I thought I'd count
Ilford: FP4 PanF HP5
Kodak B&W: TX320 Plus-X Tmax 100 Panatomic-X
Kodak Color: Supra 100 (running Low) UC400 &100, Porta all Flavors, all speeds, EPN EPR EPD (saving last rolls), Kodachrome 200! and last of 25.
Fuji: Neopan 100 SS, 400, 1600, Provia 100f, Astia, Superia 200 and 400, 800, Instant B&W and Instant Color (4x5 and 3x4).
Agfa: APX 100, 25, tiny bit of 400, Optima 100 (120!) Portrait 160, Optima 200.
I think that covers the stuff I use generally in a regular basis. I didn't count the odd '1 or 2' rolls of really out there films, the 'Lumiere's and EPH, EPJ, PMZ, Vericolor, Edupe, EPY (8x10 big box anybody want it?) Fuji MS 100/1000, the 'east European' B&W's, or the TMZ, TMY, Delta 400 that I used to use all the time but don't or rarely.
Oh, 35mm, cans and bulk, 120 and 4x5.
Come to think of it I don't know if I 've ever NOT shot a film at one time. Konica Pro400? Yup. Agfa Utra 50? Yup, in 120. 3M 640T pushed a stop? Yup. Kodachrome 64 in 120? Yup, and sigh, still have a few rolls in the freezer.