UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 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): April 25, 2026

Clearfield, Inc.

(Exact name of registrant as specified in charter)

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:

☐    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 Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§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. ☐

On April 25, 2026, Clearfield, Inc. (the “Company”) entered into an Amendment No. 3 to Loan Agreement (the “Amendment”) that amends its Loan Agreement dated April 27, 2022 (as amended, the “Agreement”) with Old National Bank, successor by merger to Bremer Bank, National Association. The Amendment, among other things, (i) extends the maturity of the line of credit provided under the Agreement from April 25, 2026 to July 24, 2026, (ii) incorporates updated interest and payment provisions into the Agreement that had previously been included in the promissory note issued under the Agreement, (iii) adds several events that constitute a default under the Agreement, and (iv) adds a jury trial waiver for any judicial proceedings in which the parties are involved which arise out of or are related to the Agreement. The Amendment also contains customary representations and warranties applicable to the Company. All other material terms of the Agreement remain unchanged.

The foregoing summary of the Amendment does not purport to be complete and is subject to and qualified in its entirety by reference to the Amendment, which is attached hereto as Exhibit 10.1 and is incorporated herein by reference.

(d) Exhibits.

SIGNATURES

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