Moving day indeed, as Parry climbed from a tie for 16th into a tie for the lead at 12-under-par 204. He was joined there by Roland Thatcher (66) and 1998 winner Bob Burns (67).
David Sanchez fired a 5-under 67 to move into a tie for fourth place at 11-under-par 205. He stands alongside Nick Flanagan (69), Michael Letzig (69), Chris Baryla (68) and David Sanchez (67) one stroke behind the leaders.
Parry, a tour rookie looking for his first win, opened with back-to-back birdies to get to minus-7. He again made two straight birdies from the fifth, but gave one of those shots back with a bogey at the par-4 seventh.
The 35-year-old birdied 10 and 12 to move into a share of the lead at 10 under. Parry chipped in for birdie at the 14th to move one stroke ahead of Thatcher and Letzig.
Parry parred his next three holes, then two-putted for birdie at the par-5 18th at The Dominion Club to finish at 12 under.
'I did notice how good the scores were Friday and how much softer the greens got overnight,' Parry said. 'I was very specific and tried to play aggressive to hit my balls closer to the holes.'
Parry's play is an aberration compared to what he has done so far this season. He has made the cut in just one of his first seven events, a tie for 30th at the Livermore Valley Wine Championship.
'I want that top-25 (on the money list) like everybody else,' said Parry. 'I am not too worried about the start because I haven't seen any of the courses out here.'
Thatcher was hot early. He eagled the par-5 second, then birdied the next two holes to quickly move to 10 under.
He cruised to nine straight pars from the fifth. Thatcher birdied the 14th to grab a piece of the lead at 11 under. After driving into the rough at 18, he played short of the green, then knocked his third to 3 feet. Thatcher tapped that in for birdie and a share of the lead.
Burns was the final of the three leaders to get into the clubhouse. He made the turn at 7 under after three birdies and a bogey over his opening nine holes.
The 39-year-old Burns, who owns one PGA TOUR win and two Nationwide titles, erased his bogey on nine with a birdie at the 10th. He dropped another stroke on 13, but came back with birdies on 14 and 15. Burns birdied the last like his fellow leader to end at minus-12.
'I hit a lot of fairways and greens. I think 12 under is a little lower than it was when I won here nine years ago. I think it was 14 under final, but I think it will be a little lower this year,' stated Burns. 'I have to keep hitting greens and fairways and making putts.'
Second-round leader Henrik Bjornstad managed just a 1-under 71 Saturday and slid into a share of eighth at 10-under-par 206. He was joined there by Brad Elder. Greg Chalmers and Omar Uresti are one stroke further back at minus-9.