Spotify CEO Daniel Ek has realized laying off 1,500 people at one go may have created a 'significant challenge' for Spotify's day-to-day operations

• Daniel Ek said Spotify underestimated the impact of laying off 1,500 people in December.
• "It took us some time to find our footing," Ek told investors in an earnings call.
• The streaming giant had cut 2,300 jobs over three rounds of layoffs last year. 

Laying off 1,500 people in December ended up creating a "significant challenge" for Spotify, the company's CEO Daniel Ek said on Tuesday.