Making this a separate post, as I think it deserves its own post.
OldCompany is opening enrollment for all cards.
They accept: American Express, Barclays, Capital One, Chase, Citibank, Discover, Elan/Fidelity, Huntington Bank, NFCU, PNC, Synch Bank (Care Credit), TD Bank, and US Bank cards.
Amex is newly accepted as of right now.
They only open enrollment about once per year, for a few weeks. The last time was 1 year ago, August 2020. The last time before that was April 2019. If you have cards you want to sell tradelines on, now is the time.
As has been documented in this thread, OldCompany seems to be the best Tradeline company in the business. Tons of sales, automated payments, super good customer support, and great business practices (like the recent payout with Barclays nonpostings that they straight lost money on and didn't just pass that onto cardholders).
Personally, I'd be switching any cards you have for tradelining to OldCompany, if you aren't already there. IMO, anyone with cards for tradelining should be enrolled with them. And since they only open up signups for cardholders once a year or so, in the last few years, it's worth jumping on and getting your cards enrolled when they do.
Feel free to PM me if you need a referral. :)