Stuart Anderson only managed an even-par 70, while Joseph Lanza fired a 4-under 66 to join Jorgensen at 4-under-par 136 at the Highlands Golf Course at Horseshoe Valley Resort.
The trio on top of the leaderboard are the only three players under par through 36 holes of the season-ending event. Heavy wind and a difficult course led to the 36-hole cut falling at 6-over-par 146.
Chris Cureton (70), Wes Heffernan (71), Andy Matthews (67) and Tom Stankowski (71) are knotted in fourth place at even-par 140.
Jorgensen reach 8 under par for the championship with birdies at 12 and 13 as he opened on the back nine Friday. A double-bogey at the 16th derailed Jorgensen, but back-to-back bogeys at 17 and 18 knocked him out of the lead.
He birdied the first hole, then dropped another shot at the third. Jorgensen bogeyed the par-5 seventh, but a birdie at eight got him his piece of the lead.
'I knew getting out of bed today it was going to be a tough one,' said Jorgensen. 'I'm just trying to stay positive and be my own best friend. I'm excited. I've learned from my mistakes. Hopefully I've learned enough.'
Anderson also played on the back nine first and rattled off three birdies in his first five holes. He dropped shots at the 16th and 18th holes, then squandered many birdie looks on the second nine.
Anderson bogeyed four, but got the shot back with a birdie at seven. He had a wedge in his hand from the fairway at the ninth, but three-putted from the fringe for a bogey.
'I had a bit of a commanding lead and maybe it crept into my mind,' admitted Anderson. 'I put my name up there early, but then made some bad choices. I hit some quality shots and didn't get anything out of it.'
Lanza birdied his first two holes on Friday, including a tap-in at the par-5 second. He bogeyed the fifth, but tallied three birdies around the turn to reach 4 under par for the championship.
He bogeyed No. 14, but drained a 25-foot birdie putt at the 17th to grab his share of first.
'It was just one of those days,' said Lanza. 'Even when I missed it, I missed in the right spots. I didn't have a number like that in mind this morning, especially with that wind, but you needed to hit good golf shots. I hit a string of them.'
Lucas Bates (69), George Bradford (71), Ben Bunny (70), John Ellis (72), Anthony Rodriguez (71), Brian Unk (72), Lee Curry (75), Christo Greyling (69), Joe Horowitz (68), Dustin Risdon (68) and Brendan Steele (71) are tied for eighth place at plus-1.