Old Second Bancorp Inc (OSBC) — Institutional Investor Activity (Q2 2026)

OSBC ranks #3202 out of 37501 tracked stocks by institutional interest — one of the most closely watched names in our coverage.

OSBC is a top-conviction position for River Street Advisors LLC — at 5.3% of their entire disclosed 13F portfolio, it's one of their largest single bets, not just a passing allocation.

The largest dollar stake in OSBC belongs to BlackRock, Inc., but the position matters far more to River Street Advisors LLC, who has 5.3% of their own portfolio riding on it — a reminder that the biggest holder by size and the holder with the biggest bet aren't always the same fund.

California State Teachers Retirement System has added to its OSBC position for two straight quarters, increasing it by $50.3M to reach $51.2M today.

Wellington Management Group LLP has trimmed its OSBC position for two straight quarters, cutting it by $6.2M while still holding $12.7M.

OSBC is down 0% today, but institutions show net buying of $75.1M this quarter — a divergence between today's price move and the underlying institutional flow.

OSBC closed its latest fiscal year with net income of $80.3M.

• Profitable — net income of $80.3M in the latest fiscal year
• Revenue grew 12.1% year over year
• Net income declined year over year, from $85.3M to $80.3M
• Generated $122.3M in positive operating cash flow
• Liabilities run 6.70x equity — a highly leveraged balance sheet worth noting