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IDEAYA Biosciences, Inc.

IDYA Net buying
CIK 0001676725 #1584 in the set updated 17 Sep 2026
Bought (120 mo)
$24.37M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$34.91M
$719.03K on a plan · $22.05M straight out of an exercise
Sold at will
$12.14M
14 of 84 sales
Net
−$10.54M
+$12.23M against sales at will

By person

16 insiders · 119 transactions
39.4×

Yujiro S. Hata holds 39.4 times base salary in stock. $27.64M of shares against $700.00K in salary for 2025.

Salary from the company's own proxy. The shares are what Yujiro S. Hata last reported holding, valued at $40.01, the price Common Stock was last bought or sold at on the open market here, on 7 Jul 2026.

Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
Hata Yujiro S
President and CEO
—
$17.56M (14) scheduled
−$17.56M
690,695
0.7158%
$27.64M
+15.9%
CANAAN X L.P.
10% owner
$4.00M (1)
—
+$4.00M
2,660,713
2.76%
$106.46M
—
SHANNON TIMOTHY M
Director
$4.00M (1)
—
+$4.00M
2,660,713
2.76%
$106.46M
—
5AM Ventures IV, L.P. entity
10% owner
$7.50M (3)
$10.93M (3)
−$3.43M
384,496
0.3985%
$15.39M
—
DIEKMAN JOHN D
Director
$2.50M (2)
—
+$2.50M
118,521
0.1228%
$4.74M
—
Stone Paul A.
Chief Financial Officer
$2.50M (2)
$463.15K (9) scheduled
+$2.04M
127,824
0.1325%
$5.11M
—
Stein Jeffrey
Director
$1.65M (1)
—
+$1.65M
54,281
0.0563%
$2.17M
+1,168%
Throne Jason
Chief Legal Officer
—
$1.62M (19) scheduled
−$1.62M
63,484
0.0658%
$2.54M
+1,417%
Dillon Michael P.
SVP, Chief Scientific Officer
—
$1.50M (16) scheduled
−$1.50M
78,789
0.0817%
$3.15M
−13.5%
WHITE MICHAEL ANTHONY
Chief Scientific Officer
—
$1.03M (2) scheduled
−$1.03M
0
0.0000%
$0.00
—
BVF PARTNERS L P/IL entity
See Explanation of Responses
$1.72M (9)
$835.36K (3)
+$887.27K
233,150
0.2416%
$9.33M
+46.6%
Ruiz Briseno Andres
Chief Accounting Officer
—
$762.27K (7) scheduled
−$762.27K
26,466
0.0274%
$1.06M
−23.4%
Alexandria Venture Investments, LLC entity
10% owner
$500.00K (1)
—
+$500.00K
432,384
0.4481%
$17.30M
—
Lackner Mark
SVP, Head of Biology
—
$204.18K (11) scheduled
−$204.18K
0
0.0000%
$0.00
−100.0%
Hager Jeffrey
SVP, Chief Technology Officer
—
—
—
127,853
0.1325%
$5.12M
+19.6%
Snyder Douglas B.
SVP, General Counsel
—
—
—
2,080
0.0022%
$83.23K
—

Individual transactions

20
Insider
Date
Role
Action
Shares
Price
Amount
Stein Jeffrey
2 Mar 2026
Director
Buy
50,000
$32.96
$1.65M
BVF PARTNERS L P/IL
30 Jun 2020
10% owner
Buy
81
$13.32
$1.08K
BVF PARTNERS L P/IL
30 Jun 2020
10% owner
Buy
929
$13.32
$12.37K
BVF PARTNERS L P/IL
30 Jun 2020
10% owner
Buy
1,521
$13.32
$20.25K
BVF PARTNERS L P/IL
22 Jun 2020
10% owner
Buy
1,354
$13.93
$18.87K
BVF PARTNERS L P/IL
22 Jun 2020
10% owner
Buy
7,854
$13.93
$109.44K
BVF PARTNERS L P/IL
22 Jun 2020
10% owner
Buy
10,524
$13.93
$146.65K
BVF PARTNERS L P/IL
19 Jun 2020
10% owner
Buy
6,769
$14.39
$97.40K
BVF PARTNERS L P/IL
19 Jun 2020
10% owner
Buy
39,052
$14.39
$561.94K
BVF PARTNERS L P/IL
19 Jun 2020
10% owner
Buy
52,443
$14.39
$754.63K
CANAAN X L.P.
28 May 2019
10% owner
Buy
400,000
$10.00
$4.00M
SHANNON TIMOTHY M
28 May 2019
Director
Buy indirect
400,000
$10.00
$4.00M
5AM Ventures IV, L.P.
28 May 2019
10% owner
Buy indirect
500,000
$10.00
$5.00M
5AM Ventures IV, L.P.
28 May 2019
10% owner
Buy indirect
10,000
$10.00
$100.00K
5AM Ventures IV, L.P.
28 May 2019
10% owner
Buy indirect
240,000
$10.00
$2.40M
Stone Paul A.
28 May 2019
SVP, General Counsel
Buy indirect
10,000
$10.00
$100.00K
Stone Paul A.
28 May 2019
SVP, General Counsel
Buy indirect
240,000
$10.00
$2.40M
DIEKMAN JOHN D
28 May 2019
Director
Buy indirect
10,000
$10.00
$100.00K
DIEKMAN JOHN D
28 May 2019
Director
Buy indirect
240,000
$10.00
$2.40M
Alexandria Venture Investments, LLC
28 May 2019
10% owner
Buy
50,000
$10.00
$500.00K
Show all 119 transactions →

What was left out

Form 4 filings counted 166
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 6
Sales on a Rule 10b5-1 plan 12
Sales straight out of an exercise 58
Sales at will 14
Transactions with no price 0
Shares from compensation/vesting 12,886,121
Sales filed before the plan box existed 14
History held since 28 May 2019