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 SION
| 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 |
|---|---|---|---|---|---|---|
| Nov 9, 2026 | SCHEDULE 13G | SION Sionna Therapeutics, Inc. | Goldman Sachs & Co. LLC | 2.64M | 5.8% | SCHEDULE 13G ↗ |
| Nov 9, 2026 | SCHEDULE 13G | SION Sionna Therapeutics, Inc. | The Goldman Sachs Group, Inc. | 2.64M | 5.8% | SCHEDULE 13G ↗ |
| Sep 21, 2026 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | RA Capital Nexus Fund III, L.P. | 2.20M | 4.9% | SCHEDULE 13D/A ↗ |
| Sep 21, 2026 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | RA Capital Healthcare Fund, L.P. | 3.45M | 7.6% | SCHEDULE 13D/A ↗ |
| Sep 21, 2026 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Rajeev Shah | 6.48M | 14.3% | SCHEDULE 13D/A ↗ |
| Sep 21, 2026 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Peter Kolchinsky | 6.48M | 14.3% | SCHEDULE 13D/A ↗ |
| Sep 21, 2026 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | RA Capital Management, L.P. | 6.48M | 14.3% | SCHEDULE 13D/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Rose Sharon Shabet | 3.20M | 7.1% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Halvorsen Ole Andreas | 3.20M | 7.1% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Opportunities Drawdown (Aggregator) LP | 1.16M | 2.6% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Opportunities Drawdown Portfolio GP LLC | 1.16M | 2.6% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Opportunities Drawdown GP LLC | 1.16M | 2.6% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Opportunities Illiquid Investments Sub-Master LP | 2.04M | 4.5% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Opportunities Portfolio GP LLC | 2.04M | 4.5% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Opportunities GP LLC | 2.04M | 4.5% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Opportunities Parent GP LLC | 3.20M | 7.1% | SCHEDULE 13G/A ↗ |
| May 15, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Viking Global Investors LP | 3.20M | 7.1% | SCHEDULE 13G/A ↗ |
| May 12, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Q Healthcare Holding LLC | 2.02M | 4.5% | SCHEDULE 13G/A ↗ |
| May 12, 2026 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | Qatar Investment Authority | 2.02M | 4.5% | SCHEDULE 13G/A ↗ |
| Apr 20, 2026 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | OrbiMed Capital GP VIII LLC | 2.97M | 6.6% | SCHEDULE 13D/A ↗ |
| Apr 20, 2026 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Orbimed Advisors LLC | 2.97M | 6.6% | SCHEDULE 13D/A ↗ |
| Nov 7, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | RA Capital Nexus Fund III, L.P. | 2.24M | 5.0% | SCHEDULE 13D/A ↗ |
| Nov 7, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | RA Capital Healthcare Fund, L.P. | 6.91M | 15.5% | SCHEDULE 13D/A ↗ |
| Nov 7, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Rajeev Shah | 10.07M | 22.6% | SCHEDULE 13D/A ↗ |
| Nov 7, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Peter Kolchinsky | 10.07M | 22.6% | SCHEDULE 13D/A ↗ |
| Nov 7, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | RA Capital Management, L.P. | 10.07M | 22.6% | SCHEDULE 13D/A ↗ |
| Oct 31, 2025 | SCHEDULE 13G/A (amended) | SION Sionna Therapeutics, Inc. | JPMorgan Chase & Co. | 1.98M | 4.4% | SCHEDULE 13G/A ↗ |
| Oct 20, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Atlas Venture Associates Opportunity II, LLC | 701,985 | 1.6% | SCHEDULE 13D/A ↗ |
| Oct 20, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Atlas Venture Associates Opportunity II, LP | 701,985 | 1.6% | SCHEDULE 13D/A ↗ |
| Oct 20, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Atlas Venture Opportunity Fund II, L.P. | 701,985 | 1.6% | SCHEDULE 13D/A ↗ |
| Oct 20, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Atlas Venture Associates XI, LLC | 2.38M | 5.4% | SCHEDULE 13D/A ↗ |
| Oct 20, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Atlas Venture Associates XI, L.P. | 2.38M | 5.4% | SCHEDULE 13D/A ↗ |
| Oct 20, 2025 | SCHEDULE 13D/A (amended) | SION Sionna Therapeutics, Inc. | Atlas Venture Fund XI, L.P. | 2.38M | 5.4% | SCHEDULE 13D/A ↗ |
| Jul 30, 2025 | SCHEDULE 13G | SION Sionna Therapeutics, Inc. | JPMorgan Chase & Co. | 2.22M | 5.0% | SCHEDULE 13G ↗ |
| Jun 16, 2025 | SCHEDULE 13G | SION Sionna Therapeutics, Inc. | Q Healthcare Holding LLC | 2.21M | 5.0% | SCHEDULE 13G ↗ |
| Jun 16, 2025 | SCHEDULE 13G | SION Sionna Therapeutics, Inc. | Qatar Investment Authority | 2.21M | 5.0% | SCHEDULE 13G ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Jon Winkelried | 6.68M | 15.2% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | James G. Coulter | 6.68M | 15.2% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | TPG GP A, LLC | 6.68M | 15.2% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Atlas Venture Associates Opportunity II, LLC | 807,727 | 1.8% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Atlas Venture Associates Opportunity II, LP | 807,727 | 1.8% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Atlas Venture Opportunity Fund II, L.P. | 807,727 | 1.8% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Atlas Venture Associates XI, LLC | 2.89M | 6.5% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Atlas Venture Associates XI, L.P. | 2.89M | 6.5% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Atlas Venture Fund XI, L.P. | 2.89M | 6.5% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | RA Capital Nexus Fund III, L.P. | 2.32M | 5.3% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | RA Capital Healthcare Fund, L.P. | 6.92M | 15.7% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Rajeev Shah | 10.45M | 23.7% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | Peter Kolchinsky | 10.45M | 23.7% | SCHEDULE 13D ↗ |
| Feb 18, 2025 | SCHEDULE 13D | SION Sionna Therapeutics, Inc. | RA Capital Management, L.P. | 10.45M | 23.7% | SCHEDULE 13D ↗ |
Full history on every feed is part of Premium. Premium loads older rows, up to 10,000, and CSV downloads.
The newest 50 items, most recent first. Every row links to its original filing. Updated Nov 15, 2026, 6:27 PM EST.
Download CSV The rows of this feed, with the filters above. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.
Other feeds: Congressional trades · Executive-branch trades · Bills in Congress · Roll-call votes · Corporate PAC donations · Lobbying · Capitol Hires · Lobbying and contracts · Government contracts · Insider trades · Planned insider sales · Executive pay · Institutional holdings (13F) · Short interest · Fails to deliver · Daily short volume · Wikipedia page views · App store ratings · H-1B visa applications · Stock splits · 8-K events · IPO filings · Deals · Private placements (Form D) · Merger clearances (HSR) · Layoff notices (WARN) · SEC enforcement · Patents · Clinical trial updates · FDA approvals and clearances