IDEAYA Biosciences, Inc. (IDYA) Ownership
IDYA ownership summary
as of October 18, 2026- Institutions
- 107.8% of shares outstanding
- Insiders
- 2.19% of shares outstanding
- Shares outstanding
- 96.5M
- Float
- 90.6M shares available to trade
- Short interest
- 11.05% 9.2M shares short
- Days to cover
- 10.70 short interest down 7.5% vs prior month
- Institutions 107.78%
- Insiders 2.19%
IDYA top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | FMR Inc | 14.62% | 14.1M | $463.5M | +937,328 (+7.1%) | June 30, 2026 |
| 2 | BlackRock Inc | 9.22% | 8.9M | $292.1M | +451,127 (+5.3%) | June 30, 2026 |
| 3 | Jupiter Topco LLC | 8.89% | 8.6M | $281.8M | +8.6M (0.0%) | June 30, 2026 |
| 4 | HHG PLC | 7.53% | 7.3M | $238.7M | +78,797 (+1.1%) | March 31, 2026 |
| 5 | Capital Research Global Investors | 5.54% | 5.3M | $175.6M | +181,158 (+3.5%) | June 30, 2026 |
| 6 | Baker Bros Advisors LP | 5.19% | 5.0M | $164.6M | +1.1M (+26.9%) | June 30, 2026 |
| 7 | State Street Corp | 4.71% | 4.5M | $149.4M | +767,744 (+20.3%) | June 30, 2026 |
| 8 | Vanguard Capital Management, LLC | 4.28% | 4.1M | $135.8M | +400,224 (+10.7%) | June 30, 2026 |
| 9 | Logos Global Management LP | 3.11% | 3.0M | $98.5M | −450,000 (−13.0%) | June 30, 2026 |
| 10 | Adage Capital Partners Gp LLC | 2.81% | 2.7M | $89.2M | −108,109 (−3.8%) | June 30, 2026 |
| 11 | Deerfield Management Co | 2.81% | 2.7M | $89.2M | +1.2M (+77.4%) | June 30, 2026 |
| 12 | Geode Capital Management, LLC | 2.51% | 2.4M | $79.7M | −75,122 (−3.0%) | June 30, 2026 |
| 13 | T. Rowe Price Associates, Inc. | 2.29% | 2.2M | $72.5M | +891,582 (+67.8%) | June 30, 2026 |
| 14 | Morgan Stanley - Brokerage Accounts | 2.00% | 1.9M | $63.4M | +71,038 (+3.8%) | June 30, 2026 |
| 15 | Dimensional Fund Advisors, Inc. | 1.72% | 1.7M | $54.6M | +327,803 (+24.6%) | June 30, 2026 |
| 16 | AllianceBernstein L.P. | 1.69% | 1.6M | $53.5M | +1.5M (+1,514.8%) | June 30, 2026 |
| 17 | Fiera Capital Corporation | 1.50% | 1.4M | $47.5M | −1.1M (−42.8%) | June 30, 2026 |
| 18 | Federated Hermes Inc | 1.48% | 1.4M | $47.0M | −1.6M (−52.1%) | June 30, 2026 |
| 19 | GSK PLC | 1.38% | 1.3M | $43.8M | — | June 30, 2026 |
| 20 | BNP Paribas Investment Partners SA | 1.32% | 1.3M | $41.7M | +168,744 (+15.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 14 holders added 16.6M shares and 5 cut 3.3M.
IDYA top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | American Funds SMALLCAP World A | 5.39% | 5.2M | $170.9M | +518,518 (+11.1%) | June 30, 2026 |
| 2 | Fidelity Growth Company Fund | 4.90% | 4.7M | $155.4M | +16,800 (+0.4%) | August 31, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 3.08% | 3.0M | $97.7M | −5,284 (−0.2%) | August 31, 2026 |
| 4 | iShares Russell 2000 ETF | 2.42% | 2.3M | $76.8M | −26,944 (−1.1%) | September 30, 2026 |
| 5 | State Street® SPDR® S&P® Biotech ETF | 1.66% | 1.6M | $52.5M | −30,500 (−1.9%) | September 30, 2026 |
| 6 | Fidelity Growth Company K6 | 1.40% | 1.4M | $44.4M | +5,500 (+0.4%) | August 31, 2026 |
| 7 | Fidelity Series Growth Company | 1.14% | 1.1M | $36.2M | −37,500 (−3.3%) | August 31, 2026 |
| 8 | Janus Henderson Triton D | 1.11% | 1.1M | $35.3M | — | August 31, 2026 |
| 9 | Janus Henderson Hrzn Biotec E2 USD | 0.95% | 919K | $30.2M | +179,853 (+24.3%) | June 30, 2026 |
| 10 | Fidelity Small Cap Index | 0.95% | 917K | $30.1M | +7,762 (+0.9%) | July 31, 2026 |
| 11 | Federated Hermes Kaufmann R | 0.91% | 879K | $28.9M | −1.0M (−54.2%) | June 30, 2026 |
| 12 | Janus Henderson Global Life Sciences D | 0.80% | 770K | $25.3M | +12,671 (+1.7%) | August 31, 2026 |
| 13 | iShares Russell 2000 Value ETF | 0.79% | 764K | $25.1M | +1,158 (+0.2%) | September 30, 2026 |
| 14 | Janus Henderson Glb Life Scn I2 USD | 0.76% | 737K | $24.2M | +4,280 (+0.6%) | August 31, 2026 |
| 15 | Janus Global Life Science AUSD | 0.76% | 733K | $24.1M | +52,888 (+7.8%) | June 30, 2026 |
| 16 | T. Rowe Price Health Sciences | 0.75% | 727K | $23.9M | — | August 31, 2026 |
| 17 | iShares Biotechnology ETF | 0.73% | 708K | $23.2M | −5,360 (−0.8%) | September 30, 2026 |
| 18 | Janus Henderson Venture D | 0.70% | 675K | $22.2M | +2,396 (+0.4%) | August 31, 2026 |
| 19 | Fidelity Select Biotechnology | 0.66% | 638K | $21.0M | — | August 31, 2026 |
| 20 | BNP Paribas US Small Cap ClassicC | 0.64% | 619K | $20.3M | −1,186 (−0.2%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
IDYA insider transactions
latest 1| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-02 | Jeffrey Stein | Buy | $32.96 | 50,000 | $1.6M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
IDYA shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns IDYA
Institutional investors own 107.8% of IDEAYA Biosciences's shares and insiders 2.19%. The largest holder is FMR Inc with 14.62% of the shares (14.1M), as of June 30, 2026. Among the top 20 institutions, 14 added shares and 5 reduced their stake in the latest filings. Short interest is 11.05% of the float, or 10.70 days of average trading volume. The share count rose 8,758.3% since 2017.
Related: IDYA analyst forecast, IDYA key metrics. See the IDYA stock overview for the latest quote and news.
IDYA ownership FAQ
Who owns the most IDEAYA Biosciences stock?
The largest shareholders of IDEAYA Biosciences are FMR Inc (14.62%), BlackRock Inc (9.22%), Jupiter Topco LLC (8.89%), HHG PLC (7.53%), Capital Research Global Investors (5.54%).
What percentage of IDEAYA Biosciences is owned by institutions?
Institutions hold 107.8% of IDEAYA Biosciences's shares outstanding; insiders hold 2.19%.
Which funds own IDEAYA Biosciences?
The largest fund holders of IDEAYA Biosciences are American Funds SMALLCAP World A (5.39%), Fidelity Growth Company Fund (4.90%), Vanguard MStar Total Stk Mkt Idx Invest (3.08%), iShares Russell 2000 ETF (2.42%), State Street® SPDR® S&P® Biotech ETF (1.66%).
What is IDEAYA Biosciences's short interest?
9.2M shares of IDEAYA Biosciences were sold short, 11.05% of the float; at the average daily volume it would take 10.70 days to cover.
Are insiders buying or selling IDEAYA Biosciences?
Of the latest 1 reported insider transactions in IDEAYA Biosciences (since March 2, 2026), 1 were purchases and 0 were sales.
How many shares of IDEAYA Biosciences are outstanding?
IDEAYA Biosciences has 96.5M shares outstanding, of which 90.6M are in the public float.