Quick Takeaways
- Atlas Venture Fund XI, L.P. filed SCHEDULE 13D for SIONNA THERAPEUTICS, INC. Common Stock (SION).
- Disclosed ownership: 6.5%.
- Date of event: 10 Feb 2025.
Atlas Venture Fund XI, L.P. - 10 Feb 2025 SCHEDULE 13D Report for SIONNA THERAPEUTICS, INC. Common Stock (SION)
- Filing Manager
- Atlas Venture Fund XI, L.P.
- Reporting Manager
- Atlas Venture Fund XI, L.P.
- Symbol
- SION
- Shares outstanding
- 44,404,508 shares
- Disclosed Ownership
- 2,886,293 shares
- Ownership
- 6.5%
- Form type
- SCHEDULE 13D
- Filing time
- 18 Feb 2025, 16:59:13 UTC
- Date of event
- 10 Feb 2025
- Next filing
- 20 Oct 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Atlas Venture Fund XI, L.P. disclosed 6.5% ownership in SIONNA THERAPEUTICS, INC. Common Stock (SION) on 10 Feb 2025."
What Changed
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 18 Feb 2025, 16:59.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (6)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Atlas Venture Fund XI, L.P. | 6.5% | 2,886,293 | 0 | 2,886,293 | /s/ Ommer Chohan | Atlas Venture Associates XI, L.P., its GP, By Atlas Venture Associates XI, LLC, its GP, By: Ommer Chohan, CFO | 0001708269 |
| Atlas Venture Associates XI, L.P. | 6.5% | 2,886,293 | 0 | 2,886,293 | /s/ Ommer Chohan | Atlas Venture Associates XI, LLC, its GP, By: Ommer Chohan, CFO | 0001780068 |
| Atlas Venture Associates XI, LLC | 6.5% | 2,886,293 | 0 | 2,886,293 | /s/ Ommer Chohan | Ommer Chohan, CFO | 0001780067 |
| Atlas Venture Opportunity Fund II, L.P. | 1.8% | 807,727 | 0 | 807,727 | /s/ Ommer Chohan | Atlas Venture Associates Opportunity II, L.P., its GP, By: Atlas Venture Associates Opportunity II, LLC, its GP, By: Ommer Chohan, CFO | 0001885327 |
| Atlas Venture Associates Opportunity II, LP | 1.8% | 807,727 | 0 | 807,727 | /s/ Ommer Chohan | Atlas Venture Associates Opportunity II, LLC, its GP, By: Ommer Chohan, CFO | 0001935814 |
| Atlas Venture Associates Opportunity II, LLC | 1.8% | 807,727 | 0 | 807,727 | /s/ Ommer Chohan | By: Ommer Chohan, CFO | 0001935810 |