Astria Therapeutics, Inc.
Astria Therapeutics, Inc. (ATXS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ATXS · as of Mar 31, 2025
Ownership Breakdown
115
Institutional Holders
▲ 1 vs Q4
$311.45M
Total Inst. Value
▼ $211.92M vs Q4
57.08M
Shares Outstanding
freeFloat 68.63%
58.32M
13F Shares Held
▼ 224,122 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ATXS largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC pharmaceutical preparations | 6.94M | 11.96% | 11.96% | $37.04B | May 12, 2025 | ▼ 887.0K |
PERCEPTIVE ADVISORS LLC pharmaceutical preparations | 6.49M | 11.18% | 11.18% | $34.63B | Aug 6, 2025 | — held |
RA CAPITAL MANAGEMENT, L.P. pharmaceutical preparations | 5.11M | 8.80% | 8.80% | $27.26B | May 15, 2025 | — held |
VESTAL POINT CAPITAL, LP pharmaceutical preparations | 4.18M | 7.21% | 7.21% | $22.32B | May 15, 2025 | — held |
BLACKROCK, INC. pharmaceutical preparations | 3.83M | 6.60% | 6.60% | $20.44B | May 2, 2025 | ▼ 68.4K |
FCPM III SERVICES B.V. pharmaceutical preparations | 3.82M | 6.59% | 6.59% | $20.41B | May 15, 2025 | ▲ 950.0K |
FAIRMOUNT FUNDS MANAGEMENT LLC pharmaceutical preparations | 3.55M | 6.13% | 6.13% | $18.98B | May 15, 2025 | — held |
TCG CROSSOVER MANAGEMENT, LLC pharmaceutical preparations | 2.76M | 4.76% | 4.76% | $14.75B | May 14, 2025 | — held |
VANGUARD GROUP INC pharmaceutical preparations | 2.65M | 4.57% | 4.57% | $14.14B | May 9, 2025 | ▼ 29.1K |
VR ADVISER, LLC pharmaceutical preparations | 2.46M | 4.24% | 4.24% | $13.12B | May 15, 2025 | — held |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
17
Increased
+2.51M shares2
New Positions
first time holders20
Decreased
−2.67M shares0
Sold Out
fully exitedNet shares change (top 50)
161.7K
+2.51M / −2.67M
Net new holders
-1
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ATXS insider trading · insider activity
Source: SEC Form 4
5
Buy transactions
49
Sell transactions
0.10
Buy/Sell ratio
$3M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Violin Jonathan director | Jan 23, 2026 | D-Return | 14,100 | $11.35 | $160.0K | 0 | Form 4 ↗ |
Violin Jonathan director | Jan 23, 2026 | D-Return | 8,333 | $3.00 | $25.0K | 0 | Form 4 ↗ |
Violin Jonathan director | Jan 23, 2026 | D-Return | 14,100 | $9.18 | $129.4K | 0 | Form 4 ↗ |
Violin Jonathan director | Jan 23, 2026 | D-Return | 263,321 | — | — | 0 | Form 4 ↗ |
Violin Jonathan director | Jan 23, 2026 | D-Return | 14,166 | $12.24 | $173.4K | 0 | Form 4 ↗ |
Violin Jonathan director | Jan 23, 2026 | D-Return | 26,550 | $5.79 | $153.7K | 0 | Form 4 ↗ |
Morabito Christopher Chief Medical Officer | Jan 23, 2026 | D-Return | 80,000 | $3.87 | $309.6K | 0 | Form 4 ↗ |
Morabito Christopher Chief Medical Officer | Jan 23, 2026 | D-Return | 262,500 | $6.41 | $1.68M | 0 | Form 4 ↗ |
Milne Jill C. CEO and President | Jan 23, 2026 | D-Return | 761,000 | $6.41 | $4.88M | 0 | Form 4 ↗ |
Milne Jill C. CEO and President | Jan 23, 2026 | D-Return | 4,377 | — | — | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Astria Therapeutics, Inc. (ATXS) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 31.37%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Astria Therapeutics, Inc. is FMR LLC, holding approximately 6.94 million shares — equal to 11.96% of outstanding shares — as of March 31, 2025.
A total of 115 institutional investors currently hold ATXS stock, with a combined institutional value of approximately $311,448,316 as of the most recent 13F filing period.
Frequently asked questions
ATXS ownershipAstria Therapeutics, Inc. (ATXS) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is FMR LLC with a 11.96% stake. Company insiders hold 31.37%. Data sourced from SEC Form 13F as of March 31, 2025.