First Business Financial Services, Inc.
US ˙ NasdaqGS ˙ US3193901002

SecurityFBIZ / First Business Financial Services, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership1,142 shares
Latest Disclosed Value $ 61,588
Citigroup Inc reports 69.19% decrease in ownership of FBIZ / First Business Financial Services, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 1,142 shares of First Business Financial Services, Inc. (US:FBIZ) valued at $61,588 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,706 shares of First Business Financial Services, Inc.. This represents a change in shares of -69.19% during the quarter. The current value of the position is $63,712 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F FIRST BUSINESS FINL SVCS COM 319390100 1,142 -2,564 -69.19 62 -69.65 0.0000
2026-02-13 2025-12-31 13F FIRST BUSINESS FINL SVCS COM 319390100 3,706 -751 -16.85 201 -11.84 0.0001
2025-11-10 2025-09-30 13F FIRST BUSINESS FINL SVCS COM 319390100 4,457 450 11.23 228 12.87 0.0001
2025-08-11 2025-06-30 13F FIRST BUSINESS FINL SVCS COM 319390100 4,007 -2,862 -41.67 203 -37.46 0.0001
2025-05-12 2025-03-31 13F FIRST BUSINESS FINL SVCS COM 319390100 6,869 -526 -7.11 324 -5.56 0.0002
2025-02-12 2024-12-31 13F FIRST BUSINESS FINL SVCS COM 319390100 7,395 528 7.69 342 9.27 0.0002
2024-11-12 2024-09-30 13F FIRST BUSINESS FINL SVCS COM 319390100 6,867 4,418 180.40 313 247.78 0.0002
2024-08-12 2024-06-30 13F FIRST BUSINESS FINL SVCS COM 319390100 2,449 564 29.92 91 28.57 0.0001
2024-05-10 2024-03-31 13F FIRST BUSINESS FINL SVCS COM 319390100 1,885 328 21.07 71 12.90 0.0000
2024-02-09 2023-12-31 13F FIRST BUSINESS FINL SVCS COM 319390100 1,557 1,205 342.33 62 520.00 0.0000
2023-12-06 2023-09-30 13F/A-1 FIRST BUSINESS FINL SVCS COM 319390100 352 -2,276 -86.61 11 -87.01 0.0000
2023-11-09 2023-09-30 13F FIRST BUSINESS FINL SVCS COM 319390100 352 -2,276 11 0.0000
2023-08-10 2023-06-30 13F FIRST BUSINESS FINL SVCS COM 319390100 2,628 2,585 6,011.63 78 7,600.00 0.0001
2023-05-11 2023-03-31 13F FIRST BUSINESS FINL SVCS COM 319390100 43 -19 -30.65 1 -50.00 0.0000
2023-02-09 2022-12-31 13F FIRST BUSINESS FINL SVCS COM 319390100 62 -61 -49.59 2 -50.00 0.0000
2022-11-10 2022-09-30 13F FIRST BUSINESS FINL SVCS COM 319390100 123 -380 -75.55 4 -75.00 0.0000
2022-08-10 2022-06-30 13F FIRST BUSINESS FINL SVCS COM 319390100 503 -3,960 -88.73 16 -89.04 0.0000
2022-05-12 2022-03-31 13F FIRST BUSINESS FINL SVCS COM 319390100 4,463 4,463 146 0.0001
2021-11-10 2021-09-30 13F FIRST BUSINESS FINL SVCS COM 319390100 0 -2 -100.00 0 0.0000
2021-08-10 2021-06-30 13F FIRST BUSINESS FINL SVCS COM 319390100 2 -538 -99.63 0 -100.00
2021-05-13 2021-03-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 540 -1,017 -65.32 13 -55.17 0.0000
2021-02-11 2020-12-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 1,557 1,165 297.19 29 383.33 0.0000
2020-11-12 2020-09-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 392 -691 -63.80 6 -66.67 0.0000
2020-08-12 2020-06-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 1,083 -1,657 -60.47 18 -57.14 0.0000
2020-05-12 2020-03-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,740 1,010 58.38 42 -8.70 0.0000
2020-02-12 2019-12-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 1,730 587 51.36 46 64.29 0.0000
2019-11-08 2019-09-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 1,143 -993 -46.49 28 -45.10 0.0000
2019-08-12 2019-06-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,136 88 4.30 51 24.39 0.0000
2019-05-13 2019-03-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,048 -44 -2.10 41 0.00 0.0000
2019-02-12 2018-12-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,092 -188 -8.25 41 -22.64 0.0000
2018-11-13 2018-09-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,280 112 5.17 53 -5.36 0.0000
2018-08-10 2018-06-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,168 -586 -21.28 56 -18.84 0.0001
2018-05-11 2018-03-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,754 -2,587 -48.44 69 -42.02 0.0001
2018-02-12 2017-12-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 5,341 794 17.46 119 15.53 0.0001
2017-11-13 2017-09-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 4,547 500 12.35 103 10.75 0.0001
2017-08-11 2017-06-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 4,047 -1,205 -22.94 93 -31.62 0.0001
2017-05-12 2017-03-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 5,252 -7,409 -58.52 136 -54.67 0.0001
2017-02-10 2016-12-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 12,661 10,071 388.84 300 391.80 0.0003
2016-11-10 2016-09-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 2,590 1,179 83.56 61 84.85 0.0001
2016-08-12 2016-06-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 1,411 -5,853 -80.58 33 -80.12 0.0000
2016-05-13 2016-03-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 7,264 1,895 35.30 166 23.88 0.0002
2016-02-12 2015-12-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 5,369 4,323 413.29 134 458.33 0.0001
2015-11-13 2015-09-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 1,046 -45 -4.12 24 -53.85 0.0000
2015-08-13 2015-06-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 1,091 841 336.40 52 372.73 0.0000
2015-05-14 2015-03-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 250 -460 -64.79 11 -67.65 0.0000
2015-02-17 2014-12-31 13F FIRST BUS FINL SVCS INC WIS COM 319390100 710 572 414.49 34 466.67 0.0000
2014-11-14 2014-09-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 138 105 318.18 6 200.00 0.0000
2014-08-14 2014-06-30 13F FIRST BUS FINL SVCS INC WIS COM 319390100 33 33 2 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.