Feeds › Ownership stakes (13D / 13G)
Ownership stakes (13D / 13G)
Investors who own more than 5% of a company, from activists (13D) to passive holders (13G).
About this data
- What it is
- An investor who owns more than 5% of a public company must say so. Investors who may try to influence the company, such as activists, file the longer Schedule 13D; passive holders file the shorter Schedule 13G.
- Who files it
- The investor, within days of crossing 5%, and again whenever the stake changes materially.
- How current
- We collect new filings throughout the day on SEC business days.
- Worth knowing
- 13G filings are far more common than 13D. A 13D usually means the investor intends to push for changes, so it tends to get more attention.
All of this comes from public filings.
Source and freshness · Information, not investment advice (disclaimer).
Filings per day, last 30 days
13D (activist) 13G (passive)
Latest ownership filings
Showing: ticker ALEC
| Filed | ScheduleBoth report a stake of more than 5%. A 13D is filed by investors who may try to influence the company, such as activists; a 13G by passive holders. | Company | Investor | Shares | % of shares | Filing |
|---|---|---|---|---|---|---|
| Oct 26, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | RA Capital Healthcare Fund, L.P. | 7.50M | 5.1% | SCHEDULE 13G ↗ |
| Oct 26, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Rajeev Shah | 7.50M | 5.1% | SCHEDULE 13G ↗ |
| Oct 26, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Peter Kolchinsky | 7.50M | 5.1% | SCHEDULE 13G ↗ |
| Oct 26, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | RA Capital Management, L.P. | 7.50M | 5.1% | SCHEDULE 13G ↗ |
| Oct 23, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | David Kroin | 12.77M | 8.6% | SCHEDULE 13G ↗ |
| Oct 23, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Deep Track Biotechnology Master Fund, Ltd. | 12.77M | 8.6% | SCHEDULE 13G ↗ |
| Oct 23, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Deep Track Capital, LP | 12.77M | 8.6% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Mark N. Lampert | 9.37M | 8.4% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | BVF Inc/Il | 9.37M | 8.4% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | BVF Partners L P/Il | 9.37M | 8.4% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | BVF GP Holdings LLC | 8.57M | 7.7% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | BVF Partners OS Ltd. | 619,317 | 0.6% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Biotechnology Value Trading Fund OS LP | 619,317 | 0.6% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | BVF II GP LLC | 3.67M | 3.3% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Biotechnology Value Fund II LP | 3.67M | 3.3% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | BVF I GP LLC | 4.90M | 4.4% | SCHEDULE 13G ↗ |
| Sep 18, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | Biotechnology Value Fund L P | 4.90M | 4.4% | SCHEDULE 13G ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Bryce Youngren | 4.87M | 4.4% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Amir Nashat | 4.99M | 4.5% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Terrance G. McGuire | 5.17M | 4.7% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Jonathan A. Flint | 4.89M | 4.4% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Brian Chee | 4.85M | 4.4% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | David Barrett | 4.85M | 4.4% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Polaris Venture Management Co VI, L.L.C. | 4.85M | 4.4% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Polaris Venture Partners VI (AIV-B), L.P. | 806,528 | 0.7% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Polaris Venture Partners VI (AIV), L.P. | 3.28M | 3.0% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Polaris Venture Partners Founders' Fund VI, L.P. | 267,979 | 0.2% | SCHEDULE 13G/A ↗ |
| May 14, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Polaris Venture Partners VI, L.P. | 498,468 | 0.5% | SCHEDULE 13G/A ↗ |
| Apr 27, 2026 | SCHEDULE 13G | ALEC Alector, Inc. | BlackRock, Inc. | 5.78M | 5.2% | SCHEDULE 13G ↗ |
| Mar 26, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | The Vanguard Group | 0 | 0.0% | SCHEDULE 13G/A ↗ |
| Feb 17, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Roderick Wong | 0 | 0.0% | SCHEDULE 13G/A ↗ |
| Feb 17, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | RTW Investments, LP | 0 | 0.0% | SCHEDULE 13G/A ↗ |
| Feb 6, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Arnon Rosenthal | 8.21M | 7.4% | SCHEDULE 13G/A ↗ |
| Jan 30, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | The Vanguard Group | 6.91M | 6.3% | SCHEDULE 13G/A ↗ |
| Jan 21, 2026 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | BlackRock, Inc. | 5.18M | 4.7% | SCHEDULE 13G/A ↗ |
| Nov 14, 2025 | SCHEDULE 13G | ALEC Alector, Inc. | Roderick Wong | 6.99M | 6.9% | SCHEDULE 13G ↗ |
| Nov 14, 2025 | SCHEDULE 13G | ALEC Alector, Inc. | RTW Investments, LP | 6.99M | 6.9% | SCHEDULE 13G ↗ |
| Nov 14, 2025 | SCHEDULE 13G | ALEC Alector, Inc. | Chen Yu | 10.00M | 9.2% | SCHEDULE 13G ↗ |
| Nov 14, 2025 | SCHEDULE 13G | ALEC Alector, Inc. | TCG Crossover Fund III, L.P. | 5.00M | 4.6% | SCHEDULE 13G ↗ |
| Nov 14, 2025 | SCHEDULE 13G | ALEC Alector, Inc. | TCG Crossover GP III, LLC | 5.00M | 4.6% | SCHEDULE 13G ↗ |
| Nov 14, 2025 | SCHEDULE 13G | ALEC Alector, Inc. | TCG Crossover Fund II, L.P. | 5.00M | 4.6% | SCHEDULE 13G ↗ |
| Nov 14, 2025 | SCHEDULE 13G | ALEC Alector, Inc. | TCG Crossover GP II, LLC | 5.00M | 4.6% | SCHEDULE 13G ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Bryce Youngren | 6.95M | 6.4% | SCHEDULE 13G/A ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Amir Nashat | 6.93M | 6.4% | SCHEDULE 13G/A ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Terrance G. McGuire | 7.10M | 6.5% | SCHEDULE 13G/A ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Jonathan A. Flint | 6.89M | 6.3% | SCHEDULE 13G/A ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Brian Chee | 6.88M | 6.3% | SCHEDULE 13G/A ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | David Barrett | 6.88M | 6.3% | SCHEDULE 13G/A ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Polaris Venture Management Co VI, L.L.C. | 6.85M | 6.3% | SCHEDULE 13G/A ↗ |
| Nov 13, 2025 | SCHEDULE 13G/A (amended) | ALEC Alector, Inc. | Polaris Venture Partners VI (AIV-B), L.P. | 1.18M | 1.1% | SCHEDULE 13G/A ↗ |
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