The story
Sygma was founded in 1973 by Hubert Henrotte (co-founder of the Gamma agency) and other photographers from Gamma including Eliane Laffont and Jean-Pierre Laffont.
It was one of the largest and leading photo agencies, with offices in Paris, London and New York City, and about 500 photographers under contract.
It was acquired by Bill Gates' Corbis in 1999 and the new organisation was called Corbis Sygma.
Sygma declared bankruptcy and shut down operations in 2011 when it could not afford to pay damages resulting from a court case.
From Wikipedia’s article on Sygma (agency), shared under CC BY-SA 4.0.3