Pubmatic, Inc.: which funds bought and sold

Institutions that bought and sold Pubmatic 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, 77 institutions that filed 13F reports for both quarters added to or opened positions in Pubmatic, and 63 cut or closed them. Together they added a net 1.6M shares, +5.7% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 380K shares (−4.1%); index fund managers were net buyers of 751K shares (+9.5%). 20 opened a new position and 17 sold out entirely.

Bought, Q2 2026 77 institutions, 20 of them new holders Sold, Q2 2026 63 institutions, 17 of them sold out

Net change, all compared +1.6M shares (+5.7%)

Net change, active managers −380K shares (−4.1%), 17 bought, 14 sold

Buyers versus sellers

institutions compared, 169

77 bought 29 63 sold

Active managers and hedge funds 17 bought · 14 sold · −380K

Index fund managers 8 bought · 1 sold · +751K

Other institutions 52 bought · 48 sold · +1.3M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Highbridge Capital Management LLC Hedge fund	+645K New position	645K	$8.4M
American Century Companies Inc Active manager	+530K +471.9%	642K	$8.4M
Whitefort Capital Management, LP	+421K +61.0%	1.1M	$14.6M
Nuveen, LLC	+381K +459.7%	464K	$6.1M
Vanguard Portfolio Management LLC Index funds	+309K +48.3%	948K	$12.4M
Citadel Advisors LLC Hedge fund	+266K +178.4%	415K	$5.4M
Dimensional Fund Advisors LP	+246K +19.7%	1.5M	$19.6M
Blackrock, Inc. Index funds	+214K +7.0%	3.3M	$43M
Simcoe Capital LLC	+208K +42.7%	694K	$9.1M
Boothbay Fund Management, LLC Hedge fund	+182K New position	182K	$2.4M
AQR Capital Management LLC Hedge fund	+161K +129.2%	286K	$3.8M
UBS Group AG	+107K +136.7%	186K	$2.4M
Two Sigma Investments, LP Hedge fund	+104K +19.4%	638K	$8.4M
Jump Financial, LLC	+101K New position	101K	$1.3M
Franklin Resources Inc Active manager	+85K +61.6%	223K	$2.9M
Bank Of America Corp	+79K +82.3%	174K	$2.3M
S Squared Technology, LLC	+72K +10.6%	748K	$9.8M
Walleye Capital LLC Hedge fund	+63K New position	63K	$831,047
State Street Corp Index funds	+63K +7.9%	854K	$11.2M
Northern Trust Corp Index funds	+58K +19.8%	348K	$4.6M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Highbridge Capital Management LLC Hedge fund	+645K New position	645K	$8.4M
American Century Companies Inc Active manager	+530K +471.9%	642K	$8.4M
Citadel Advisors LLC Hedge fund	+266K +178.4%	415K	$5.4M
Boothbay Fund Management, LLC Hedge fund	+182K New position	182K	$2.4M
AQR Capital Management LLC Hedge fund	+161K +129.2%	286K	$3.8M
Two Sigma Investments, LP Hedge fund	+104K +19.4%	638K	$8.4M
Franklin Resources Inc Active manager	+85K +61.6%	223K	$2.9M
Walleye Capital LLC Hedge fund	+63K New position	63K	$831,047
Point72 Asset Management, L.P. Hedge fund	+57K +255.8%	79K	$1M
Squarepoint Ops LLC Hedge fund	+39K +168.8%	62K	$815,237

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Centerbook Partners LP Hedge fund	−1.3M −76.2%	414K	$5.4M
D. E. Shaw & Co., Inc. Hedge fund	−401K −90.0%	44K	$581,478
Tudor Investment Corp Et Al Hedge fund	−351K Sold out	0	—
Royal Bank Of Canada	−121K −16.3%	619K	$8.1M
Renaissance Technologies LLC Hedge fund	−119K −7.8%	1.4M	$18.6M
Man Group PLC Hedge fund	−118K Sold out	0	—
Goldman Sachs Group Inc	−114K −32.1%	241K	$3.2M
Gsa Capital Partners LLP	−89K Sold out	0	—
Cardinal Point Capital Management Ulc	−72K Sold out	0	—
Jacobs Levy Equity Management, Inc Active manager	−69K −7.4%	863K	$11.3M
Morgan Stanley	−57K −16.8%	284K	$3.7M
Susquehanna International Group, LLP	−57K −23.7%	182K	$2.4M
Magnetar Financial LLC Hedge fund	−50K Sold out	0	—
Fox Run Management, L.L.C.	−47K Sold out	0	—
Brevan Howard Capital Management LP Hedge fund	−46K −80.4%	11K	$148,912
Trexquant Investment LP Hedge fund	−40K −9.4%	383K	$5M
Xtx Topco Ltd	−35K −51.1%	34K	$439,533
Mirae Asset Global Etfs Holdings Ltd.	−35K −28.9%	86K	$1.1M
HSBC Holdings PLC	−33K −36.5%	57K	$748,573
P.A.W. Capital Corp	−30K −16.7%	150K	$2M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Centerbook Partners LP Hedge fund	−1.3M −76.2%	414K	$5.4M
D. E. Shaw & Co., Inc. Hedge fund	−401K −90.0%	44K	$581,478
Tudor Investment Corp Et Al Hedge fund	−351K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−119K −7.8%	1.4M	$18.6M
Man Group PLC Hedge fund	−118K Sold out	0	—
Jacobs Levy Equity Management, Inc Active manager	−69K −7.4%	863K	$11.3M
Magnetar Financial LLC Hedge fund	−50K Sold out	0	—
Brevan Howard Capital Management LP Hedge fund	−46K −80.4%	11K	$148,912
Trexquant Investment LP Hedge fund	−40K −9.4%	383K	$5M
Balyasny Asset Management L.P. Hedge fund	−20K −53.4%	17K	$228,498

New positions

largest by value

Institution	Shares	Value June 30, 2026
Highbridge Capital Management LLCHedge fund	645K	$8.4M
Boothbay Fund Management, LLCHedge fund	182K	$2.4M
Jump Financial, LLC	101K	$1.3M
Walleye Capital LLCHedge fund	63K	$831,047
Inspire Investing, LLC	52K	$677,910
Raymond James Financial Inc	43K	$562,848
Cambria Investment Management, L.P.	23K	$299,503
Cornerstone Investment Partners, LLC	23K	$296,906
Caption Management, LLC	21K	$274,864
Ieq Capital, LLC	19K	$248,139

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Tudor Investment Corp Et AlHedge fund	351K	$2.9M
Man Group PLCHedge fund	118K	$963,031
Gsa Capital Partners LLP	89K	$728,000
Cardinal Point Capital Management Ulc	72K	$584,870
Magnetar Financial LLCHedge fund	50K	$409,213
Fox Run Management, L.L.C.	47K	$378,985
Leibman Financial Services, Inc.	16K	$133,301
Prelude Capital Management, LLC	12K	$101,023
M&T Bank Corp	10K	$82,569
Advisory Services Network, LLC	424	$3,468

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 152
Ten largest holders: 55.2%
Index fund managers: 28.6%
Active managers and hedge funds: 29.5%

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	17	14	5	3	−380K	−4.1%
Index fund managers	8	1	0	0	+751K	+9.5%
Other institutions	52	48	15	14	+1.3M	+11.1%

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 Pubmatic.

Only managers that filed a holdings report for both quarters are compared (169 here). 3 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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