures VI, L.P.)
Footnotes (1)
- The reported transactions were effected pursuant to a Rule 10b5-1 trading plan dated November 21, 2025, previously adopted by the Reporting Person. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.00 to $40.60, inclusive. The reporting person undertakes 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 sold at each separate price within the ranges set forth in this footnote (2). These shares are directly held by Third Rock Ventures V, L.P. ("TRV V"). The general partner of TRV V is Third Rock Ventures GP V, L.P. ("TRV GP V"). The general partner of TRV GP V is TRV GP V, LLC ("TRV GP V LLC"). Each of TRV GP V and TRV GP V LLC disclaims beneficial ownership of the shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that it is the beneficial owner of such shares. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.10 to $40.80, inclusive. The reporting person undertakes 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 sold at each separate price within the ranges set forth in this footnote (4). The shares are held directly by Third Rock Ventures VI, L.P. ("TRV VI"). The general partner of TRV VI is Third Rock Ventures GP VI, L.P. ("TRV GP VI"). The general partner of TRV GP VI is TRV GP VI, LLC ("TRV GP VI LLC"). Each of TRV GP VI, and TRV GP VI LLC, disclaims beneficial ownership of these shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that it is the beneficial owner of such shares. Each of Reporting Persons disclaims the existence of a Section 13(d) "group" as between any TRV V related parties and any TRV VI related parties and this report shall not be deemed an admission that any of such parties is or may be part of such a group with any of the other parties.
Key Figures
Shares sold May 7, 2026: 271,495 shares at $40.1210
Shares sold May 8, 2026: 5,018 shares at $40.3060
Total shares sold: 276,513 shares
+3 more
6 metrics
Shares sold May 7, 2026
271,495 shares at $40.1210
Open-market sale of common stock
Shares sold May 8, 2026
5,018 shares at $40.3060
Open-market sale of common stock
Total shares sold
276,513 shares
Net-sell direction per transaction summary
Direct holdings after transactions
6,432,715 shares
Common stock held by Third Rock Ventures V, L.P.
Indirect holdings
969,218 shares
Common stock held by Third Rock Ventures VI, L.P.
10b5-1 plan date
November 21, 2025
Date of trading plan governing reported sales
Key Terms
Rule 10b5-1 trading plan, weighted average price, pecuniary interest, Section 13(d) "group"
4 terms
Rule 10b5-1 trading plan financial
"The reported transactions were effected pursuant to a Rule 10b5-1 trading plan dated November 21, 2025"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average price financial
"The price reported is a weighted average price. These shares were sold in multiple transactions"
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
pecuniary interest financial
"disclaims beneficial ownership of the shares except to the extent of its pecuniary interest therein"
Section 13(d) "group" financial
"disclaims the existence of a Section 13(d) "group" as between any TRV V related parties and any TRV VI related parties"
