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Siz Gmbh Bonn

SIZ offers IT solutions, individual consulting and support, and outsourcing in compliance functions.

Information Technology and Services
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Headquarters
Bonn, Nordrhein-Westfalen, GermanySource: RevenueBaseRetrieved October 13, 2026
Employee range
201 to 500Source: RevenueBaseRetrieved October 13, 2026
Founded
1990Source: RevenueBaseRetrieved October 13, 2026
Published list appearances
1 supported appearance ↗Source: RevenueBase lists
The company at a glance

What does Siz Gmbh Bonn do?

As a Sparkassen-Finanzgruppe company, SIZ works on IT and security standards and compliance functions in the German financial sector and beyond.

Based on the company’s public LinkedIn information, supplied through RevenueBase.

Who it serves

SIZ Service GmbH consolidates the Sparkassen-Finanzgruppe’s demand for fixed-line and mobile communications.

What the business offers

Services & capabilities.

Telecommunications tariffs

SIZ Service provides tailored tariffs in partnership with T-Systems and Telekom Deutschland.

Source: LinkedIn company description · Retrieved October 13, 2026

Explore the business in context

Company lists.

Supported appearances on published RevenueBase lists, including available memberships beyond displayed rankings.

Positions describe ordering within each source list. See how lists are built ↗

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Embeddable award for your website

BADGE PREVIEWSiz Gmbh Bonn listed #15 on Financial services IT companies, September 20, 2026Open the published source list.
Siz Gmbh Bonn

#15 Financial services IT companies

Snapshot: September 20, 2026

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Company information

Sources & data notes.

RevenueBase prepared this profile from the company’s public LinkedIn information and RevenueBase company data. These source records were retrieved on October 13, 2026. AI helped summarize these sources, with a separate automated check against the source text completed on November 4, 2026. Directory positions use company-contact counts from separate saved list snapshots dated September 20, 2026. How the company lists are built.

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