Poseidon Expeditions
One ship, built around shore time
Running a single 114-passenger ship, the Sea Spirit, since 2015, Poseidon keeps its whole operation focused on one thing: getting guests off the ship and onto the ice, with multiple landings a day. Antarctica is its main season, with optional sea kayaking and overnight camping, alongside Svalbard and Greenland voyages.
Quark Expeditions
Widest fleet in the category
Founded the same year as Aurora (1991), Quark runs one of the most equipment-heavy polar fleets in the industry — including Ultramarine, with twin helicopters for flightseeing and remote landings. Best if you want the broadest itinerary choice and don't mind a slightly larger ship than Aurora's.
HX Expeditions
Bigger ships, all-inclusive fares
Formerly Hurtigruten Expeditions, HX operates larger hybrid-powered ships (up to roughly 500 guests) with drinks, Wi-Fi, and gratuities built into the fare. Best if lower per-night cost and onboard amenities matter more to you than small-ship intimacy.