I'm sure there is special handling for large sums... but six figures isn't it. Businesses routinely write checks for half a million dollars, two million dollars... it's perfectly normal to see such amounts within the banking world. There might be some extra scrutiny on the back end that you don't see, but since it's well within the realm of normal operations that the bank sees happen every day, it's nothing special.

Now, eight or nine figures, that's probably going to pass the threshold for special attention. As in, you might be required to go to the bank in person with photo ID in order to authorize the transaction, that sort of thing. But under 10 million U.S. dollars? Many businesses will handle those amounts monthly, and the bank is used to seeing them.