Calm Waters Partnership SC 13G/AHUDSON / CALM WATERS PARTNERSHIP ownership change

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

£ Rule 13d-1(b)

x Rule 13d-1(c)

£ Rule 13d-1(d)

^*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Item 1.

(a)

Name of Issuer:

Hudson Technologies, Inc.

(b)

Address of Issuer’s Principal Executive Offices:

One Blue Hill Plaza, 14^th Floor

P.O. Box 1541

Pearl River, New York  10965

Item 2.

(a)

Name of Persons Filing:

Calm Waters Partnership

Richard S. Strong

(b)

Address of Principal Business Office:

All reporting persons may be contacted at:

c/o Godfrey & Kahn, S.C.

833 East Michigan Street, Suite 1800

Milwaukee, WI 53202

(c)

Citizenship:

Calm Waters Partnership is a Wisconsin general partnership.

Richard S. Strong is a United States citizen.

(d)

Title of Class of Securities:

Common Stock, Par Value $0.01 per Share

(e)

CUSIP Number:

444144109

Item 3.

If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or 240.13d-2(c), check whether the person filing is a(n):

Not applicable.

Item 4.

Ownership

(a)

Amount beneficially owned:

See responses to Item 9 of the cover pages.

(b)

Percent of Class:

See responses to Item 11 of the cover pages.

(c)

For information on voting and dispositive power with respect to the above listed shares, see Items 5-9 on the Cover Pages.

Item 5.

Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ X ].

Item 6.

Ownership of More than Five 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.

Not applicable.

Item 8.

Identification and Classification of Members of the Group.

Not applicable.

Item 9.

Notice of Dissolution of Group.

Not applicable.

Item 10.

Certification.

By signing below, I certify that, to the best of my knowledge and belief, the securities referred to above 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.

CALM WATERS PARTNERSHIP

Richard S. Strong

Richard S. Strong

Managing Partner

1

Joint Filing Agreement  (incorporated by reference to Exhibit 1 of the Reporting Persons’ Schedule 13G filed with the SEC on July 1, 2021)