Summoner is entitled to all boss loot.
When the summoner's client handles a summoned boss's loot, Sunshine Alley tries to place the rewards directly into that player's inventory, respecting space and carrying capacity; leftovers appear beside them. Otherwise the loot drops into the world. Other players do not automatically pick up marked boss loot, but they can still pick it up manually.
Trophies are distributed to every attending players.