MEDIROM Healthcare Technologies
MRM
4 hedge funds and large institutions have $348K invested in MEDIROM Healthcare Technologies in 2025 Q3 according to their latest regulatory filings, with 1 funds opening new positions, 3 increasing their positions, 0 reducing their positions, and 3 closing their positions.
239% more capital invested
Capital invested by funds: $103K → $348K (+$246K)
1.16% more ownership
Funds ownership: 0.92% → 2.08% (+1.2%)
33% less funds holding
Funds holding: 6 → 4 (-2)
67% less first-time investments, than exits
New positions opened: 1 | Existing positions closed: 3
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Jane Street
New York
|
+$260K |
| 2 |
GI
GAMMA Investing
Foster City,
California
|
+$7.57K |
| 3 |
TRCT
Tower Research Capital (TRC)
New York
|
+$5.65K |
| 4 |
RhumbLine Advisers
Boston,
Massachusetts
|
+$347 |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
UBS Group
Zurich,
Switzerland
|
-$47.3K |
| 2 |
Mariner
Overland Park,
Kansas
|
-$27K |
| 3 |
Citadel Advisors
Miami,
Florida
|
-$26.9K |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
|
1
Jane Street
New York
| $329K | +$260K | +155,071 | New |
|
|
GI
2
GAMMA Investing
Foster City,
California
| $9.78K | +$7.57K | +4,510 | +4,337% |
|
|
TRCT
3
Tower Research Capital (TRC)
New York
| $7.16K | +$5.65K | +3,366 | +30,600% |
|
|
4
RhumbLine Advisers
Boston,
Massachusetts
| $2.77K | +$347 | +207 | +19% |
|
|
5
UBS Group
Zurich,
Switzerland
| – | -$47.3K | -33,280 | Closed |
|
|
6
Citadel Advisors
Miami,
Florida
| – | -$26.9K | -19,217 | Closed |
|
|
7
Mariner
Overland Park,
Kansas
| – | -$27K | -19,000 | Closed |
|
MRM Hedge Fund Activity: Q3 2025 in Review
4 of the 7,620 institutional investors tracked by Wall St. Rank reported a position in MEDIROM Healthcare Technologies (MRM) for Q3 2025, worth a combined $348K — up 239% from $103K a quarter earlier.
Sellers outnumbered buyers: 3 funds closed out of MRM and 1 opened new positions — a net loss of 2 holders — while 0 trimmed existing stakes and 3 added.
The largest buyer was Jane Street, opening a new position worth an estimated $260K. The largest seller was UBS Group, exiting entirely with an estimated $47.3K sold.
- 4 institutional investors held MEDIROM Healthcare Technologies (MRM) as of Q3 2025, down from 6 in Q2 2025.
- Funds reported $348K of MEDIROM Healthcare Technologies stock for Q3 2025, up 239% quarter-over-quarter.
- 1 fund opened new MEDIROM Healthcare Technologies positions in Q3 2025 and 3 closed out, a net change of -2 holders.
- The largest MEDIROM Healthcare Technologies buyer in Q3 2025 was Jane Street, an estimated $260K added.
- The largest MEDIROM Healthcare Technologies seller in Q3 2025 was UBS Group, an estimated $47.3K sold.
Based on aggregated 13F filings for Q3 2025.