Ideaya Biosciences Inc
Ownership
Ownership Structure
Who owns Ideaya Biosciences Inc (IDYA)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 93.9% of the shares are freely tradable; institutional investors hold 101.8%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| FMR Inc | 13.65 | 13,172,103 | +0.2 | 03/31/2026 |
| BlackRock Inc | 8.75 | 8,442,133 | +2.8 | 03/31/2026 |
| HHG PLC | 7.53 | 7,265,253 | +1.1 | 03/31/2026 |
| Capital Research Global Investors | 5.54 | 5,344,701 | +3.5 | 06/30/2026 |
| Baker Bros Advisors LP | 4.09 | 3,946,515 | +9.1 | 03/31/2026 |
| State Street Corp | 3.92 | 3,781,167 | -8.5 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.87 | 3,732,422 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Fidelity Growth Compy Commingled Pl S | 6.54 | 6,311,825 | +0.5 | 07/31/2026 |
| American Funds SMALLCAP World A | 5.39 | 5,202,950 | +11.1 | 06/30/2026 |
| Fidelity Growth Company Fund | 4.88 | 4,713,396 | +2.4 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Ruiz Briseno Andres | Chief Accounting Officer | 26,466 | 1,021,588 $ | Jul 7, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jul 7, 2026 | Ruiz Briseno Andres | Chief Accounting Officer | Sell | 9,550 | 40.01 | 382,131 |
| Jul 7, 2026 | Ruiz Briseno Andres | Chief Accounting Officer | Other | 9,550 | 12.86 | 122,813 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.