The experienced squad led from start to finish at the Millstreet event in Ireland; Australia and China secure Olympic eventing qualification.
Price guides debutant Coup De Coeur Dudevin to the win; Canadians Jessica Phoenix and Kyle Carter finish top 10 in the CCI3*-L.
Power couple Tim and Jonelle Price of New Zealand have clinched the top two spots on the FEI Eventing World Athlete Rankings.
Canada's Mike Winter finishes 25th in the 5* with El Mundo; Kelly Houtappels-Bruder competes in CAIO4* with Flip.
"I was just hoping to finish in the top five today" said the US rider after jumping from 3rd to 1st with a clear stadium jumping round.
Top Canadian is Jessica Phoenix with Bogue Sound in 18th place; event wraps up with stadium jumping on Sunday.
Jung and Chipmunk nudge Townend out of first place; Great Britain remains in the lead and Germany sits second ahead of New Zealand.
Laura Collett and London 52 remain in the pole position in the CCI5*-L following cross-country with fellow Brit Piggy March a close second.
Equestrian Sports New Zealand high performance eventing manager Graeme Thom is buoyed to see new combinations stepping up into the new 2020 squads.
Olympic athlete Tim Price, of New Zealand, has topped the FEI Eventing World Rankings for the first time, overtaking Ros Canter of Great Britain.
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