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Houghton Kathleen

Disclosed activity across 1 company

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69571
SEC CIK
0001824104

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
HUDSON TECHNOLOGIES INC /NYHDSN · Entity 6244Director · Sr. VP-Sales and MarketingJanuary 08, 2026January 12, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

HUDSON TECHNOLOGIES INC /NY

Report date January 08, 2026 · Filed January 12, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect158,618 Ending reported balance After 2026-01-08 transaction · row 6
6 source rows · reconciled sequence

Row 1 · 2026-01-08 · Exercise / conversion · Acquired 120,000 · Balance 161,163

Row 2 · 2026-01-08 · Tax withholding · Disposed 44,873 · Balance 116,290

Row 3 · 2026-01-08 · Exercise / conversion · Acquired 47,619 · Balance 163,909

Row 4 · 2026-01-08 · Tax withholding · Disposed 21,797 · Balance 142,112

Row 5 · 2026-01-08 · Exercise / conversion · Acquired 50,888 · Balance 193,000

Row 6 · 2026-01-08 · Tax withholding · Disposed 34,382 · Balance 158,618

Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $0.75 · Expires 2029-12-19Direct0 Reported balance After 2026-01-08 transaction · row 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · 2026-01-08 · Exercise / conversion · Disposed 120,000 · Balance 0

Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $1.60 · Expires 2026-03-12Direct0 Reported balance After 2026-01-08 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2026-01-08 · Exercise / conversion · Disposed 47,619 · Balance 0

Stock OptionSEC Table II · derivative / convertible security · Conversion / exercise price $3.81 · Expires 2027-02-24Direct0 Reported balance After 2026-01-08 transaction · row 9 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 9 · 2026-01-08 · Exercise / conversion · Disposed 50,888 · Balance 0

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionStock Option · Derivative 50,888 $0.00 Strike: $3.81 $0.00
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · derivative · entry 9

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 50,888 shares

Expires 2027-02-24

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionStock Option · Derivative 47,619 $0.00 Strike: $1.60 $0.00
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · derivative · entry 8

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 47,619 shares

Expires 2026-03-12

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionStock Option · Derivative 120,000 $0.00 Strike: $0.75 $0.00
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · derivative · entry 7

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 120,000 shares

Expires 2029-12-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Tax withholdingCommon Stock 34,382 $7.10 $244,112.20
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · nonDerivative · entry 6

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 158,618

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionCommon Stock 50,888 $3.81 $193,883.28
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · nonDerivative · entry 5

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 193,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Tax withholdingCommon Stock 21,797 $7.10 $154,758.70
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · nonDerivative · entry 4

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 142,112

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionCommon Stock 47,619 $1.60 $76,190.40
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · nonDerivative · entry 3

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 163,909

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Tax withholdingCommon Stock 44,873 $7.10 $318,598.30
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · nonDerivative · entry 2

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 116,290

Read SEC document
January 08, 2026 Filed Jan 12, 2026 19:51 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionCommon Stock 120,000 $0.75 $90,000.00
Disclosure

SEC source: 0000925528-26-000002 · form4.xml · nonDerivative · entry 1

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 161,163

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
March 13, 2025 Filed Mar 17, 2025 20:06 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 GrantStock Option · Derivative 72,477 $0.00 Strike: $5.95 $0.00
Disclosure

SEC source: 0001062993-25-005571 · form4.xml · derivative · entry 1

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,477

Underlying: Common Stock · 72,477 shares

Expires 2030-03-13

F1 · derivative.exercise_date: Vests on December 31, 2027 dependent upon achievement of stock price and earnings per share targets.

Read SEC document
February 27, 2024 Filed Feb 28, 2024 21:21 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 GrantStock option · Derivative 9,444 $0.00 Strike: $14.89 $0.00
Disclosure

SEC source: 0001062993-24-004763 · form4.xml · derivative · entry 1

Houghton Kathleen · CIK 0001824104 · Director · Sr. VP-Sales and Marketing

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,444

Underlying: Common Stock · 9,444 shares

Expires 2027-02-27

F1 · derivative.exercise_date: Options vest 50% on date of grant and 50% on first anniversary of date of grant.

Read SEC document
March 01, 2023 Filed Mar 3, 2023 19:42 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 GrantStock option · Derivative 66,757 $0.00 Strike: $10.09 $0.00
Disclosure

SEC source: 0001062993-23-005815 · form4.xml · derivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP-Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,757

Underlying: Common Stock · 66,757 shares

Expires 2026-03-01

F1 · derivative.exercise_date: (1) Options vest 50% on date of grant and 50% on first anniversary of date of grant.

Read SEC document
February 24, 2022 Filed Feb 28, 2022 16:30 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 GrantStock Option · Derivative 50,888 $0.00 Strike: $3.81 $0.00
Disclosure

SEC source: 0001062993-22-005832 · form4.xml · derivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP-Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,888

Underlying: Common Stock · 50,888 shares

Expires 2027-02-24

F1 · derivative.exercise_date: Options vest 50% on date of grant and 50% on first anniversary of date of grant./s

Read SEC document
February 03, 2022 Filed Feb 4, 2022 19:28 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionStock Option · Derivative 20,000 $0.00 Strike: $1.25 $0.00
Disclosure

SEC source: 0001062993-22-002614 · form4.xml · derivative · entry 3

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,000 shares

Expires 2022-02-20

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
February 03, 2022 Filed Feb 4, 2022 19:28 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Tax withholdingCommon Stock 12,259 $3.73 $45,726.07
Disclosure

SEC source: 0001062993-22-002614 · form4.xml · nonDerivative · entry 2

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,848

Read SEC document
February 03, 2022 Filed Feb 4, 2022 19:28 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionCommon Stock 20,000 $1.25 $25,000.00
Disclosure

SEC source: 0001062993-22-002614 · form4.xml · nonDerivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,107

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
June 09, 2021 Filed Jun 11, 2021 13:14 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 9,100 $2.89 $26,299.00
Disclosure

SEC source: 0001449374-21-000030 · edgar.xml · nonDerivative · entry 7

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,107

Read SEC document
June 09, 2021 Filed Jun 11, 2021 13:14 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 200 $2.90 $579.00
Disclosure

SEC source: 0001449374-21-000030 · edgar.xml · nonDerivative · entry 6

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,207

Read SEC document
June 09, 2021 Filed Jun 11, 2021 13:14 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 700 $2.90 $2,030.00
Disclosure

SEC source: 0001449374-21-000030 · edgar.xml · nonDerivative · entry 5

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,407

Read SEC document
June 09, 2021 Filed Jun 11, 2021 13:14 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 2,015 $2.92 $5,883.80
Disclosure

SEC source: 0001449374-21-000030 · edgar.xml · nonDerivative · entry 4

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,107

Read SEC document
June 09, 2021 Filed Jun 11, 2021 13:14 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 100 $2.93 $293.00
Disclosure

SEC source: 0001449374-21-000030 · edgar.xml · nonDerivative · entry 3

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,122

Read SEC document
June 09, 2021 Filed Jun 11, 2021 13:14 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 1,000 $2.93 $2,930.10
Disclosure

SEC source: 0001449374-21-000030 · edgar.xml · nonDerivative · entry 2

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,222

Read SEC document
June 09, 2021 Filed Jun 11, 2021 13:14 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 200 $2.93 $586.20
Disclosure

SEC source: 0001449374-21-000030 · edgar.xml · nonDerivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,222

Read SEC document
June 09, 2021 Filed Feb 7, 2023 21:41 UTC Amendment HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 1,094 $2.95 $3,227.30
Disclosure

SEC source: 0001062993-23-002371 · form4a.xml · nonDerivative · entry 3

Houghton Kathleen · CIK 0001824104 · VP-Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,163

F1 · shares: (1) The reporting person is amending the Form 4 originally filed with respect to a series of sales reported on one trading day to add transactions inadvertently omitted from the original filing.

F2 · balance_after: (2) Represents amount of common stock owned on the date of this filing.

Read SEC document
June 09, 2021 Filed Feb 7, 2023 21:41 UTC Amendment HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 2,701 $2.96 $7,994.96
Disclosure

SEC source: 0001062993-23-002371 · form4a.xml · nonDerivative · entry 2

Houghton Kathleen · CIK 0001824104 · VP-Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,257

F1 · shares: (1) The reporting person is amending the Form 4 originally filed with respect to a series of sales reported on one trading day to add transactions inadvertently omitted from the original filing.

Read SEC document
June 09, 2021 Filed Feb 7, 2023 21:41 UTC Amendment HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 2,890 $2.97 $8,583.30
Disclosure

SEC source: 0001062993-23-002371 · form4a.xml · nonDerivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP-Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,958

F1 · shares: (1) The reporting person is amending the Form 4 originally filed with respect to a series of sales reported on one trading day to add transactions inadvertently omitted from the original filing.

Read SEC document
June 03, 2021 Filed Jun 7, 2021 20:53 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionStock Option · Derivative 125,000 $0.00 Strike: $1.09 $0.00
Disclosure

SEC source: 0001449374-21-000028 · edgar.xml · derivative · entry 3

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 125,000 shares

Expires 2021-11-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
June 03, 2021 Filed Jun 7, 2021 20:53 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Tax withholdingCommon Stock 71,578 $3.09 $221,176.02
Disclosure

SEC source: 0001449374-21-000028 · edgar.xml · nonDerivative · entry 2

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,422

Read SEC document
June 03, 2021 Filed Jun 7, 2021 20:53 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionCommon Stock 125,000 $1.09 $136,250.00
Disclosure

SEC source: 0001449374-21-000028 · edgar.xml · nonDerivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
June 02, 2021 Filed Jun 2, 2021 18:39 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 1,300 $3.00 $3,893.50
Disclosure

SEC source: 0001449374-21-000022 · edgar.xml · nonDerivative · entry 4

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Read SEC document
June 02, 2021 Filed Jun 2, 2021 18:39 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 SaleCommon Stock 2,282 $3.00 $6,846.00
Disclosure

SEC source: 0001449374-21-000022 · edgar.xml · nonDerivative · entry 3

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,300

Read SEC document
May 28, 2021 Filed Jun 2, 2021 18:39 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionStock Option · Derivative 30,000 $0.00 Strike: $2.31 $0.00
Disclosure

SEC source: 0001449374-21-000022 · edgar.xml · derivative · entry 5

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 30,000 shares

Expires 2021-06-08

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
May 28, 2021 Filed Jun 2, 2021 18:39 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Tax withholdingCommon Stock 26,418 $2.82 $74,498.76
Disclosure

SEC source: 0001449374-21-000022 · edgar.xml · nonDerivative · entry 2

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,582

Read SEC document
May 28, 2021 Filed Jun 2, 2021 18:39 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 Exercise / conversionCommon Stock 30,000 $2.31 $69,300.00
Disclosure

SEC source: 0001449374-21-000022 · edgar.xml · nonDerivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
March 12, 2021 Filed Mar 16, 2021 17:24 UTC HUDSON TECHNOLOGIES INC /NY HDSN · Entity 6244 GrantStock Option · Derivative 47,619 $0.00 Strike: $1.60 $0.00
Disclosure

SEC source: 0001449374-21-000012 · edgar.xml · derivative · entry 1

Houghton Kathleen · CIK 0001824104 · VP - Sales and Marketing

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,619

Underlying: Common Stock · 47,619 shares

Expires 2026-03-12

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.