ProPhase Labs
PRPH
PRPH was delisted on the 2nd of January, 2026.
12 hedge funds and large institutions have $866K invested in ProPhase Labs in 2017 Q4 according to their latest regulatory filings, with 1 funds opening new positions, 5 increasing their positions, 4 reducing their positions, and 5 closing their positions.
25% more repeat investments, than reductions
Existing positions increased: 5 | Existing positions reduced: 4
0.36% less ownership
Funds ownership: 0.68% → 0.32% (-0.36%)
25% less funds holding
Funds holding: 16 → 12 (-4)
63% less capital invested
Capital invested by funds: $2.35M → $866K (-$1.49M)
80% less first-time investments, than exits
New positions opened: 1 | Existing positions closed: 5
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
+$25.8K |
| 2 |
Renaissance Technologies
New York
|
+$21.3K |
| 3 |
Deutsche Bank
Frankfurt Am Main Ge,
Germany
|
+$9.16K |
| 4 |
Acadian Asset Management
Boston,
Massachusetts
|
+$7.76K |
| 5 |
BlackRock
New York
|
+$3.54K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
VIP
Vantage Investment Partners
Kansas City,
Missouri
|
-$927K |
| 2 |
Dimensional Fund Advisors
Austin,
Texas
|
-$313K |
| 3 |
Bank of New York Mellon
New York
|
-$146K |
| 4 |
California Public Employees Retirement System
Sacramento,
California
|
-$101K |
| 5 |
Vanguard Group
Malvern,
Pennsylvania
|
-$70K |
PRPH Hedge Fund Activity: Q4 2017 in Review
12 of the 4,418 institutional investors tracked by Wall St. Rank reported a position in ProPhase Labs (PRPH) for Q4 2017, worth a combined $866K — down 63% from $2.35M a quarter earlier.
Sellers outnumbered buyers: 5 funds closed out of PRPH and 1 opened new positions — a net loss of 4 holders — while 4 trimmed existing stakes and 5 added.
The largest buyer was Citadel Advisors, opening a new position worth an estimated $25.8K. The largest seller was Vantage Investment Partners, exiting entirely with an estimated $927K sold.
- 12 institutional investors held ProPhase Labs (PRPH) as of Q4 2017, down from 16 in Q3 2017.
- Funds reported $866K of ProPhase Labs stock for Q4 2017, down 63% quarter-over-quarter.
- 1 fund opened new ProPhase Labs positions in Q4 2017 and 5 closed out, a net change of -4 holders.
- The largest ProPhase Labs buyer in Q4 2017 was Citadel Advisors, an estimated $25.8K added.
- The largest ProPhase Labs seller in Q4 2017 was Vantage Investment Partners, an estimated $927K sold.
Based on aggregated 13F filings for Q4 2017.