401(k) · DOL Form 5500 · 2023

Old Second Bancorp, Inc. 401(k) Plan

Data updated 2026-08-25

$89M
Total assets Below avg plan size
816
Participants Near avg headcount
90th
Percentile by assets National rank
$109,050
Avg per participant Below avg balance/head
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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.

  • #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.

#7,568
in Finance & Insurance (8,869 peers)
+17.3%
assets growth YoY
0.9×
vs typical plan assets (national mean)

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust's outsized position 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

This plan $0 $2,050,000,000 every filed plan with reported assets, bucketed by value

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 among mid-size filed plans by headcount

Plan-year 2023 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust sits mid-pack in the medium band (816 participants).

What changed between DOL Form 5500 filings

plan year 2022 → 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 →

Plan-year Form 5500 strip

Filing strip 363143493 · Old Second Bancorp, Inc. PY 2023 · 401(k)

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust · $89M · 816 · 90th

  • NET $89M
  • NET 816
  • NET 90th
  • NET 401(k)
  • NET near Associated Anesthesiologists, Inc. 401(k) Profit Sharing Plan
  • NET ind #7568

Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Finance & Insurance retirement plans → · Plans in Illinois →

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust in the asset neighbourhood

Webco Industries, Inc. Employee Investment PlanWebco Industries, Inc. Emplo…$89MGrob Systems, Inc. Profit Sharing PlanGrob Systems, Inc. Profit Sh…$89MAssociated Anesthesiologists, Inc. 401(k) Profit Sharing PlanAssociated Anesthesiologists…$89MInstitutional Investor Savings & Investment PlanInstitutional Investor Savin…$89MOld Second Bancorp, Inc. Employees' 401(k) Savings Plan & TrustOld Second Bancorp, Inc. Emp…$89M
End-of-year total assets ($M) among Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust and nearest nationwide 401(k) peers. Source: DOL Form 5500 plan year 2023.

Scale-class filing particulars (2023)

Total Assets (Beginning of Year)$76M
Net Assets (End of Year)$89M
Net Income$13M
Employer EIN363143493
Plan Effective Date1985-01-01
Filing StatusFILING RECEIVED

Sponsor Plan History (Old Second Bancorp, Inc.)

Sponsor-wide plan assets over time

All Old Second Bancorp, Inc. plans reported in each filing year

Latest sponsor-wide plan assets
$102M 33.93921303486988% vs 2022
2024 filing year
$70M$80M$90M$100M$110M 202220232024 $75.8M $102M ▲ +33.9%
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 Scatter plot of 6 data points. -1000000100000200000300000 -505101520 Total assets ($B) Participants Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust, Total assets ($B): 0.088984579 · Participants: 816Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & TrustAccenture United States 401(k) Match Savings Plan, Total assets ($B): 17.594548115 · Participants: 69974Accenture United States 401(k) Match Savings PlanState Farm 401(k) Savings Plan, Total assets ($B): 16.935002041 · Participants: 60246State Farm 401(k) Savings PlanAbbott Laboratories Stock Retirement Plan, Total assets ($B): 14.496191 · Participants: 38012Abbott Laboratories Stock Retirement PlanUnited Airlines Pilot Retirement Account Plan, Total assets ($B): 14.367975914 · Participants: 14959United Airlines Pilot Retirement Account PlanWalgreens Retirement Savings Plan, Total assets ($B): 13.444551767 · Participants: 235331Walgreens Retirement Savings Plan
Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust vs. nearby 401(k) plans in Illinois, assets vs. participants
Compare Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust side-by-side with 3 peers →

Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust's out-of-state 401(k) peers by assets and headcount

Outside Illinois, the nearest 401(k) by assets is Associated Anesthesiologists, Inc. 401(k) Profit Sharing Plan in OK ($89M); by covered participants it is Public Company Accounting Oversight Board Investment & Savings Plan in DC (816 participants). Same-state nearby plans are listed separately above.

Similar participant headcount

Nearest other-state filings by covered participants (816 participants); asset peers above are excluded.

DOL Form 5500 plan year 2023. Asset totals can differ widely at the same headcount; neither axis is a quality rating.

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).
Which 401(k) plans cover a similar participant headcount to Old Second Bancorp, Inc. Employees' 401(k) Savings Plan & Trust? ▼
Among 401(k) plans in other states, the closest by covered participants is Public Company Accounting Oversight Board Investment & Savings Plan in DC (816 participants, $487M in assets).

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.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from U.S. Department of Labor Form 5500 filings (EBSA). See our methodology for details.