Some small publishers, please take with a grain of salt until they can be verified, especially the ones with ? next to them. List provided by soothsayr, with some input from me.
NATION-WIDE
Lucky Star 04, 05, 07, 11, 12, 14, 15
Do-Do 01
Mazie 01, 02, 03, 05, 06, 07, 08, 09, 10, 11, 12, 13
Captain Atom 01, 04
MAGAZINE PUBLISHERS/NATION-WIDE PUBLISHING
Stevie 01, 02, 03, 04, 05, 06 (dcm has 1, 3)
Mortie 01, 02, 03 (dcm has 2)
Flat-Top 01, 02, 03
Marie 8-13 (see nation-wide)
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also added some to the list of no books on the first page