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 | 14.62 | 14,109,431 | +7.1 | 06/30/2026 |
| BlackRock Inc | 9.22 | 8,893,260 | +5.3 | 06/30/2026 |
| Jupiter Topco LLC | 8.89 | 8,579,881 | +0.0 | 06/30/2026 |
| 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 | 5.19 | 5,010,030 | +26.9 | 06/30/2026 |
| State Street Corp | 4.71 | 4,548,911 | +20.3 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.28 | 4,132,646 | +10.7 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| American Funds SMALLCAP World A | 5.39 | 5,202,950 | +0.0 | 09/30/2026 |
| Fidelity Growth Company Fund | 4.90 | 4,730,196 | +0.4 | 08/31/2026 |
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 |
|---|---|---|---|---|---|
| Hata Yujiro S | President and CEO | 690,695 | 22,102,240 $ | Oct 6, 2026 | direct |
| Ruiz Briseno Andres | Chief Accounting Officer | 26,466 | 846,912 $ | 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 |
|---|---|---|---|---|---|---|
| Oct 6, 2026 | Hata Yujiro S | President and CEO | Sell | 800 | 38.26 | 30,610 |
| Oct 6, 2026 | Hata Yujiro S | President and CEO | Sell | 25,538 | 37.39 | 954,787 |
| Oct 6, 2026 | Hata Yujiro S | President and CEO | Other | 26,338 | 4.31 | 113,517 |
| 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: October 30, 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.