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Equibles

PUBM

PubMatic, Inc.

Company with tickers: PUBM

CIK
1422930
CUSIP
74467Q103
Shares Outstanding
38,180,751
13F Activity (30d)
54 filings 53 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: 123
Total Value: $162,665,122
Total Shares: 19,885,719
Showing 1–100 of 127 holdings by value · page 1 of 2

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 122 13F filers · Δ vs Dec 31, 2025
Top Holder
10.6%
Jun 2023 → Mar 2026 · range 10.6% – 20.2%
−8.6 pts
Top 5
41.7%
Jun 2023 → Mar 2026 · range 40.9% – 56.2%
−3.9 pts
Top 10
64.8%
Jun 2023 → Mar 2026 · range 59.1% – 73.2%
+0.3 pts
HHI
532
Jun 2023 → Mar 2026 · range 485 – 880
Broadly held−127

Quarterly Activity

vs Dec 31, 2025
New
31
Increased
47
Decreased
26
Sold Out
32
Unchanged
19
Holder count: -1
Institutional value: +24.3%
Shares held: +34.7%

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 D. E. Shaw & Co., Inc. −101,379 445,114
Micro Leibman Financial Services, Inc. −99,314 16,296
Small Avestar Capital, LLC −95,000 55,000
Mega DEUTSCHE BANK AG\ −63,155 82,062
Mega BNP PARIBAS ARBITRAGE, SA −62,472 9,647

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 FIDUCIARY TRUST CO 230,629 $1,886,545
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC 175,300 $1,433,954
Large Man Group plc 117,730 $963,031

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
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
Large Walleye Capital LLC 161,873 $1,435,813
Large MARSHALL WACE, LLP 145,345 $1,289,209
Filter: New 31 Increased 47 Reduced 26 Sold out 32 Unchanged 19
Showing 100 of 127
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Small Graham Holdings Co $27,803,034 17.09% 3,398,904
Mid CenterBook Partners LP $14,250,378 8.76% 1,742,100
Mega VANGUARD CAPITAL MANAGEMENT LLC $13,200,630 8.12% 1,613,769
Large ACADIAN ASSET MANAGEMENT LLC $12,896,097 7.93% 1,576,540
Mega GEODE CAPITAL MANAGEMENT, LLC $7,775,948 4.78% 950,605
Large JACOBS LEVY EQUITY MANAGEMENT, INC $7,625,502 4.69% 932,213
Mega STATE STREET CORP $6,473,807 3.98% 791,419
Small Whitefort Capital Management, LP $5,644,200 3.47% 690,000
Small S SQUARED TECHNOLOGY, LLC $5,532,943 3.40% 676,399
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $5,362,808 3.30% 655,600
Large Walleye Trading LLC $4,671,598 2.87% 571,100
Mega TWO SIGMA INVESTMENTS, LP $4,371,792 2.69% 534,449
Small Simcoe Capital LLC $3,977,541 2.45% 486,252
Mega D. E. Shaw & Co., Inc. $3,641,032 2.24% 445,114
Large Trexquant Investment LP $3,455,420 2.12% 422,423
Large TUDOR INVESTMENT CORP ET AL $2,872,096 1.77% 351,112
Mega NORTHERN TRUST CORP Bank $2,376,788 1.46% 290,561
Large PANAGORA ASSET MANAGEMENT INC $2,259,774 1.39% 276,256
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,954,889 1.20% 238,984
Mega VANGUARD FIDUCIARY TRUST CO Bank $1,886,545 1.16% 230,629
Large Quantinno Capital Management LP $1,691,746 1.04% 206,815
Micro P.A.W. CAPITAL CORP $1,472,400 0.91% 180,000
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $1,433,954 0.88% 175,300
Small Pinnacle Holdings, LLC $1,291,491 0.79% 157,884
Small Diversified Investment Strategies, LLC $1,145,200 0.70% 140,000
Large Walleye Trading LLC $1,063,400 0.65% 130,000
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $987,751 0.61% 120,752
Large Man Group plc $963,031 0.59% 117,730
Mega AMERICAN CENTURY COMPANIES INC $918,384 0.56% 112,272
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $857,264 0.53% 104,800
Mega HSBC HOLDINGS PLC $738,809 0.45% 90,319
Mid GSA CAPITAL PARTNERS LLP $728,437 0.45% 89,051
Mega Nuveen, LLC $678,391 0.42% 82,933
Mega DEUTSCHE BANK AG\ Bank $671,267 0.41% 82,062
Small Cardinal Point Capital Management ULC $584,870 0.36% 71,500
Mid XTX Topco Ltd $559,986 0.34% 68,458
Large PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO Pension $543,364 0.33% 66,426
Large Russell Investments Group, Ltd. $542,255 0.33% 66,291
Mid GROUP ONE TRADING LLC $522,186 0.32% 63,837
Mid Brevan Howard Capital Management LP $472,853 0.29% 57,806
Small Avestar Capital, LLC $449,900 0.28% 55,000
Large VOYA INVESTMENT MANAGEMENT LLC $436,254 0.27% 53,332
Mega RHUMBLINE ADVISERS $406,979 0.25% 49,753
Large Creative Planning $394,676 0.24% 48,249
Small FOX RUN MANAGEMENT, L.L.C. $381,785 0.23% 46,673
Mid IMC-Chicago, LLC $301,367 0.19% 36,842
Large STRS OHIO $254,398 0.16% 31,100
Large LOS ANGELES CAPITAL MANAGEMENT LLC $226,651 0.14% 27,708
Mid Allworth Financial LP $205,874 0.13% 25,168
Small GWN SECURITIES INC. Broker-Dealer $201,571 0.12% 24,642
Large MetLife Investment Management, LLC $200,442 0.12% 24,504
Large Squarepoint Ops LLC $189,072 0.12% 23,114
Mid SIMPLEX TRADING, LLC $171,690 0.11% 20,989
Mid MEEDER ASSET MANAGEMENT INC $162,143 0.10% 19,822
Mid Diversified Trust Co Bank $143,673 0.09% 17,564
Micro Leibman Financial Services, Inc. $133,301 0.08% 16,296
Large MERCER GLOBAL ADVISORS INC /ADV $130,577 0.08% 15,963
Mega Vanguard Global Advisers, LLC $130,004 0.08% 15,893
Large SEI INVESTMENTS CO $129,022 0.08% 15,773
Small Jasper Ridge Partners, L.P. $122,961 0.08% 15,032
Mid Brooklyn Investment Group $116,311 0.07% 14,219
Large Focus Partners Wealth $113,857 0.07% 13,919
Mid WINTON GROUP Ltd $107,976 0.07% 13,200
Large Walleye Trading LLC $107,018 0.07% 13,083
Large Police & Firemen's Retirement System of New Jersey Pension $101,906 0.06% 12,458
Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Pension $101,677 0.06% 12,430
Mid PRELUDE CAPITAL MANAGEMENT, LLC $101,023 0.06% 12,350
Large Cetera Investment Advisers $100,278 0.06% 12,259
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $96,131 0.06% 11,752
Small Inscription Capital, LLC $93,947 0.06% 11,485
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $87,010 0.05% 10,637
Large M&T Bank Corp Bank $82,567 0.05% 10,094
Large Centiva Capital, LP $81,800 0.05% 10,000
Mega BNP PARIBAS ARBITRAGE, SA $78,912 0.05% 9,647
Mega Legal & General Group Plc $69,341 0.04% 8,477
Small Versant Capital Management, Inc $66,871 0.04% 8,175
Small State of Wyoming $60,687 0.04% 7,419
Large CWM, LLC $55,215 0.03% 6,750
Large Rockefeller Capital Management L.P. $41,177 0.03% 5,034
Mega CITIGROUP INC $40,122 0.02% 4,905
Mid GAMMA Investing LLC $36,041 0.02% 4,406
Large Mirae Asset Global Investments Co., Ltd. $34,053 0.02% 4,163
Mid Ameritas Investment Partners, Inc. $24,998 0.02% 3,056
Small Caitong International Asset Management Co., Ltd $23,010 0.01% 2,813
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $16,662 0.01% 2,037
Large JONES FINANCIAL COMPANIES LLLP $15,975 0.01% 1,953
Large NISA INVESTMENT ADVISORS, LLC $12,989 0.01% 1,588
Mid Tower Research Capital LLC (TRC) $10,723 0.01% 1,311
Mid Sterling Capital Management LLC $10,593 0.01% 1,295
Mid State of Alaska, Department of Revenue $10,364 0.01% 1,267
Small Covestor Ltd $8,458 0.01% 1,034
Mid MassMutual Private Wealth & Trust, FSB $6,609 0.00% 808
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $6,192 0.00% 757
Mid HARBOUR INVESTMENTS, INC. $5,317 0.00% 650
Mid SBI Securities Co., Ltd. Broker-Dealer $5,153 0.00% 630
Mid Western Wealth Management, LLC $4,908 0.00% 600
Small ADIRONDACK TRUST CO Bank $4,490 0.00% 549
Small NFSG Corp $4,090 0.00% 500
Mid Parallel Advisors, LLC $3,762 0.00% 460
Mid EverSource Wealth Advisors, LLC $3,762 0.00% 460

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