# MEDIAALPHA INC CL A

MEDIAALPHA INC CL A is a security (CUSIP 58450V104) tracked across SEC portfolio filings. 159 institutional managers reported $462.0M on Form 13F as of 2026-06-30; 15 registered fund positions totaling $5.0M via N-PORT as of 2026-05-31.

## Summary

- Issuer: MEDIAALPHA INC
- Class: CL A
- CUSIP: 58450V104
- Asset category: EC
- 13F holders: 159
- 13F value: $462.0M
- 13F period: 2026-06-30
- N-PORT fund positions: 15
- N-PORT value: $5.0M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 159 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| WHITE MOUNTAINS INSURANCE GROUP LTD | Hanover, NH | $166.1M | 17,856,614 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $33.3M | 2,570,992 |
| BlackRock, Inc. | New York, NY | $32.3M | 3,476,687 |
| Clearline Capital LP | NEW YORK, NY | $24.1M | 2,590,670 |
| J. Goldman & Co LP | NEW YORK, NY | $17.4M | 1,182,673 |
| JPMORGAN CHASE & CO | NEW YORK, NY | $16.5M | 1,745,679 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $10.0M | 1,070,084 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | BOSTON, MA | $9.9M | 1,061,981 |
| [JACOBS ASSET MANAGEMENT, LLC](https://search.stillhousedata.com/firm/156563) | NEW YORK, NY | $8.6M | 924,443 |
| STATE STREET CORP | BOSTON, MA | $7.8M | 838,161 |
| Shay Capital LLC | New York, NY | $7.2M | 775,000 |
| JACOBS LEVY EQUITY MANAGEMENT, INC | FLORHAM PARK, NJ | $7.0M | 750,054 |
| [RENAISSANCE TECHNOLOGIES LLC](https://search.stillhousedata.com/firm/106661) | NEW YORK, NY | $6.7M | 719,300 |
| MORGAN STANLEY | NEW YORK, NY | $6.5M | 703,018 |
| Nuveen, LLC | CHARLOTTE, NC | $6.5M | 701,399 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $3.5M | 0.43% |
| [Small Cap Growth Fund](https://search.stillhousedata.com/fund/S000008021) | VALIC Co II | $1.8M | 59.97% |
| [Small Cap Core Portfolio](https://search.stillhousedata.com/fund/S000051867) | Bernstein Fund Inc | $1.6M | 22.68% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $1.5M | 0.88% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $1.2M | 1.57% |
| [VANGUARD EXPLORER FUND](https://search.stillhousedata.com/fund/S000002578) | VANGUARD EXPLORER FUND | $932K | 0.43% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $499K | 1.03% |
| [Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF](https://search.stillhousedata.com/fund/S000048296) | Goldman Sachs ETF Trust | $375K | 3.81% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $169K | 0.03% |
| [BlackRock Advantage SMID Cap Fund, Inc.](https://search.stillhousedata.com/fund/S000002323) | BlackRock Advantage SMID Cap Fund, Inc. | $132K | 1.75% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $115K | 0.04% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $44K | 1.05% |
| [Putnam Multi-Asset Income Fund](https://search.stillhousedata.com/fund/S000067964) | Putnam Asset Allocation Funds | $9K | 0.10% |
| [TIAA Separate Account VA-1 - Stock Index Account](https://search.stillhousedata.com/fund/S000005098) | TIAA Separate Account VA-1 | $5K | 0.04% |
| [Neuberger Long Short Fund](https://search.stillhousedata.com/fund/S000035446) | NEUBERGER BERMAN ALTERNATIVE FUNDS | $-6.9M | -8.37% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/58450V104.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.