Security key
58450V104
MediaAlpha, Inc. - Class A Common Stock, $0.01 par value per share (MAX)
CUSIP: 58450V104
Q2 2026 13F Holders as of 30 Jun 2026
- Security type / class
- Equity / Class A Common Stock, $0.01 par value per share
- Total 13F shares
- 48,642,000
- Total 13F value
- $610,162,965
- Share change
- +95,808
- Put/Call ratio
- 0%
- SEC-reported price per share
- $12.57
- Number of holders
- 153
- Value change
- +$5,391,847
- Number of buys
- 67
- Number of sells
- 92
- 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
Q2 2026
Institutions
153
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
WHITE MOUNTAINS INSURANCE...
Disclosed value leader
WHITE MOUNTAINS INSURANCE...
Comparable rows
15/15
Latest evidence
15 May 2026
3/4/5
13D/G
13F
Lead comparable stake: 33%
13D/G row: WHITE MOUNTAINS INSURANCE GROUP LTD
Showing 1-6 of 15 holder rows.
Quick read
WHITE MOUNTAINS INSURANCE GROUP LTD leads the comparable SEC ownership view at 33%.
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 WHITE MOUNTAINS INSURANCE GROUP LTD's linked filing trail.
Comparable ownership
Top 5
WHITE MOUNTAINS INSURANCE GROUP LTD
33%
Eugene Nonko
11%
VANGUARD GROUP INC
4.6%
BlackRock, Inc.
4.2%
VRABECK KATHY P
0.28%
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 |
|---|---|---|---|---|---|
| WHITE MOUNTAINS INSURANCE GROUP LTD |
3/4/5
13D/G
13F
10%+ Owner · Company
|
33%
from 13D/G
|
$339,275,666
17,856,614 shares
|
— | 07 May 2024 |
| Eugene Nonko |
13D/G
|
11%
|
$50,433,626
5,996,864 shares
|
$0 | 26 Feb 2025 |
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
4.6%
|
$29,595,067
2,600,621 shares
|
-$3,558,606 | 30 Sep 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
4.2%
from 13D/G
|
$32,333,189
3,476,687 shares
|
— | 31 Mar 2026 |
| VRABECK KATHY P |
3/4/5
Director
|
0.28%
|
$1,398,785
150,407 shares
|
— | 05 May 2026 |
| Venmal (raji) Arasu |
3/4/5
Director
|
0.22%
|
$1,110,485
119,407 shares
|
— | 05 May 2026 |
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 Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
153
Shares
48,642,000
Rows available
153
| 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 Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
162
Q2 2026 holders
153
Holder diff
-9
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|