Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Common Stock
- Shares / value
- 2,309,035
- Estimated value
- $84,095,054
- Report date
- 21 Oct 2025
- Price
- $36.42
- Ownership
- By Atlas Venture Fund XI, L.P.
Bruce Booth - Director at Sionna Therapeutics, Inc.
Issuer-level insider activity
- Role
- Director
- Issuer ticker
- SION on Nasdaq
- Entity type
- Individual
- Source filing history
- Open source filing history
Identity
Names, identifiers, and filing context for this profile.
1 identity field
Source evidence
Original filing metadata and source links for verification.
1 source field
No buys or sells have been reported by Bruce Booth since 08 Nov 2025
Reported holdings for Bruce Booth in Sionna Therapeutics, Inc.
Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Common Stock
- Shares / value
- 686,567
- Estimated value
- $25,004,770
- Report date
- 21 Oct 2025
- Price
- $36.42
- Ownership
- By Atlas Venture Opportunity Fund II, L.P.
Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Non-Qualified Stock Option (right to buy)
- Shares / value
- 17,340
- Estimated value
- Report date
- 17 Jun 2026
- Price
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Series A convertible preferred stock
- Shares / value
- 0
- Estimated value
- Report date
- 10 Feb 2025
- Price
- Ownership
- By Atlas Venture Fund XI, L.P.
- Underlying class
- Common Stock
- Underlying amount
Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Series B convertible preferred stock
- Shares / value
- 0
- Estimated value
- Report date
- 10 Feb 2025
- Price
- Ownership
- By Atlas Venture Fund XI, L.P.
- Underlying class
- Common Stock
- Underlying amount
Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Series C convertible preferred stock
- Shares / value
- 0
- Estimated value
- Report date
- 10 Feb 2025
- Price
- Ownership
- By Atlas Venture Fund XI, L.P.
- Underlying class
- Common Stock
- Underlying amount
Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Series C convertible preferred stock
- Shares / value
- 0
- Estimated value
- Report date
- 10 Feb 2025
- Price
- Ownership
- By Atlas Venture Opportunity Fund II, L.P.
- Underlying class
- Common Stock
- Underlying amount
Form 4 holding
Director
Sionna Therapeutics, Inc.
- Security class
- Series Seed convertible preferred stock
- Shares / value
- 0
- Estimated value
- Report date
- 10 Feb 2025
- Price
- Ownership
- By Atlas Venture Fund XI, L.P.
- Underlying class
- Common Stock
- Underlying amount
Transaction history for Bruce Booth in Sionna Therapeutics, Inc.
| Sym | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares after | Date | Ownership |
|---|
* marks a reported price that did not pass the local price check.