IDEAYA Biosciences, Inc. (IDYA) has 20 known insider and institutional holders on record. The largest holder is Hata Yujiro S with 600,000 shares. Other notable holders include BVF PARTNERS L P/IL and WHITE MICHAEL ANTHONY.
Over the last 12 months, insiders have made 19 transactions in IDYA stock — 18 buys (valued at $52.62M) and 0 sells (valued at RSU Award). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
IDYA Insider Ownership
Top Holder
Hata Yujiro S
600,000 shares
Buys (12 mo)
18
$52.62M value
Sells (12 mo)
0
$0.00 value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Hata Yujiro S |
President and CEO |
600,000 |
2026-02-02 |
|
| 2 |
Bvf Partners L P/il |
Officer |
233,150 |
2021-02-04 |
|
| 3 |
White Michael Anthony |
Chief Scientific Officer |
190,000 |
2026-02-02 |
|
| 4 |
Beaupre Darrin |
Chief Medical Officer |
175,000 |
2026-02-02 |
|
| 5 |
Bleharski Joshua |
Chief Financial Officer |
170,000 |
2026-02-02 |
|
| 6 |
Dorman Stuart |
Chief Commercial Officer |
155,000 |
2026-02-02 |
|
| 7 |
5am Ventures Iv, L.p. |
10 Percent Owner |
91,142 |
2020-11-13 |
|
| 8 |
Hambleton Julie |
SVP, Chief Medical Officer |
62,500 |
2020-02-25 |
|
| 9 |
Stein Jeffrey |
Director |
54,281 |
2026-03-02 |
|
| 10 |
Lackner Mark |
SVP, Head of Biology |
45,000 |
2021-02-26 |
|
| 11 |
Ruiz Briseno Andres |
See Remarks |
25,213 |
2026-02-02 |
|
| 12 |
Dillon Michael P. |
SVP, Chief Scientific Officer |
23,437 |
2021-10-07 |
|
| 13 |
Morrison Scott W |
Director |
20,000 |
2025-06-26 |
|
| 14 |
Mackey Catherine J |
Director |
20,000 |
2025-06-26 |
|
| 15 |
Rosen Terry J |
Director |
20,000 |
2025-06-26 |
|
| 16 |
Yarno Wendy L |
Director |
20,000 |
2025-06-26 |
|
| 17 |
Hampton Malcolm Garret |
Director |
20,000 |
2025-06-26 |
|
| 18 |
Kelley Susan L. |
Director |
16,200 |
2024-05-31 |
|
| 19 |
Shannon Timothy M |
Director |
16,200 |
2023-06-09 |
|
| 20 |
Diekman John D |
Director |
11,000 |
2019-12-19 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-02 |
Stein Jeffrey |
Director |
Informative Buy |
50,000 |
$32.96 |
$1.65M |
| 2026-01-30 |
Bleharski Joshua |
Chief Financial Officer |
RSU Award |
170,000 |
$32.19 |
$5.47M |
| 2026-01-30 |
Dorman Stuart |
Chief Commercial Officer |
RSU Award |
155,000 |
$32.19 |
$4.99M |
| 2026-01-30 |
Ruiz Briseno Andres |
See Remarks |
RSU Award |
80,000 |
$32.19 |
$2.58M |
| 2025-11-28 |
Ruiz Briseno Andres |
See Remarks |
RSU Award |
1,253 |
$16.91 |
$21.18K |
| 2024-11-29 |
Ruiz Briseno Andres |
See Remarks |
RSU Award |
682 |
$23.26 |
$15.86K |
| 2026-01-30 |
White Michael Anthony |
Chief Scientific Officer |
RSU Award |
190,000 |
$32.19 |
$6.12M |
| 2026-01-30 |
Snyder Douglas B. |
SVP, General Counsel |
RSU Award |
130,000 |
$32.19 |
$4.18M |
| 2025-11-28 |
Snyder Douglas B. |
SVP, General Counsel |
RSU Award |
1,041 |
$16.91 |
$17.6K |
| 2025-05-30 |
Snyder Douglas B. |
SVP, General Counsel |
RSU Award |
1,039 |
$16.91 |
$17.57K |
| 2026-01-30 |
Hata Yujiro S |
President and CEO |
RSU Award |
600,000 |
$32.19 |
$19.31M |
| 2026-01-30 |
Beaupre Darrin |
Chief Medical Officer |
RSU Award |
175,000 |
$32.19 |
$5.63M |
| 2025-06-27 |
Bleharski Joshua |
Chief Financial Officer |
Unknown |
250,000 |
$20.05 |
$5.01M |
| 2025-06-24 |
Hampton Malcolm Garret |
Director |
RSU Award |
20,000 |
$21.78 |
$435.6K |
| 2025-06-24 |
Morrison Scott W |
Director |
RSU Award |
20,000 |
$21.78 |
$435.6K |
| 2025-06-24 |
Mackey Catherine J |
Director |
RSU Award |
20,000 |
$21.78 |
$435.6K |
| 2025-06-24 |
Stein Jeffrey |
Director |
RSU Award |
20,000 |
$21.78 |
$435.6K |
| 2025-06-24 |
Rosen Terry J |
Director |
RSU Award |
20,000 |
$21.78 |
$435.6K |
| 2025-06-24 |
Yarno Wendy L |
Director |
RSU Award |
20,000 |
$21.78 |
$435.6K |
