% of shares outstanding not shown: no SEC cover-page share count falls within 120 days of the 2026-Q1 quarter end, so any percentage would rest on a count that cannot speak for this quarter. Holder share counts are shown as filed.
Crowding percentile withheld — no market cap for MTHRY in the served universe — the cohort is size-matched, and an unmatched percentile would compare a micro-cap register to a mega-cap one.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | Sterling Capital Management LLC | 112,670112,670 | $568,522 | — | ADD 91% |
| 2 | RIVERBRIDGE PARTNERS LLC | 22,20222,202 | $113,008 | — | NEW |
| 3 | RHUMBLINE ADVISERS | 19,53519,535 | $99,422 | — | — |
| 4 | GAMMA Investing LLC | 18,08118,081 | $92,032 | — | TRIM -10% |
| 5 | PNC FINANCIAL SERVICES GROUP, INC. | 14,70914,709 | $74,869 | — | ADD 19% |
| 6 | Salomon & Ludwin, LLC | 259259 | $1,336 | — | TRIM -59% |
Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| Sterling Capital Management LLC | — | — | — | — | 59K | 113K | $568,522 |
| RIVERBRIDGE PARTNERS LLC | — | — | — | 11K | — | 22K | $113,008 |
| RHUMBLINE ADVISERS | 10K | 10K | 11K | 11K | 19K | 20K | $99,422 |
| GAMMA Investing LLC | 16K | 17K | 16K | 16K | 20K | 18K | $92,032 |
| PNC FINANCIAL SERVICES GROUP, INC. | — | — | — | — | 12K | 15K | $74,869 |
| Salomon & Ludwin, LLC | — | — | 16 | 494 | 628 | 259 | $1,336 |
Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.
Holder count only — too few computable %-of-shares-outstanding quarters for a % pane. Line breaks are quarters with no 13F record, never interpolated.
Short interest has its own tab now — open SI →
Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| Sterling Capital Management LLC | +53,564 | $272,641 | ADD |
| RIVERBRIDGE PARTNERS LLC | +22,202 | $113,008 | OPEN |
| PNC FINANCIAL SERVICES GROUP, INC. | +2,316 | $11,788 | ADD |
| RHUMBLINE ADVISERS | +305 | $1,552 | — |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| GAMMA Investing LLC | −2,079 | $10,582 | TRIM |
| Ancora Advisors LLC | −1,703 | $8,668 | CLOSE |
| Salomon & Ludwin, LLC | −369 | $1,878 | TRIM |
The 2025-Q4 register is as-filed in ITS OWN share basis; every count below was rebased into the 2026-Q1 basis (no split in between, factor 1). Dollar figures value the SHARE delta at one price — the 2026-03-31 close — rather than differencing two filings' own reported values, which would mix the quarter's price move into the trade figure.
13Fs disclose LONG US-listed positions only — shorts, most derivatives, bonds and non-US listings are invisible here, and a filer's quarter-over-quarter change is not necessarily a trade (index rebalances, in-kind transfers and entity successions all read as flow).
| Quarter | Holders | Shares held | % shares out | Value held |
|---|---|---|---|---|
| 2026-Q1 | 6 | 187,456 | — | $949,189 |
| 2025-Q4 | 6 | 113,220 | — | $758,992 |
| 2025-Q3 | 4 | 38,215 | — | $318,797 |
| 2025-Q2 | 3 | 26,796 | — | $181,405 |
| 2025-Q1 | 2 | 26,406 | — | $145,232 |
| 2024-Q4 | 2 | 26,461 | — | $114,572 |
| 2024-Q3 | 2 | 19,305 | — | $95,363 |
| 2024-Q2 | 2 | 13,065 | — | $62,317 |
| 2024-Q1 | 2 | 15,140 | — | $108,552 |
| 2023-Q4 | 2 | 6,390 | — | $51,876 |
| 2023-Q3 | 1 | 1,614 | — | $14,687 |
| 2023-Q2 | 2 | 58,812 | — | $632,594 |
| 2023-Q1 | 1 | 57,888 | — | $721,584 |
| 2022-Q4 | 1 | 67,991 | — | $922,000 |
| 2022-Q3 | 1 | 67,935 | — | $951,000 |
| 2022-Q2 | 1 | 68,518 | — | $983,000 |
| 2022-Q1 | 1 | 68,518 | — | $1M |
| 2021-Q4 | 1 | 68,555 | — | $2M |
| 2021-Q3 | 1 | 69,056 | — | $2M |
| 2021-Q2 | 1 | 73,093 | — | $3M |
| 2021-Q1 | 1 | 78,114 | — | $3M |
