My former employer (>150k employees) had MasterCard limits that were $3k per purchase and $15k per month per card. Those were hard limits. Anything over that

My former employer (>150k employees) had MasterCard limits that were $3k per purchase and $15k per month per card. Those were hard limits. Anything over that had to go through POs. Amex was only to be used for travel, couldn't use them for purchasing products. Current employer (<50 employees) has us use our personal cards and get reimbursed. Anything over a few hundred is going on a PO.