PUBMATIC INC-CLASS A (PUBM) Institutional Shareholders
PUBMATIC INC-CLASS A (PUBM) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $391.91M in PUBM holdings during the latest filing period.
Graham Holdings Co is currently the largest disclosed institutional shareholder of PUBM tracked by InsiderSet, reporting ownership valued at approximately $44.59M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $59.65M, representing an estimated gain of +33.76% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 56% of the total disclosed PUBM value among the investors covered in this analysis. Major shareholders include Graham Holdings Co, Blackrock, Inc., Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in PUBMATIC INC-CLASS A (PUBM).
This page ranks the largest institutional PUBM shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
150
Total Reported Value
$391.91M
Largest Holder
Graham Holdings Co
Largest Position
$44.59M
Insider Transactions (90d)
38
Latest Filing Quarter
Q2 2026
New Institutional Positions
98
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Graham Holdings Co | 4.12% | 3,398,904 | $44,594,000 | $59,650,765 | +$15,056,765 | +33.76% | |
| Blackrock, Inc. | 0.00% | 3,279,530 | $43,027,436 | $57,555,752 | +$14,528,316 | +33.77% | |
| Vanguard Capital Management Llc | 0.00% | 1,661,312 | $21,796,413 | $29,156,026 | +$7,359,613 | +33.77% | |
| Acadian Asset Management Llc | 0.02% | 1,573,911 | $20,641,000 | $27,622,138 | +$6,981,138 | +33.82% | |
| Dimensional Fund Advisors Lp | 0.00% | 1,491,121 | $19,563,256 | $26,169,174 | +$6,605,918 | +33.77% | |
| Renaissance Technologies LLC | Jim Simons | 0.03% | 1,421,049 | $18,644,163 | $24,939,410 | +$6,295,247 | +33.77% |
| Whitefort Capital Management, Lp | 3.59% | 1,110,656 | $14,571,807 | $19,492,013 | +$4,920,206 | +33.77% | |
| Geode Capital Management, Llc | 0.00% | 991,800 | $13,015,466 | $17,406,090 | +$4,390,624 | +33.73% | |
| Vanguard Portfolio Management Llc | 0.00% | 947,548 | $12,431,830 | $16,629,467 | +$4,197,637 | +33.77% | |
| Jacobs Levy Equity Management, Inc | 0.04% | 862,996 | $11,322,508 | $15,145,580 | +$3,823,072 | +33.77% | |
| State Street Corp | 0.00% | 854,147 | $11,206,409 | $14,990,280 | +$3,783,871 | +33.77% | |
| S Squared Technology, Llc | 3.05% | 748,099 | $9,815,059 | $13,129,137 | +$3,314,078 | +33.77% | |
| Simcoe Capital Llc | 5.55% | 693,903 | $9,104,007 | $12,177,998 | +$3,073,991 | +33.77% | |
| Highbridge Capital Management Llc | 0.29% | 644,593 | $8,424,831 | $11,312,607 | +$2,887,776 | +34.28% | |
| American Century Companies Inc | 0.00% | 642,076 | $8,424,037 | $11,268,434 | +$2,844,397 | +33.77% | |
| Two Sigma Investments, Lp | 0.01% | 638,102 | $8,371,898 | $11,198,690 | +$2,826,792 | +33.77% | |
| Royal Bank Of Canada | 0.00% | 619,290 | $8,125,000 | $10,868,540 | +$2,743,540 | +33.77% | |
| Nuveen, Llc | 0.00% | 464,187 | $6,090,133 | $8,146,482 | +$2,056,349 | +33.77% | |
| Citadel Advisors Llc | 0.00% | 414,880 | $5,443,226 | $7,281,144 | +$1,837,918 | +33.77% | |
| Centerbook Partners Lp | 0.27% | 413,983 | $5,431,457 | $7,265,402 | +$1,833,945 | +33.77% | |
| Trexquant Investment Lp | 0.03% | 382,525 | $5,018,728 | $6,713,314 | +$1,694,586 | +33.77% | |
| Northern Trust Corp | 0.00% | 348,134 | $4,567,518 | $6,109,752 | +$1,542,234 | +33.77% | |
| Charles Schwab Investment Management Inc | 0.00% | 303,624 | $3,983,547 | $5,328,601 | +$1,345,054 | +33.77% | |
| Panagora Asset Management Inc | 0.01% | 287,735 | $3,775,083 | $5,049,749 | +$1,274,666 | +33.77% | |
| Aqr Capital Management Llc | 0.00% | 286,438 | $3,758,067 | $5,026,987 | +$1,268,920 | +33.77% | |
| Morgan Stanley | 0.00% | 284,256 | $3,729,448 | $4,988,693 | +$1,259,245 | +33.76% | |
| Quantinno Capital Management Lp | 0.00% | 249,688 | $3,275,907 | $4,382,024 | +$1,106,117 | +33.77% | |
| Vanguard Fiduciary Trust Co | 0.00% | 240,677 | $3,157,682 | $4,223,881 | +$1,066,199 | +33.77% | |
| Goldman Sachs Group Inc | 0.00% | 240,578 | $3,156,383 | $4,222,144 | +$1,065,761 | +33.77% | |
| Jpmorgan Chase & Co | 0.00% | 224,952 | $2,940,122 | $3,947,908 | +$1,007,786 | +34.28% | |
| Jane Street Group, Llc | 0.00% | 199,131 | $2,612,599 | $3,494,749 | +$882,150 | +33.77% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 195,563 | $2,565,787 | $3,432,131 | +$866,344 | +33.77% | |
| Ubs Group Ag | 0.00% | 186,033 | $2,440,753 | $3,264,879 | +$824,126 | +33.77% | |
| Susquehanna International Group, Llp | 0.00% | 182,447 | $2,393,705 | $3,201,945 | +$808,240 | +33.77% | |
| Boothbay Fund Management, Llc | 0.04% | 181,615 | $2,382,789 | $3,187,343 | +$804,554 | +33.77% | |
| Bridgeway Capital Management, Llc | 0.04% | 175,300 | $2,299,936 | $3,076,515 | +$776,579 | +33.77% | |
| Bank Of America Corp | 0.00% | 173,956 | $2,282,303 | $3,052,928 | +$770,625 | +33.77% | |
| Pinnacle Holdings, Llc | 0.64% | 158,250 | $2,076,240 | $2,777,288 | +$701,048 | +33.77% | |
| Diversified Investment Strategies, Llc | 1.19% | 140,000 | $1,836,800 | $2,457,000 | +$620,200 | +33.77% | |
| Ameriprise Financial Inc | 0.00% | 134,001 | $1,758,094 | $2,351,718 | +$593,624 | +33.77% | |
| Bank Of New York Mellon Corp | 0.00% | 121,540 | $1,594,607 | $2,133,027 | +$538,420 | +33.77% | |
| Invesco Ltd. | 0.00% | 103,232 | $1,354,404 | $1,811,722 | +$457,318 | +33.77% | |
| Jump Financial, Llc | 0.01% | 100,612 | $1,320,029 | $1,765,741 | +$445,712 | +33.77% | |
| Deutsche Bank Ag\ | 0.00% | 93,716 | $1,229,554 | $1,644,716 | +$415,162 | +33.77% | |
| Millennium Management Llc | 0.00% | 86,059 | $1,129,094 | $1,510,335 | +$381,241 | +33.77% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.00% | 85,805 | $1,125,762 | $1,505,878 | +$380,116 | +33.77% | |
| Victory Capital Management Inc | 0.00% | 84,859 | $1,113,350 | $1,489,275 | +$375,925 | +33.77% | |
| Russell Investments Group, Ltd. | 0.00% | 83,628 | $1,096,887 | $1,467,671 | +$370,784 | +33.80% | |
| Point72 Asset Management, L.P. | 0.00% | 79,362 | $1,041,229 | $1,392,803 | +$351,574 | +33.77% | |
| Group One Trading Llc | 0.03% | 72,405 | $949,954 | $1,270,708 | +$320,754 | +33.77% |
Frequently asked questions about PUBM
Who owns the most PUBM stock?
The largest holders of PUBM are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for PUBMATIC INC-CLASS A (PUBM).
Is PUBM widely held by superinvestors?
Many widely followed stocks like PUBM appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly PUBM is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.