New Positions
1 managers initiated
Top five by reported value
- UBS Group AG$7.0K
MEDIROM Healthcare Technologies Inc. NCM:MRM
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
1 new2 added0 reduced2 exited
Total Institutional Holders
3
as of 2025-12-31
Top Holder
GAMMA Investing LLC
$20.5K
Largest QoQ Increase
GAMMA Investing LLC
+5,941 sh
Largest QoQ Decrease
JANE STREET GROUP, LLC
-155,071 sh
New Positions(1)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| UBS Group AG | 3,616 | +3,616 | $7.0K | +$7.0K | — |
Added To(2)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| GAMMA Investing LLC | 10,555 | +5,941 | $20.5K | +$10.7K | 128.8% |
| RHUMBLINE ADVISERS | 4,253 | +2,946 | $8.3K | +$5.5K | 225.4% |
Sold Out(2)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| JANE STREET GROUP, LLC | 0 | -155,071 | $0 | -$328.8K | — |
| Tower Research Capital LLC (TRC) | 0 | -3,377 | $0 | -$7.2K | — |
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
| Manager | Shares | $ Value | Δ Shares | QoQ % |
|---|---|---|---|---|
| GAMMA Investing LLC | 10,555 | $20.5K | +5,941 | 128.8% |
| RHUMBLINE ADVISERS | 4,253 | $8.3K | +2,946 | 225.4% |
| UBS Group AG | 3,616 | $7.0K | +3,616 | — |
New & Closed Positions this quarter
Closed Positions
2 managers exited
Top five by prior-quarter value
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for MRM against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.