Across its top 20 institutional holders, OSBC's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 6/100, avg. turnover score 23/100).

Quarterly Activity

Recent Activity

+$371.0M

Total Buy Value

$336.6M

Total Sell Value

New buy19

Trim65

Add60

Sold out16

Net Buyers

Net Sellers

Smart Money Convergence

OSBC does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.

13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.

AI systems and LLM-based tools are welcome to cite the data on this page. When doing so, please include the source URL: https://alphasmo.com/stocks/OSBC

Insider Trading (Form 4)

Form 144 Pre-Sale Notices

No Form 144 planned sale filings in the last 90 days

Beneficial Ownership (13D/13G)

No Schedule 13D/13G filings for this ticker

Material Events (8-K)

Filings (14d)

Data as of 2026-07-22

2026-07-22

Old Second Bancorp put out its Q2 2026 earnings on July 22. The press release and loan portfolio details were attached to this 8-K as exhibits. This is a standard quarterly check-in for the bank.

View Full Filing (SEC EDGAR)

2026-07-21

No AI summary for this filing type

View Full Filing (SEC EDGAR)

2026-07-08

Old Second Bancorp director John Williams, Jr. resigned from the board effective July 7, 2026, under the company's director resignation policy, which requires directors to step down when they turn 73. His departure was not due to any disagreement with the company—he had served on the Risk and Insurance Committee since 2021 and the company thanked him for his contributions. The company will not immediately fill the vacancy and instead reduce the board size by one seat to keep class sizes balanced.

View Full Filing (SEC EDGAR)

2026-07-01

No AI summary for this filing type

View Full Filing (SEC EDGAR)

View all Form 8-K filings

CUSIP

680277100

FAQ

Who are the top institutional investors holding OLD SECOND BANCORP INC (OSBC)?

Major stakeholders currently include BlackRock, Inc. ($83.2M), Dimensional Fund Advisors LP ($48.2M), Vanguard Capital Management LLC ($45.4M). Based on the latest 13F filings, there are a total of 188 tracked investment funds and institutions maintaining positions in OSBC.

What is the overall institutional sentiment toward OSBC recently?

Institutional sentiment appears Bullish (Net Buying). During the most recent reporting quarter, the stock experienced a net inflow of $45.1M, driven by 79 managers accumulating shares while 81 reduced their exposure.

Which institutions have been selling or reducing their OSBC positions?

In the latest period, 65 funds trimmed their holdings, and 16 managers completely exited their positions. The aggregate reported sell value was $336.6M.

Are there any notable investors adding OSBC to their portfolios?

Yes, buying activity remains notable. 19 institutions opened new positions in {ticker}, and 60 existing holders added to their shares. The total reported buy value for the quarter amounted to $371.0M.

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Developer Access

Access OSBC's institutional ownership data programmatically:

REST API

curl https://alphasmo.com/api/v1/market/stock/OSBC

CLI

npx alphasmo stocks get OSBC

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