Clearfield, Inc.

3.1 – Restated Articles of Incorporation of APA Optics, Inc. (n/k/a Clearfield, Inc.) dated November 3, 1983, and Articles of Amendment dated December 9, 1983, July 30, 1987, March 22, 1989, September 14, 1994 and August 17, 2000. (Incorporated by reference to Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2000.)

3.1(a) – Articles of Amendment to Articles of Incorporation dated August 25, 2004. (Incorporated by reference to Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2004.)

3.2 – Amended and Restated Bylaws of Clearfield, Inc. (Incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K dated February 26, 2016.)

10.1 – Amendment No. 2 to Loan Agreement dated April 25, 2025, by and between Clearfield, Inc. and Bremer Bank, National Association. (Incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K dated April 25, 2025.)

31.1 – Certification of Chief Executive Officer pursuant to Rules 13a-14(a) and 15d-14(a) of the Exchange Act

31.2 – Certification of Chief Financial Officer pursuant to Rules 13a-14(a) and 15d-14(a) of the Exchange Act

32.1 – Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. §1350

101 – The following materials from Clearfield, Inc.’s Quarterly Report on Form 10-Q for the period ended June 30, 2025 are formatted in iXBRL (Inline eXtensible Business Reporting Language): (i) Condensed Consolidated Balance Sheets at June 30, 2025 and September 30, 2024; (ii) Condensed Consolidated Statements of Earnings for the three and nine months ended June 30, 2025 and 2024; (iii) Condensed Consolidated Statements of Shareholders’ Equity for the three and nine months ended June 30, 2025 and 2024; (iv) Condensed Consolidated Statements of Cash Flows for the nine months ended June 30, 2025 and 2024; and (v) Notes to the Condensed Consolidated Financial Statements.

104 - Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101).

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