Tourmaline Bio, Inc.
TRMLDelisted Oct 28, 2025- Industry
- Biological Products, (No Diagnostic Substances)
- SEC CIK
- 0001827506
Tourmaline Bio, Inc. was delisted on Oct 28, 2025; its insiders filed their last Form 4 on Oct 28, 2025; 134 institutions reported holding it in 13F filings for Q3 2025, worth $1.03B in total; no superinvestor held it.
Holders of 5% or more of TRML
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Tourmaline Bio, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Avoro Capital Advisors LLC | 13G/A | 9.95%2.56M shares | – | Aug 14, 20251 filing | Aug 14, 2025 | SEC |
| QVT Financial LP | 13G/A | 8.39%2.15M shares | +2.65 ppfrom 5.74% | May 15, 20252 filings | Aug 14, 2025 | SEC |
| BlackRock, Inc. | 13G/A | 5.50%1.41M shares | – | Oct 17, 20251 filing | Oct 17, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
6 Schedule 13D and 13G filings on Tourmaline Bio, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Nov 14, 20254:19 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 0.00%0 shares | –Below 5% | Sep 30, 2025 | SEC |
| Oct 17, 20256:24 PM ET | BlackRock, Inc. | 13G/A | 5.50%1.41M shares | – | Sep 30, 2025 | SEC |
| Aug 14, 20254:00 PM ET | QVT Financial LP | 13G/A | 8.39%2.15M shares | +2.65 ppfrom 5.74% | Jun 30, 2025 | SEC |
| Aug 14, 20257:04 AM ET | Avoro Capital Advisors LLCand 1 other | 13G/A | 9.95%2.56M shares | – | Jun 30, 2025 | SEC |
| May 15, 20254:22 PM ET | QVT Financial LP | 13G | 5.74%1.47M shares | New | Mar 31, 2025 | SEC |
| Feb 14, 20255:09 PM ET | Blue Owl Capital Holdings LP | 13G/A | 4.20%1.08M shares | –Below 5% | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Tourmaline Bio, Inc. shares.
No Form 144 notices for Tourmaline Bio, Inc. are on file.