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Equibles

PUBM

PubMatic, Inc.

Company with tickers: PUBM

CIK
1422930
CUSIP
74467Q103
Shares Outstanding
38,180,751
13F Activity (30d)
102 filings 99 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 154
Total Value: $251,225,395
Total Shares: 30,712,163
Showing 1–100 of 162 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 154 13F filers · Δ vs Dec 31, 2025
Top Holder
11.1%
Jun 2023 → Mar 2026 · range 10.9% – 20.2%
+0.2 pts
Top 5
37.1%
Jun 2023 → Mar 2026 · range 37.1% – 56.2%
−0.5 pts
Top 10
55.6%
Jun 2023 → Mar 2026 · range 55.3% – 73.2%
+0.2 pts
HHI
437
Jun 2023 → Mar 2026 · range 437 – 880
Broadly held−6

Quarterly Activity

vs Dec 31, 2025
New
34
Increased
59
Decreased
41
Sold Out
33
Unchanged
20
Holder count: +1
Institutional value: -1.6%
Shares held: +6.7%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Large Walleye Trading LLC +661,203 714,183
Large ACADIAN ASSET MANAGEMENT LLC +650,169 1,576,540
Mid CenterBook Partners LP +595,045 1,742,100
Small Graham Holdings Co +567,442 3,398,904
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP +480,991 999,384

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega MILLENNIUM MANAGEMENT LLC −826,104 92,023
Large Point72 Asset Management, L.P. −136,611 22,303
Mega ROYAL BANK OF CANADA −122,907 740,281
Mega CITADEL ADVISORS LLC −113,400 481,743
Mega D. E. Shaw & Co., Inc. −101,379 445,114

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 1,613,769 $13,200,630
Small Whitefort Capital Management, LP 690,000 $5,644,200
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 638,785 $5,225,261
Mega VANGUARD FIDUCIARY TRUST CO 230,629 $1,886,545
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 206,287 $1,687,427

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 2,379,185 $21,103,369
Mega WELLINGTON MANAGEMENT GROUP LLP 1,170,952 $10,386,343
Mid ALGERT GLOBAL LLC 314,634 $2,790,803
Large PEAK6 LLC 314,400 $2,788,728
Large TWO SIGMA ADVISERS, LP 182,600 $1,619,662
Filter: New 34 Increased 59 Reduced 41 Sold out 33 Unchanged 20
Showing 100 of 162
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Small Graham Holdings Co $27,803,034 11.07% 3,398,904
Mega BlackRock, Inc. $25,071,989 9.98% 3,065,036
Mid CenterBook Partners LP $14,250,378 5.67% 1,742,100
Mega VANGUARD CAPITAL MANAGEMENT LLC $13,200,630 5.25% 1,613,769
Large ACADIAN ASSET MANAGEMENT LLC $12,896,097 5.13% 1,576,540
Large RENAISSANCE TECHNOLOGIES LLC $12,601,559 5.02% 1,540,533
Mega DIMENSIONAL FUND ADVISORS LP $10,187,034 4.05% 1,245,359
Mega GEODE CAPITAL MANAGEMENT, LLC $7,775,948 3.10% 950,605
Large JACOBS LEVY EQUITY MANAGEMENT, INC $7,625,502 3.04% 932,213
Mega STATE STREET CORP $6,473,807 2.58% 791,419
Mega ROYAL BANK OF CANADA Bank $6,055,496 2.41% 740,281
Small Whitefort Capital Management, LP $5,644,200 2.25% 690,000
Small S SQUARED TECHNOLOGY, LLC $5,532,943 2.20% 676,399
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $5,362,808 2.13% 655,600
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $5,225,261 2.08% 638,785
Large Walleye Trading LLC $4,671,598 1.86% 571,100
Mega TWO SIGMA INVESTMENTS, LP $4,371,792 1.74% 534,449
Small Simcoe Capital LLC $3,977,541 1.58% 486,252
Mega D. E. Shaw & Co., Inc. $3,641,032 1.45% 445,114
Large Trexquant Investment LP $3,455,420 1.38% 422,423
Mega GOLDMAN SACHS GROUP INC $2,897,355 1.15% 354,200
Large TUDOR INVESTMENT CORP ET AL $2,872,096 1.14% 351,112
Mega MORGAN STANLEY $2,794,857 1.11% 341,670
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $2,411,488 0.96% 294,803
Mega NORTHERN TRUST CORP Bank $2,376,788 0.95% 290,561
Large PANAGORA ASSET MANAGEMENT INC $2,259,774 0.90% 276,256
Mega JPMORGAN CHASE & CO $1,967,019 0.78% 240,467
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,954,889 0.78% 238,984
Mega CITADEL ADVISORS LLC $1,895,306 0.75% 231,700
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,886,545 0.75% 230,629
Mega JANE STREET GROUP, LLC $1,717,799 0.68% 210,000
Large Quantinno Capital Management LP $1,691,746 0.67% 206,815
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $1,687,427 0.67% 206,287
Micro P.A.W. CAPITAL CORP $1,472,400 0.59% 180,000
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $1,433,954 0.57% 175,300
Small Pinnacle Holdings, LLC $1,291,491 0.51% 157,884
Mega CITADEL ADVISORS LLC $1,219,170 0.49% 149,043
Small Diversified Investment Strategies, LLC $1,145,200 0.46% 140,000
Mega FRANKLIN RESOURCES INC $1,130,311 0.45% 138,180
Mega AMERIPRISE FINANCIAL INC $1,096,128 0.44% 134,001
Large Walleye Trading LLC $1,063,400 0.42% 130,000
Mega AQR CAPITAL MANAGEMENT LLC $1,022,121 0.41% 124,954
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $987,751 0.39% 120,752
Mega Invesco Ltd. $963,325 0.38% 117,766
Large Man Group plc $963,031 0.38% 117,730
Mega Bank of New York Mellon Corp Bank $926,866 0.37% 113,309
Mega AMERICAN CENTURY COMPANIES INC $918,384 0.37% 112,272
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $857,264 0.34% 104,800
Mega CITADEL ADVISORS LLC $826,180 0.33% 101,000
Mega BANK OF AMERICA CORP /DE/ Bank $780,617 0.31% 95,430
Mega MILLENNIUM MANAGEMENT LLC $752,748 0.30% 92,023
Mega HSBC HOLDINGS PLC $738,809 0.29% 90,319
Mid GSA CAPITAL PARTNERS LLP $728,437 0.29% 89,051
Mega Nuveen, LLC $678,391 0.27% 82,933
Mega DEUTSCHE BANK AG\ Bank $671,267 0.27% 82,062
Mega UBS Group AG $642,783 0.26% 78,580
Mega VICTORY CAPITAL MANAGEMENT INC $631,757 0.25% 77,232
Mega BARCLAYS PLC $629,090 0.25% 76,906
Small Cardinal Point Capital Management ULC $584,870 0.23% 71,500
Mid XTX Topco Ltd $559,986 0.22% 68,458
Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Pension $543,364 0.22% 66,426
Large Russell Investments Group, Ltd. $542,255 0.22% 66,291
Mid GROUP ONE TRADING LLC $522,186 0.21% 63,837
Mega WELLS FARGO & COMPANY/MN $496,909 0.20% 60,747
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $485,892 0.19% 59,400
Mid Brevan Howard Capital Management LP $472,853 0.19% 57,806
Small Avestar Capital, LLC $449,900 0.18% 55,000
Large VOYA INVESTMENT MANAGEMENT LLC $436,254 0.17% 53,332
Mid Magnetar Financial LLC $409,212 0.16% 50,026
Mega RHUMBLINE ADVISERS $406,979 0.16% 49,753
Large Creative Planning $394,676 0.16% 48,249
Small FOX RUN MANAGEMENT, L.L.C. $381,785 0.15% 46,673
Mega JANE STREET GROUP, LLC $323,110 0.13% 39,500
Large Balyasny Asset Management L.P. $305,972 0.12% 37,405
Mid IMC-Chicago, LLC $301,367 0.12% 36,842
Large FULLER & THALER ASSET MANAGEMENT, INC. $300,500 0.12% 36,736
Mega JANE STREET GROUP, LLC $299,388 0.12% 36,600
Mega ALLIANCEBERNSTEIN L.P. $296,116 0.12% 36,200
Large STRS OHIO $254,398 0.10% 31,100
Mega PRICE T ROWE ASSOCIATES INC /MD/ $252,974 0.10% 30,926
Large LOS ANGELES CAPITAL MANAGEMENT LLC $226,651 0.09% 27,708
Mid Allworth Financial LP $205,874 0.08% 25,168
Small GWN SECURITIES INC. Broker-Dealer $201,571 0.08% 24,642
Large MetLife Investment Management, LLC $200,442 0.08% 24,504
Large Squarepoint Ops LLC $189,072 0.08% 23,114
Large Point72 Asset Management, L.P. $182,438 0.07% 22,303
Mid SIMPLEX TRADING, LLC $171,690 0.07% 20,989
Mid MEEDER ASSET MANAGEMENT INC $162,143 0.06% 19,822
Mid Diversified Trust Co Bank $143,673 0.06% 17,564
Micro Leibman Financial Services, Inc. $133,301 0.05% 16,296
Large MERCER GLOBAL ADVISORS INC /ADV $130,577 0.05% 15,963
Mega Vanguard Global Advisers, LLC $130,004 0.05% 15,893
Large SEI INVESTMENTS CO $129,022 0.05% 15,773
Small Jasper Ridge Partners, L.P. $122,961 0.05% 15,032
Mid Brooklyn Investment Group $116,311 0.05% 14,219
Large Focus Partners Wealth $113,857 0.05% 13,919
Mid WINTON GROUP Ltd $107,976 0.04% 13,200
Large Walleye Trading LLC $107,018 0.04% 13,083
Large Police & Firemen's Retirement System of New Jersey Pension $101,906 0.04% 12,458
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $101,677 0.04% 12,430

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