Key Highlights

  • Old Second Bancorp (NASDAQ:OSBC) reported third-quarter 2026 adjusted earnings of USD 0.55 per diluted share on Wednesday, October 21, 2026, against the consensus estimate of USD 0.58, with GAAP earnings of USD 0.56.
  • The tax-equivalent net interest margin widened to 5.27% from 5.23% in the second quarter, but net interest income rose only USD 0.7 million to USD 84.0 million.
  • Total deposits fell USD 117.1 million, or 2.15%, to USD 5.33 billion as higher-rate brokered and exception-priced time deposits from Bancorp Financial rolled off.
  • Nonperforming loans fell to USD 39.6 million from USD 56.5 million and classified loans to USD 74.2 million from USD 132.1 million, while the company bought back about 3% of its shares.

A Rich Margin on a Shrinking Base

Old Second Bancorp (NASDAQ:OSBC), the parent of Old Second National Bank in Aurora, Illinois, released third-quarter 2026 results on Wednesday, October 21, 2026. Adjusted diluted earnings were USD 0.55 per share, against the consensus estimate of USD 0.58 and USD 0.55 in the second quarter. GAAP diluted earnings were USD 0.56, against USD 0.54 in the second quarter and USD 0.18 a year earlier. Net income was USD 28.9 million. The tax-equivalent net interest margin rose to 5.27% from 5.23% and 5.05% a year earlier, yet net interest income grew only 0.86% to USD 84.0 million. Total loans slipped USD 7.8 million to USD 5.24 billion, and deposits fell USD 117.1 million. The provision for credit losses was USD 6.8 million, against USD 7.5 million in the second quarter.

Why Margin Alone Did Not Lift Earnings

For Old Second Bancorp (NASDAQ:OSBC), net interest income depends on both the margin and the size of the earning asset base. The margin widened partly because expensive deposits left: brokered and exception-priced time deposits, meaning certificates paid above standard rates, rolled off after being assumed with Bancorp Financial. Shedding them lowers funding costs but also shrinks the balance sheet unless loans grow, and average loans rose only USD 4.0 million. The cost of deposits still edged up 2 basis points to 1.02%. Credit costs remained a drag, with a USD 6.8 million provision and charge-offs tied to powersport loans and one commercial relationship. Noninterest income slipped USD 191,000 to USD 13.1 million, and the efficiency ratio rose to 52.34% from 51.72%, leaving adjusted earnings flat on the quarter.

Risks and What to Watch

The first risk for Old Second Bancorp (NASDAQ:OSBC) is balance sheet shrinkage, since flat loans and falling deposits limit net interest income growth even at a 5.27% margin. The second is residual credit loss, as Chief Executive Officer Jim Eccher said loan losses stayed higher than wanted because of one previously identified commercial relationship. The third is the powersport book, which produced USD 3.1 million of charge-offs. On the positive side, criticised loans fell to 1.88% of loans from 3.05%, and Eccher said the bank believes it has "turned the corner on credit". Investors should watch the earnings call at 10:00 a.m. ET on Thursday, October 22, 2026, and the USD 0.08 dividend, payable on Monday, November 9, 2026 to holders of record on Friday, October 30, 2026.

Where Things Stand

The answer is that Old Second Bancorp (NASDAQ:OSBC) missed because a smaller balance sheet and elevated credit costs offset a wider margin. Adjusted earnings of USD 0.55 fell USD 0.03 short of the consensus estimate. Credit metrics improved sharply, and capital is strong, with a common equity Tier 1 ratio of 13.13% after repurchases of USD 39.5 million. The next catalysts are the October 22 call, the November 9 dividend payment and evidence that loan growth resumes. Dividends are not guaranteed, and this is not investment advice.