DraftKings Inc. (NASDAQ: DKNG) shares fell 7.6% on Sept. 17 after data from the first week of the National Football League season was released. Needham cited that the prediction market platform, Kalshi, captured 76% of NFL Week One prediction market volume. That was in sharp contrast to DraftKings's own prediction market exchange, DKeX, which took approximately 3%.
That data helps explain why DKNG is down over 39% in 2026 and over 51% in the last 12 months.