Adele Tops Billboard Artist 100; Shawn Mendes & 5 Seconds of Summer Surge

GHNASSIA/SIPA/REX Shutterstock
Adele performing at the 2015 NRJ Music Awards in Cannes, France on Nov. 7, 2015.

Adele ties for the chart's second-longest reign, while Mendes & 5SOS soar, the latter spurred by a racy Rolling Stone photo.

Fueled by the continued success of album 25 and its lead single "Hello," Adele is again the top musical act in the U.S., keeping at No. 1 on the Billboard Artist 100 chart (dated Jan. 16).

The Artist 100 measures artist activity across Billboard's most influential charts, including the Billboard Hot 100 songs chart, Top Album Sales and the Social 50. The Artist 100 blends data measuring album and track sales, radio airplay, streaming and social media fan interaction to provide a weekly multi-dimensional ranking of artist popularity.

Adele leads the Artist 100 for an eighth total (and sixth consecutive) week, tying The Weeknd for the second-longest reign since the chart premiered in July 2014. They trail Taylor Swift, the leader with 31 weeks at the summit.

Here's a look at the acts to lead the Artist 100 the longest:
31 weeks, Taylor Swift
8 weeks, Adele
8 weeks, The Weeknd
6 weeks, Drake
3 weeks, Sam Smith

Adele's '25' Rules as Nielsen Music's Top Album of 2015 in U.S.

As previously reported, 25 tallies a sixth week at No. 1 on the Billboard 200 and Top Album Sales, earning 363,000 equivalent album units in the U.S. in the week ending Dec. 31 (down 70 percent), according to Nielsen Music; of that total, 307,000 were pure album sales (down 74 percent). 25 sold 7.44 million copies in the U.S. through the week ending Dec. 31 and finishes 2015 as the top-selling album of the year.

Plus, Adele's "Hello" earns the rare honor of topping the Hot 100 for a 10th week. As in the previous week, album sales continue to mark Adele's greatest metric on the Artist 100 (63 percent). Digital song sales follow at 16 percent, with "Hello" up by 88 percent to 327,000 downloads sold in the tracking week (most songs gained heavily in the tracking week, presumably aided by the redemption of iTunes gift cards received as holiday presents).

Below Adele on the Artist 100, Justin Bieber holds at No. 2; Drake (4-3) and The Weeknd (3-4) swap spots; Swift bumps 6-5; and Twenty One Pilots return to the top 10 (11-6) for the first time since they peaked at No. 2 in June, when their album Blurryface bowed atop the Billboard 200 and Top Album Sales, as "Stressed Out" likewise hits the Hot 100's top 10.

5 Seconds of Summer Billboard Cover Shoot

Shawn Mendes also returns to the Artist 100's top 10 (14-10), powered by the success of his Hot 100 top 10 "Stitches" and follow-up "I Know What You Did Last Summer," the latter with Fifth Harmony's Camila Cabello. Mendes bounds by 52 percent in overall activity, led by a 193 increase in digital song sales. "Stitches" gains by 171 percent to 140,000 sold, while "Summer" likewise sizzles (92,000, up 133 percent). On the Hot 100, "Stitches" rebounds 8-6, after reaching No. 4, and "Summer hits a new high (33-28).

Meanwhile, 5 Seconds of Summer re-enter the Artist 100 at No. 48 (up 94 percent). The band rockets to a 650 percent rise in download sales, including a 184 percent burst (to 6,000) for current single "Hey Everybody!" 5SOS also sports a 57 percent gain in social activity, and jumps 18-13 on the Social 50, following its revealing new Rolling Stone cover story (and similarly revealing photo).

Check out the entire Artist 100 here.