MBBC: Overcapitalized, Underleveraged, and Worth Watching

Marathon Bancorp, Inc. | NASDAQ: MBBC | Published 11/05/2026

 

Introduction

Marathon Bancorp (ticker: MBBC) is a $261 million community bank headquartered in Wausau, Wisconsin. Founded in 1902, it operates five branches and uplisted from OTC to Nasdaq in April 2025 — which means only two periods of peer-comparable data exist for this analysis. In those two periods, the story has changed considerably.

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ROA was essentially zero in March 2025 and had moved meaningfully by April 2026 — but the peer gap remains wide, and the expense story explains why. The loan book is real-estate heavy and fixed-rate oriented, which shapes the interest rate picture in ways worth understanding before drawing a conclusion on NIM trajectory.

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Credit is the cleanest part of this story — possibly the cleanest in the peer group. Zero classified loans, essentially zero provision expense. Meanwhile, MBBC carries roughly twice the capital of a typical peer bank, which explains a lot about the ROA trajectory and raises an interesting question about where that capital goes next.

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On pricing: the stock trades at a discount to book. Whether that’s cheap depends entirely on what you think the earnings trajectory looks like. The full analysis makes the case either way.

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Full Analysis

The remainder of this analysis is available to paid subscribers. See the rest of the analysis here: MBBC - Marathon Bancorp, Inc.: Full Analysis