X0202 SCHEDULE 13G 0001510940 XXXXXXXX LIVE Common Stock 02/20/2026 0000796505 Clearfield, Inc. 18482P103 7050 WINNETKA AVE. N. SUITE 100 BROOKLYN PARK MN 55428 Rule 13d-1(b) ACK Asset Management LLC b DE 0.00 710200.00 0.00 710200.00 710200.00 5.1 IA Richard Meisenberg X1 0.00 710200.00 0.00 710200.00 710200.00 5.1 HC John Reilly b X1 0.00 71000.00 0.00 710200.00 710200.00 5.1 HC Clearfield, Inc. 7050 WINNETKA AVE. N., SUITE 100, BROOKLYN PARK, MINNESOTA, 55428. ACK Asset Management LLC (ACK) with respect to shares of Common Stock, par value $0.01 (Shares), of the Issuer beneficially owned by certain funds and managed accounts advised by ACK and through ACKs managing members; Richard Meisenberg; and John Reilly. 777 West Putnam Avenue, Suite 300, Greenwich, CT 06830 ACK is a Delaware limited liability company. Mr. Meisenberg and Mr. Reilly are United States citizens. N IA HC 710,200 ACK owns no Shares directly. ACK maintains investment and/or voting power with respect to certain funds and managed accounts advised by it. Mr. Meisenberg and Mr. Reilly are the managing members of ACK and control ACK. By reason of the provisions of Rule 13d-3 of the Securities Exchange Act of 1934, as amended, each of ACK, Mr. Meisenberg and Mr. Reilly may be deemed to beneficially own 710,200 Shares (constituting approximately 5.13% of the Shares outstanding). Each of ACK, Mr. Meisenberg and Mr. Reilly disclaims beneficial ownership of any of the securities covered by this statement. 5.13% 0 710,200 0 710,200 Y N Y N See Exhibit 99.2. Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. ACK Asset Management LLC Andres Aguirre 04/15/2026 Richard Meisenberg RICHARD MEISENBERG 04/15/2026 John Reilly JOHN REILLY 04/15/2026