Nephros Inc (NEPH) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

8,040,000Shares Outstanding

0Shares held by institutions

$0Value of institutional holdings

3.21%Institutional ownership %

0.00%Shares Changed QoQ

9No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Nephros Inc (NASDAQ:NEPH) currently has 34 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

The collective stake of institutional investors in Nephros moved to 50.1% in December 2025, a shift up from the 47.3% reported for September 2025.
The company experienced a 6.26% quarterly change in institutional shares held, alongside an increase of 78.95% in total owners annually.
A review of institutional activity for Nephros shows 24 of 34 filers increasing their positions, while 5 reduced their stake, and 5 remained unchanged.
The aggregate institutional position in Nephros now stands at 5.30Mn shares as of December 2025, after investors increased their holdings (up by 312.32K shares quarter on quarter which is up 590.40K shares year over year).
WEXFORD CAPITAL LP's holding of 3.62Mn shares as of December 31, 2025 makes it the primary institutional investor in Nephros, owning 34.19% of the stock.
Among the most significant buyers of Nephros during December 2025 were Cambridge Investment Research Advisors, Inc. (69.15K), Mesirow Financial Investment Management, Inc. (36.20K), NAVELLIER & ASSOCIATES INC (27.18K), De Lisle Partners LLP (25.00K), Quadrature Capital Ltd (23.00K).
Leading sellers of Nephros stock in December 2025 included VANGUARD GROUP INC (47.66K), BARD ASSOCIATES INC (5.50K), ELKHORN PARTNERS LIMITED PARTNERSHIP (5.50K), GEODE CAPITAL MANAGEMENT, LLC (1.26K), BANK OF AMERICA CORP /DE/ (19).
The top 10 institutional holders of Nephros for the quarter ending December 2025 included WEXFORD CAPITAL LP (3.62Mn), Topline Capital Management, LLC (614.30K), VANGUARD GROUP INC (233.64K), BARD ASSOCIATES INC (121.62K), RENAISSANCE TECHNOLOGIES LLC (103.77K), GEODE CAPITAL MANAGEMENT, LLC (74.63K), Cambridge Investment Research Advisors, Inc. (69.15K), HighTower Advisors, LLC (59.71K), Mesirow Financial Investment Management, Inc. (50.00K), ESSEX INVESTMENT MANAGEMENT CO LLC (38.98K).

34 Institutional Holders

0 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
WEXFORD CAPITAL LP	31 Dec, 2025	3,617,033	0	0.00%	$17,651,117.00
Topline Capital Management, LLC	31 Dec, 2025	614,302	18,002	3.02%	$2,997,794.00
VANGUARD GROUP INC	31 Dec, 2025	233,644	-47,662	-16.94%	$1,140,183.00
BARD ASSOCIATES INC	31 Dec, 2025	121,619	-5,502	-4.33%	$593,501.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	103,772	21,272	25.78%	$506,407.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	74,628	-1,263	-1.66%	$364,278.00
Cambridge Investment Research Advisors, Inc.	31 Dec, 2025	69,149	69,149	0.00%	$337.00
HighTower Advisors, LLC	31 Dec, 2025	59,710	4,000	7.18%	$291,385.00
Mesirow Financial Investment Management, Inc.	31 Dec, 2025	50,000	36,200	262.32%	$244,000.00
ESSEX INVESTMENT MANAGEMENT CO LLC	31 Dec, 2025	38,984	14,162	57.05%	$190,242.00
BLAIR WILLIAM & CO/IL	31 Dec, 2025	36,249	0	0.00%	$176,895.00
NAVELLIER & ASSOCIATES INC	31 Dec, 2025	27,175	27,175	0.00%	$132,614.00
De Lisle Partners LLP	31 Dec, 2025	25,000	25,000	0.00%	$122,000.00
Quadrature Capital Ltd	31 Dec, 2025	23,004	23,004	0.00%	$112,260.00
MARSHALL WACE, LLP	31 Dec, 2025	21,983	21,983	0.00%	$107,277.00
XTX Topco Ltd	31 Dec, 2025	21,617	21,617	0.00%	$105,491.00
CITADEL ADVISORS LLC	31 Dec, 2025	20,710	4,165	25.17%	$101,065.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	18,980	337	1.81%	$92,622.00
MORGAN STANLEY	31 Dec, 2025	17,959	16,044	837.81%	$87,640.00
STATE STREET CORP	31 Dec, 2025	15,698	0	0.00%	$76,606.00

1 - 20 of 34

Research Tools