Clearfield: ACK Asset Management 5.13% Stake

Clearfield, Inc. reports a Schedule 13G showing ACK Asset Management LLC and its managing members beneficially own 710,200 shares of Common Stock, representing 5.13% of the class.

Rhea-AI Filing Summary

Clearfield, Inc. reports a Schedule 13G showing ACK Asset Management LLC and its managing members beneficially own 710,200 shares of Common Stock, representing 5.13% of the class. The filing states ACK has shared voting and dispositive power over these shares and that ACK and the named managing members disclaim beneficial ownership. The filing is signed on 04/15/2026.

Insights

Shareholder Relations Analyst

ACK reports a passive 5.13% position via shared voting/dispositive power.

ACK Asset Management LLC, together with managing members Richard Meisenberg and John Reilly, are reported as having shared voting and shared dispositive power over 710,200 shares. The filing is presented on a Schedule 13G, which typically signals a passive investing intent under SEC rules.

Because the filing disclaims direct ownership and classifies the position as shared power, subsequent filings (e.g., a Schedule 13D) would be required if activism or acquisition intent changes. The signature date is 04/15/2026.

Corporate Governance Advisor

Position size (5.13%) is material enough for disclosure but below typical activist thresholds.

The reported 5.13% holding obligates public disclosure under Section 13 rules and gives ACK visibility with management while remaining a non-controlling stake. Shared voting power of 710,200 shares is the operative control metric in the filing.

Monitor future SEC schedules for any change in classification or additional share movements; any shift to active intent would likely be reflected by an amendment or a Schedule 13D filing.

Key Figures

Shares beneficially owned: 710,200 shares Percent of class: 5.13% Filing signature date: 04/15/2026 +1 more

4 metrics

Shares beneficially owned 710,200 shares Amount reported as beneficially owned

Percent of class 5.13% Percent of shares outstanding reported

Filing signature date 04/15/2026 Date the Schedule 13G was signed

CUSIP 18482P103 Clearfield Common Stock CUSIP

Key Terms

Schedule 13G, beneficially own, shared dispositive power, Rule 13d-3

4 terms

Schedule 13G regulatory

"Schedule 13G showing ACK Asset Management LLC and its managing members"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially own regulatory

"each of ACK, Mr. Meisenberg and Mr. Reilly may be deemed to beneficially own 710,200 Shares"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

shared dispositive power regulatory

"Shared Dispositive Power 710,200.00"

Rule 13d-3 regulatory

"By reason of the provisions of Rule 13d-3 of the Securities Exchange Act"

Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.

FAQ

What stake does ACK Asset Management hold in Clearfield (CLFD)?

ACK Asset Management, with managing members Richard Meisenberg and John Reilly, beneficially owns 710,200 shares, representing 5.13% of Clearfield's common stock as reported.

Does the Schedule 13G for CLFD indicate active control or activism?

The Schedule 13G classification generally indicates a passive intent. The filing reports shared voting and dispositive power but does not state activist intentions or plans to control the company.

Who are the individuals named in the CLFD filing?

The filing names Richard Meisenberg and John Reilly as managing members of ACK Asset Management, each reported with shared voting and dispositive power over the 710,200 shares.

When was the Schedule 13G for CLFD signed?

The Schedule 13G is signed and dated 04/15/2026 by Andres Aguirre (CCO), Richard Meisenberg, and John Reilly, per the signature block in the filing.

What voting and disposition powers are reported for the CLFD shares?

The filing reports 0 sole voting power and 710,200 shared voting power; similarly, 0 sole dispositive power and 710,200 shared dispositive power.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/15/2026 - 01:07 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Clearfield, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

18482P103

(CUSIP Number)

02/20/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 18482P103

1

Names of Reporting Persons

ACK Asset Management LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 710,200.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 710,200.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

710,200.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.1 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 18482P103

1

Names of Reporting Persons

Richard Meisenberg

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 710,200.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 710,200.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

710,200.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 18482P103

1

Names of Reporting Persons

John Reilly

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 71,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 710,200.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

710,200.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Clearfield, Inc.
(b)	Address of issuer's principal executive offices: 7050 WINNETKA AVE. N., SUITE 100, BROOKLYN PARK, MINNESOTA, 55428.
Item 2.
(a)	Name of person filing: 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.
(b)	Address or principal business office or, if none, residence: 777 West Putnam Avenue, Suite 300, Greenwich, CT 06830
(c)	Citizenship: ACK is a Delaware limited liability company. Mr. Meisenberg and Mr. Reilly are United States citizens.
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 18482P103
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 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.
(b)	Percent of class: 5.13%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 710,200
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 710,200
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99.2.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

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.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

ACK Asset Management LLC

Signature:	Andres Aguirre
Name/Title:	CCO
Date:	04/15/2026

Richard Meisenberg

Signature:	RICHARD MEISENBERG
Name/Title:	Managing Member
Date:	04/15/2026

John Reilly

Signature:	JOHN REILLY
Name/Title:	Managing Member
Date:	04/15/2026