UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~July~~September 2317, 2025

CARMAX ~~AUTO~~SELECT ~~OWNER~~RECEIVABLES TRUST 2025-3B

(Issuing Entity with respect to Securities)

(Central Index Key Number: ~~0002074530~~0002083722)

CARMAX BUSINESS SERVICES, LLC

(Sponsor with respect to Securities)

(Central Key Index Number: 0001601902)

CARMAX AUTO FUNDING LLC

(Depositor with respect to Securities)

(Central Key Index Number: 0001259380)

Delaware	333-283219-04	01-0794037
(State or other jurisdiction ofincorporation or organization)	333-283219	(Registrant’s IRS EmployerIdentification No.)
	(CommissionFile Number)

Delaware

~~12800~~(State ~~Tuckahoe~~or ~~Creek~~other jurisdiction ~~Parkway,~~of ~~Suite~~incorporation ~~400~~or organization)

333-288943-01

(Commission File Number)

01-0794037

(Registrant’s IRS Employer Identification No.)

12800 Tuckahoe Creek Parkway

Richmond, VA 23238-1115

(Address of principal executive offices of registrant, including zip ~~code~~Code)

Registrant’s telephone number, including area code: (804) 935-4512

Former name or former address, if changed since last report: Not applicable

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:

Title of each class ~~TradingSymbol~~Trading Symbol(s) Name of each ~~exchangeon~~exchange on which registered N/A N/A N/A

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act (§230.405 of this chapter) or Rule 12b-2 of the Exchange Act (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 81.01. ~~Other~~Entry ~~Events~~into a Material Definitive Agreement

On September 17, 2025, CarMax Business Services, LLC (“CarMax Business Services”) and CarMax Auto Funding LLC (the “Depositor”) entered into an Underwriting Agreement with J.P. Morgan Securities LLC, aas ~~Delaware~~representative ~~limited~~of ~~liability~~the ~~company~~several underwriters named therein (collectively, the “~~Depositor~~Underwriters”), whereby each of the Underwriters has ~~registered~~severally anagreed ~~issuance~~to purchase $840,950,000 aggregate principal balance of ~~asset~~various classes of Asset-backed ~~notes~~Notes onto ~~Form~~be SFissued by CarMax Select Receivables Trust 2025-3B (~~Commission~~the ~~File~~“Issuing ~~No. 333-283219~~Entity”), ~~filed~~a onDelaware ~~November 14~~statutory trust created pursuant to that certain Trust Agreement, ~~2024~~dated ~~and~~as of August 8, 2025, as will be amended and restated by ~~Pre-Effective~~the ~~Amendment~~Amended ~~No.~~and Restated Trust Agreement to be dated as of September 1, on2025 between the Depositor and U.S. Bank Trust National ~~December 17~~Association, ~~2024~~as owner trustee (the “~~Registration~~Owner ~~Statement~~Trustee”). The Underwriting Agreement provides that the obligations of the Underwriters are subject to specified conditions precedent and that the Underwriters will purchase the Notes (defined below).

OnThe ~~July 23,~~sale ~~2025~~of (the ~~“Closing~~Offered ~~Date”),~~Notes ~~the~~has ~~Depositor~~been ~~entered~~registered ~~into~~pursuant ~~an Amended~~to ~~and~~the ~~Restated~~Securities ~~Trust~~Act ~~Agreement, a copy~~ of ~~which is filed as an exhibit hereto~~1933, ~~with U.S. Bank Trust National Association,~~ as ~~owner~~amended ~~trustee~~ (the “~~Owner~~Securities ~~Trustee~~Act”), ~~relating~~under toa Registration ~~CarMax~~Statement ~~Auto~~on ~~Owner~~Form ~~Trust 2025~~SF-3 (~~the~~Commission ~~“Issuing~~File ~~Entity”~~No. 333-288943), afiled ~~Delaware statutory trust created~~ on ~~June~~July 1125, 2025. OnIt ~~the Closing Date, CarMax Business Services, LLC (“CarMax Business Services”) and the Depositor entered into a Receivables Purchase Agreement, a copy of which~~ is ~~filed~~anticipated asthat ~~an exhibit hereto, pursuant to which specified motor vehicle retail installment sale contracts and related property were sold by CarMax Business Services to~~ the ~~Depositor.~~Notes On the Closing Date, the Issuing Entity, the Depositor and CarMax Business Services, as servicer, entered into a Sale and Servicing Agreement, a copy of which is filed as an exhibit hereto, pursuant to which motor vehicle retail installment sale contracts and related property were transferred by the Depositor to the Issuing Entity, and the Issuing Entity will ~~engage~~be ~~CarMax Business Services to service those assets. On the Closing Date, the Issuing Entity~~ issued to the Depositor the Class A-1 Asset-backed Notes, Class A-2a Asset-backed Notes, Class A-2b Asset-backed Notes, Class A-3 Asset-backed Notes, Class A-4 Asset-backed Notes, Class B Asset-backed Notes, Class C Asset-backed Notes and Class D Asset-backed Notes, having an aggregate original principal amount of $1,450,000,000, pursuant to an Indenture entered into between the Issuing Entity and Wilmington Trust, National Association, as indenture trustee (the “Indenture Trustee”), on ~~the~~or ~~Closing~~about ~~Date~~September 24, a2025 copy of which is filed as an exhibit hereto. On the Closing Date, the Issuing Entity, the Indenture Trustee and CarMax Business Services, as administrator, entered into an Administration Agreement, a copy of which is filed as an exhibit hereto, pursuant to which the administrator agreed to perform certain duties and obligations of the Issuing Entity and the Owner Trustee under the transaction documents. On the Closing Date, the Issuing Entity, CarMax Business Services, as servicer, and Clayton Fixed Income Services LLC, as asset representations reviewer (the “~~Asset~~Issuance ~~Representations Reviewer~~Date”), entered into an Asset Representations Review Agreement, a copy of which is filed as an exhibit hereto, pursuant to which the Asset Representations Reviewer agreed to perform, upon satisfaction of certain trigger events, reviews of certain receivables for compliance with the representations and warranties made by CarMax Business Services and the Depositor about such receivables.

~~Item~~The 9Underwriting Agreement is attached as Exhibit 1.011. ~~Exhibits.~~

ExhibitNo.		Description
4.1		Indenture between CarMax Auto Owner Trust 2025-3 and Wilmington Trust, National Association, as indenture trustee, dated as of July 1, 2025.
4.2		Amended and Restated Trust Agreement between CarMax Auto Funding LLC, as depositor, and U.S. Bank Trust National Association, as owner trustee, dated as of July 1, 2025.
99.1		Sale and Servicing Agreement among CarMax Business Services, LLC, as servicer, CarMax Auto Funding LLC, as depositor, and CarMax Auto Owner Trust 2025-3, dated as of July 1, 2025.
99.2		Receivables Purchase Agreement between CarMax Business Services, LLC, as seller, and CarMax Auto Funding LLC, as purchaser, dated as of July 1, 2025.
99.3		Administration Agreement among CarMax Business Services, LLC, as administrator, CarMax Auto Owner Trust 2025-3 and Wilmington Trust, National Association, as indenture trustee, dated as of July 1, 2025.
99.4		Asset Representations Review Agreement among CarMax Auto Owner Trust 2025-3, CarMax Business Services, LLC, as servicer, and Clayton Fixed Income Services LLC, as asset representations reviewer, dated as of July 1, 2025.

Item 8.01.

Other Events.

The registrant has filed a final prospectus, dated September 17, 2025, setting forth a description of the collateral pool and the structure of $203,800,000 aggregate principal amount of the Class A-1 Asset-backed Notes (the “Class A-1 Notes”), $303,160,000 aggregate principal amount of the Class A-2 Asset-backed Notes (the “Class A-2 Notes”), $177,040,000 aggregate principal amount of the Class A-3 Asset-backed Notes (the “Class A-3 Notes”), $60,920,000 aggregate principal amount of the Class B Asset-backed Notes (the “Class B Notes”), $71,540,000 aggregate principal amount of the Class C Asset-backed Notes (the “Class C Notes”) and $68,770,000 aggregate principal amount of the Class D Asset-backed Notes (the “Class D Notes” and together with the Class A-1 Notes, the Class A-2 Notes, the Class A-3 Notes, the Class B Notes and the Class C Notes, other than the Retained Notes, the “Offered Notes”) and $14,770,000 aggregate principal amount of the Class E Asset-backed Notes (the “Class E Notes”, and together with the Offered Notes and the Retained Notes, the “Notes”) by the Issuing Entity. At least five percent (5%) of each class of the Notes (the “Retained Notes”) will be retained by the registrant. Each of the Offered Notes is being offered publicly for sale. The Class E Notes are not being publicly offered for sale under the prospectus.

On the Issuance Date, the Depositor will enter into an Amended and Restated Trust Agreement, in substantially the form of which is filed as an exhibit hereto, with the Owner Trustee, relating to the Issuing Entity. On the Issuance Date, the Issuing Entity, as grantor trust seller, will enter into an Amended and Restated Grantor Trust Agreement, in substantially the form of which is filed as an exhibit hereto, with U.S. Bank Trust National Association, as grantor trust trustee (the “Grantor Trust Trustee”), relating to CarMax Select Receivables Grantor Trust 2025-B (the “Grantor Trust”), a Delaware statutory trust created pursuant to that certain Grantor Trust Agreement, dated as of August 8, 2025. On the Issuance Date, CarMax Business Services and the Depositor will enter into a Receivables Purchase Agreement, in substantially the form of which is filed as an exhibit hereto, pursuant to which specified motor vehicle retail installment sale contracts and related property will be sold by CarMax Business Services to the Depositor. On the Issuance Date, the Issuing Entity, the Grantor Trust, the Depositor and CarMax Business Services, as servicer (the “Servicer”), will enter into a Sale and Servicing Agreement, in substantially the form of which is filed as an exhibit hereto, pursuant to which motor vehicle retail installment sale contracts and related property will be transferred by the Depositor to the Issuing Entity, and the Issuing Entity and the Grantor Trust will engage CarMax Business Services to service those assets. On the Issuance Date, the Issuing Entity and the Grantor Trust will enter into a Receivables Contribution Agreement, in substantially the form of which is filed as an exhibit hereto, pursuant to which motor vehicle retail installment sale contracts and related property will be transferred by the Issuing Entity to the Grantor Trust. On the Issuance Date, the Issuing Entity will issue to the Depositor the Notes pursuant to an Indenture, in substantially the form of which is filed as an exhibit hereto, to be entered into between the Issuing Entity, the Grantor Trust and Wilmington Trust, National Association, as indenture trustee (the “Indenture Trustee”). On the Issuance Date, the Issuing Entity, the Grantor Trust, the Indenture Trustee and CarMax Business Services, as administrator, will enter into an Administration Agreement, in substantially the form of which is filed as an exhibit hereto, pursuant to which the administrator agrees to perform certain duties and obligations of the Issuing Entity, the Grantor Trust, the Owner Trustee and the Grantor Trust Trustee under the transaction documents. On the Issuance Date, the Issuing Entity, the Grantor Trust, the Servicer and Clayton Fixed Income Services LLC, as asset representations reviewer (the “Asset Representations Reviewer”), will enter into an Asset Representations Review Agreement, in substantially the form of which is filed as an exhibit hereto, pursuant to which the Asset Representations Reviewer will agree to perform, upon satisfaction of certain trigger events, reviews of certain receivables for compliance with the representations and warranties made by CarMax Business Services and the Depositor about such receivables.

Legal opinions and a consent of Mayer Brown LLP are attached as Exhibit 5.1 and Exhibit 8.1. A legal opinion and consent of Richards, Layton & Finder, P.A., is attached as Exhibit 5.2.

In connection with the offering of the Offered Notes, the chief executive officer of the Registrant has made the certifications required by Paragraph I.B.1(a) of Form SF-3 attached as Exhibit 36.1. The certification is being filed on this Current Report to satisfy the requirements of Item 601(b)(36) of Regulation S-K.

Item 9.01.

Financial Statements and Exhibits.


Exhibit No.		Description

1.1		Underwriting Agreement, dated as of September 17, 2025, by and among CarMax Business Services, LLC, as servicer, CarMax Auto Funding LLC, as depositor, and J.P. Morgan Securities LLC, as representative of the several underwriters named therein.

4.1		Indenture, to be dated September 1, 2025, between CarMax Select Receivables Trust 2025-B, CarMax Select Receivables Grantor Trust 2025-B and Wilmington Trust, National Association, as indenture trustee.

4.2		Amended and Restated Trust Agreement, to be dated September 1, 2025, between CarMax Auto Funding LLC, as depositor, and U.S. Bank Trust National Association, as owner trustee.

4.3		Amended and Restated Grantor Trust Agreement, to be dated September 1, 2025, between CarMax Select Receivables Trust 2025-B, as grantor trust seller, and U.S. Bank Trust National Association, as grantor trust trustee.

5.1		Opinion of Mayer Brown LLP, dated as of September 19, 2025, with respect to enforceability of securities.

5.2		Opinion of Richards, Layton & Finger, P.A. dated as of September 19, 2025, with respect to enforceability of the Grantor Trust Certificate.

8.1		Opinion of Mayer Brown LLP, dated as of September 19, 2025, with respect to tax matters.

23.1		Consent of Mayer Brown LLP (included as part of Exhibit 5.1 and Exhibit 8.1).

23.2		Consent of Richards, Layton & Finger, P.A. (included as part of Exhibit 5.2).

36.1		Depositor CEO Certification

99.1		Sale and Servicing Agreement, to be dated September 1, 2025, among CarMax Business Services, LLC, as servicer, CarMax Auto Funding LLC, as depositor, CarMax Select Receivables Trust 2025-B and CarMax Select Receivables Grantor Trust 2025-B.

99.2		Receivables Purchase Agreement, to be dated September 1, 2025, between CarMax Business Services, LLC, as seller, and CarMax Auto Funding LLC, as purchaser.

99.3		Receivables Contribution Agreement, to be dated September 1, 2025, between CarMax Select Receivables Trust 2025-B, as issuer, and CarMax Select Receivables Grantor Trust 2025-B, as grantor trust.

99.4		Administration Agreement, to be dated September 1, 2025, among CarMax Business Services, LLC, as administrator, CarMax Select Receivables Trust 2025-B, CarMax Select Receivables Grantor Trust 2025-B and Wilmington Trust, National Association, as indenture trustee.

99.5		Asset Representations Review Agreement, to be dated September 1, 2025, among CarMax Select Receivables Trust 2025-B, CarMax Select Receivables Grantor Trust 2025-B, CarMax Business Services, LLC, as servicer, and Clayton Fixed Income Services LLC, as asset representations reviewer.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the depositor has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	CarMax Auto Funding LLC (Depositor)	~~CarMax Auto Funding LLC (Depositor)~~
Dated: July 23, 2025		By:	/s/ Greg Dostich
Dated: September 19, 2025	By:	/s/ Greg Dostich
	Name:	~~Name:~~Greg Dostich	~~Greg Dostich~~
	Title:	~~Title:~~Vice President and Treasurer	~~Vice President and Treasurer~~

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