MRM
Medirom Healthcare Technologies Inc.Company with tickers: MRM
CIK
1819704
CUSIP
58510H103
Shares Outstanding
7,901,950
13F Activity (30d)
3 filings
3 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: 5
Total Value: $68,120
Total Shares: 60,823
Institutional Ownership Trend
Holder Concentration
Across 5 13F filers · Δ vs Dec 31, 2025Top Holder
43.6%
−13.6 pts
Top 5
100.0%
0.0 pts
Top 10
100.0%
0.0 pts
HHI
2,938
Highly concentrated
−1,262
Quarterly Activity
vs Dec 31, 2025
New
2
Increased
1
Decreased
2
Sold Out
0
Unchanged
0
Holder count:
+2
Institutional value:
+90.6%
Shares held:
+230.1%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega UBS Group AG | +22,932 | 26,548 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mid GAMMA Investing LLC | −4,146 | 6,409 | |
| Mega RHUMBLINE ADVISERS | −2,269 | 1,984 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Small TWO SIGMA SECURITIES, LLC | 13,977 | $15,654 | |
| Large HRT FINANCIAL LP | 11,905 | $13,333 |
Top Sold-Out Positions
vs Dec 31, 2025No fully closed positions this quarter.
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega UBS Group AG | $29,733 | 43.65% | 26,548 | Shares | Defined | 2026-05-05 | ||||
| Small TWO SIGMA SECURITIES, LLC Broker-Dealer | $15,654 | 22.98% | 13,977 | Shares | Sole | 2026-05-15 | ||||
| Large HRT FINANCIAL LP | $13,333 | 19.57% | 11,905 | Shares | Defined | 2026-05-14 | ||||
| Mid GAMMA Investing LLC | $7,178 | 10.54% | 6,409 | Shares | Defined | 2026-04-06 | ||||
| Mega RHUMBLINE ADVISERS | $2,222 | 3.26% | 1,984 | Shares | Sole | 2026-05-12 | ||||
| No holders match your search. | ||||||||||