CarMax, Inc.
CarMax, Inc. (KMX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · KMX · as of Mar 31, 2025
Ownership Breakdown
797
Institutional Holders
▲ 3 vs Q4
$12.64B
Total Inst. Value
▼ $502.97M vs Q4
141.82M
Shares Outstanding
freeFloat 92.47%
162.28M
13F Shares Held
▲ 1.48M vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
KMX largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC retail-auto dealers & gasoline stations | 18.09M | 11.64% | 11.64% | $1.41T | May 9, 2025 | ▼ 109.6K |
BLACKROCK, INC. retail-auto dealers & gasoline stations | 12.09M | 7.78% | 7.78% | $941.76B | May 2, 2025 | ▼ 51.2K |
PRINCIPAL FINANCIAL GROUP INC retail-auto dealers & gasoline stations | 6.59M | 4.24% | 4.24% | $513.28B | Apr 28, 2025 | ▼ 2.00M |
STATE STREET CORP retail-auto dealers & gasoline stations | 6.21M | 4.00% | 4.00% | $484.18B | May 15, 2025 | ▼ 132.2K |
DIAMOND HILL CAPITAL MANAGEMENT INC retail-auto dealers & gasoline stations | 5.86M | 3.77% | 3.77% | $456.54B | May 6, 2025 | ▼ 362.6K |
NORGES BANK retail-auto dealers & gasoline stations | 5.61M | 3.61% | 3.61% | $436.86B | May 11, 2026 | ▲ 430.5K |
PRIMECAP MANAGEMENT CO/CA/ retail-auto dealers & gasoline stations | 4.77M | 3.07% | 3.07% | $371.62B | May 9, 2025 | ▼ 311.1K |
JANUS HENDERSON GROUP PLC retail-auto dealers & gasoline stations | 4.74M | 3.05% | 3.05% | $360.51B | May 15, 2025 | ▲ 72.2K |
GEODE CAPITAL MANAGEMENT, LLC retail-auto dealers & gasoline stations | 3.82M | 2.46% | 2.46% | $296.72B | May 13, 2025 | ▲ 110.0K |
HOLOCENE ADVISORS, LP retail-auto dealers & gasoline stations | 3.37M | 2.17% | 2.17% | $262.34B | May 15, 2025 | ▲ 523.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
31
Increased
+8.41M shares0
New Positions
first time holders19
Decreased
−5.37M shares0
Sold Out
fully exitedNet shares change (top 50)
+3.05M
+8.41M / −5.37M
Net new holders
+12
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
KMX insider trading · insider activity
Source: SEC Form 4
5
Buy transactions
3
Sell transactions
1.67
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Mayor-Mora Enrique N EVP & CFO | May 1, 2026 | Award | 22,898 | — | — | 22.9K | Form 4 ↗ |
Mayor-Mora Enrique N EVP & CFO | May 1, 2026 | Tax Withhold | 1,015 | $38.53 | $39.1K | 22.9K | Form 4 ↗ |
Daniels Jon G EVP, CAF | May 1, 2026 | Award | 14,655 | — | — | 14.7K | Form 4 ↗ |
Daniels Jon G EVP, CAF | May 1, 2026 | Tax Withhold | 822 | $38.53 | $31.7K | 2.0K | Form 4 ↗ |
Cafritz Diane L EVP, Chief Innov & People Off | May 1, 2026 | Award | 22,898 | — | — | 22.9K | Form 4 ↗ |
Cafritz Diane L EVP, Chief Innov & People Off | May 1, 2026 | Tax Withhold | 1,015 | $38.53 | $39.1K | 9.6K | Form 4 ↗ |
Stuckey John M III SVP, Gen Counsel & Secretary | May 1, 2026 | Award | 10,075 | — | — | 10.1K | Form 4 ↗ |
Stuckey John M III SVP, Gen Counsel & Secretary | May 1, 2026 | Tax Withhold | 357 | $38.53 | $13.8K | 2.5K | Form 4 ↗ |
Wilson Charles Joseph EVP and COO | May 1, 2026 | Award | 22,898 | — | — | 22.9K | Form 4 ↗ |
Wilson Charles Joseph EVP and COO | May 1, 2026 | Tax Withhold | 1,015 | $38.53 | $39.1K | 19.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
CarMax, Inc. (KMX) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 7.53%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of CarMax, Inc. is VANGUARD GROUP INC, holding approximately 18.09 million shares — equal to 11.64% of outstanding shares — as of March 31, 2025.
A total of 797 institutional investors currently hold KMX stock, with a combined institutional value of approximately $12.64 billion as of the most recent 13F filing period.
Frequently asked questions
KMX ownershipCarMax, Inc. (KMX) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is VANGUARD GROUP INC with a 11.64% stake. Company insiders hold 7.53%. Data sourced from SEC Form 13F as of March 31, 2025.