Schedule 13G filing

DIMENSIONAL FUND ADVISORS LP disclosed a 5.1% stake in Old Second Bancorp Inc (OSBC)

Schedule 13G · Filed Oct 8, 2026

DIMENSIONAL FUND ADVISORS LP reported owning 5.1% of Old Second Bancorp Inc (OSBC) (2,575,752 shares) in a Schedule 13G filed Oct 8, 2026.

A 13G is a passive stake: the holder does not plan to push for changes.

Stake

Old Second Bancorp Inc

Stake

5.1% stake

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From a public Schedule 13G, linked above. Not investment advice, and not a recommendation to buy or sell.