Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MBBC held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | MALTESE CAPITAL MANAGEMENT LLC | 145K | $2.0M | 0.0% | 4.917% | 0.39% |
| 2 | ALLIANCEBERNSTEIN L.P. | 153K | $1.9M | 0.0% | 5.193% | 0.00% |
| 3 | RAFFLES ASSOCIATES LP | 108K | $1.5M | 0.0% | 3.649% | 1.26% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 77K | $1.0M | — | 2.596% | 0.00% |
| 5 | Minerva Advisors LLC | 59K | $798K | 0.0% | 1.999% | 0.52% |
| 6 | KLCM Advisors, Inc. | 34K | $464K | 0.0% | 1.163% | 0.06% |
| 7 | Stilwell Value LLC | 20K | $271K | 0.0% | 0.678% | 0.16% |
| 8 | VANGUARD FIDUCIARY TRUST CO | 16K | $222K | — | 0.557% | 0.00% |
| 9 | Tower Research Capital LLC (TRC) | 226 | $3K | -40.7% | 0.008% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MBBC — a direct measure of their conviction.
Filings activity in MBBC during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new MBBC position in Q1 2026
Institutions that fully closed their MBBC position in Q1 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 9 | +0.0% | 19.16% | +1.48 pp | $8M | +8.4% |
| Q4 2025 | 9 | 18% | 17.68% | +4.07 pp | $7M | +30% |
| Q3 2025 | 11 | 15% | 13.61% | +1.20 pp | $6M | +9.7% |
| Q2 2025 | 13 | +1200% | 12.41% | +11.62 pp | $5M | +1473% |
| Q1 2025 | 1 | +0.0% | 0.79% | 0.04 pp | $0M | 5.0% |
| Q4 2024 | 1 | +0.0% | 0.83% | +0.31 pp | $0M | +59% |
| Q3 2024 | 1 | +0.0% | 0.52% | +0.01 pp | $0M | +3.2% |
| Q2 2024 | 1 | — | 0.51% | — | $0M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as the highest-conviction signal because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 16, 2026 | Zillges Nicholas W | Buy | 970 | $15.00 | $15K |
| Jun 3, 2026 | Zillges Nicholas W | Buy | 203 | $13.75 | $3K |
| Jun 3, 2026 | Spatz Nora | Buy | 722 | $13.75 | $10K |
| Jun 3, 2026 | Knopf Michelle | Buy | 197 | $13.75 | $3K |
Quick answers to the most common questions about buying MBBC stock.
Based on Q1 2026 13F filings, institutional ownership of Marathon Bancorp, Inc. stands at 19.2%, held across 9 reporting institutions.
MALTESE CAPITAL MANAGEMENT LLC is the largest reported institutional holder of MBBC, with approximately 145,100 shares worth $0.00B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of MBBC.
Our composite Smart Money Score for MBBC is 47 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
2 institutions opened new positions in MBBC during Q1 2026, while 2 fully exited. 5 added to existing positions and 1 trimmed.
MBBC institutional ownership rose by 1.48 percentage points quarter-over-quarter, with a net change of +0 holders.
The top 10 institutions account for 100.0% of all reported 13F value in MBBC, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Marathon Bancorp, Inc. (MBBC) Institutional Ownership