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 Sep 30, 2025
Ownership Breakdown
669
Institutional Holders
▼ 106 vs Q2
$6.54B
Total Inst. Value
▼ $4.22B vs Q2
141.82M
Shares Outstanding
freeFloat 92.47%
145.65M
13F Shares Held
▼ 14.32M vs Q2
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
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC retail-auto dealers & gasoline stations | 16.90M | 11.21% | 11.21% | $758.26B | Nov 7, 2025 | ▼ 665.7K |
BLACKROCK, INC. retail-auto dealers & gasoline stations | 11.48M | 7.62% | 7.62% | $515.21B | Nov 12, 2025 | ▲ 643.9K |
STATE STREET CORP retail-auto dealers & gasoline stations | 5.54M | 3.68% | 3.68% | $248.65B | Nov 14, 2025 | ▼ 127.1K |
JANUS HENDERSON GROUP PLC retail-auto dealers & gasoline stations | 4.88M | 3.23% | 3.23% | $218.75B | Nov 14, 2025 | ▲ 46.8K |
DIAMOND HILL CAPITAL MANAGEMENT INC retail-auto dealers & gasoline stations | 4.83M | 3.21% | 3.21% | $216.87B | Nov 5, 2025 | ▼ 2.13M |
PRIMECAP MANAGEMENT CO/CA/ retail-auto dealers & gasoline stations | 4.56M | 3.03% | 3.03% | $204.62B | Nov 12, 2025 | ▼ 177.5K |
DIMENSIONAL FUND ADVISORS LP retail-auto dealers & gasoline stations | 3.69M | 2.45% | 2.45% | $165.36B | Nov 12, 2025 | ▲ 918.6K |
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP retail-auto dealers & gasoline stations | 3.52M | 2.34% | 2.34% | $158.07B | Nov 13, 2025 | ▲ 1.49M |
INVESCO LTD. retail-auto dealers & gasoline stations | 3.43M | 2.27% | 2.27% | $153.71B | Nov 13, 2025 | ▲ 426.8K |
GEODE CAPITAL MANAGEMENT, LLC retail-auto dealers & gasoline stations | 3.42M | 2.27% | 2.27% | $153.00B | Nov 12, 2025 | ▼ 390.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
27
Increased
+10.59M shares1
New Positions
first time holders21
Decreased
−8.54M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.05M
+10.59M / −8.54M
Net new holders
+7
1 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 16.90 million shares — equal to 11.21% of outstanding shares — as of September 30, 2025.
A total of 669 institutional investors currently hold KMX stock, with a combined institutional value of approximately $6.54 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 11.21% stake. Company insiders hold 7.53%. Data sourced from SEC Form 13F as of September 30, 2025.