Ideaya Biosciences, Inc.: which funds bought and sold

Institutions that bought and sold Ideaya Biosciences shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 152 institutions that filed 13F reports for both quarters added to or opened positions in Ideaya Biosciences, and 121 cut or closed them. Together they added a net 6.2M shares, +7.1% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 4.8M shares (+11.9%); index fund managers were net buyers of 1.8M shares (+8.3%). 61 opened a new position and 32 sold out entirely.

Bought, Q2 2026 152 institutions, 61 of them new holders Sold, Q2 2026 121 institutions, 32 of them sold out

Net change, all compared +6.2M shares (+7.1%)

Net change, active managers +4.8M shares (+11.9%), 29 bought, 24 sold

Buyers versus sellers

institutions compared, 309

152 bought 36 121 sold

Active managers and hedge funds 29 bought · 24 sold · +4.8M

Index fund managers 9 bought · 3 sold · +1.8M

Other institutions 114 bought · 94 sold · −356K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Alliancebernstein L.P. Active manager	+1.5M +1514.8%	1.6M	$54.2M
Deerfield Management Company, L.P. Hedge fund	+1.2M +77.4%	2.7M	$101M
Baker Bros. Advisors LP Hedge fund	+1.1M +26.9%	5.0M	$187M
FMR LLC Active manager	+937K +7.1%	14.1M	$526M
Arrowstreet Capital, Limited Partnership Hedge fund	+892K New position	892K	$33.2M
Price T Rowe Associates Inc Active manager	+892K +67.8%	2.2M	$82.3M
State Street Corp Index funds	+768K +20.3%	4.5M	$170M
Sio Capital Management, LLC	+480K New position	480K	$17.9M
Blackrock, Inc. Index funds	+451K +5.3%	8.9M	$331M
Vanguard Capital Management LLC Index funds	+400K +10.7%	4.1M	$154M
Affinity Asset Advisors, LLC	+400K New position	400K	$14.9M
Walleye Capital LLC Hedge fund	+386K New position	386K	$14.4M
RTW Investments, LP Hedge fund	+370K New position	370K	$13.8M
Dimensional Fund Advisors LP	+328K +24.6%	1.7M	$61.9M
Bit Capital Gmbh	+311K New position	311K	$11.6M
First Trust Advisors LP	+260K +557.0%	307K	$11.4M
Burkehill Global Management, LP Hedge fund	+200K New position	200K	$7.5M
Sphera Funds Management Ltd.	+196K New position	196K	$7.3M
Nuveen, LLC	+192K +42.8%	640K	$23.9M
Verition Fund Management LLC Hedge fund	+184K New position	184K	$6.9M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Alliancebernstein L.P. Active manager	+1.5M +1514.8%	1.6M	$54.2M
Deerfield Management Company, L.P. Hedge fund	+1.2M +77.4%	2.7M	$101M
Baker Bros. Advisors LP Hedge fund	+1.1M +26.9%	5.0M	$187M
FMR LLC Active manager	+937K +7.1%	14.1M	$526M
Arrowstreet Capital, Limited Partnership Hedge fund	+892K New position	892K	$33.2M
Price T Rowe Associates Inc Active manager	+892K +67.8%	2.2M	$82.3M
Walleye Capital LLC Hedge fund	+386K New position	386K	$14.4M
RTW Investments, LP Hedge fund	+370K New position	370K	$13.8M
Burkehill Global Management, LP Hedge fund	+200K New position	200K	$7.5M
Verition Fund Management LLC Hedge fund	+184K New position	184K	$6.9M

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Federated Hermes, Inc. Active manager	−1.6M −52.1%	1.4M	$53.4M
Fiera Capital Corp	−1.1M −42.8%	1.4M	$53.9M
First Turn Management, LLC	−874K Sold out	0	—
Ensign Peak Advisors, Inc	−632K −70.3%	267K	$10M
Logos Global Management LP Hedge fund	−450K −13.0%	3.0M	$112M
Goldman Sachs Group Inc	−424K −25.6%	1.2M	$45.9M
Citadel Advisors LLC Hedge fund	−379K −55.8%	300K	$11.2M
Point72 Asset Management, L.P. Hedge fund	−328K Sold out	0	—
Deutsche Bank Ag\	−285K −75.2%	94K	$3.5M
Nicholas Investment Partners, LP	−248K Sold out	0	—
Millennium Management LLC Hedge fund	−218K −95.4%	11K	$391,335
Sofinnova Investments, Inc.	−207K −18.3%	925K	$34.5M
Alyeska Investment Group, L.P. Hedge fund	−192K Sold out	0	—
Neuberger Berman Group LLC Active manager	−121K Sold out	0	—
Adage Capital Partners Gp, L.L.C. Hedge fund	−108K −3.8%	2.7M	$101M
UBS Group AG	−106K −13.9%	657K	$24.5M
Jane Street Group, LLC	−88K Sold out	0	—
Connor, Clark & Lunn Investment Management Ltd.	−87K −49.2%	90K	$3.4M
Russell Investments Group, Ltd.	−84K −62.0%	51K	$1.9M
Two Sigma Investments, LP Hedge fund	−78K −65.4%	41K	$1.5M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Federated Hermes, Inc. Active manager	−1.6M −52.1%	1.4M	$53.4M
Logos Global Management LP Hedge fund	−450K −13.0%	3.0M	$112M
Citadel Advisors LLC Hedge fund	−379K −55.8%	300K	$11.2M
Point72 Asset Management, L.P. Hedge fund	−328K Sold out	0	—
Millennium Management LLC Hedge fund	−218K −95.4%	11K	$391,335
Alyeska Investment Group, L.P. Hedge fund	−192K Sold out	0	—
Neuberger Berman Group LLC Active manager	−121K Sold out	0	—
Adage Capital Partners Gp, L.L.C. Hedge fund	−108K −3.8%	2.7M	$101M
Two Sigma Investments, LP Hedge fund	−78K −65.4%	41K	$1.5M
Squarepoint Ops LLC Hedge fund	−74K −74.6%	25K	$939,875

New positions

largest by value

Institution	Shares	Value June 30, 2026
Arrowstreet Capital, Limited PartnershipHedge fund	892K	$33.2M
Sio Capital Management, LLC	480K	$17.9M
Affinity Asset Advisors, LLC	400K	$14.9M
Walleye Capital LLCHedge fund	386K	$14.4M
RTW Investments, LPHedge fund	370K	$13.8M
Bit Capital Gmbh	311K	$11.6M
Burkehill Global Management, LPHedge fund	200K	$7.5M
Sphera Funds Management Ltd.	196K	$7.3M
Verition Fund Management LLCHedge fund	184K	$6.9M
Rheos Capital Works Inc.	150K	$5.6M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
First Turn Management, LLC	874K	$29.1M
Point72 Asset Management, L.P.Hedge fund	328K	$10.9M
Nicholas Investment Partners, LP	248K	$8.3M
Alyeska Investment Group, L.P.Hedge fund	192K	$6.4M
Neuberger Berman Group LLCActive manager	121K	$4M
Jane Street Group, LLC	88K	$2.9M
Y-Intercept (Hong Kong) Ltd	55K	$1.8M
Acuta Capital Partners, LLC	48K	$1.6M
Boothbay Fund Management, LLCHedge fund	28K	$924,730
Ishara Investments LP	25K	$819,672

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 282
Ten largest holders: 57.7%
Index fund managers: 22.7%
Active managers and hedge funds: 44.3%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	29	24	14	9	+4.8M	+11.9%
Index fund managers	9	3	0	0	+1.8M	+8.3%
Other institutions	114	94	47	23	−356K	−1.4%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Ideaya Biosciences.

Only managers that filed a holdings report for both quarters are compared (309 here). 9 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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