Company: KMX
Filing Date: 2025-05-08
Form Type: DEFA14A
Source: 0001170010-25-000075
Chunk: 0

Company: CARMAX INC
Filing Date: 2025-05-08
Form: DEFA14A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
<div align='center'>SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. __ )</div>

Filed by the Registrant ý Filed by a Party other than the Registrant o

Check the appropriate box:

| o |     | Preliminary Proxy Statement |

| o |     | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |

| o |     | Definitive Proxy Statement |

| ý |     | Definitive Additional Materials |

| o |     | Soliciting Material under §240.14a-12 |

| CarMax, Inc.                                     |
| (Name of Registrant as Specified In Its Charter) |

| (Name of Person(s) Filing Proxy Statement, if other than the Registrant) |

Payment of Filing Fee (Check the appropriate box):

| ý |     | No fee required. |

| o |     | Fee paid previously with preliminary materials. |

| o |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |