Hudson Technologies (HDSN) director adds 10,000 shares in open-market buy

Rhea-AI Filing Summary

Hudson Technologies director Richard Parrillo reported an open-market purchase of the company’s Common Stock. On May 13, 2026, he bought 10,000 shares at an average price of $4.8257 per share. After this transaction, he directly owns 195,746 shares of Hudson Technologies common stock.

Insider Trade Summary

Net Buyer: 10,000 shares ($48,257)

Net Buy 1 txn

Insider Parrillo Richard

Role null

Bought 10,000 shs ($48K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	10,000	$4.8257	$48K

Holdings After Transaction: Common Stock — 195,746 shares (Direct, null)

Footnotes (1)

Key Figures

Shares purchased: 10,000 shares Purchase price: $4.8257 per share Post-transaction holdings: 195,746 shares

3 metrics

Shares purchased 10,000 shares Open-market purchase on May 13, 2026

Purchase price $4.8257 per share Average price for the 10,000-share buy

Post-transaction holdings 195,746 shares Total Common Stock directly owned after the trade

Key Terms

Common Stock, open-market purchase, Form 4/A

3 terms

Common Stock financial

"security_title: Common Stock reported in the insider transaction"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

open-market purchase financial

"transaction_action: open-market purchase in the Form 4/A data"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Form 4/A regulatory

"Amended Form 4 (Form 4/A) insider trading report data"

Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.

Form 4 Insider Transactions: What Each Field Means →

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^*

Parrillo Richard

(Last) (First) (Middle)

C/O HUDSON TECHNOLOGIES, INC.

300 TICE BOULEVARD, SUITE 290

(Street)

WOODCLIFF LAKE NEW JERSEY 07677

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/13/2026

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)
05/15/2026

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	05/13/2026		P		10,000	A	$4.8257	195,746	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:

Remarks:

Amends and restates Form 4 filed on May 15, 2026 to correct software error.

	/s/ Richard Parrillo	05/21/2026
	** 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)

FAQ

What insider transaction did Hudson Technologies (HDSN) report in this Form 4/A?

Hudson Technologies reported that director Richard Parrillo made an open-market purchase of 10,000 shares of Common Stock. The transaction took place on May 13, 2026, and was filed as a Form 4/A insider trading report.

How many Hudson Technologies (HDSN) shares did Richard Parrillo buy and at what price?

Richard Parrillo bought 10,000 shares of Hudson Technologies Common Stock at an average price of $4.8257 per share. This was an open-market purchase executed on May 13, 2026, as disclosed in the amended Form 4 filing.

What are Richard Parrillo’s Hudson Technologies (HDSN) holdings after this transaction?

Following the reported purchase, Richard Parrillo directly owns 195,746 shares of Hudson Technologies Common Stock. This total reflects his position after acquiring 10,000 additional shares on May 13, 2026, in an open-market transaction.

Was the Hudson Technologies (HDSN) insider transaction a buy or a sell?

The transaction was a buy. Director Richard Parrillo executed an open-market purchase of 10,000 shares of Hudson Technologies Common Stock at an average price of $4.8257 per share, increasing his direct ownership stake in the company.

What type of security did the Hudson Technologies (HDSN) insider purchase?

The insider transaction involved Hudson Technologies Common Stock. Director Richard Parrillo purchased 10,000 shares in the open market at an average price of $4.8257 per share, as reported in the company’s Form 4/A filing.