MEDIROM Healthcare Technologies Inc.
MEDIROM Healthcare Technologies Inc. (MRM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MRM · as of Sep 30, 2025
Ownership Breakdown
4
Institutional Holders
▼ 2 vs Q2
$348,461
Total Inst. Value
▲ $245,616 vs Q2
5.11M
Shares Outstanding
freeFloat 73.58%
164,369
13F Shares Held
▲ 91,657 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MRM largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 7 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
JANE STREET GROUP, LLC services-personal services | 155.1K | 3.04% | 3.04% | $328.75M | Nov 14, 2025 | NEW |
GAMMA INVESTING LLC services-personal services | 4.6K | 9.03% | 9.03% | $9.78M | Oct 2, 2025 | ▲ 4.5K |
TOWER RESEARCH CAPITAL LLC (TRC) services-personal services | 3.4K | 6.61% | 6.61% | $7.16M | Nov 14, 2025 | ▲ 3.4K |
RHUMBLINE ADVISERS services-personal services | 1.3K | 2.56% | 2.56% | $2.77M | Nov 6, 2025 | ▲ 207 |
CITADEL ADVISORS LLC services-personal services | 0 | 0.00% | 0.00% | $0 | Nov 14, 2025 | EXIT |
UBS GROUP AG services-personal services | 0 | 0.00% | 0.00% | $0 | Nov 13, 2025 | EXIT |
MARINER, LLC services-personal services | 0 | 0.00% | 0.00% | $0 | Nov 14, 2025 | EXIT |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
3
Increased
+8.1K shares1
New Positions
first time holders0
Decreased
−0 shares3
Sold Out
fully exitedNet shares change (top 50)
+8.1K
+8.1K / −0
Net new holders
+1
1 new / 3 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MRM insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
COHEN EDWARD H director | Feb 3, 2010 | U-Tender | 17,000 | $16.00 | $272.0K | 3.0K | Form 4 ↗ |
COHEN EDWARD H director | Feb 3, 2010 | D-Return | 2,500 | $9.52 | $23.8K | 0 | Form 4 ↗ |
COHEN EDWARD H director | Feb 3, 2010 | D-Return | 2,500 | $9.78 | $24.4K | 0 | Form 4 ↗ |
COHEN EDWARD H director | Feb 3, 2010 | D-Return | 2,500 | $5.15 | $12.9K | 0 | Form 4 ↗ |
COHEN EDWARD H director | Feb 3, 2010 | D-Return | 2,500 | $7.82 | $19.6K | 0 | Form 4 ↗ |
COHEN EDWARD H director | Feb 3, 2010 | D-Return | 2,500 | $8.95 | $22.4K | 0 | Form 4 ↗ |
COHEN EDWARD H director | Feb 3, 2010 | D-Return | 3,000 | $16.00 | $48.0K | 0 | Form 4 ↗ |
COHEN EDWARD H director | Jun 24, 2009 | Award | 1,500 | — | — | 20.0K | Form 4 ↗ |
COHEN EDWARD H director | Jun 24, 2009 | Award | 2,500 | $7.82 | $19.6K | 2.5K | Form 4 ↗ |
COHEN EDWARD H director | Jun 11, 2009 | Sale | 2,500 | $11.18 | $27.9K | 18.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
MEDIROM Healthcare Technologies Inc. (MRM) is primarily owned by institutional investors, who hold approximately 3.2% of total shares outstanding. Company insiders own approximately 26.42%, while retail and public investors account for the remaining 70.36%.
The largest institutional shareholder of MEDIROM Healthcare Technologies Inc. is JANE STREET GROUP, LLC, holding approximately 155,071 shares — equal to 3.04% of outstanding shares — as of September 30, 2025.
A total of 4 institutional investors currently hold MRM stock, with a combined institutional value of approximately $348,461 as of the most recent 13F filing period.
Frequently asked questions
MRM ownershipMEDIROM Healthcare Technologies Inc. (MRM) is primarily owned by institutional investors, who hold approximately 3.2% of shares. The largest shareholder is JANE STREET GROUP, LLC with a 3.04% stake. Company insiders hold 26.42%. Data sourced from SEC Form 13F as of September 30, 2025.