Spatz Nora purchased ~$89K in Marathon Bancorp, Inc. Common Stock stock
Marathon Bancorp, Inc. Common Stock (MBBC) · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
Trade Details · Public SEC Filing
Insider
Spatz Nora
Role
—
Transaction
Open-Market Purchase
Approx. Value
~$89K
Trade Date
Jun 5, 2026
Company
Marathon Bancorp, Inc. Common Stock
Ticker
MBBCSource
SEC EDGAR Form 4
Why This Trade Stands Out
Strong conviction signal
Scored above average across multiple factors. Roughly 15% of insider trades qualify as Strong.
~$89K purchase
A personal investment by a corporate insider. Even smaller trades can be meaningful when combined with other factors like timing and role.
4 insiders traded in the same window
When multiple insiders independently buy within 30 days, it's called a cluster. Studies show clustered insider purchases outperform solo trades significantly, because several people with inside knowledge are reaching the same conclusion.
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Spatz Nora wasn't the only one buying.
4 insiders at Marathon Bancorp, Inc. Common Stock traded within the same 30-day window.
See who else bought · FreeOn June 5, 2026, Spatz Nora — a corporate insider at Marathon Bancorp, Inc. Common Stock — filed a Form 4 with the SEC disclosing an open-market purchase of approximately ~$89K in Marathon Bancorp, Inc. Common Stock (MBBC) stock.
This transaction was part of a cluster — 4 insiders at Marathon Bancorp, Inc. Common Stock made open-market purchases within the same 30-day window. Cluster activity from multiple independent insiders is one of the most studied patterns in insider trading research.
Under Section 16(a) of the Securities Exchange Act of 1934, corporate insiders must report all open-market stock transactions to the SEC within two business days. These filings — known as Form 4s — are publicly available on the SEC's EDGAR database. VeritySignals filters and scores the full Form 4 stream to surface high-conviction signals like this one.
VeritySignals Conviction Analysis
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All data sourced from publicly available SEC Form 4 filings via EDGAR · Not financial advice · Past performance does not guarantee future results.
At a Glance
More MBBC Insider Activity
Zillges Nicholas W
Jun 16, 2026
~$58K
VS
Spatz Nora
Jun 10, 2026
~$226K
STRONG
Zillges Nicholas W
Nov 26, 2025
~$37K
VS
How to Read Insider Trades
What is this?
When company executives buy or sell their own stock, they must report it to the SEC within 2 days. These public filings reveal what the people who know the company best are doing with their own money.
Why does it matter?
Insiders can sell for many reasons (taxes, diversification, expenses), but they generally only buy for one: they think the stock is going up. That's why insider purchases are more predictive than sales.
What makes a trade "strong"?
We score trades on 15+ factors: the insider's role (CEO > director), trade size relative to their salary, whether other insiders also bought (clusters), and historical accuracy of the insider.
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