I'd be happy to help you with your search for a shared group tour to Srinagar-Leh-Manali. Some tour operators that offer such trips include:
IndiaHikes: A reputable trekking and adventure travel company that offers a wide range of tours, including the Srinagar-Leh-Manali trip. The cost for the tour varies depending on the season and the package you choose.
Explore Himalaya: A travel company that specializes in adventure travel and offers a variety of group tours, including the Srinagar-Leh-Manali trip. The cost for the tour varies depending on the season and the package you choose.
Explore Ladakh: A travel company that specializes in tours to Ladakh and offers a variety of group tours, including the Srinagar-Leh-Manali trip. The cost for the tour varies depending on the season and the package you choose.
Snow Leopard Adventures: A travel company that specializes in adventure and cultural travel and offers a variety of group tours, including the Srinagar-Leh-Manali trip. The cost for the tour varies depending on the season and the package you choose.
Thrillophilia: A travel company that specializes in adventure, culture and wildlife tour and offers a variety of group tours, including the Srinagar-Leh-Manali trip.