Company · Ownership research

MediaAlpha, Inc. MAX

CIK 0001818383 · CUSIP 58450V104

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 58450V104 (MAX), not CUSIP 58450V904 (MAX), CUSIP 58450V954 (MAX), and does not merge CUSIPs.

This page lists the top 20 of 172 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	WHITE MOUNTAINS INSURANCE GROUP LTD CIK 776867 · View history	$231.24M 17,856,614 shares	88.28%	0(0.00%)Unchanged	SEC filing ↗ Feb 12, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$45.99M 3,551,465 shares	0.00%	-21.73K(-0.60%)Reduced	SEC filing ↗ Feb 12, 2026	▾
03	VANGUARD GROUP INC CIK 102909 · View history	$33.29M 2,570,992 shares	0.00%	-29.63K(-1.10%)Reduced	SEC filing ↗ Jan 29, 2026	▾
04	JPMORGAN CHASE & CO CIK 19617 · View history	$17.71M 1,367,896 shares	0.00%	+309.45K(+29.20%)Added	SEC filing ↗ Feb 11, 2026	▾
05	Clearline Capital LP CIK 1600136 · View history	$16.85M 1,301,453 shares	1.27%	+10.60K(+0.80%)Added	SEC filing ↗ Feb 17, 2026	▾
06	RENAISSANCE TECHNOLOGIES LLC CIK 1037389 · View history	$13.54M 1,045,400 shares	0.02%	+100.30K(+10.60%)Added	SEC filing ↗ Feb 12, 2026	▾
07	MORGAN STANLEY CIK 895421 · Amended · View history	$12.43M 960,154 shares	0.00%	+88.12K(+10.10%)Added	SEC filing ↗ May 27, 2026	▾
08	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$11.08M 855,904 shares	0.01%	+335.45K(+64.50%)Added	SEC filing ↗ Feb 13, 2026	▾
09	Divisadero Street Capital Management, LP CIK 1901865 · View history	$10.99M 849,011 shares	0.63%	+762.10K(+876.90%)Added	SEC filing ↗ Feb 17, 2026	▾
10	AQR CAPITAL MANAGEMENT LLC CIK 1167557 · View history	$10.41M 804,095 shares	0.01%	+33.42K(+4.30%)Added	SEC filing ↗ Feb 17, 2026	▾
11	J. Goldman & Co LP CIK 1412741 · View history	$10.18M 786,369 shares	0.40%	+255.34K(+48.10%)Added	SEC filing ↗ Feb 17, 2026	▾
12	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$10.07M 777,304 shares	0.00%	+7.53K(+1.00%)Added	SEC filing ↗ Feb 9, 2026	▾
13	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$9.74M 751,745 shares	0.01%	-677.81K(-47.40%)Reduced	SEC filing ↗ Feb 17, 2026	▾
14	STATE STREET CORP CIK 93751 · View history	$9.47M 731,407 shares	0.00%	+59.28K(+8.80%)Added	SEC filing ↗ Feb 13, 2026	▾
15	VICTORY CAPITAL MANAGEMENT INC CIK 1040188 · View history	$9.45M 729,457 shares	0.01%	+18.64K(+2.60%)Added	SEC filing ↗ Feb 13, 2026	▾
16	GOLDMAN SACHS GROUP INC CIK 886982 · Amended · View history	$9.45M 729,367 shares	0.00%	-550.59K(-43.00%)Reduced	SEC filing ↗ Mar 25, 2026	▾
17	JACOBS ASSET MANAGEMENT, LLC CIK 1351063 · View history	$9.13M 705,299 shares	5.09%	-113.73K(-13.90%)Reduced	SEC filing ↗ Feb 13, 2026	▾
18	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$9.07M 700,497 shares	0.04%	+139.73K(+24.90%)Added	SEC filing ↗ Feb 13, 2026	▾
19	Nuveen, LLC CIK 1871926 · View history	$8.63M 666,539 shares	0.00%	-23.93K(-3.50%)Reduced	SEC filing ↗ Feb 12, 2026	▾
20	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$7.84M 606,171 shares	0.01%	+186.33K(+44.40%)Added	SEC filing ↗ Feb 10, 2026	▾

Showing 20 / 172 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

172

Cancelled or null records excluded

Disclosed shares

47,777,669

Not deduplicated across managers

Disclosed value

$618.56M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

MediaAlpha, Inc. · Q4 2025

Explore all 172 reporting institutions.

This page includes 20 of 172 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.