Santa Cruz owns the factory where their frames are made. No other company's frames are made in that factory. I'd say they make their own frames, just not in their Santa Cruz location.Santa Cruz no makey carbon frame, Specialized no makey frame, Trek no makey (most) their frames, Cannondale no makey.
Yeti, Rocky Mountain, Ibis, Intense, Evil, Pivot, Felt, Transition, Ellsworth (haha) all no makey their own carbon frames.
Giant makey their own carbon frames.
Pretty much all the companies (not many) in Asia that make carbon frames have been doing it for a while.
But you still get what you pay for....