401(k) · DOL Form 5500 · 2023

Old Second Bancorp, Inc. 401(k) Plan

Data updated 2026-08-11

$89M
Total assets: 816
Participants: 90th
Percentile by assets: $109,050
Avg per participant

Official DOL plan name: Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust · Sponsored by Old Second Bancorp, Inc. · Illinois · Finance & Insurance

$89M in assets, 816 participants

Old Second Bancorp, Inc.'s Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust reported $89M in total assets and 816 participants in its 2023 DOL Form 5500 filing, ranking in the 90th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.

90th percentile by assets (of 127,072 plans)
#7,568 in Finance & Insurance (8,869 peers)

Where Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust sits by assets

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust sits in the top 10% of all filed plans by assets, $89M for 816 participants (~$109,050/participant), up 17.3% in 2023.

$89M
total plan assets (2023 EOY): 816
covered participants: 90th
percentile by assets (of 127,072 plans): $109,050
avg assets per participant

Where Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust sits by total assets

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust vs every filed plan by assets

End-of-year total assets · plan year 2023 · DOL Form 5500

$88,984,579 Top 10% higher than 90% of 127,068 filed plans

Dashed line + filled bar = this entry, among filed plans.

Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2023

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust reported net income rose from -$11M in the plan year 2022 filing to $13M in the plan year 2023 filing.
Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust end-of-year assets rose from $76M in the plan year 2022 filing to $89M in the plan year 2023 filing.
Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust reported participants fell from 882 in the plan year 2022 filing to 816 in the plan year 2023 filing.

See the national 2022→2023 release diff →

State

Illinois

Industry

Finance & Insurance

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust vs the 2023 asset distribution

By assets, Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust outranks 90% of the 127,072 plans that filed a Form 5500 for the 2023 plan year, and holds roughly 0.9x the national average plan size of $100M (721 average participants).

Scale-class filing particulars (2023)

Total Assets (Beginning of Year)	$76M
Net Assets (End of Year)	$89M
Net Income	$13M
Employer EIN	363143493
Plan Effective Date	1985-01-01
Filing Status	FILING RECEIVED

Sponsor Plan History (Old Second Bancorp, Inc.)

Total plan assets by year, all Old Second Bancorp, Inc. plans on file

Year	Plans	Participants	Total Assets
2022	1	882	$76M
2023	1	816	$89M
2024	1	852	$102M

Nearby 401(k) Plans in Illinois

Peer 401(k) plans, same state, same plan type, ranked by total assets.

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust vs. nearby 401(k) plans in Illinois, assets vs. participants

Accenture United States 401(k) Match Savings Plan $17.6B · 69,974
State Farm 401(k) Savings Plan $16.9B · 60,246
Abbott Laboratories Stock Retirement Plan $14.5B · 38,012
United Airlines Pilot Retirement Account Plan $14.4B · 14,959
Walgreens Retirement Savings Plan $13.4B · 235,331

Compare Old Second Bancorp, Inc. Employees' 401(… side-by-side with 3 peers →

Similar-Sized 401(k) Plans Nationally

401(k) plans in other states closest to Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust by total assets, not by location.

Associated Anesthesiologists, Inc. 401(k) Profit Sharing Plan (OK) $89M · 126
Institutional Investor Savings & Investment Plan (NY) $89M · 407
Grob Systems, Inc. Profit Sharing Plan (OH) $89M · 731
Webco Industries, Inc. Employee Investment Plan (OK) $89M · 1,387

Frequently Asked Questions

How did Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust assets move in 2023? ▼

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust grew sharply - up 17.3% during 2023, from $76M to $89M. Reported net income was $13M.

How have Old Second Bancorp, Inc. plan assets changed over time? ▼

Across 3 plan years on file (2022-2024), Old Second Bancorp, Inc.'s sponsor-wide assets grew 33.9%, from $76M to $102M.

Where does Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust rank by assets among Form 5500 filers? ▼

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust ranks in the 90th percentile by end-of-year assets among 127,072 plans that reported assets for plan year 2023 (in the top 10% of all filed plans by assets).

Which 401(k) plans are similar in size to Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust? ▼

Among 401(k) plans in other states, the closest by assets is Associated Anesthesiologists, Inc. 401(k) Profit Sharing Plan in OK ($89M, 126 participants).

Next read for Old Second Bancorp, Inc. Employees' 401(…

Scale reading

Ways to act on Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust's numbers.

By total assets, Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust ranks in the top 10% of all filed plans by assets. See the largest plans
Compare it side-by-side against 3 similar 401(k) plans in Illinois. Compare plans
Old Second Bancorp, Inc.'s sponsor-wide assets have grown 33.9% since 2022 across 3 plan years on file. More Finance & Insurance plans

Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), Form 5500 public disclosure dataset. Plan year 2023.

Source: DOL EFAST2 filing system (efast.dol.gov) - original filing retrieval by EIN 363143493.