The prediction-market platform said it is reviewing a series of trades that appeared to anticipate the announcement before it became public.
The inquiry focuses on whether traders used confidential information or otherwise violated Kalshi’s market rules.
Zacharia’s selection has drawn attention because prediction markets allow participants to wager on political and public-policy outcomes, making unusual activity potentially significant.
Kalshi has not publicly identified the traders involved or disclosed the size of the positions under review.
The investigation could lead to canceled trades, account restrictions or other enforcement measures if the platform finds evidence of misconduct.
The episode also underscores the growing scrutiny facing prediction markets as they expand into political events and attract traders seeking to profit from rapidly developing news.