HDSN · Hudson Technologies Inc · Shareholders & Ownership

$5.20 -0.07 (-1.24%) Q1 2026 earnings call transcript

Russell 2000 member Rebalance outlook locked

Market Cap

$221.39M

42.09M

Volume · Oct 28 192.51K Avg daily vol (3M) 507.59K

Every disclosed holder of HDSN in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns HDSN

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	149	31,525,472	74.90%	Yes
Insiders (Forms 3, 4, 5)	12	1,294,315	3.08%	Yes
13D/G-only blocks	2	2,371,063	5.63%	Yes
Remaining	—	6,897,697	16.39%	Rest
Registered funds (N-PORT, not summed)	154	9,491,725	22.55%	No

Shares outstanding: 42,088,547, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of HDSN

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	Hartree Partners, LP Insider CIK 1597857 · Sep 24, 2026 10% Owner, issuer-wide, not summed	5,348,517	12.71%	+118,549	Sep 24, 2026	10% Owner, issuer-wide, not summed
1.1	Hartree Partners, LP 13G CIK 1597857 · Unknown · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	4,971,302	11.81%	+1,171,302	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
1.2	Hartree Partners, LP 13F CIK 1597857 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	4,411,889	10.48%	+611,889	Jun 30, 2026	carried, not yet filed for the newest quarter
2	WESTERLY CAPITAL MANAGEMENT, LLC 13F CIK 1546172 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,380,000	8.03%	+205,000	Jun 30, 2026	carried, not yet filed for the newest quarter
3	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	2,840,272	6.75%	-22,267	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	966,157	2.30%	+8,710	Jun 30, 2026	iShares Trust, not summed
3.2	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	355,256	0.84%	+29,650	Jun 30, 2026	iShares Trust, not summed
3.3	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	125,806	0.30%	+28,968	Jun 30, 2026	iShares Trust, not summed
3.4	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	66,535	0.16%	0	Jun 30, 2026	Quantitative Master Series LLC, not summed
3.5	iShares Core S&P Total U.S. Stock Market ETF Fund S000004317 · Registered fund · Jun 30, 2026 iShares Trust, not summed	61,754	0.15%	+1,360	Jun 30, 2026	iShares Trust, not summed
4	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,967,914	4.68%	-180,397	Jun 30, 2026	carried, not yet filed for the newest quarter
4.1	DIMENSIONAL FUND ADVISORS LP 13G CIK 354204 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,967,914	4.68%	-180,397	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
4.2	U.S. SMALL CAP VALUE PORTFOLIO Fund S000000987 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	573,473	1.36%	+64,429	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
4.3	Dimensional US Small Cap Value ETF Fund S000075151 · Registered fund · Jul 31, 2026 Dimensional ETF Trust, not summed	245,982	0.58%	+94,556	Jul 31, 2026	Dimensional ETF Trust, not summed
4.4	U.S. SMALL CAP PORTFOLIO Fund S000000971 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	194,008	0.46%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
4.5	U.S. Targeted Value Portfolio Fund S000000970 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	181,589	0.43%	-88,164	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
5	Riva Ridge Capital Management LP 13G CIK 1676700 · Unknown · Dec 31, 2023 Rule 13d-1(c), passive investor	1,704,928	4.05%	—	Dec 31, 2023	Rule 13d-1(c), passive investor
6	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,654,259	3.93%	-5,887	Jun 30, 2026	carried, not yet filed for the newest quarter
7	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,442,115	3.43%	-62,135	Jun 30, 2026	carried, not yet filed for the newest quarter
8	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,189,633	2.83%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
9	AMERICAN CENTURY COMPANIES INC 13F CIK 748054 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,169,462	2.78%	-318,312	Jun 30, 2026	carried, not yet filed for the newest quarter
10	Avantis U.S. Small Cap Value ETF Fund S000066459 · Registered fund · May 31, 2026 American Century ETF Trust, not summed	1,124,116	2.67%	-167,741	May 31, 2026	American Century ETF Trust, not summed
11	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	995,011	2.36%	+46,465	Jun 30, 2026	carried, not yet filed for the newest quarter
12	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	895,776	2.13%	-2,097	Jun 30, 2026	carried, not yet filed for the newest quarter
12.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	15,595	0.04%	+3,300	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
12.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	914	0.00%	0	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
12.3	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	521	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
13	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 13F CIK 1164508 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	777,989	1.85%	-103,246	Jun 30, 2026	carried, not yet filed for the newest quarter
14	CASPIAN CAPITAL LP 13F CIK 1518999 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	728,306	1.73%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	721,847	1.72%	+350,971	Jun 30, 2026	carried, not yet filed for the newest quarter
16	COOPER CREEK PARTNERS MANAGEMENT LLC 13G CIK 1512162 · Investment adviser · Dec 31, 2023 Rule 13d-1(b), qualified institution	666,135	1.58%	—	Dec 31, 2023	Rule 13d-1(b), qualified institution
17	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	574,266	1.36%	+161,516	Jun 30, 2026	carried, not yet filed for the newest quarter
18	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	506,591	1.20%	+327,658	Jun 30, 2026	carried, not yet filed for the newest quarter
19	BRIDGEWAY CAPITAL MANAGEMENT, LLC 13F CIK 1107261 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	494,432	1.17%	-3,677	Jun 30, 2026	carried, not yet filed for the newest quarter
19.1	Ultra-Small Company Fund Fund S000004423 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	186,842	0.44%	0	Jun 30, 2026	Bridgeway Funds, Inc., not summed
19.2	Omni Small-Cap Value Fund Fund S000033567 · Registered fund · Jun 30, 2026 Bridgeway Funds, Inc., not summed	101,712	0.24%	-15,000	Jun 30, 2026	Bridgeway Funds, Inc., not summed
20	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	476,540	1.13%	+392,825	Jun 30, 2026	carried, not yet filed for the newest quarter
20.1	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	46,787	0.11%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
20.2	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	41,890	0.10%	—	Jun 30, 2026	College Retirement Equities Fund, not summed
20.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	34,020	0.08%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
20.4	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	1,076	0.00%	0	Jun 30, 2026	TIAA Separate Account VA-1, not summed
20.5	Nuveen Life Stock Index Fund Fund S000005094 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	699	0.00%	0	Jun 30, 2026	TIAA-CREF Life Funds, not summed
21	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	474,354	1.13%	+255,083	Jun 30, 2026	carried, not yet filed for the newest quarter
22	COLEMAN BRIAN F Insider CIK 1250706 · Dec 5, 2025 Director, issuer-wide	426,968	1.01%	-484,616	Dec 5, 2025	Director, issuer-wide
23	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	423,209	1.01%	-1,530	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
24	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	409,591	0.97%	+50,909	Jun 30, 2026	carried, not yet filed for the newest quarter
25	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	367,159	0.87%	-104,788	Jun 30, 2026	carried, not yet filed for the newest quarter
26	Russell Investments Group, Ltd. 13F CIK 1692234 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	362,489	0.86%	+208,096	Jun 30, 2026	carried, not yet filed for the newest quarter
26.1	U.S. Small Cap Equity Fund Fund S000001586 · Registered fund · Jul 31, 2026 RUSSELL INVESTMENT CO, not summed	99,277	0.24%	+58,307	Jul 31, 2026	RUSSELL INVESTMENT CO, not summed
26.2	Russell Investments U.S. Small Cap Equity ETF Fund S000089990 · Registered fund · Jun 30, 2026 Russell Investments Exchange Traded Funds, not summed	19,103	0.05%	+7,153	Jun 30, 2026	Russell Investments Exchange Traded Funds, not summed
26.3	U.S. Small Cap Equity Fund Fund S000006864 · Registered fund · Jun 30, 2026 RUSSELL INVESTMENT FUNDS, not summed	12,882	0.03%	+1,516	Jun 30, 2026	RUSSELL INVESTMENT FUNDS, not summed
27	683 Capital Management, LLC 13F CIK 1404574 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	325,000	0.77%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
28	JB CAPITAL PARTNERS LP 13F CIK 1138532 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	306,200	0.73%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Ancora Advisors LLC 13F CIK 1446114 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	303,380	0.72%	+303,380	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Kerrisdale Advisers, LLC 13F CIK 1569688 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	299,976	0.71%	+242,354	Jun 30, 2026	carried, not yet filed for the newest quarter
31	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	290,537	0.69%	+22,001	Jun 30, 2026	carried, not yet filed for the newest quarter
32	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	282,011	0.67%	-117,352	Jun 30, 2026	carried, not yet filed for the newest quarter
32.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	16,665	0.04%	+862	Jun 30, 2026	Northern Funds, not summed
33	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	245,071	0.58%	+2,205	Jun 30, 2026	carried, not yet filed for the newest quarter
34	KBC Group NV 13F CIK 1411133 · Unknown · Sep 30, 2026	207,466	0.49%	0	Sep 30, 2026
35	Empowered Funds, LLC 13F CIK 1592828 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	205,878	0.49%	+11,323	Jun 30, 2026	carried, not yet filed for the newest quarter
35.1	EA Bridgeway Omni Small-Cap Value ETF Fund S000078089 · Registered fund · Jun 30, 2026 EA Series Trust, not summed	205,878	0.49%	+11,323	Jun 30, 2026	EA Series Trust, not summed
36	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	204,779	0.49%	-77,656	Jun 30, 2026	carried, not yet filed for the newest quarter
37	KESTREL INVESTMENT MANAGEMENT CORP 13F CIK 917579 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	200,750	0.48%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
38	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	197,892	0.47%	+7,465	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
39	Parrillo Richard Insider CIK 1620726 · May 13, 2026 Director, issuer-wide	195,746	0.47%	+10,000	May 13, 2026	Director, issuer-wide
40	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	176,708	0.42%	-21,224	Jun 30, 2026	carried, not yet filed for the newest quarter
40.1	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Aug 31, 2026 GOLDMAN SACHS TRUST, not summed	36,792	0.09%	+8,560	Aug 31, 2026	GOLDMAN SACHS TRUST, not summed
40.2	Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF Fund S000048296 · Registered fund · Aug 31, 2026 Goldman Sachs ETF Trust, not summed	29,487	0.07%	-16,809	Aug 31, 2026	Goldman Sachs ETF Trust, not summed
41	Pacific Ridge Capital Partners, LLC 13F CIK 1591546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	174,539	0.41%	+27,609	Jun 30, 2026	carried, not yet filed for the newest quarter
42	ABBATECOLA VINCENT P Insider CIK 1250688 · Nov 17, 2025 Director, issuer-wide	169,748	0.40%	+3,500	Nov 17, 2025	Director, issuer-wide
43	MARATHON CAPITAL MANAGEMENT 13F CIK 1213206 · Registered investment adviser · Sep 30, 2026	168,325	0.40%	-5,000	Sep 30, 2026
44	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	161,903	0.38%	-182,401	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Houghton Kathleen Insider CIK 1824104 · Jan 8, 2026 Director, Sr. VP-Sales and Marketing, issuer-wide	158,618	0.38%	+110,770	Jan 8, 2026	Director, Sr. VP-Sales and Marketing, issuer-wide
46	Prouty Eric A Insider CIK 1620724 · Jun 17, 2026 Director, issuer-wide	158,292	0.38%	+4,440	Jun 17, 2026	Director, issuer-wide
47	FIRST TRUST ADVISORS LP 13F CIK 1125816 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	151,809	0.36%	+6,726	Jun 30, 2026	carried, not yet filed for the newest quarter
47.1	First Trust Dow Jones Select MicroCap Index Fund Fund S000010772 · Registered fund · Jun 30, 2026 First Trust Exchange-Traded Fund, not summed	122,866	0.29%	+2,534	Jun 30, 2026	First Trust Exchange-Traded Fund, not summed
47.2	First Trust Active Factor Small Cap ETF Fund S000066790 · Registered fund · Aug 31, 2026 First Trust Exchange-Traded Fund VIII, not summed	33,061	0.08%	+6,264	Aug 31, 2026	First Trust Exchange-Traded Fund VIII, not summed
48	Numerai GP LLC 13F CIK 1668527 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	150,254	0.36%	-27,038	Jun 30, 2026	carried, not yet filed for the newest quarter
49	SummerHaven Investment Management, LLC 13F CIK 1846436 · Unknown · Sep 30, 2026	141,785	0.34%	+141,785	Sep 30, 2026
50	CREDIT AGRICOLE S A 13F CIK 1191672 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	140,000	0.33%	0	Jun 30, 2026	carried, not yet filed for the newest quarter

15 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 249 holders

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Key facts CIK 925528 CUSIP 444144109 13F (30d) 24 filings 24 filers Visit website Investor relations