| SC 13G/A | 2018-02-14 | BANC FUNDS CO LLC | FIRST BUSINESS FINANCIAL SERVICES, INC. | 160,200 | 1.8% | EDGAR |
| SC 13G/A | 2018-02-13 | MANULIFE FINANCIAL CORP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 491,535 | 5.6% | EDGAR |
| SC 13G/A | 2018-02-08 | WELLINGTON MANAGEMENT GROUP LLP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 518,808 | 5.9% | EDGAR |
| SC 13G/A | 2017-02-14 | BANC FUNDS CO LLC | FIRST BUSINESS FINANCIAL SERVICES, INC. | 0 | 0.0% | EDGAR |
| SC 13G | 2017-02-14 | MANULIFE FINANCIAL CORP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 471,317 | 5.4% | EDGAR |
| SC 13G/A | 2017-02-09 | WELLINGTON MANAGEMENT GROUP LLP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 528,502 | 6.1% | EDGAR |
| SC 13G | 2016-02-11 | WELLINGTON MANAGEMENT GROUP LLP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 478,550 | 5.5% | EDGAR |
| SC 13G/A | 2016-02-08 | BANC FUNDS CO LLC | FIRST BUSINESS FINANCIAL SERVICES, INC. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2015-02-12 | BANC FUNDS CO LLC | FIRST BUSINESS FINANCIAL SERVICES, INC. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2014-02-14 | WELLINGTON TRUST Co N A | FIRST BUSINESS FINANCIAL SERVICES, INC. | 171,510 | 4.4% | EDGAR |
| SC 13G/A | 2014-02-14 | WELLINGTON MANAGEMENT CO LLP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 171,510 | 4.4% | EDGAR |
| SC 13G/A | 2014-02-14 | BANC FUNDS CO LLC | FIRST BUSINESS FINANCIAL SERVICES, INC. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2014-02-12 | M3 PARTNERS LP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 189,864 | 4.8% | EDGAR |
| SC 13G | 2013-02-14 | WELLINGTON TRUST Co N A | FIRST BUSINESS FINANCIAL SERVICES, INC. | 300,000 | 7.6% | EDGAR |
| SC 13G | 2013-02-14 | WELLINGTON MANAGEMENT CO LLP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 300,000 | 7.6% | EDGAR |
| SC 13G | 2013-02-11 | BANC FUNDS CO LLC | FIRST BUSINESS FINANCIAL SERVICES, INC. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2013-02-08 | M3 PARTNERS LP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 281,352 | 7.5% | EDGAR |
| SC 13G | 2012-12-14 | M3 PARTNERS LP | FIRST BUSINESS FINANCIAL SERVICES, INC. | 273,514 | 7.3% | EDGAR |
| SC 13G/A | 2012-03-09 | Eidelman Virant Capital | FIRST BUSINESS FINANCIAL SERVICES, INC. | 162,372 | 6.2% | EDGAR |