Marathon Bancorp, Inc. /MD/ (Nasdaq: MBBC), an SEC filer in Savings Institutions, Not Federally Chartered, closed at $15.23, -1.1%, on 2026-08-28, with a market cap of $45M as of 2026-08-27, a trailing P/E of 770.0, a return on equity of 0.1%, a net margin of 0.6% and 3-year sales growth of -2.5%. Institutional ownership, earnings history and filed financials are on the tabs below.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | MALTESE CAPITAL MANAGEMENT LLC | 145,100145,100 | $2M | 4.94% | — |
| 2 | ALLIANCEBERNSTEIN L.P. | 153,238153,238 | $2M | 5.21% | — |
| 3 | RAFFLES ASSOCIATES LP | 107,664107,664 | $1M | 3.66% | — |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 76,59876,598 | $1M | 2.61% | NEW† |
| 5 | Minerva Advisors LLC | 58,97658,976 | $797,946 | 2.01% | — |
| 6 | KLCM Advisors, Inc. | 34,32034,320 | $464,350 | 1.17% | — |
| 7 | STILWELL VALUE LLC | 20,00020,000 | $270,600 | 0.68% | — |
| 8 | VANGUARD FIDUCIARY TRUST CO | 16,43416,434 | $222,352 | 0.56% | NEW |
| 9 | Tower Research Capital LLC (TRC) | 226226 | $3,058 | 0.01% | TRIM -41% |
† NEW this big is usually a rename.
Ranked by each filer’s own reported value, not shares.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | +76,598 | $1M | OPEN |
| VANGUARD FIDUCIARY TRUST CO | +16,434 | $222,352 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD GROUP INC | −93,032 | $1M | CLOSE |
| Tower Research Capital LLC (TRC) | −155 | $2,097 | TRIM |
| BANK OF AMERICA CORP /DE/ | −15 | $203 | CLOSE |
Prior quarter split-rebased · 13Fs are long, US-listed only.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| MALTESE CAPITAL MANAGEMENT LLC | — | — | 135K | 135K | 145K | 145K | $2M |
| ALLIANCEBERNSTEIN L.P. | — | — | 90K | 133K | 153K | 153K | $2M |
| RAFFLES ASSOCIATES LP | — | — | 108K | 108K | 108K | 108K | $1M |
| VANGUARD CAPITAL MANAGEMENT LLC | — | — | — | — | — | 77K | $1M |
| Minerva Advisors LLC | — | — | 55K | 59K | 59K | 59K | $797,946 |
| KLCM Advisors, Inc. | — | — | — | — | 34K | 34K | $464,350 |
| STILWELL VALUE LLC | — | — | 20K | 20K | 20K | 20K | $270,600 |
| VANGUARD FIDUCIARY TRUST CO | — | — | — | — | — | 16K | $222,352 |
| Tower Research Capital LLC (TRC) | — | — | 674 | 367 | 381 | 226 | $3,058 |
Green = added, red = trimmed, grey = held; a dash is a quarter with no 13F on file — a gap, not an exit.
Breaks = no 13F that quarter.
Short interest has its own tab now — open SI →
SEC Form 13F · ~10,250 filers, 10y · long-only, US-listed, filed ≤45d after quarter-end.
