NEPH
Nephros IncCompany with tickers: NEPH
CIK
1196298
CUSIP
640671400
Shares Outstanding
10,856,546
Website
https://www.nephros.com
Investor Relations
https://www.nephros.com/investors/
13F Activity (30d)
14 filings
14 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 21
Total Value: $15,208,187
Total Shares: 5,103,421
Institutional Ownership Trend
26 quarters
Holder Concentration
Across 21 13F filers · Δ vs Dec 31, 2025Top Holder
70.6%
−14.5 pts
Top 5
90.7%
−1.9 pts
Top 10
97.2%
+0.4 pts
HHI
5,146
Highly concentrated−2,106
Quarterly Activity
vs Dec 31, 2025
New
5
Increased
2
Decreased
6
Sold Out
9
Unchanged
8
Holder count:
-4
Institutional value:
-26.7%
Shares held:
+20.0%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mid Mesirow Financial Investment Management, Inc. | +70,000 | 120,000 | |
| Micro ELKHORN PARTNERS LIMITED PARTNERSHIP | +5,000 | 12,000 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Small WEXFORD CAPITAL LP | −16,481 | 3,600,552 | |
| Small NAVELLIER & ASSOCIATES INC | −8,049 | 19,126 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | −1,703 | 72,925 | |
| Mid PRELUDE CAPITAL MANAGEMENT, LLC | −1,500 | 13,680 | |
| Large OSAIC HOLDINGS, INC. | −1,450 | 175 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Small Topline Capital Management, LLC | 581,967 | $1,734,261 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 198,643 | $591,956 | |
| Small Cornerstone Capital, Inc. | 128,700 | $383,526 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 36,901 | $109,964 | |
| Small De Lisle Partners LLP | 25,000 | $74,500 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Large Cambridge Investment Research Advisors, Inc. | 69,149 | $337,447 | |
| Mid Quadrature Capital Ltd | 23,004 | $112,259 | |
| Large MARSHALL WACE, LLP | 21,983 | $107,277 | |
| Mid XTX Topco Ltd | 21,617 | $105,490 | |
| Mid Heron Bay Capital Management | 13,471 | $65,738 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Small WEXFORD CAPITAL LP | $10,729,644 | 70.55% | 3,600,552 | Shares | Sole | 2026-05-15 | ||||
| Small Topline Capital Management, LLC | $1,734,261 | 11.40% | 581,967 | Shares | Sole | 2026-05-15 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $591,956 | 3.89% | 198,643 | Shares | Defined | 2026-05-15 | ||||
| Small Cornerstone Capital, Inc. | $383,526 | 2.52% | 128,700 | Shares | Sole | 2026-05-12 | ||||
| Small BARD ASSOCIATES INC | $361,181 | 2.37% | 121,202 | Shares | Sole | 2026-05-08 | ||||
| Mid Mesirow Financial Investment Management, Inc. | $357,600 | 2.35% | 120,000 | Shares | Sole | 2026-04-21 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $217,316 | 1.43% | 72,925 | Shares | Defined | 2026-05-15 | ||||
| Large HighTower Advisors, LLC | $177,935 | 1.17% | 59,710 | Shares | Sole | 2026-05-05 | ||||
| Small ESSEX INVESTMENT MANAGEMENT CO LLC | $116,172 | 0.76% | 38,984 | Shares | Sole | 2026-05-11 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $109,964 | 0.72% | 36,901 | Shares | Defined | 2026-05-08 | ||||
| Large BLAIR WILLIAM & CO/IL | $108,022 | 0.71% | 36,249 | Shares | Sole | 2026-05-08 | ||||
| Small De Lisle Partners LLP | $74,500 | 0.49% | 25,000 | Shares | Sole | 2026-05-13 | ||||
| Small NAVELLIER & ASSOCIATES INC | $56,995 | 0.37% | 19,126 | Shares | Sole | 2026-05-07 | ||||
| Mega STATE STREET CORP | $46,780 | 0.31% | 15,698 | Shares | Defined | 2026-05-15 | ||||
| Mid PRELUDE CAPITAL MANAGEMENT, LLC | $40,766 | 0.27% | 13,680 | Shares | Other | 2026-05-15 | ||||
| Micro ELKHORN PARTNERS LIMITED PARTNERSHIP | $35,760 | 0.24% | 12,000 | Shares | Sole | 2026-05-14 | ||||
| Mid Cannell & Spears LLC | $32,780 | 0.22% | 11,000 | Shares | Sole | 2026-05-15 | ||||
| Mega NORTHERN TRUST CORP Bank | $32,267 | 0.21% | 10,828 | Shares | Defined | 2026-05-14 | ||||
| Large OSAIC HOLDINGS, INC. | $521 | 0.00% | 175 | Shares | Defined | 2026-05-15 | ||||
| Mid HARBOUR INVESTMENTS, INC. | $149 | 0.00% | 50 | Shares | Sole | 2026-05-15 | ||||
| Large JONES FINANCIAL COMPANIES LLLP | $92 | 0.00% | 31 | Shares | Sole | 2026-05-15 | ||||
| No holders match your search. | ||||||||||