Comparable stake leader
Janus Henderson Group Ltd.
SEC ownership of IDEAYA Biosciences, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001676725.
Disclosed value leader
FMR LLC
Comparable rows
50/50
Latest evidence
30 Jun 2026
- Public ticker
- IDYA on Nasdaq
- Parsed ownership sources
-
13D/G and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Janus Henderson Group Ltd.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Janus Henderson Group Ltd.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001676725
- Issuer location
- South San Francisco, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of IDEAYA Biosciences, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Janus Henderson Group Ltd.
Disclosed value leader
FMR LLC
Comparable rows
50/50
Latest evidence
30 Jun 2026
13D/G
13F
Lead comparable stake: 8.3%
13D/G row: Janus Henderson Group Ltd.
Showing 1-8 of 50 holder rows.
Quick read
Janus Henderson Group Ltd. leads the comparable SEC ownership view at 8.3%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Janus Henderson Group Ltd.'s linked filing trail.
Comparable ownership
Top 5
Janus Henderson Group Ltd.
8.3%
BlackRock, Inc.
8.1%
Capital Research Global Investors
6%
BAKER BROS. ADVISORS LP
5.2%
VANGUARD CAPITAL MANAGEMENT LLC
5.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Janus Henderson Group Ltd. |
13D/G
JANUS HENDERSON GROUP PLC
|
8.3%
|
$242,078,230
7,265,253 shares
|
+$27,885,974 | 31 Mar 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
8.1%
from 13D/G
|
$331,451,800
8,893,260 shares
|
— | 30 Jun 2026 |
| Capital Research Global Investors |
13F
13D/G
Company
|
6%
from 13D/G
|
$199,197,006
5,344,701 shares
|
— | 30 Jun 2026 |
| BAKER BROS. ADVISORS LP |
13F
13D/G
Company
|
5.2%
from 13D/G
|
$186,723,818
5,010,030 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.1%
|
$174,873,667
4,834,771 shares
|
$0 | 30 Jun 2026 |
| FEDERATED HERMES, INC. |
13D/G
13F
Company
|
3.9%
|
$117,393,162
3,395,771 shares
|
$0 | 31 Dec 2025 |
| Point72 Asset Management, L.P. |
13D/G
|
2.1%
|
$67,953,443
1,844,556 shares
|
-$94,600,552 | 31 Dec 2025 |
| FMR LLC |
13F
Company
|
15%
|
$525,858,476
14,109,431 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$1,265,759.
Buys
$1,647,890
Insiders: 1
Sells
$382,131
Insiders: 1
Net
+$1,265,759
Shares: +40,450
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 50,000
Shares: 9,550
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 9,550 | $0 | $382,131 | -$382,131 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 50,000 | 0 | $1,647,890 | $0 | +$1,647,890 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-19 of 19 reporting-owner rows connected to IDEAYA Biosciences, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
19
Largest Forms 3/4/5 holder
Yujiro S. Hata
Net 12M change
+$1,265,759
Latest report
07 Jul 2026
Recent insider transactions for IDEAYA Biosciences, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Andres Ruiz Briseno | IDYA | Common Stock | Sale | -26.5% | $382,131 | $40.01 | -9,550 | 26,466 | 07 Jul 2026 | Direct |
| Andres Ruiz Briseno | IDYA | Common Stock | Options Exercise | 36.1% | 9,550 | 36,016 | 07 Jul 2026 | Direct | ||
| Andres Ruiz Briseno | IDYA | Stock Option (Right to Buy) | Options Exercise | -33.2% | -9,550 | 19,200 | 07 Jul 2026 | Direct | ||
| Wendy L. Yarno | IDYA | Stock Option (right to buy) | Award | 20,000 | 20,000 | 16 Jun 2026 | Direct | |||
| Jeffrey Stein | IDYA | Stock Option (right to buy) | Award | 20,000 | 20,000 | 16 Jun 2026 | Direct | |||
| Terry J. Rosen | IDYA | Stock Option (right to buy) | Award | 20,000 | 20,000 | 16 Jun 2026 | Direct | |||
| Scott W. Morrison | IDYA | Stock Option (right to buy) | Award | 20,000 | 20,000 | 16 Jun 2026 | Direct | |||
| Catherine J. Mackey | IDYA | Stock Option (right to buy) | Award | 20,000 | 20,000 | 16 Jun 2026 | Direct | |||
| Malcolm Garret Hampton | IDYA | Stock Option (right to buy) | Award | 20,000 | 20,000 | 16 Jun 2026 | Direct | |||
| Jeffrey Stein | IDYA | Common Stock | Purchase | 1168% | $1,647,890 | $32.96 | 50,000 | 54,281 | 02 Mar 2026 | Direct |
| Joshua Bleharski | IDYA | Stock Option (right to buy) | Award | 170,000 | 170,000 | 30 Jan 2026 | Direct | |||
| Michael Anthony White | IDYA | Stock Option (right to buy) | Award | 190,000 | 190,000 | 30 Jan 2026 | Direct | |||
| Stuart Dorman | IDYA | Stock Option (right to buy) | Award | 155,000 | 155,000 | 30 Jan 2026 | Direct | |||
| Douglas B. Snyder | IDYA | Stock Option (right to buy) | Award | 130,000 | 130,000 | 30 Jan 2026 | Direct | |||
| Andres Ruiz Briseno | IDYA | Stock Option (right to buy) | Award | 80,000 | 80,000 | 30 Jan 2026 | Direct | |||
| Yujiro S. Hata | IDYA | Stock Option (right to buy) | Award | 600,000 | 600,000 | 30 Jan 2026 | Direct | |||
| Darrin Beaupre | IDYA | Stock Option (right to buy) | Award | 175,000 | 175,000 | 30 Jan 2026 | Direct | |||
| Douglas B. Snyder | IDYA | Common Stock | Award | 100.2% | 1,041 | 2,080 | 28 Nov 2025 | Direct | ||
| Andres Ruiz Briseno | IDYA | Common Stock | Award | 4.97% | 1,253 | 26,466 | 28 Nov 2025 | Direct |
* marks a reported price that did not pass the local price check.