Being careless in how you handle your corporate data will be evidence against your trade secret claims. You don't just get to claim anything as a trade secret, you need to actively go about trying to keep it a secret. Going with vendors who you know or had reason to believe were going to mishandle your "trade secrets" likely makes them no longer trade secrets.

Coca-Cola can't go dropping leaflets around with the recipe for Coca-Cola Classic and then claim the recipe is a trade secret.

IANAL. Talk to your own lawyer before you mishandle your data.