MEDIAALPHA INC-CLASS A (MAX) Top 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 March 31, 2026. The institutional investors covered on this page collectively reported approximately $421.01M 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 $166.07M in its March 31, 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 $178.92M, representing an estimated gain of +7.74% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 69% 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
158
Total Reported Value
$421.01M
Largest Holder
White Mountains Insurance Group Ltd
Largest Position
$166.07M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
187
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 | 52.99% | 17,856,614 | $166,066,510 | $178,923,272 | +$12,856,762 | +7.74% | |
| Blackrock, Inc. | 0.00% | 3,476,687 | $32,333,189 | $34,836,404 | +$2,503,215 | +7.74% | |
| Clearline Capital Lp | 1.87% | 2,590,670 | $24,093,231 | $25,958,513 | +$1,865,282 | +7.74% | |
| Vanguard Capital Management Llc | 0.00% | 1,385,729 | $12,887,280 | $13,885,005 | +$997,725 | +7.74% | |
| J. Goldman & Co Lp | 0.51% | 1,182,673 | $10,998,859 | $11,850,383 | +$851,524 | +7.74% | |
| Geode Capital Management, Llc | 0.00% | 1,070,084 | $9,953,383 | $10,722,242 | +$768,859 | +7.72% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 1,061,981 | $9,876,423 | $10,641,050 | +$764,627 | +7.74% | |
| Triad Investment Management | 3.41% | 944,973 | $9,258,263 | $9,468,629 | +$210,366 | +2.27% | |
| Jacobs Asset Management, Llc | 5.15% | 924,443 | $8,597,320 | $9,262,919 | +$665,599 | +7.74% | |
| State Street Corp | 0.00% | 838,161 | $7,794,897 | $8,398,373 | +$603,476 | +7.74% | |
| Shay Capital Llc | 1.02% | 775,000 | $7,207,500 | $7,765,500 | +$558,000 | +7.74% | |
| Jacobs Levy Equity Management, Inc | 0.03% | 750,054 | $6,975,502 | $7,515,541 | +$540,039 | +7.74% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 719,300 | $6,689,490 | $7,207,386 | +$517,896 | +7.74% |
| Morgan Stanley | 0.00% | 703,018 | $6,538,067 | $7,044,240 | +$506,173 | +7.74% | |
| Nuveen, Llc | 0.00% | 701,399 | $6,523,011 | $7,028,018 | +$505,007 | +7.74% | |
| Goldman Sachs Group Inc | 0.00% | 623,421 | $5,797,815 | $6,246,678 | +$448,863 | +7.74% | |
| Dimensional Fund Advisors Lp | 0.00% | 620,669 | $5,772,533 | $6,219,103 | +$446,570 | +7.74% | |
| Vanguard Portfolio Management Llc | 0.00% | 546,745 | $5,084,729 | $5,478,385 | +$393,656 | +7.74% | |
| Aqr Capital Management Llc | 0.00% | 481,951 | $4,482,145 | $4,829,149 | +$347,004 | +7.74% | |
| Philadelphia Financial Management Of San Francisco, Llc | 1.43% | 480,000 | $4,464,000 | $4,809,600 | +$345,600 | +7.74% | |
| Qube Research & Technologies Ltd | 0.01% | 415,280 | $3,862,104 | $4,161,106 | +$299,002 | +7.74% | |
| Franklin Resources Inc | 0.00% | 343,709 | $3,196,494 | $3,443,964 | +$247,470 | +7.74% | |
| D. E. Shaw & Co., Inc. | 0.00% | 342,058 | $3,181,139 | $3,427,421 | +$246,282 | +7.74% | |
| Alliancebernstein L.P. | 0.00% | 205,440 | $2,660,448 | $2,058,509 | -$601,939 | -22.63% | |
| Jane Street Group, Llc | 0.00% | 283,008 | $2,631,974 | $2,835,740 | +$203,766 | +7.74% | |
| Bank Of America Corp | 0.00% | 279,704 | $2,601,247 | $2,802,634 | +$201,387 | +7.74% | |
| Charles Schwab Investment Management Inc | 0.00% | 274,339 | $2,551,353 | $2,748,877 | +$197,524 | +7.74% | |
| Northern Trust Corp | 0.00% | 271,824 | $2,527,963 | $2,723,676 | +$195,713 | +7.74% | |
| Citadel Advisors Llc | 0.00% | 229,323 | $2,132,704 | $2,297,816 | +$165,112 | +7.74% | |
| Vanguard Fiduciary Trust Co | 0.00% | 227,112 | $2,112,142 | $2,275,662 | +$163,520 | +7.74% | |
| Stoic Point Capital Management Llc | 2.02% | 221,041 | $2,055,681 | $2,214,831 | +$159,150 | +7.74% | |
| Squarepoint Ops Llc | 0.00% | 215,541 | $2,004,531 | $2,159,721 | +$155,190 | +7.74% | |
| Susquehanna International Group, Llp | 0.00% | 189,736 | $1,764,545 | $1,901,155 | +$136,610 | +7.74% | |
| Teacher Retirement System Of Texas | 0.01% | 185,325 | $1,723,521 | $1,856,957 | +$133,436 | +7.74% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 180,511 | $1,678,752 | $1,808,720 | +$129,968 | +7.74% | |
| Two Sigma Investments, Lp | 0.00% | 175,289 | $1,630,188 | $1,756,396 | +$126,208 | +7.74% | |
| Y-Intercept (Hong Kong) Ltd | 0.03% | 158,170 | $1,470,981 | $1,584,863 | +$113,882 | +7.74% | |
| Ubs Group Ag | 0.00% | 153,883 | $1,431,112 | $1,541,908 | +$110,796 | +7.74% | |
| Caption Management, Llc | 0.07% | 149,048 | $1,386,146 | $1,493,461 | +$107,315 | +7.74% | |
| Xtx Topco Ltd | 0.02% | 146,838 | $1,365,593 | $1,471,317 | +$105,724 | +7.74% | |
| Principal Financial Group Inc | 0.00% | 137,613 | $1,279,801 | $1,378,882 | +$99,081 | +7.74% | |
| Man Group Plc | 0.00% | 136,707 | $1,271,375 | $1,369,804 | +$98,429 | +7.74% | |
| Balyasny Asset Management L.P. | 0.00% | 108,808 | $1,011,914 | $1,090,256 | +$78,342 | +7.74% | |
| Quantinno Capital Management Lp | 0.00% | 107,274 | $997,648 | $1,074,885 | +$77,237 | +7.74% | |
| State Of Wisconsin Investment Board | 0.00% | 106,160 | $987,288 | $1,063,723 | +$76,435 | +7.74% | |
| Pdt Partners, Llc | 0.05% | 90,022 | $837,205 | $902,020 | +$64,815 | +7.74% | |
| Victory Capital Management Inc | 0.00% | 87,269 | $811,602 | $874,435 | +$62,833 | +7.74% | |
| Bank Of New York Mellon Corp | 0.00% | 86,955 | $808,681 | $871,289 | +$62,608 | +7.74% | |
| Divisadero Street Capital Management, Lp | 0.04% | 86,907 | $808,235 | $870,808 | +$62,573 | +7.74% | |
| Russell Investments Group, Ltd. | 0.00% | 84,894 | $794,000 | $850,638 | +$56,638 | +7.13% |
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.