Nephros Ownership | Who Owns Nephros?

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Nephros Ownership Summary

Nephros is owned by 42.78% institutional investors, 11.31% insiders, and 45.91% retail investors. Wexford capital lp is the largest institutional shareholder, holding 34.12% of NEPH shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 1.23% of its assets in Nephros shares.

NEPH Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Nephros	42.78%	11.31%	45.91%
Sector	Healthcare Stocks	232.01%	10.74%	-142.75%
Industry	Medical Instruments & Supplies Stocks	32.32%	13.56%	54.11%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Wexford capital lp	3.62M	34.12%	$17.11M
Topline capital management	596.30K	5.63%	$2.82M
Vanguard group	233.64K	2.20%	$1.14M
Bard associates	127.12K	1.20%	$601.28K
Renaissance	103.77K	0.98%	$506.41K
Geode capital management	74.63K	0.70%	$364.28K
Cambridge investment research advisors	69.15K	0.65%	$337.00K
Hightower advisors	59.71K	0.56%	$291.38K
Mesirow financial investment management	50.00K	0.47%	$244.00K
Blair william & co/il	36.25K	0.34%	$171.46K

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Wexford capital lp	3.62M	2.46%	$17.11M
Topline capital management	596.30K	0.48%	$2.82M
Bard associates	127.12K	0.16%	$601.28K
Elkhorn partners limited partnership	12.50K	0.04%	$59.13K
Essex investment management	24.82K	0.02%	$117.41K
Navellier & associates	27.18K	0.01%	$132.61K
Mesirow financial investment management	50.00K	0.01%	$244.00K
Xtx topco	14.55K	0.00%	$68.84K
Cambridge investment research advisors	69.15K	0.00%	$337.00K
Renaissance	103.77K	0.00%	$506.41K

Top Buyers

Holder	Shares	% Assets	Change
Topline capital management	596.30K	0.48%	118.85K
Cambridge investment research advisors	69.15K	0.00%	69.15K
Mesirow financial investment management	50.00K	0.01%	36.20K
Navellier & associates	27.18K	0.01%	27.18K
Susquehanna group, llp	23.80K	-	23.80K

Top Sellers

Holder	Shares	% Assets	Change
Vanguard group	233.64K	-	-47.66K
Granite investment partners	-	-	-13.97K
Two sigma securities	-	-	-11.62K
Bard associates	127.12K	0.16%	-4.00K
Elkhorn partners limited partnership	12.50K	0.04%	-2.00K

New Positions

Holder	Shares	% Assets	Change	Value
Cambridge investment research advisors	69.15K	0.00%	69.15K	$337.00K
Navellier & associates	27.18K	0.01%	27.18K	$132.61K
Susquehanna group, llp	23.80K	-	23.80K	$34.75K
Xtx topco	14.55K	0.00%	14.55K	$68.84K
Citadel advisors	11.85K	-	11.85K	$25.00K

Sold Out

Holder	Change
Jpmorgan chase	-13.00
Newedge advisors	-36.00
Ubs group	-66.00
Wells fargo & company/mn	-73.00
Barclays	-106.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	21	-8.70%	4,540,044	-9.47%	42	1.91%	15	87.50%	3	-62.50%
Sep 30, 2025	23	15.00%	5,015,032	3.35%	47	2.26%	8	-27.27%	8	60.00%
Jun 30, 2025	19	11.76%	4,852,137	4.02%	45	2.36%	10	66.67%	5	-
Mar 31, 2025	17	-	4,665,065	-0.99%	44	2.20%	6	50.00%	5	-28.57%
Dec 31, 2024	17	-	4,711,852	9.97%	44	2.71%	4	-20.00%	7	16.67%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	130.90K	1.23%	1.90K
Vanguard US Total Market Shares ETF	129.66K	1.22%	-
Vanguard Institutional Extnd Mkt Idx Tr	67.74K	0.64%	-
Navellier Small-Mid Cap Growth	35.02K	0.33%	-
Fidelity Extended Market Index	33.91K	0.32%	2.39K
Fidelity Total Market Index	11.57K	0.11%	-
Spartan Extended Market Index Pool F	10.87K	0.10%	61.00
NT Ext Equity Mkt Idx Fd - L	10.61K	0.10%	3.54K
Fidelity Series Total Market Index	9.53K	0.09%	-
Northern Trust Extended Eq Market Idx	7.07K	0.07%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
May 28, 2024	Amron Arthur H	-	Buy	$4.44K
May 30, 2024	Amron Arthur H	-	Buy	$6.73K
May 16, 2024	Banks Robert R. Jr.	President and CEO	Buy	$112.05K
Mar 12, 2024	Amron Arthur H	-	Buy	$17.13K
Dec 07, 2023	Banks Robert R. Jr.	President and CEO	Buy	$39.65K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	-
2025 Q2	-	-
2025 Q1	-	-
2024 Q2	3	-
2024 Q1	1	-

NEPH Ownership FAQ

Who Owns Nephros?

Nephros shareholders are primarily institutional investors at 42.78%, followed by 11.31% insiders and 45.91% retail investors. The average institutional ownership in Nephros's industry, Medical Instruments & Supplies Stocks, is 32.32%, which Nephros exceeds.

Who owns the most shares of Nephros?

Nephros’s largest shareholders are Wexford capital lp (3.62M shares, 34.12%), Topline capital management (596.3K shares, 5.63%), and Vanguard group (233.64K shares, 2.20%). Together, they hold 41.95% of Nephros’s total shares outstanding.

Does Blackrock own Nephros?

BlackRock is not among the top 10 institutional shareholders of Nephros.

Who is Nephros’s biggest shareholder by percentage of total assets invested?

Wexford capital lp is Nephros’s biggest shareholder by percentage of total assets invested, with 2.46% of its assets in 3.62M Nephros shares, valued at 17.11M$.

Who is the top mutual fund holder of Nephros shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Nephros shares, with 1.23% of its total shares outstanding invested in 130.9K Nephros shares.

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