Archie Comics
1939 - Still Going
Archie Comics has been going a very long time and after the success of there Sonic Mini-series (based on the Up coming 'Sonic the Hedgehog' Cartoon) they kept on going strong.
Fleetway
1878- Still Going
An inprint of Egmont Books, Fleetway published a long running Sonic Comic in England which featured a number of writers and artists that have gone on to or had fame at the time in there fields.
Shogaku Yonensei [Fourth Grade Comics]
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Popular Young kids Magazine Shogaku Yonensei, ran a Sonic the Hedgehog Series starting in 1992 about a young Hedgehog Nicky Parlouzer, that could become the Super hero "Sonic the Hedgehog".
Semic Press AB
1963?-1999
Semic Press AB were the Sweden Translators and publishers of Archie Comics 'Sonic the Hedgehog' line.
Bastei
1953 -Still Going
Bastei is a german Company that did a version of Fleetways Sonic the Comic in germany, translated and with some new features in handy, but not very good, pocket book size.
Tournon Egmont
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Tournon Egmont is a branch of Egmont (possibly bought out by them) which printed the French version of STC.
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An at present unknown company (probebly part of Egmont) Printed a Dutch version of STC.
Rizzoli Egmont
1993
Rizzoli Egmont was the italian company that printed their version of STC
Semic AS
1993
Much like the swedish version of Semic, this was a translation of the archie comics, this one from Norway
Misc

Different comic and short stories by different companies.