He rules on the strength of three charted entries.
Marshmello and Bastille's "Happier," which Mac co-wrote with Bastille's Dan Smith and Marshmello, leads the quartet of titles, as it logs its record-extending 50th week at No. 1.
The Chainsmoker and Bebe Rexha's "Call You Mine" follows at No. 2, holding at its peak for a ninth week. Mac co-wrote the songs with Drew Taggart, Alex Pall, Ali Tamposi, Andrew Watt, Tony Ann and Norman Whitfield. Next up, Marshmello's "Here With Me," featuring CHVRCHES, follows at No. 6, after peaking at No. 2 (Mac co-wrote the track with Marshmello and CHVRCHES' Lauren Mayberry, Iain Cook and Martin Doherty).