ResMed is a big manufacturer of CPAP machines as well as ventilators, and is the only US-based company listed in this Reuters article about ramping up ventilator production [0]. It says, "ResMed has reallocated resources away from producing other devices to meet demand that is more than four times normal levels". So it's possible they are making fewer CPAP machines and more ventilators.

[0] https://www.reuters.com/article/us-health-coronavirus-ventil...