MEDIAALPHA INC-CLASS A (MAX) Institutional Shareholders
MEDIAALPHA INC-CLASS A (MAX) 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 $608.60M in MAX holdings during the latest filing period.
White Mountains Insurance Group Ltd is currently the largest disclosed institutional shareholder of MAX tracked by InsiderSet, reporting ownership valued at approximately $224.46M 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 $197.14M, representing an estimated loss of -12.17% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 66% of the total disclosed MAX value among the investors covered in this analysis. Major shareholders include White Mountains Insurance Group Ltd, Blackrock, Inc., Clearline Capital Lp, and several other long-term asset managers with concentrated positions in MEDIAALPHA INC-CLASS A (MAX).
This page ranks the largest institutional MAX 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
149
Total Reported Value
$608.60M
Largest Holder
White Mountains Insurance Group Ltd
Largest Position
$224.46M
Insider Transactions (90d)
50
Latest Filing Quarter
Q2 2026
New Institutional Positions
78
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| White Mountains Insurance Group Ltd | 57.03% | 17,856,614 | $224,457,638 | $197,137,019 | -$27,320,619 | -12.17% | |
| Blackrock, Inc. | 0.00% | 3,392,357 | $42,641,927 | $37,451,621 | -$5,190,306 | -12.17% | |
| Clearline Capital Lp | 2.20% | 2,713,890 | $34,113,597 | $29,961,346 | -$4,152,251 | -12.17% | |
| Jpmorgan Chase & Co | 0.00% | 1,880,062 | $23,293,969 | $20,755,884 | -$2,538,085 | -10.90% | |
| Vanguard Capital Management Llc | 0.00% | 1,276,369 | $16,043,958 | $14,091,114 | -$1,952,844 | -12.17% | |
| Geode Capital Management, Llc | 0.00% | 1,068,308 | $13,430,961 | $11,794,120 | -$1,636,841 | -12.19% | |
| Divisadero Street Capital Management, Lp | 0.30% | 1,019,988 | $12,821,249 | $11,260,668 | -$1,560,581 | -12.17% | |
| Jacobs Levy Equity Management, Inc | 0.04% | 971,232 | $12,208,386 | $10,722,401 | -$1,485,985 | -12.17% | |
| Acadian Asset Management Llc | 0.01% | 957,095 | $12,019,000 | $10,566,329 | -$1,452,671 | -12.09% | |
| Jacobs Asset Management, Llc | 8.71% | 919,761 | $11,561,396 | $10,154,161 | -$1,407,235 | -12.17% | |
| State Street Corp | 0.00% | 862,235 | $10,838,294 | $9,519,074 | -$1,319,220 | -12.17% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 829,958 | $10,432,572 | $9,162,736 | -$1,269,836 | -12.17% | |
| Morgan Stanley | 0.00% | 821,170 | $10,322,107 | $9,065,717 | -$1,256,390 | -12.17% | |
| Nuveen, Llc | 0.00% | 752,447 | $9,458,259 | $8,307,015 | -$1,151,244 | -12.17% | |
| Dimensional Fund Advisors Lp | 0.00% | 701,914 | $8,822,450 | $7,749,131 | -$1,073,319 | -12.17% | |
| J. Goldman & Co Lp | 0.26% | 598,070 | $7,517,740 | $6,602,693 | -$915,047 | -12.17% | |
| Citadel Advisors Llc | 0.00% | 589,696 | $7,412,479 | $6,510,244 | -$902,235 | -12.17% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 574,407 | $7,220,296 | $6,341,453 | -$878,843 | -12.17% |
| Shay Capital Llc | 0.79% | 570,000 | $7,164,900 | $6,292,800 | -$872,100 | -12.17% | |
| Jane Street Group, Llc | 0.00% | 551,625 | $6,933,926 | $6,089,940 | -$843,986 | -12.17% | |
| D. E. Shaw & Co., Inc. | 0.00% | 535,926 | $6,736,590 | $5,916,623 | -$819,967 | -12.17% | |
| Speece Thorson Capital Group Inc | 1.31% | 489,098 | $6,148,000 | $5,399,642 | -$748,358 | -12.17% | |
| Evr Research Lp | 2.73% | 440,000 | $5,530,800 | $4,857,600 | -$673,200 | -12.17% | |
| Vanguard Portfolio Management Llc | 0.00% | 433,046 | $5,443,388 | $4,780,828 | -$662,560 | -12.17% | |
| Goldman Sachs Group Inc | 0.00% | 428,866 | $5,390,845 | $4,734,681 | -$656,164 | -12.17% | |
| Two Sigma Investments, Lp | 0.00% | 409,480 | $5,147,164 | $4,520,659 | -$626,505 | -12.17% | |
| Aqr Capital Management Llc | 0.00% | 391,641 | $4,922,926 | $4,323,717 | -$599,209 | -12.17% | |
| Hrt Financial Lp | 0.01% | 372,929 | $4,687,000 | $4,117,136 | -$569,864 | -12.16% | |
| Bank Of America Corp | 0.00% | 371,840 | $4,674,029 | $4,105,114 | -$568,915 | -12.17% | |
| Triad Investment Management | 5.11% | 368,731 | $4,634,949 | $4,070,790 | -$564,159 | -12.17% | |
| Stoic Point Capital Management Llc | 3.14% | 297,150 | $3,735,176 | $3,280,536 | -$454,640 | -12.17% | |
| Northern Trust Corp | 0.00% | 267,107 | $3,357,535 | $2,948,861 | -$408,674 | -12.17% | |
| Charles Schwab Investment Management Inc | 0.00% | 259,224 | $3,258,446 | $2,861,833 | -$396,613 | -12.17% | |
| Squarepoint Ops Llc | 0.01% | 234,255 | $2,944,585 | $2,586,175 | -$358,410 | -12.17% | |
| Vanguard Fiduciary Trust Co | 0.00% | 223,917 | $2,814,637 | $2,472,044 | -$342,593 | -12.17% | |
| Teacher Retirement System Of Texas | 0.01% | 216,405 | $2,720,211 | $2,389,111 | -$331,100 | -12.17% | |
| Bnp Paribas Financial Markets | 0.00% | 209,204 | $2,629,694 | $2,309,612 | -$320,082 | -12.17% | |
| Xtx Topco Ltd | 0.03% | 172,269 | $2,165,421 | $1,901,850 | -$263,571 | -12.17% | |
| Algert Global Llc | 0.03% | 170,870 | $2,147,836 | $1,886,405 | -$261,431 | -12.17% | |
| Man Group Plc | 0.00% | 156,754 | $1,970,398 | $1,730,564 | -$239,834 | -12.17% | |
| Alliancebernstein L.P. | 0.00% | 211,450 | $1,966,485 | $2,334,408 | +$367,923 | +18.71% | |
| Principal Financial Group Inc | 0.00% | 148,845 | $1,870,982 | $1,643,249 | -$227,733 | -12.17% | |
| Quantinno Capital Management Lp | 0.00% | 136,034 | $1,709,947 | $1,501,815 | -$208,132 | -12.17% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 180,511 | $1,678,752 | $1,992,841 | +$314,089 | +18.71% | |
| Russell Investments Group, Ltd. | 0.00% | 130,360 | $1,629,701 | $1,439,174 | -$190,527 | -11.69% | |
| Stifel Financial Corp | 0.00% | 126,175 | $1,586,025 | $1,392,972 | -$193,053 | -12.17% | |
| Victory Capital Management Inc | 0.00% | 101,365 | $1,274,158 | $1,119,070 | -$155,088 | -12.17% | |
| Balyasny Asset Management L.P. | 0.00% | 101,046 | $1,270,148 | $1,115,548 | -$154,600 | -12.17% | |
| Qube Research & Technologies Ltd | 0.00% | 92,453 | $1,162,134 | $1,020,681 | -$141,453 | -12.17% | |
| Pdt Partners, Llc | 0.06% | 84,022 | $1,056,157 | $927,603 | -$128,554 | -12.17% |
Frequently asked questions about MAX
Who owns the most MAX stock?
The largest holders of MAX 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 MEDIAALPHA INC-CLASS A (MAX).
Is MAX widely held by superinvestors?
Many widely followed stocks like MAX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MAX 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.