For Snap? A fine and a binding agreement not to do this again or else to designate TC as one of their preferred methods of disclosing financial information (like Elon's twitter is for Tesla).
Shareholders on the wrong sides of trades today can also sue Snap and have a good chance of recovering any putative losses. This is actually the bigger concern for Snap since this is likely a much bigger amount than any potential SEC fine.
On the bright side, the SEC will eventually ask how this happened. Not that they do any serious enforcement these days.
The problem is that someone at Snap did not do what they were supposed to do. Rather than a broad disclosure, they made a limited one, which had a noticeable affect on the market.
And this is exactly the type of failure that the SEC likes to police. It's like to result in a small fine and/or binding agreement for Snap to broadly disseminate financial results in the future, rather than leaking financials to favored journalists.
Do a little research into “embargo” in regards to news media and you’ll understand it’s a very very common thing.
The damage to TC is reputational, if that. This isn't the first embargo TC has broken and it won't be the last. If anything, they've developed a reputation as the place to send leaks to.
This is probably part of the reason embargo leaks aren’t that unusual.