IDEAYA Biosciences, Inc.
IDEAYA Biosciences, Inc. (IDYA) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IDYA · as of Sep 30, 2025
Ownership Breakdown
228
Institutional Holders
▲ 20 vs Q2
$2.56B
Total Inst. Value
▲ $524.68M vs Q2
87.86M
Shares Outstanding
freeFloat 99.04%
94.08M
13F Shares Held
▼ 2.74M 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
IDYA largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
FMR LLC pharmaceutical preparations | 13.15M | 14.86% | 14.86% | $357.72B | Nov 13, 2025 | ▲ 9.3K |
BLACKROCK, INC. pharmaceutical preparations | 8.13M | 9.19% | 9.19% | $221.14B | Nov 12, 2025 | ▼ 715.4K |
CAPITAL RESEARCH GLOBAL INVESTORS pharmaceutical preparations | 6.55M | 7.41% | 7.41% | $178.30B | Nov 13, 2025 | — held |
JANUS HENDERSON GROUP PLC pharmaceutical preparations | 6.43M | 7.27% | 7.27% | $174.93B | Nov 14, 2025 | ▲ 222.1K |
VANGUARD GROUP INC pharmaceutical preparations | 4.92M | 5.56% | 5.56% | $133.93B | Nov 7, 2025 | ▼ 19.7K |
FEDERATED HERMES, INC. pharmaceutical preparations | 4.63M | 5.23% | 5.23% | $125.87B | Nov 3, 2025 | ▼ 1.4K |
POINT72 ASSET MANAGEMENT, L.P. pharmaceutical preparations | 3.82M | 4.31% | 4.31% | $103.83B | Nov 14, 2025 | ▼ 1.21M |
BAKER BROS. ADVISORS LP pharmaceutical preparations | 3.28M | 3.70% | 3.70% | $89.12B | Nov 14, 2025 | ▲ 1.16M |
STATE STREET CORP pharmaceutical preparations | 3.24M | 3.66% | 3.66% | $88.19B | Nov 14, 2025 | ▼ 144.9K |
ADAGE CAPITAL PARTNERS GP, L.L.C. pharmaceutical preparations | 2.90M | 3.28% | 3.28% | $78.91B | Nov 14, 2025 | ▲ 1.66M |
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
+6.02M shares5
New Positions
first time holders22
Decreased
−9.06M shares0
Sold Out
fully exitedNet shares change (top 50)
3.04M
+6.02M / −9.06M
Net new holders
+5
5 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
IDYA insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
8
Buy transactions
0
Sell transactions
0.00
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 |
|---|---|---|---|---|---|---|---|
Stein Jeffrey director | Mar 2, 2026 | Purchase | 50,000 | $32.96 | $1.65M | 54.3K | Form 4 ↗ |
Bleharski Joshua Chief Financial Officer | Jan 30, 2026 | Award | 170,000 | $32.19 | $5.47M | 170.0K | Form 4 ↗ |
WHITE MICHAEL ANTHONY Chief Scientific Officer | Jan 30, 2026 | Award | 190,000 | $32.19 | $6.12M | 190.0K | Form 4 ↗ |
Beaupre Darrin Chief Medical Officer | Jan 30, 2026 | Award | 175,000 | $32.19 | $5.63M | 175.0K | Form 4 ↗ |
DORMAN STUART Chief Commercial Officer | Jan 30, 2026 | Award | 155,000 | $32.19 | $4.99M | 155.0K | Form 4 ↗ |
Hata Yujiro S President and CEO | Jan 30, 2026 | Award | 600,000 | $32.19 | $19.31M | 600.0K | Form 4 ↗ |
Snyder Douglas B. SVP, General Counsel | Jan 30, 2026 | Award | 130,000 | $32.19 | $4.18M | 130.0K | Form 4 ↗ |
Snyder Douglas B. SVP, General Counsel | Nov 28, 2025 | Award | 1,041 | $16.91 | $17.6K | 2.1K | Form 4 ↗ |
Snyder Douglas B. SVP, General Counsel | May 30, 2025 | Award | 1,039 | $16.91 | $17.6K | 1.0K | Form 4 ↗ |
Ruiz Briseno Andres See Remarks | Jan 30, 2026 | Award | 80,000 | $32.19 | $2.58M | 80.0K | 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
IDEAYA Biosciences, Inc. (IDYA) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 0.96%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of IDEAYA Biosciences, Inc. is FMR LLC, holding approximately 13.15 million shares — equal to 14.86% of outstanding shares — as of September 30, 2025.
A total of 228 institutional investors currently hold IDYA stock, with a combined institutional value of approximately $2.56 billion as of the most recent 13F filing period.
Frequently asked questions
IDYA ownershipIDEAYA Biosciences, Inc. (IDYA) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is FMR LLC with a 14.86% stake. Company insiders hold 0.96%. Data sourced from SEC Form 13F as of September 30, 2025.