AP
Insider
Atlas Venture Fund XI, L.P.
10% ownerAtlas Venture Fund XI, L.P. (10% owner) filed 1 Form 4 report as a reporting entity in the past 24 months (1 purchase, 0 sales), most often in Sionna Therapeutics, Inc. (SION). Across 1 priced purchase filing, the average 21-session return was -31.5% from execution and -31.5% from disclosure (delay-adjusted; derived). The largest single filing was $1.1M of SION (60,000 sh × $18.00, as filed), executed Feb 10 2025. Data as of Nov 8 2026.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
-31.5%
avg across 1 priced filings
Delay-adjustediThe same average, entered at disclosure dates
-31.5%
same 1 filings, from disclosure
Filings, ttm
1
1 buys · 0 sells
Median delay
0d
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$1.1M
shares × price, as filed
Last traded
Feb 10 2025
Filed Feb 10 2025
Median ADV $10.0M across their filed names
Open performance→Volume by month
Buys $1.1M
Sells $0
Shares × price, as filed · by filing month · past 24 months
Sectors filed on
Healthcare
1 filing
Sector per market data · by filing · past 24 months
Most traded names
SIONRecent filings
SIONPURCHASE
Sionna Therapeutics, Inc.
View filing →
$1.1M60,000 sh × $18.00
Exec Feb 10 2025
Filed Feb 10 2025 · 5:30 PM ET