Small businesses can shop off-exchange through a broker, buy a small-group plan...

https://foxtrot-wiki.win/index.php/Can_I_Offer_Health_Benefits_to_Only_Some_Employees%3F

Small businesses can shop off-exchange through a broker, buy a small-group plan directly from a carrier, or consider an HRA. Before comparing premiums, check that employees’ doctors and preferred hospitals are in network.