I have as much thread as I do fabric
1. Aurifil
2. Superior
3 Isacard
4. Robison-Anton
5. Wonderfil
6. Glide
7. Star
8. C&C
9. Connecting Threads - Essential and Pro
10.YLI - silk
11. Sulky
12. DMC
13. Guttermann
14. Mettler
15. One basket of misc brands.
All bought on clearance and going out of business sales. I use them all with no loyalty to any of then.