What SEC filings does Hudson Technologies, Inc. submit to the SEC?

Hudson Technologies, Inc. (HDSN) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about HDSN?

A Form 4 for HDSN discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Hudson Technologies, Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for HDSN?

The 10-K is Hudson Technologies, Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all HDSN SEC filings directly on EDGAR?

You can view all historical Hudson Technologies, Inc. filings on the SEC EDGAR company page for HDSN. Each filing card on this page links directly to the original SEC document.

How often does Hudson Technologies, Inc. file with the SEC?

Hudson Technologies, Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling HDSN shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

HDSN SEC Filing News — Hudson Technologies, Inc.

Latest SEC filings for Hudson Technologies, Inc. (HDSN) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-28.

Hudson Technologies, Inc., through its subsidiary, Hudson Technologies Company, provides solutions to recurring problems within the refrigeration industry in the United States. The company offers refrigerant and industrial gas; refrigerant management services comprising primarily of reclamation of refrigerants, laboratory testing through its laboratory, and banking storage services; and RefrigerantSide Services comprising system decontamination to remove moisture, oils, and other contaminants in…

Sector: Basic Materials Industry: Specialty Chemicals Market Cap: $210.9M CIK: 925528

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for HDSN currently lean bullish. Of the 20 displayed SEC filing records, 10 carry bullish classifications versus 0 bearish classifications. These labels summarize filing attributes; they are not recommendations, probabilities, or evidence of future price direction. There were 10 insider transactions (Form 4) in this period.

HDSN Filing Activity Snapshot 2026-05-06 — 2026-09-28

Insider Transactions (Form 4)

10 buys vs 0 sells

Net insider buying in this period — more purchases than sales reported.

Largest Form 144 Filing

$604.4K

Hartree Partners, LP (10% Owner) · 2026-09-28

118,549 shares · Form 4

Insider Transactions 10 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 10 filings in this group are Form 4s for Hudson Technologies, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 10 insider filings shown, the breakdown is 10 open-market purchase. 10 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market purchase ×10: The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Form 4 Open-market purchase Insider Buying 2026-09-28

HDSN insider Hartree Partners, LP (10% Owner) bought 118,549 shares (~$604.4K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 118,549 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	118,549	$5.10	$604.4K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 118,549 Est. Value: $604.4K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-09-23

HDSN insider Hartree Partners, LP (10% Owner) bought 13,515 shares (~$68.9K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 13,515 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	2,502	$5.10	$12.8K
`P`	Open-market purchase	11,013	$5.10	$56.2K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 13,515 Est. Value: $68.9K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-09-18

HDSN insider Hartree Partners, LP (10% Owner) bought 11,136 shares (~$56.8K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 11,136 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	11,136	$5.10	$56.8K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 11,136 Est. Value: $56.8K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-09-04

HDSN insider Hartree Partners, LP (10% Owner) bought 5,317 shares (~$27.1K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 5,317 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	5,317	$5.10	$27.1K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 5,317 Est. Value: $27.1K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-08-26

HDSN insider Hartree Partners, LP (10% Owner) bought 100,612 shares (~$553.0K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 100,612 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	9,446	$5.50	$52.0K
`P`	Open-market purchase	91,166	$5.50	$501.1K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 100,612 Est. Value: $553.0K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-08-14

HDSN insider Hartree Partners, LP (10% Owner) bought 5,198 shares (~$28.6K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 5,198 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	5,198	$5.50	$28.6K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 5,198 Est. Value: $28.6K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-07-31

HDSN insider Hartree Partners, LP (10% Owner) bought 52,104 shares (~$312.1K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 52,104 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	52,104	$5.99	$312.1K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 52,104 Est. Value: $312.1K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-07-22

HDSN insider Hartree Partners, LP (10% Owner) bought 65,550 shares (~$392.6K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 65,550 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	17,842	$5.99	$106.9K
`P`	Open-market purchase	47,708	$5.99	$285.7K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 65,550 Est. Value: $392.6K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-07-08

HDSN insider Hartree Partners, LP (10% Owner) bought 5,234 shares (~$31.4K)

Hartree Partners, LP, listed as 10% Owner at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 5,234 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	4,634	$5.99	$27.8K
`P`	Open-market purchase	600	$5.99	$3.6K

Filing: Form 4 (Insider Transaction) Insider: Hartree Partners, LP (10% Owner) Shares: 5,234 Est. Value: $31.4K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2026-05-15

HDSN insider Gaglione Kenneth (Director, President and CEO) bought 5,000 shares (~$24.5K)

Gaglione Kenneth, listed as Director, President and CEO at HUDSON TECHNOLOGIES INC /NY, reported an open-market purchase of 5,000 HDSN shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	5,000	$4.89	$24.5K

Filing: Form 4 (Insider Transaction) Insider: Gaglione Kenneth (Director, President and CEO) Shares: 5,000 Est. Value: $24.5K

View on SEC EDGAR → Open Filing Document →

Material Events 8 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 8 in this period for Hudson Technologies, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-06

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-08-05

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-06-12

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-06-11

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-28

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-20

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-18

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-06

HDSN filed 8-K — material company event

HUDSON TECHNOLOGIES INC /NY filed an 8-K with the SEC reporting a material event. Read the SEC filing for the full details.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 2 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 2 quarterly reports (10-Q) for Hudson Technologies, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-07

HDSN filed Quarterly Report (10-Q)

HUDSON TECHNOLOGIES INC /NY filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

Form 10-Q Quarterly Report 2026-05-11

HDSN filed Quarterly Report (10-Q)

HUDSON TECHNOLOGIES INC /NY filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

How we classify Hudson Technologies, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on HDSN. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — HDSN SEC Filings

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HDSN Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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