Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

HUDSON TECHNOLOGIES INC /NY

HDSN · Nasdaq · CIK 0000925528 · Basic Materials · Specialty Chemicals

INSIDER SIGNAL

87.0 / 100

9 buyers · 27 purchase transaction lines · $6.8M gross purchase

WHY THIS SIGNAL?

Buyer breadthStrong
Purchase sizeStrong
RoleModerate
RecencyModerate
ConvictionStrong
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+35.0 / 35
Purchase size+22.4 / 25
Role+13.0 / 20
Recency+6.7 / 10
Conviction+10.0 / 10

What is holding the score back?

  • ⚠ Role scores low · most senior buyer: President and CEO (CEO, chair and 10% owners score lowest)
  • ✓ Cluster breadth is broad · 4+ insiders

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Hartree Partners, LPTenPercentOwner
●●●●●●●●●●●●●●●●
Sheriff AlanDirector
●○
Prouty Eric ADirector
●○
Mansy Loan NguyenDirector
●○
Feeler Jeffrey RDirector
●○
Parrillo RichardDirector
●●
● Purchase▼ Sale○ Other

Showing the six most active owners; 3 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS9
PURCHASE CONCENTRATION97%Largest buyer: Hartree Partners, LP · $6.6M
CLUSTER BUYING · 15D8 insidersPeak activity: 2026-05-13–2026-05-19

Roles in the peak window: Chief Financial Officer, Director, President and CEO. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

87.0 / 100

Latest recorded score

↓ -0.3 ptsversus the previous recorded snapshot
  1. 87.7
  2. 87.6
  3. 87.5
  4. 87.3
  5. 87.0

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

28Purchases
2Sales
12Other Form 4 lines
29SEC filings · 365 days
BUYING27 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER4 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-3.7%
3M
-19.7%
6M
-15.4%
12M
-44.3%

Volatility & liquidity

Volatility
48.3%
Beta
0.77
Avg daily value
USD 2.9M

Valuation

Market cap
USD 221.4M
P/E
25.0×

Fundamentals

Profit margin
6.8%
ROE
6.8%
Industry
Specialty Chemicals

Market data

Price data up to: 2026-10-07 · Price source: OpenBB/yfinance · From SEC filings: Profit margin, ROE · Fiscal year ended: 2025-12-31 · From Yahoo Finance: Market cap, P/E · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
2,688,167
Previous report
2,837,071
Avg daily volume
452,181
Days to cover
5.9

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-24Hartree Partners, LPPurchase (P)Common Stock, par value $0.01118,549USD 5.10USD 604,600SEC filing ↗
2026-09-23Hartree Partners, LPPurchase (P)Common Stock, par value $0.0111,013USD 5.10USD 56,166SEC filing ↗
2026-09-21Hartree Partners, LPPurchase (P)Common Stock, par value $0.012,502USD 5.10USD 12,760SEC filing ↗
2026-09-16Hartree Partners, LPPurchase (P)Common Stock, par value $0.0111,136USD 5.10USD 56,794SEC filing ↗
2026-09-02Hartree Partners, LPPurchase (P)Common Stock, par value $0.015,317USD 5.10USD 27,117SEC filing ↗
2026-08-25Hartree Partners, LPPurchase (P)Common Stock, par value $0.0191,166USD 5.50USD 501,413SEC filing ↗
2026-08-24Hartree Partners, LPPurchase (P)Common Stock, par value $0.019,446USD 5.50USD 51,953SEC filing ↗
2026-08-12Hartree Partners, LPPurchase (P)Common Stock, par value $0.015,198USD 5.50USD 28,589SEC filing ↗
2026-07-29Hartree Partners, LPPurchase (P)Common Stock, par value $0.0152,104USD 5.99USD 312,103SEC filing ↗
2026-07-21Hartree Partners, LPPurchase (P)Common Stock, par value $0.0147,708USD 5.99USD 285,771SEC filing ↗
2026-07-20Hartree Partners, LPPurchase (P)Common Stock, par value $0.0117,842USD 5.99USD 106,874SEC filing ↗
2026-07-07Hartree Partners, LPPurchase (P)Common Stock, par value $0.01600USD 5.99USD 3,594SEC filing ↗
2026-07-06Hartree Partners, LPPurchase (P)Common Stock, par value $0.014,634USD 5.99USD 27,758SEC filing ↗
2026-07-02Hartree Partners, LPPurchase (P)Common Stock, par value $0.01271,302USD 5.97USD 1,619,673SEC filing ↗
2026-07-01Hartree Partners, LPPurchase (P)Common Stock, par value $0.01288,111USD 5.88USD 1,694,093SEC filing ↗

Form 4 evidence

42 transaction lines in the latest 365-day window; 237 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-24Hartree Partners, LPPurchase (P)Common Stock, par value $0.01118,549USD 5.10USD 604,600SEC filing ↗
2026-09-23Hartree Partners, LPPurchase (P)Common Stock, par value $0.0111,013USD 5.10USD 56,166SEC filing ↗
2026-09-21Hartree Partners, LPPurchase (P)Common Stock, par value $0.012,502USD 5.10USD 12,760SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-24Hartree Partners, LPPurchase (P)Common Stock, par value $0.01118,549USD 5.10USD 604,600SEC filing ↗
2026-09-23Hartree Partners, LPPurchase (P)Common Stock, par value $0.0111,013USD 5.10USD 56,166SEC filing ↗
2026-09-21Hartree Partners, LPPurchase (P)Common Stock, par value $0.012,502USD 5.10USD 12,760SEC filing ↗
2026-09-16Hartree Partners, LPPurchase (P)Common Stock, par value $0.0111,136USD 5.10USD 56,794SEC filing ↗
2026-09-02Hartree Partners, LPPurchase (P)Common Stock, par value $0.015,317USD 5.10USD 27,117SEC filing ↗
2026-08-25Hartree Partners, LPPurchase (P)Common Stock, par value $0.0191,166USD 5.50USD 501,413SEC filing ↗
2026-08-24Hartree Partners, LPPurchase (P)Common Stock, par value $0.019,446USD 5.50USD 51,953SEC filing ↗
2026-08-12Hartree Partners, LPPurchase (P)Common Stock, par value $0.015,198USD 5.50USD 28,589SEC filing ↗
2026-07-29Hartree Partners, LPPurchase (P)Common Stock, par value $0.0152,104USD 5.99USD 312,103SEC filing ↗
2026-07-21Hartree Partners, LPPurchase (P)Common Stock, par value $0.0147,708USD 5.99USD 285,771SEC filing ↗
2026-07-20Hartree Partners, LPPurchase (P)Common Stock, par value $0.0117,842USD 5.99USD 106,874SEC filing ↗
2026-07-07Hartree Partners, LPPurchase (P)Common Stock, par value $0.01600USD 5.99USD 3,594SEC filing ↗
2026-07-06Hartree Partners, LPPurchase (P)Common Stock, par value $0.014,634USD 5.99USD 27,758SEC filing ↗
2026-07-02Hartree Partners, LPPurchase (P)Common Stock, par value $0.01271,302USD 5.97USD 1,619,673SEC filing ↗
2026-07-01Hartree Partners, LPPurchase (P)Common Stock, par value $0.01288,111USD 5.88USD 1,694,093SEC filing ↗
2026-06-30Hartree Partners, LPPurchase (P)Common Stock, par value $0.01204,789USD 5.68USD 1,163,202SEC filing ↗
2026-06-17Sheriff AlanAward / grant (A)Common Stock3,219USD 0.00USD 0SEC filing ↗
2026-06-17Prouty Eric AAward / grant (A)Common Stock4,440USD 0.00USD 0SEC filing ↗
2026-06-17Mansy Loan NguyenAward / grant (A)Common Stock8,881USD 0.00USD 0SEC filing ↗
2026-06-17Feeler Jeffrey RAward / grant (A)Common Stock3,219USD 0.00USD 0SEC filing ↗
2026-05-19Bertaux Brian J.Purchase (P)Common Stock2,000USD 4.87USD 9,740SEC filing ↗
2026-05-14Parrillo RichardPurchase (P)Common Stock5,000USD 4.96USD 24,814SEC filing ↗
2026-05-14Mansy Loan NguyenPurchase (P)Common Stock5,000USD 4.96USD 24,814SEC filing ↗
2026-05-14Feeler Jeffrey RPurchase (P)Common Stock5,100USD 4.92USD 25,092SEC filing ↗
2026-05-14Bulgarino Nicole EPurchase (P)Common Stock550USD 4.85USD 2,668SEC filing ↗
2026-05-13Parrillo RichardPurchase (P)Common Stock10,000USD 4.83USD 48,300SEC filing ↗
2026-05-13Sheriff AlanPurchase (P)Common Stock5,200USD 4.88USD 25,376SEC filing ↗
2026-05-13Prouty Eric APurchase (P)Common Stock5,000USD 4.84USD 24,200SEC filing ↗
2026-05-13Gaglione KennethPurchase (P)Common Stock5,000USD 4.90USD 24,500SEC filing ↗
2026-04-10Sheriff AlanAward / grant (A)Common Stock4,065USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerHDSN
CIK0000925528
SectorBasic Materials
IndustrySpecialty Chemicals Yahoo Finance
SEC SIC5080 Wholesale-Machinery, Equipment & Supplies
ExchangeNasdaq

Data coverage

Local Form 4 history237 transaction lines from 2020-07-20 to 2026-09-24
33 P purchase lines · 62 S sale lines · 142 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.