Flutter Entertainment's fourth-quarter results disappointed investors as FanDuel posted slower customer and betting growth than expected. The sports betting giant attributed the miss to improved competitor products that eroded its market share. Revenue growth decelerated sharply compared to previous quarters, raising concerns about Flutter's competitive position in the crowded US sports betting market.

Wall Street analysts had projected stronger performance from Flutter's US operations, particularly from FanDuel which dominates the market. The company's earnings report revealed that customer acquisition costs rose while average revenue per user declined. This combination suggests Flutter is spending more to retain existing customers and attract new ones in an increasingly competitive environment where rivals have enhanced their offerings.

The results highlight intensifying competition in the US sports betting sector. As competitors improve their products and expand into new states, Flutter faces pressure to maintain its market leadership. The slowdown in growth could force the company to reassess its expansion strategy and marketing investments to preserve profitability in a maturing market.