Atai Beckley Inc.
Atai Beckley Inc. (ATAI) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ATAI · as of Sep 30, 2025
Ownership Breakdown
138
Institutional Holders
▲ 40 vs Q2
$231.06M
Total Inst. Value
▲ $167.17M vs Q2
368.17M
Shares Outstanding
freeFloat 54.34%
43.67M
13F Shares Held
▲ 14.50M vs Q2
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
ATAI largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
UBS GROUP AG pharmaceutical preparations | 7.68M | 3.53% | 3.53% | $40.61B | Nov 13, 2025 | ▼ 22.5K |
ADAGE CAPITAL PARTNERS GP, L.L.C. pharmaceutical preparations | 5.43M | 2.50% | 2.50% | $28.75B | Nov 14, 2025 | — held |
MORGAN STANLEY pharmaceutical preparations | 4.82M | 2.21% | 2.21% | $25.47B | May 27, 2026 | ▲ 1.32M |
CITADEL ADVISORS LLC pharmaceutical preparations | 2.58M | 1.18% | 1.18% | $13.63B | Nov 14, 2025 | ▲ 1.40M |
ALLY BRIDGE GROUP (NY) LLC pharmaceutical preparations | 2.29M | 1.05% | 1.05% | $12.10B | Nov 14, 2025 | NEW |
ARK INVESTMENT MANAGEMENT LLC pharmaceutical preparations | 2.02M | 92.81% | 92.81% | $10.68B | Nov 12, 2025 | NEW |
T. ROWE PRICE INVESTMENT MANAGEMENT, INC. pharmaceutical preparations | 1.94M | 89.15% | 89.15% | $10.26B | Nov 14, 2025 | NEW |
MILLENNIUM MANAGEMENT LLC pharmaceutical preparations | 1.10M | 50.45% | 50.45% | $5.81B | Nov 14, 2025 | ▼ 90.4K |
PALE FIRE CAPITAL SE pharmaceutical preparations | 1.08M | 49.67% | 49.67% | $5.72B | Nov 13, 2025 | ▼ 1.56M |
MARSHALL WACE, LLP pharmaceutical preparations | 1.07M | 48.98% | 48.98% | $5.64B | Nov 13, 2025 | ▲ 786.0K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+7.38M shares19
New Positions
first time holders5
Decreased
−1.89M shares0
Sold Out
fully exitedNet shares change (top 50)
+5.50M
+7.38M / −1.89M
Net new holders
+36
19 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
ATAI insider trading · insider activity
Source: SEC Form 4
10
Buy transactions
1
Sell transactions
10.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Feilding-Mellen Cosmo director | Nov 25, 2025 | Award | 10,000 | $4.48 | $44.8K | 10.0K | Form 4 ↗ |
Feilding-Mellen Cosmo director | Nov 25, 2025 | D-Return | 40,400 | $4.48 | $181.0K | 0 | Form 4 ↗ |
HERSHBERG ROBERT director | Nov 5, 2025 | Award | 456,011 | $1.35 | $615.6K | 456.0K | Form 4 ↗ |
HERSHBERG ROBERT director | Nov 5, 2025 | Award | 103,000 | $4.48 | $461.4K | 103.0K | Form 4 ↗ |
HERSHBERG ROBERT director | Nov 5, 2025 | Award | 97,716 | $1.35 | $131.9K | 97.7K | Form 4 ↗ |
HERSHBERG ROBERT director | Nov 5, 2025 | Award | 62,394 | $1.35 | $84.2K | 62.4K | Form 4 ↗ |
Feilding-Mellen Cosmo director | Nov 5, 2025 | Award | 7,702,990 | — | — | 7.70M | Form 4 ↗ |
Feilding-Mellen Cosmo director | Nov 5, 2025 | Award | 103,000 | $4.48 | $461.4K | 103.0K | Form 4 ↗ |
Feilding-Mellen Cosmo director | Nov 5, 2025 | Award | 40,400 | $4.48 | $181.0K | 40.4K | Form 4 ↗ |
Braunstein Scott director | Nov 4, 2025 | Award | 56,818 | $5.28 | $300.0K | 56.8K | 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
Atai Beckley Inc. (ATAI) is primarily owned by institutional investors, who hold approximately 11.9% of total shares outstanding. Company insiders own approximately 45.66%, while retail and public investors account for the remaining 42.48%.
The largest institutional shareholder of Atai Beckley Inc. is UBS GROUP AG, holding approximately 7.68 million shares — equal to 3.53% of outstanding shares — as of September 30, 2025.
A total of 138 institutional investors currently hold ATAI stock, with a combined institutional value of approximately $231,059,163 as of the most recent 13F filing period.
Frequently asked questions
ATAI ownershipAtai Beckley Inc. (ATAI) is primarily owned by institutional investors, who hold approximately 11.9% of shares. The largest shareholder is UBS GROUP AG with a 3.53% stake. Company insiders hold 45.66%. Data sourced from SEC Form 13F as of September 30, 2025.