Branch Network
Oak Bank Locations & Branches Fitchburg, Wisconsin
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Oak Bank operates 1 branch from its headquarters in Fitchburg, WI, .
Oak Bank branch network
Its one office is in Fitchburg, WISCONSIN. It had the same number of branches on June 30, 2025.
Oak Bank at a glance
Its CET1 capital ratio was 15.32% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $486.3M
- CET1 ratio, Q2 2026
- 15.32%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Established
- 2000
Deposit market share
Share of all FDIC-insured deposits held in each area, from the June 30, 2026 Summary of Deposits. Rank 1 is the largest holder. Shares are by bank charter, not by holding company.
| Area | Rank | Deposit share | Deposits |
|---|---|---|---|
| City: Fitchburg, WI (1 branch) | 1 of 5 | 53.3% | $419.6M |
| State: WI (1 branch) | 73 of 185 | 0.2% | $419.6M |
Ranked by total assets among banks headquartered in the state: Largest banks in Wisconsin.
Share by county and metro area
Oak Bank's share of FDIC-insured deposits in the counties and metro areas where it has branches, from the June 30, 2026 Summary of Deposits. Up to the ten largest of each are shown, by the bank's deposits. Rank 1 is the largest holder. Banks only: credit unions are not in the Summary of Deposits.
Counties
| County | Rank | Deposit share | Deposits | County total |
|---|---|---|---|---|
| Dane, WI (1 branch) | 18 of 33 | 1.6% | $419.6M | $26.10B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Madison, WI (1 branch) | 21 of 41 | 1.4% | $419.6M | $30.15B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Oak Bank (main office) | Fitchburg, WI | 53719 | $419.6M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 35333) · FFIEC NIC profile (RSSD 2857600)