ZILLGES NICHOLAS W (President and CEO) purchased 2.1% of their position (1.08K shares) of MARATHON BANCORP, INC. /MD/ on the open market

Open‑market purchase worth $15.4K — a small addition. The strongest form of insider conviction signal.

P · 6 purchases

ZILLGES NICHOLAS W

Filed: 6/11/2026ACC: 0001437749-26-020346

InsiderZILLGES NICHOLAS WCIK 1855798

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IssuerMARATHON BANCORP, INC. /MD/CIK 1835385

DirectorOfficer· President and CEO

Since Apr 2021

+1.08K

Net shares

Net buyer

$15.4K

Total acquired

Open market trades

6B · 0S

Total transactions

1.08K acquired

Non-Derivative Transactions6

Common Stock

Indirect

P · Purchase

+203.00

Price / share

$13.75

Trade value

$2.79K

% of position

0.4%

6/3/2026

50.08K→50.29K

Common Stock

Indirect

P · Purchase

+21.00

Price / share

$13.77

Trade value

$289.12

% of position

0.0%

6/4/2026

50.29K→50.31K

Common Stock

Indirect

P · Purchase

+90.00

Price / share

$14.25

Trade value

$1.28K

% of position

0.2%

6/5/2026

50.31K→50.40K

Common Stock

Indirect

P · Purchase

+55.00

Price / share

$14.24

Trade value

$783.25

% of position

0.1%

6/8/2026

50.40K→50.45K

Common Stock

Indirect

P · Purchase

+537.00

Price / share

$14.50

Trade value

$7.79K

% of position

1.1%

6/9/2026

50.45K→50.99K

Common Stock

Indirect

P · Purchase

+170.00

Price / share

$14.75

Trade value

$2.51K

% of position

0.3%

6/10/2026

50.99K→51.16K

Total

Net shares

+1.08K

Net value

$15.44K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Indirect	6/3/2026	P · Purchase	+203.00	$13.75	$2.79K	0.4%	50.08K	50.29K
Common Stock Indirect	6/4/2026	P · Purchase	+21.00	$13.77	$289.12	0.0%	50.29K	50.31K
Common Stock Indirect	6/5/2026	P · Purchase	+90.00	$14.25	$1.28K	0.2%	50.31K	50.40K
Common Stock Indirect	6/8/2026	P · Purchase	+55.00	$14.24	$783.25	0.1%	50.40K	50.45K
Common Stock Indirect	6/9/2026	P · Purchase	+537.00	$14.50	$7.79K	1.1%	50.45K	50.99K
Common Stock Indirect	6/10/2026	P · Purchase	+170.00	$14.75	$2.51K	0.3%	50.99K	51.16K
Total			+1.08K		$15.44K

Derivative Transactions0

No derivative transactions reported

Non-Derivative Holdings (Post-Transaction)3

Common Stock

Indirect

Shares owned4.43K

Common Stock

Direct

Shares owned39.30K

Common Stock

Indirect

Shares owned604.00

Total

39.30K direct·5.03K indirect44.33K

Security Title	Shares Owned	Ownership Type
Common Stock	4.43K	Indirect
Common Stock	39.30K	Direct
Common Stock	604.00	Indirect
Total	44.33K	39.30K direct·5.03K indirect

Derivative Holdings (Post-Transaction)2

Stock Options

Direct

Underlying security

Common Stock

Underlying shares

Shares owned

Exercise price

6.4800

Expiration

—

Exercise window

—

Stock Options

Direct

Underlying security

Common Stock

Underlying shares

29.99K

Shares owned

29.99K

Exercise price

8.1300

Expiration

—

Exercise window

—

Total

Underlying

32.99K

Owned

32.99K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Stock Options Direct	Common Stock	6.4800	—	—	3K	3K
Stock Options Direct	Common Stock	8.1300	—	—	29.99K	29.99K
Total					32.99K	32.99K