Harry Styles

Harry Styles of One Direction performs on stage during the "40 Principales" awards 2013 ceremony at the Barclaycard Center (Palacio de los Deportes) on December 12, 2014 in Madrid, Spain.

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With Zayn Malik exploring a solo career while his former One Direction bandmates soldier on, the future is uncertain for the world's biggest boy band for the first time.

One thing they don't have to worry about just yet? Sales. News of Malik's departure actually gave all four of 1D's albums a significant bump for the period ending March 29, 2015.

How Do 1D's First Week Sales Compare to Other Boy Bands?

Their latest album, Four, experienced a 51 percent increase in album sales last week, according to Nielsen music. The album jumped 41-33 on the Billboard 200. While Four climbed up the Billboard 200, the band's other three albums -- Midnight Memories, Take Me Home and Up All Night -- re-entered the chart at Nos. 110, 187 and 192, respectively. 

As for pure album sales, Midnight Memories saw a 72 percent boost, Take Me Home enjoyed a 95 percent increase, and their first release was treated to a 113 percent jump.

The post-Zayn sales boost is a definite contrast to the previous period (ending March 22, 2015), which saw sales for 1D's albums either decrease or increase less than 5 percent, per Nielsen Music. 

Zayn Malik Shares First Solo Song With Naughty Boy

The band's current single, "Night Changes," also enjoyed a boost, moving 21 percent more downloads as compared to the previous period, per Nielsen Music.

While a number of the new 1D buyers are presumably people curious about the group in the wake of Zayn's departure, it's entirely possible a few loyal Directioners simply re-bought an album or single to support their beleaguered boys. If there's one thing you can say about One Direction fans, it's that they're loyal. 

That being said, 1D's last album, Four, saw their first-week sales tally fail to increase for the first time in their career when it landed last year. While the debut week sales for their first three albums grew larger with each release, Four opened with 387,000, a notable drop from Midnight Memories' 546,000.