I'll contribute with a few other cues that come from the likes of De Wolfe and Bruton.
Cinema City & Films Co. (of Aces Go Places fame) & Jia's Motion Picture Co. both use "Fanfare Showcase no. 6", written by the late Jack Trombey (1927-2017) with Peter Reno, from DWLP 3245, Fanfare Showcase.
Goodyear Film Company used "Fanfare Showcase no. 2".
Hwang Jang Lee used "Fanfare Showcase no. 4"
Picture One Films Ltd. and Mountview Films used "Fanfare Showcase no. 9"
Art Centre Productions used the last bit from "Fanfare Showcase no. 10"
Fai Tan Film Company used "Fanfare Showcase no. 13"
Graffon Film Company used "Fanfare Showcase no. 23"
Bojon Films Company Ltd. used "Fanfare Showcase no. 25" before switching to a synthesized branding.
H.K. Fong Ming at one point used "Fanfare Showcase no. 4", but another version exists with "Fanfare Showcase no. 29".
Golden Princess Amusement used "Revolt Link no. 9", which was likely taken from DWLP 3191 "Military Matters", all the tracks of which were written by Jack Trombey.
Warriors Film Company, Lau Brothers, and China Films (H.K.) all used "Hot Spot", from the same album. It was also used as background music in the 1979 Shaw film The Daredevils.
Sharp Films (H.K.), Filmway Productions, and a few others used "Suppression Link".
Huge Yield Film Productions actually used a Boosey & Hawkes cue from SBH 3078.
Dak Lee Film Company and Hong Kong South Sea used the opening flourishes from "Olympic Spirit" by Paul Kuhemstedt from Impress IA 379, recorded in 1966.
Prince Motion Picture Co. used a combination of the late Johnny Pearson's (1925-2011) aforementioned "Contact" and Neil Richardson's (1930-2010) "Fanfare 1".
"Fanfare 1" was also used by Lo Wei's film company in its final days, not to mention several other studios like Nan Chiang Motion Picture Co.
Thana Entertainment from Thailand used an old Major Records/Valentino cue from the 60's, probably written by Mark Winter. I can't remember the particular catalog number, though.
Sahamongkol Film's iconic fanfare between 1987 to around 1995 was David Snell's "Proclamation" from the first volume of Bruton Music's Fanfares, Links, and Bridges from 1978. They somehow redid the fanfare using keyboards for their second logo.