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Spotify shares dropped 9% after its first results report as a public company disappointed investors.

The Swedish firm said losses narrowed to €41m (£36.1m; $49m) in the three months to the end of March, down from €139m a year earlier.

But while the results were largely in line with estimates, investors remain concerned Spotify is losing money.

"Investors were hoping for a little more", said Atlantic Equities analyst James Cordwell.

He pointed to slow growth in North America, which is seen as a gauge on how it is competing against Apple and Amazon.

But Spotify chief executive and co-founder Daniel Ek said that he did not see any "meaningful impact" from competition.

"When we look at this, we don't really think that this is a winner-take-all market. In fact, we think multiple services will exist in the market and we are all in a growing market," he said.

Spotify's sales hit €1.14bn (£1bn; $1.37bn) in the three months to March.

And while the music streaming pioneer's total user base reached 170 million, less than half were paid subscribers.

Morningstar analyst Ali Mogharabi suggested that part of the problem may be that it was offering "too many discounts" on music subscriptions and extending the length of free-trials as it tries to convince users to start paying, rather than the free, advertising-funded service.

Spotify was valued at about $26bn in its market debut in New York last month.

Since its listing,