NATURAL ALTERNATIVES INTERNATIONAL INC

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

**FORM 10-K **

For the fiscal year ended June 30, 2026

or

For the transition period from to .

**000-15701 **

(Commission file number)

NATURAL ALTERNATIVES INTERNATIONAL, INC.

(Exact name of registrant as specified in its charter)

Securities registered pursuant to Section 12(g) of the Act: None

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

Indicate by check mark if Natural Alternatives International, Inc. (NAI) is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act of 1933. ☐ Yes ☒No

Indicate by check mark if NAI is not required to file reports pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934. ☐ Yes ☒No

Indicate by check mark whether NAI (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 NAI was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. ☒Yes ☐ No

Indicate by check mark whether NAI has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that NAI was required to submit such files). ☒Yes ☐ No

Indicate by check mark whether NAI is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an 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. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether NAI is a shell company (as defined in Rule 12b-2 of the Exchange Act):☐ Yes ☒ No

The aggregate market value of NAI’s common stock held by non-affiliates of NAI as of the last business day of NAI’s most recently completed second fiscal quarter (December 31, 2025) was approximately $22,113,000 (based on the closing sale price of $3.58 reported by Nasdaq on December 31, 2025).

As of September 28, 2026,6,264,847 shares of NAI’s common stock were outstanding, net of 3,387,059 treasury shares.

DOCUMENTS INCORPORATED BY REFERENCE

Part III (Items 10, 11, 12, 13 and 14) of this Form 10-K incorporates by reference portions of NAI’s definitive proxy statement, to be filed on or before October 28, 2026, for its Annual Meeting of Stockholders to be held December 11, 2026.