MBBC
insider transactionsMarathon Bancorp, Inc. /MD/ — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Cluster buy signal: Multiple insiders at the same company buying around the same time — often a stronger signal than a single buy. 4 different insiders made open-market purchases in the last 90 days, totalling $119.7K.
Net shares · 90d
+8.3K
8.3K buy · 0 sell
Net value · 90d
$119.7K
$119.7K in · $0 out
Sentiment · 90d
Net buying
100% buying · 0% selling
Open-market trades · 90d
25
8.3K buy · 0 sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
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Buy·P
President and CEO
$14.6K
970 sh · $15.00
Own +2%
-
Grant·A
Director
$0
8.5K sh
Own New
-
Grant·A
Director
$0
3.4K sh
Own +66%
-
Grant·A
Director
$0
8.5K sh
Own New
-
Grant·A
Director
$0
3.4K sh
Own +113%
-
Grant·A
Director
$0
8.5K sh
Own New
-
Grant·A
Director
$0
3.4K sh
Own +14%
-
Grant·A
President and CEO
$0
42.3K sh
Own New
-
Grant·A
President and CEO
$0
16.9K sh
Own +43%
-
Grant·A
EVP and CAO
$0
11.0K sh
Own New
-
Grant·A
EVP and CAO
$0
6.5K sh
Own +30%
-
Grant·A
EVP and COO
$0
10.0K sh
Own New
-
Grant·A
EVP and COO
$0
5.5K sh
Own +164%
-
Grant·A
Director
$0
8.5K sh
Own New
-
Grant·A
Director
$0
3.4K sh
Own +113%
-
Grant·A
SVP and CCO
$0
7.0K sh
Own New
-
Grant·A
SVP and CCO
$0
3.5K sh
Own +117%
-
Buy·P
President and CEO
$2.5K
170 sh · $14.75
Own +0%
-
Buy·P
EVP and CAO
$8.9K
602 sh · $14.75
Own +2%
-
Buy·P
EVP and COO
$2.4K
164 sh · $14.75
Own +1%
-
Buy·P
SVP and CCO
$3.2K
219 sh · $14.75
Own +1%
-
Buy·P
President and CEO
$7.8K
537 sh · $14.50
Own +1%
-
Buy·P
EVP and CAO
$27.6K
1.9K sh · $14.50
Own +5%
-
Buy·P
EVP and COO
$7.5K
519 sh · $14.50
Own +3%
-
Buy·P
SVP and CCO
$10.0K
693 sh · $14.50
Own +3%
-
Buy·P
President and CEO
$783
55 sh · $14.24
Own +0%
-
Buy·P
EVP and CAO
$2.8K
197 sh · $14.24
Own +1%
-
Buy·P
EVP and COO
$769
54 sh · $14.24
Own +0%
-
Buy·P
SVP and CCO
$1.0K
71 sh · $14.24
Own +0%
-
Buy·P
President and CEO
$1.3K
90 sh · $14.25
Own +0%
-
Buy·P
EVP and CAO
$4.6K
320 sh · $14.25
Own +1%
-
Buy·P
EVP and COO
$1.2K
87 sh · $14.25
Own +0%
-
Buy·P
SVP and CCO
$1.7K
116 sh · $14.25
Own +0%
-
Buy·P
President and CEO
$289
21 sh · $13.77
Own +0%
-
Buy·P
EVP and CAO
$1.0K
74 sh · $13.77
Own +0%
-
Buy·P
EVP and COO
$275
20 sh · $13.77
Own +0%
-
Buy·P
SVP and CCO
$372
27 sh · $13.77
Own +0%
-
Exercise·M
Director
$0
899 sh
Own New
-
Exercise·M
Director
$0
3.6K sh
Own New
-
Exercise·M
Director
$5.8K
899 sh · $6.48
Own +4%
-
Exercise·M
Director
$29.3K
3.6K sh · $8.13
Own +19%
-
Exercise·M
EVP and CAO
$0
1.2K sh
Own +100%
-
Exercise·M
EVP and CAO
$9.8K
1.2K sh · $8.13
Own +6%
-
Exercise·M
President and CEO
$0
1.5K sh
Own +100%
-
Exercise·M
President and CEO
$9.7K
1.5K sh · $6.48
Own +4%
-
Exercise·M
Director
$0
899 sh
Own New
-
Exercise·M
Director
$0
3.6K sh
Own New
-
Exercise·M
Director
$5.8K
899 sh · $6.48
Own +7%
-
Exercise·M
Director
$29.3K
3.6K sh · $8.13
Own +38%
-
Exercise·M
Director
$0
300 sh
Own +100%
-
Exercise·M
Director
$1.9K
300 sh · $6.48
Own +1%
-
Buy·P
President and CEO
$2.8K
203 sh · $13.75
Own +0%
-
Buy·P
EVP and CAO
$9.9K
722 sh · $13.75
Own +2%
-
Buy·P
EVP and COO
$2.7K
197 sh · $13.75
Own +1%
-
Buy·P
SVP and CCO
$3.6K
263 sh · $13.75
Own +1%
-
Other·F
SVP and CFO
$812
56 sh · $14.50
Own -1%
-
Other·F
EVP and CAO
$435
30 sh · $14.50
Own -0%
-
Other·F
EVP and COO
$1.2K
86 sh · $14.50
Own -3%
-
Other·F
SVP and CCO
$594
41 sh · $14.50
Own -1%
-
Exercise·M
Director
$0
599 sh
Own +199%
-
Exercise·M
Director
$0
899 sh
Own New
-
Exercise·M
Director
$3.9K
599 sh · $6.48
Own +13%
-
Exercise·M
Director
$7.3K
899 sh · $8.13
Own +25%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 16, 2026 | Nicholas W Zillges KEY | Buy P | 970 | $14.6K |
| Jun 15, 2026 | Ann M Werth | Grant A | 8.5K | $0 |
| Jun 15, 2026 | Ann M Werth | Grant A | 3.4K | $0 |
| Jun 15, 2026 | Timothy R Wimmer | Grant A | 8.5K | $0 |
| Jun 15, 2026 | Timothy R Wimmer | Grant A | 3.4K | $0 |
| Jun 15, 2026 | Amy Zientara | Grant A | 8.5K | $0 |
| Jun 15, 2026 | Amy Zientara | Grant A | 3.4K | $0 |
| Jun 15, 2026 | Nicholas W Zillges KEY | Grant A | 42.3K | $0 |
| Jun 15, 2026 | Nicholas W Zillges KEY | Grant A | 16.9K | $0 |
| Jun 15, 2026 | Nora Spatz | Grant A | 11.0K | $0 |
| Jun 15, 2026 | Nora Spatz | Grant A | 6.5K | $0 |
| Jun 15, 2026 | Michelle Knopf | Grant A | 10.0K | $0 |
| Jun 15, 2026 | Michelle Knopf | Grant A | 5.5K | $0 |
| Jun 15, 2026 | Thomas L Grimm | Grant A | 8.5K | $0 |
| Jun 15, 2026 | Thomas L Grimm | Grant A | 3.4K | $0 |
| Jun 15, 2026 | Terry Cornish | Grant A | 7.0K | $0 |
| Jun 15, 2026 | Terry Cornish | Grant A | 3.5K | $0 |
| Jun 10, 2026 | Nicholas W Zillges KEY | Buy P | 170 | $2.5K |
| Jun 10, 2026 | Nora Spatz | Buy P | 602 | $8.9K |
| Jun 10, 2026 | Michelle Knopf | Buy P | 164 | $2.4K |
| Jun 10, 2026 | Terry Cornish | Buy P | 219 | $3.2K |
| Jun 9, 2026 | Nicholas W Zillges KEY | Buy P | 537 | $7.8K |
| Jun 9, 2026 | Nora Spatz | Buy P | 1.9K | $27.6K |
| Jun 9, 2026 | Michelle Knopf | Buy P | 519 | $7.5K |
| Jun 9, 2026 | Terry Cornish | Buy P | 693 | $10.0K |
| Jun 8, 2026 | Nicholas W Zillges KEY | Buy P | 55 | $783 |
| Jun 8, 2026 | Nora Spatz | Buy P | 197 | $2.8K |
| Jun 8, 2026 | Michelle Knopf | Buy P | 54 | $769 |
| Jun 8, 2026 | Terry Cornish | Buy P | 71 | $1.0K |
| Jun 5, 2026 | Nicholas W Zillges KEY | Buy P | 90 | $1.3K |
| Jun 5, 2026 | Nora Spatz | Buy P | 320 | $4.6K |
| Jun 5, 2026 | Michelle Knopf | Buy P | 87 | $1.2K |
| Jun 5, 2026 | Terry Cornish | Buy P | 116 | $1.7K |
| Jun 4, 2026 | Nicholas W Zillges KEY | Buy P | 21 | $289 |
| Jun 4, 2026 | Nora Spatz | Buy P | 74 | $1.0K |
| Jun 4, 2026 | Michelle Knopf | Buy P | 20 | $275 |
| Jun 4, 2026 | Terry Cornish | Buy P | 27 | $372 |
| Jun 3, 2026 | Amy Zientara | Exercise M | 899 | $0 |
| Jun 3, 2026 | Amy Zientara | Exercise M | 3.6K | $0 |
| Jun 3, 2026 | Amy Zientara | Exercise M | 899 | $5.8K |
| Jun 3, 2026 | Amy Zientara | Exercise M | 3.6K | $29.3K |
| Jun 3, 2026 | Nora Spatz | Exercise M | 1.2K | $0 |
| Jun 3, 2026 | Nora Spatz | Exercise M | 1.2K | $9.8K |
| Jun 3, 2026 | Nicholas W Zillges KEY | Exercise M | 1.5K | $0 |
| Jun 3, 2026 | Nicholas W Zillges KEY | Exercise M | 1.5K | $9.7K |
| Jun 3, 2026 | Timothy R Wimmer | Exercise M | 899 | $0 |
| Jun 3, 2026 | Timothy R Wimmer | Exercise M | 3.6K | $0 |
| Jun 3, 2026 | Timothy R Wimmer | Exercise M | 899 | $5.8K |
| Jun 3, 2026 | Timothy R Wimmer | Exercise M | 3.6K | $29.3K |
| Jun 3, 2026 | Thomas L Grimm | Exercise M | 300 | $0 |
| Jun 3, 2026 | Thomas L Grimm | Exercise M | 300 | $1.9K |
| Jun 3, 2026 | Nicholas W Zillges KEY | Buy P | 203 | $2.8K |
| Jun 3, 2026 | Nora Spatz | Buy P | 722 | $9.9K |
| Jun 3, 2026 | Michelle Knopf | Buy P | 197 | $2.7K |
| Jun 3, 2026 | Terry Cornish | Buy P | 263 | $3.6K |
| May 16, 2026 | Joy Selting-Buchberger KEY | Other F | 56 | $812 |
| May 16, 2026 | Nora Spatz | Other F | 30 | $435 |
| May 16, 2026 | Michelle Knopf | Other F | 86 | $1.2K |
| May 16, 2026 | Terry Cornish | Other F | 41 | $594 |
| May 5, 2026 | Ann M Werth | Exercise M | 599 | $0 |
| May 5, 2026 | Ann M Werth | Exercise M | 899 | $0 |
| May 5, 2026 | Ann M Werth | Exercise M | 599 | $3.9K |
| May 5, 2026 | Ann M Werth | Exercise M | 899 | $7.3K |
About MBBC insider trading
This page tracks insider transactions for Marathon Bancorp, Inc. /MD/ (MBBC) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.