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Private company

Extrema Ratio

Extrema Ratio is an Italian knife company. It was founded in 1997 by Maurizio Castrati and Mauro Chiostri in Prato.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

1997Founded1

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Coltello Extrema Ratio NIMBUS Ordinanza
Photo: FDM94, CC BY 4.0, via Wikimedia Commons3

Extrema Ratio is an Italian knife company. It was founded in 1997 by Maurizio Castrati and Mauro Chiostri in Prato.2

Products and brands

  • knife

Listed on Wikidata.1

Timeline

  1. 1997Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

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