IDYA · Insider trading · 13F holders · Congress trades
IDEAYA Biosciences, Inc. (IDYA)
Who is buying and selling IDYA: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 21
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $985K
- Congress trades, 12 months
- 0
IDYA at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 1 IDYA insider filed 1 sale worth $985K on SEC Form 4, and no open-market purchases; 1 of the sales were pre-planned under Rule 10b5-1.
- 21 13F filers hold IDYA among their 50 largest positions, worth $639.8M combined, including James Flynn and Julian and Felix Baker. The biggest bets by portfolio weight are GSK plc (8.3%), Logos Global Management LP (4.8%) and DAFNA Capital Management LLC (3.5%). In their latest 13Fs, 1 manager opened a new position and 7 added to one.
- No member of Congress has disclosed a trade in IDYA.
- IDYA last closed at $32.89 on Oct 29, 2026.
IDYA insider trading
Between Aug 1, 2026 and Oct 29, 2026, 1 IDYA insider filed 1 sale worth $985K on SEC Form 4, and no open-market purchases; 1 of the sales were pre-planned under Rule 10b5-1.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 8, 2026 | Hata Yujiro S | President and CEO, Director | Sale10b5-1 | 26,338 | $37.41 | $985K | SEC |
Who owns IDYA? Hedge funds and superinvestors
21 13F filers hold IDYA among their 50 largest positions, worth $639.8M combined, including James Flynn and Julian and Felix Baker. The biggest bets by portfolio weight are GSK plc (8.3%), Logos Global Management LP (4.8%) and DAFNA Capital Management LLC (3.5%). In their latest 13Fs, 1 manager opened a new position and 7 added to one.
Superinvestors holding IDYA: James Flynn 1.3% · Julian and Felix Baker 0.9%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Julian and Felix BakerHedge fund | 0.9% | $186.7M | 5,010,030 | +26.9% shares | Q2 2026 |
| Logos Global Management LPHedge fund | 4.8% | $111.8M | 3,000,000 | -13.0% shares | Q2 2026 |
| James FlynnHedge fund | 1.3% | $101.2M | 2,714,503 | +77.4% shares | Q2 2026 |
| GSK plcCorporation | 8.3% | $49.7M | 1,333,333 | +0.0% shares | Q2 2026 |
| Sofinnova Investments, Inc.Hedge fund | 1.8% | $34.5M | 925,119 | -18.3% shares | Q2 2026 |
| Redmile Group, LLCHedge fund | 1.6% | $23.9M | 640,202 | +22.9% shares | Q2 2026 |
| DAFNA Capital Management LLCHedge fund | 3.5% | $18.5M | 497,240 | +4.3% shares | Q2 2026 |
| Sio Capital Management, LLCHedge fund | 3.1% | $17.9M | 480,383 | — | Q2 2026 |
| Tang Capital Management LLCHedge fund | 0.8% | $16.8M | 450,000 | +0.0% shares | Q2 2026 |
| Affinity Asset Advisors, LLCHedge fund | 0.7% | $14.9M | 400,000 | — | Q2 2026 |
| Rhenman & Partners Asset Management ABHedge fund | 1.2% | $12.8M | 343,800 | +34.6% shares | Q2 2026 |
| BIT Capital GmbHAsset manager | 0.4% | $11.6M | 311,333 | — | Q2 2026 |
| General American Investors Co IncCorporation | 0.7% | $11.5M | 308,240 | +10.0% shares | Q2 2026 |
| Sphera Funds Management Ltd.Hedge fund | 1.0% | $7.3M | 196,408 | — | Q2 2026 |
| Platinum Investment Management LtdAsset manager | 1.3% | $5.2M | 138,708 | +51.4% shares | Q2 2026 |
| Odyssean, LLCAsset manager | 0.6% | $3.8M | 102,582 | — | Q2 2026 |
| Atle Fund Management ABAsset manager | 0.9% | $3.5M | 94,478 | +203.5% shares | Q2 2026 |
| KVP Capital Advisors, LPHedge fund | 2.2% | $3.0M | 79,700 | +0.0% shares | Q2 2026 |
| Ally Bridge Group (NY) LLCHedge fund | 3.2% | $2.5M | 67,500 | New | Q2 2026 |
| Seven Fleet Capital Management LPHedge fund | 0.2% | $1.4M | 37,865 | -56.1% shares | Q2 2026 |
| Flax Pond Capital, LLCWealth manager | 1.1% | $1.3M | 40,442 | +3.1% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 21). Screen IDYA in the grand portfolio →
IDYA stock trades by members of Congress
No member of Congress has disclosed a trade in IDYA.
IDYA questions and answers
Are insiders buying IDYA stock?
Between Aug 1, 2026 and Oct 29, 2026, 1 IDYA insider filed 1 sale worth $985K on SEC Form 4, and no open-market purchases; 1 of the sales were pre-planned under Rule 10b5-1.
Which hedge funds own IDYA?
21 13F filers hold IDYA among their 50 largest positions, worth $639.8M combined, including James Flynn and Julian and Felix Baker. The biggest bets by portfolio weight are GSK plc (8.3%), Logos Global Management LP (4.8%) and DAFNA Capital Management LLC (3.5%). In their latest 13Fs, 1 manager opened a new position and 7 added to one.
Has Congress traded IDYA?
No member of Congress has disclosed a trade in IDYA.
Who is the largest holder of IDYA?
Among 13F filers, Julian and Felix Baker reports the largest IDYA position, $186.7M (5,010,030 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is GSK plc's: 8.3% of its portfolio.
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