I was going through some boxes and found a copy of an S-A design book from 2000: Sport Compact Bolt On Performance.
When I first got the book, I was disappointed - it was little more than a glorified parts catalog. Now, it's a glorified parts catalog time capsule showing what was available in 2000, and it's interesting to compare it to what's out there now. (Anyone want this book for a nostalgia build for when the original The Fast and the Furious hit theaters? It's yours for the cost of shipping.) Looking through its list of sources, it's interesting to see what big names have survived and what haev disappeared. Some, I was able to find interesting stories on. Others, well, anyone know and care to share? These are just ones from the index of the book.
American Products Company (APC): Got slapped with a massive fine for falsely advertising their knock-off Altezza taillights as street legal when they weren't. The brand was sold to Pilot Automotive, who is no longer doing anything with it and focusing on repair parts.
Iceman Intakes / Knight Engineering: Their business caught fire shortly after the book was published. Near as I can tell, they never recovered from the loss.
Jackson Racing: Oscar Jackson sold his business to Moss Motors, but now he's back under the original Jackson Racing name.
Jacobs Electronics: Bought up by Prestolite Performance. Prestolite tried to keep the name around for a while, although they completely tossed Chris Jacobs' designs and marketed their own products. Then Holley bought out the Prestolite Performance line, ending up with Mallory, MSD, Accel, and Jacobs in one brand. Having that many ignition lines didn't really make sense, and given Jacobs' reputation, I'm not surprised they didn't make the cut. (Personally, I would have cut Accel's line, too, although they didn't have as many detractors as Jacobs.)
RS Akimoto: This is one I tried to track down and couldn't find an answer... but found a lot of interesting clues. Several older Honda forum posts said things along the lines of "Yes, they're gone, and good ridance!" But exactly what brought down a name that used to be plastered across Civics everywhere remains a mystery.