Hartree Partners (HDSN) adds to Hudson Technologies stake with open-market buy

Rhea-AI Filing Summary

Hartree Partners, LP, a 10% owner of Hudson Technologies Inc. (HDSN), reported an open-market purchase of 5,198 shares of common stock on 2026-08-12 at $5.50 per share. Following this transaction, Hartree Partners, LP reported holding 5,099,388 shares of Hudson Technologies common stock. Hartree Partners, LP disclaims beneficial ownership of these securities except to the extent of its pecuniary interest.

Insider Trade Summary

Net Buyer: 5,198 shares

Net Buy 1 txn

Insider Hartree Partners, LP

Role 10% Owner

Bought 5,198 shs ($29K)

Type	Security	Shares	Price	Value
Purchase	Common Stock, par value $0.01 F1	5,198	$5.50	$29K

Holdings After Transaction: Common Stock, par value $0.01 — 5,099,388 shares (Direct)

Footnotes (1)

1. F1. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein, and this report shall not be deemed to be an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

Key Figures

Shares purchased: 5,198 shares Purchase price: $5.50 per share Shares owned after transaction: 5,099,388 shares +1 more

4 metrics

Shares purchased 5,198 shares Common stock purchased on 2026-08-12

Purchase price $5.50 per share Price for the 5,198-share common stock purchase

Shares owned after transaction 5,099,388 shares Total Hudson Technologies common shares reported following the trade

Net buy shares 5,198 shares Net shares bought in this Form 4, all from a single purchase

Key Terms

ten percent owner, beneficial ownership, pecuniary interest, Section 16

4 terms

ten percent owner regulatory

"Hartree Partners, LP, a ten percent owner of Hudson Technologies Inc."

beneficial ownership regulatory

"disclaims beneficial ownership of the securities reported herein except to the extent"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of its pecuniary interest therein, and this report shall not"

Section 16 regulatory

"beneficial owner of such securities for purposes of Section 16 or for any other"

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

FAQ

What transaction did Hartree Partners, LP report on Form 4 for HDSN?

Hartree Partners, LP reported a purchase of 5,198 shares of Hudson Technologies common stock. The transaction occurred on 2026-08-12 and is coded as a “P” open-market or private purchase under Section 16 reporting rules.

At what price did Hartree Partners, LP buy Hudson Technologies (HDSN) shares?

Hartree Partners, LP bought the 5,198 HDSN shares at a price of $5.50 per share. This reflects the per-share purchase price reported for the open-market or private transaction on 2026-08-12 in the Form 4 filing.

How many Hudson Technologies (HDSN) shares does Hartree Partners, LP hold after this trade?

After the reported purchase, Hartree Partners, LP holds 5,099,388 shares of Hudson Technologies common stock. This figure represents the total shares following the transaction as disclosed in the Form 4 ownership table.

Is Hartree Partners, LP considered a 10% owner of Hudson Technologies (HDSN)?

Yes. Hartree Partners, LP is identified as a ten percent owner of Hudson Technologies Inc. in the Form 4. This status triggers Section 16 reporting obligations for its transactions in the company’s equity securities.

Does Hartree Partners, LP claim full beneficial ownership of the reported HDSN shares?

No. Hartree Partners, LP disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest. The filing specifies that this disclaimer applies for Section 16 and other purposes.

Was the Hudson Technologies (HDSN) trade by Hartree Partners, LP under a Rule 10b5-1 plan?

The Form 4 indicates the Rule 10b5-1 checkbox is not affirmatively marked. There is no explicit statement in the filing that this 5,198-share purchase at $5.50 per share was made under a Rule 10b5-1 trading plan.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/14/2026 - 05:11 PM Accepted by SEC EDGAR 08/14/2026 - 05:10 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Hartree Partners, LP

(Last) (First) (Middle)

1185 AVE OF THE AMERICAS

(Street)

NEW YORK NEW YORK 10036

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
HUDSON TECHNOLOGIES INC /NY [ HDSN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/12/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $0.01(1)	08/12/2026		P		5,198	A	$5.5	5,099,388	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein, and this report shall not be deemed to be an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.

	Hartree Partners, LP, By: /s/ Christine Stevenson, Chief Compliance Officer	08/14/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)