Company · FBIZ · CIK 1521951

First Business Financial Services, Inc. (FBIZ) SEC filings and CIK.

FBIZ’s SEC Central Index Key (CIK) is 0001521951, or 1521951 without leading zeros. The SEC’s ticker file lists it as FIRST BUSINESS FINANCIAL SERVICES, INC..

Ticker: FBIZ
CIK: 0001521951
Other tickers: None
Insider transactions, Q3 2026: 2

Insider trading

In Q3 2026, insiders at First Business Financial Services, Inc. reported 2 non-derivative transactions on 2 Forms 3, 4 and 5, including 0 open-market purchases and 1 sales.

Recent filings we observed

No filings for this CIK appear in our current observation window. The full history is available from the filings endpoint below and on SEC.gov.

Get FBIZ SEC data through the API

Filing history

curl "https://sec-api.dev/api/v1/filings?cik=1521951&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Company profile

curl "https://sec-api.dev/api/v1/companies/1521951" \
  -H "Authorization: Bearer $SEC_API_KEY"

Reported XBRL facts

curl "https://sec-api.dev/api/v1/facts/1521951?taxonomy=us-gaap&concept=Revenues&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Ticker to CIK API · SEC filings API · First Business Financial Services, Inc. on SEC.gov

Questions

What is FBIZ’s CIK number?

FBIZ’s SEC Central Index Key (CIK) is 0001521951, or 1521951 without leading zeros. The SEC’s ticker file lists it as FIRST BUSINESS FINANCIAL SERVICES, INC..

How do I find First Business Financial Services, Inc.’s 10-K?

Request /api/v1/filings?cik=1521951&form=10-K, or open the company’s EDGAR page and filter by 10-K. Foreign issuers file 20-F or 40-F instead.

Ticker and CIK: SEC company_tickers.json, cached 2026-11-02. Tickers can move between entities; the CIK identifies the filer.

Plain-text version for agents and LLMs: /companies/fbiz.md

Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.