Conversation so far:
What allegation was made against Mark Cuban?
The SEC accused Mark Cuban of alleged insider trading.
What was the outcome of the SEC's accusation against Mark Cuban?
The charges were dismissed.
Other than the SEC who else made the insider trading allegation against Mark Cuban?
Did Mark Cuban have to pay any fines related to the allegations against him?
The charges were dismissed.

Question: When did the SEC first make this allegation?
Self-contained rewrite: When did the SEC first make the allegation of insider trading against Mark Cuban?