UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-D

ASSET-BACKED ISSUER

DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the distribution period from

December 1, 2025 to December 31, 2025

Commission File Number of issuing entity: 333-166301-14

Central Index Key of issuing entity: 1582081

SLM STUDENT LOAN TRUST 2013-4

(Exact name of issuing entity as specified in its charter)

Commission File Number of depositor: 333-166301

Central Index Key of depositor: 0000949114

NAVIENT FUNDING, LLC

(Exact name of depositor as specified in its charter)

Central Index Key of sponsor: 0001601725

NAVIENT SOLUTIONS, LLC

(Exact name of sponsor as specified in its charter)

Mai Le-Cao (571) 592-8608

(Name and telephone number, including area code, of the person to contact in connection with this filing)

Delaware

(State or other jurisdiction of

incorporation or organization of the

issuing entity)

04-3480392

54-1843973

(I.R.S. Employer Identification Nos.)

c/o Deutsche Bank Trust Company Delaware

111 Continental Drive, Suite 102

Newark, Delaware

19713

(Zip Code)

(Address of principal executive offices

of issuing entity)

(571) 592-8608

(Telephone number including area code)

Not Applicable

(Former name, former address, if changed since last report)

Registered/reporting pursuant to (check one)

Title of class	Section 12(b)	Section 12(g)	Section 15(d)	Name of exchange (If Section 12(b))

Class A Student Loan Backed Notes	☐	☐	☑
Class B Student Loan Backed Notes	☐	☐	☑

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes ☑ No ☐

PART I — DISTRIBUTION INFORMATION

Item 1.

Distribution and Pool Performance Information.

On January 26, 2026, SLM Student Loan Trust 2013-4 (the “Trust”) made its regular monthly distribution of funds to holders of its Student Loan-Backed Notes. Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as the administrator, distributed the Monthly Distribution Report for the Trust for the period identified on the cover of this Form 10-D to the Indenture Trustee, on behalf of the Trust’s noteholders of record. This Monthly Distribution Report is attached to this Report as Exhibit 99.1. This report as well as other information about the Trust is also available on the Administrator’s website at http://www.navient.com/about/investors/debtasset/slmsltrusts/. There is no activity to report under Rule 15Ga-1(a) under the Securities Exchange Act of 1934 with respect to the Trust for the distribution period referred to in the second sentence of this paragraph. The depositor of the Trust filed its most recent report on Form ABS-15G on February 7, 2025 (such report is available at www.sec.gov under the depositor’s CIK No. 0000949114).

PART II — OTHER INFORMATION

Item 2.

Legal Proceedings.

Navient Corporation (“Navient”) has been named as defendant in a number of putative class action and other cases alleging violations of various state and federal consumer protection laws including the Telephone Consumer Protection Act, the Consumer Financial Protection Act of 2010 (CFPA), the Fair Credit Reporting Act (FCRA), the Fair Debt Collection Practices Act (FDCPA), in adversarial proceedings under the United States Bankruptcy Code, and various state consumer protection laws. At this point in time, Navient is unable to anticipate the timing of a resolution or the impact that these legal proceedings may have on its consolidated financial position, liquidity, results of operation or cash flows. As a result, it is not possible at this time to estimate a range of potential exposure, if any, for amounts that may be payable in connection with these matters and loss contingency accruals have not been established. It is possible that an adverse ruling or rulings may have a material adverse impact on Navient, Navient Solutions and/or their affiliates or on the financial ability of the depositor, the servicer or a seller to fulfill an obligation to purchase or repurchase trust student loans in connection with a breach of representation, warranty or covenant.

Item 3.

Sales of Securities and Use of Proceeds. None.

Item 4.

Defaults Upon Senior Securities. None.

Item 5.

Submission of Matters to a Vote of Security Holders. None.

Item 6.

Significant Obligors of Pool Assets. No updates to report.

Item 7.

Change in Sponsor Interest in the Securities. None.

Item 8.

Significant Enhancement Provider Information. No updates to report.

Item 9.

Other Information. None.

Item 10.

Exhibits.

(a)

99.1 Monthly Distribution Report for SLM Student Loan Trust 2013-4 in relation to the distribution for January 2026.

SIGNATURES

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

Dated: February 6, 2026	SLM STUDENT LOAN TRUST 2013-4

	By:	NAVIENT SOLUTIONS, LLC, the Administrator

	By:	/s/ MAI LE-CAO
	Name:	Mai Le-Cao
	Title:	Managing Director

INDEX TO EXHIBITS

Exhibit Number		Exhibit

99.1		Monthly Distribution Report for SLM Student Loan Trust 2013-4 in relation to the distribution for January 2026.

SLM Student Loan Trust 2013-4 10-D