TripAdvisor Inc. /zigman2/quotes/206118480/composite TRIP +0.92% shares fell roughly 4% in the extended session Wednesday after the company announced a joint venture with Trip.com Group Ltd. /zigman2/quotes/210510831/composite TCOM +2.64% and a special dividend of $3.50. The online travel company also reported third-quarter net income of $50 million, which amounts to 36 cents a share, versus profits of $69 million, or 49 cents a share in the year-ago quarter. Adjusted for stock-based compensation, among other things, earnings were 58 cents a share. Revenue fell to $428 million from $458 million a year ago. Analysts surveyed by FactSet had estimated adjusted earnings of 69 cents a share on sales of $459 million. TripAdvisor said that it announced a special cash dividend of $3.50 a share, or roughly $490 million in total, and an increase of its stock repurchase amount by $100 million for a total of $250 million. TripAdvisor also said Wednesday that it was entering into a partnership with Trip.com Group subsidiary Ctrip Investment Holding Ltd., that includes a joint venture and Trip.com taking a board seat. Trip.com will also acquire $317.6 million worth of TripAdvisor stock after the deal is approved by regulators. TripAdvisor also said it plans to evaluate its cost structure. TripAdvisor stock has fallen 24% this year, as the S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.24% gained 23%.