Security key
58450V104
MediaAlpha, Inc. - Class A Common Stock, $0.01 par value per share (MAX)
CUSIP: 58450V104
Q1 2025 13F Holders as of 31 Mar 2025
- Security type / class
- Equity / Class A Common Stock, $0.01 par value per share
- Total 13F shares
- 47,216,825
- Total 13F value
- $436,277,189
- Share change
- -734,280
- Put/Call ratio
- 36%
- SEC-reported price per share
- $9.24
- Number of holders
- 144
- Value change
- -$13,260,709
- Number of buys
- 78
- Number of sells
- 78
- Shares outstanding
- 53,948,069
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2025
Institutions
144
Top holders
10
MAX full security history
Ownership snapshot
Full 13F holder table
MediaAlpha, Inc. SEC filings
MediaAlpha, Inc. company facts
Broader feeds
Ownership snapshot
Top reported holders of MAX - MediaAlpha, Inc. - Class A Common Stock, $0.01 par value per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Eugene Nonko
Disclosed value leader
WHITE MOUNTAINS INSURANCE...
Comparable rows
15/15
Latest evidence
26 Feb 2025
13D/G
13F
3/4/5
Lead comparable stake: 11%
13D/G row: Eugene Nonko
Showing 1-6 of 15 holder rows.
Quick read
Eugene Nonko leads the comparable SEC ownership view at 11%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Eugene Nonko's linked filing trail.
Comparable ownership
Top 5
Eugene Nonko
11%
BlackRock, Inc.
4.2%
WHITE MOUNTAINS INSURANCE GROUP LTD
33%
VANGUARD GROUP INC
6.7%
Broad Bay Capital Management, LP
4.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Eugene Nonko |
13D/G
|
11%
|
$50,433,626
5,996,864 shares
|
$0 | 26 Feb 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
4.2%
from 13D/G
|
$40,159,083
3,557,049 shares
|
— | 31 Dec 2024 |
| WHITE MOUNTAINS INSURANCE GROUP LTD |
3/4/5
13F
10%+ Owner · Company
|
33%
from 13F
|
$339,275,666
17,856,614 shares
|
— | 07 May 2024 |
| VANGUARD GROUP INC |
13F
Company
|
6.7%
|
$40,907,554
3,623,344 shares
|
— | 31 Dec 2024 |
| Broad Bay Capital Management, LP |
13F
Company
|
4.1%
|
$25,048,954
2,218,685 shares
|
— | 31 Dec 2024 |
| TimesSquare Capital Management, LLC |
13F
Company
|
3%
|
$18,389,321
1,628,815 shares
|
— | 31 Dec 2024 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
144
Shares
47,216,825
Rows available
144
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2025 vs Q1 2025 Across Filers
Q1 2025 holders
144
Q1 2025 holders
144
Holder diff
0
| Investor | Q1 2025 Shares | Q1 2025 Shares | Share Diff | Share Chg % | Q1 2025 value | Q1 2025 value | Value change | Value Chg % |
|---|