Since 2015-16, Justin Thomas and Dustin Johnson are tied for the most tournament wins, with 15 tournament wins.

most wins pga tour since 2015-2016
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ThomasJohnsonMcIlroyDeChambeauRahmCantlaySpiethMatsuyamaKoepkaMorikawaSchauffeleReedLeishmanDaySmithSchefflerBurnsHomaHorschelNaKisnerBerger151598777775555554444444
NAMEEVENTSWINSTOP 10ROUNDSMONEY
Justin ThomasJustin Thomas1521562546$48,058,435
Dustin JohnsonDustin Johnson1251559456$44,312,652
Rory McIlroyRory McIlroy114954412$34,207,084
Bryson DeChambeauBryson DeChambeau123834417$25,678,435
Jon RahmJon Rahm113757403$32,680,764
Patrick CantlayPatrick Cantlay105737369$26,803,284
Jordan SpiethJordan Spieth146745522$31,602,070
Hideki MatsuyamaHideki Matsuyama152739540$32,043,548
Brooks KoepkaBrooks Koepka130741441$33,317,859
Collin MorikawaCollin Morikawa66524235$17,699,984
Xander SchauffeleXander Schauffele130535458$26,246,171
Patrick ReedPatrick Reed170543608$27,079,748
Marc LeishmanMarc Leishman155532530$22,945,571
Jason DayJason Day133536432$22,925,751
Cameron SmithCameron Smith153529496$23,142,044
Scottie SchefflerScottie Scheffler70423245$18,678,189
Sam BurnsSam Burns88420279$13,572,323
Max HomaMax Homa108415328$11,860,808
Billy HorschelBilly Horschel162436542$22,064,422
Kevin NaKevin Na156431518$18,581,164
Kevin KisnerKevin Kisner169435559$22,996,686
Daniel BergerDaniel Berger146432510$20,509,566
Bubba WatsonBubba Watson135426435$16,117,086
Viktor HovlandViktor Hovland59314208$11,024,946
Cameron ChampCameron Champ8639264$6,878,716
StatMuse has season-level data for tournament wins going back to the 1979-80 season.