Monitor for any future conversion to a Schedule 13D, which would signal activist intent. Dimensional is a quantitative manager and rarely engages in activism, so this is likely a passive position. No immediate catalyst.
Price Chart
Executive Summary
Dimensional Fund Advisors LP disclosed a 5.1% passive stake in Old Second Bancorp Inc via a new Schedule 13G filing, reporting beneficial ownership of 2,575,752 shares as of September 30, 2026. This is a routine passive filing by a large quantitative asset manager, indicating no intent to influence management.
Key Financial Metrics
Key Facts
- Dimensional Fund Advisors LP filed a new Schedule 13G disclosing a 5.1% passive stake in Old Second Bancorp Inc.
- The stake consists of 2,575,752 shares of common stock, with sole voting power over 2,531,900 shares and sole dispositive power over 2,575,752 shares.
- The filing certifies the securities were acquired in the ordinary course of business and not with the purpose of changing or influencing control.
- Dimensional is an investment adviser registered under the Investment Advisers Act of 1940, managing assets for various funds and accounts.
Financial Impact
5.1% of shares outstanding, valued at approximately $42.1 million based on a $16.35/share reference price (not from filing).
Risk Factors
- No material risks identified from this passive filing.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G Filing (Primary) | 0000354204-26-001084 |
| Document: 0000354204-26-001084-index.html | 0000354204-26-001084 |
| Document: 0000354204-26-001084.txt | 0000354204-26-001084 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 21, 2026 5d ago | 8-K | $24.71 | awaiting T+5 | — | $24.55 (−0.65%) |
Oct 20, 2026 7d ago | 8-K | $25.10 | awaiting T+5 | — | $24.55 (−2.19%) |
Oct 19, 2026 7d ago | 8-K | $25.10 | awaiting T+5 | — | $24.55 (−2.19%) |
Oct 8, 2026 19d ago | SC 13G | $24.86 $24.85 | ▼ −0.04% | ▲ +0.24% | $24.55 (−1.25%) |
Oct 1, 2026 26d ago | 8-K | $24.63 $24.86 | ▲ +0.93% | ▼ −0.37% | $24.55 (−0.32%) |
Sep 11, 2026 6w ago | Insider Cluster | $25.58 $24.99 | ▲ +2.31% | ▲ +2.09% | $24.55 (+4.03%) |
Sep 8, 2026 6w ago | Insider Cluster | $25.26 $24.98 | ▼ −1.11% | ▼ −0.01% | $24.55 (−2.81%) |
Aug 18, 2026 9w ago | S-3ASR | $25.66 $25.19 | ▼ −1.83% | ▼ −1.63% | $24.55 (−4.33%) |
Jul 21, 2026 14w ago | 8-K | $23.68 $24.72 | ▲ +4.39% | ▲ +5.62% | $24.55 (+3.67%) |
Jul 8, 2026 15w ago | 8-K | $22.71 $23.01 | ▲ +1.32% | ▲ +0.46% | $24.55 (+8.10%) |
US Market Status
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