Dropbox’s surge on the stock market has continued, with the company going up another 7% on its second day on the stock market.

The company saw its shares close at $30.45, giving the company above a $13 billion market cap, fully diluted.

When it priced its IPO, there was a question as to whether Dropbox would surpass the $10 billion valuation it achieved in its last private round. It eliminated those concerns overnight.

The first few days have been a strong indicator of investor demand for the cloud storage company.

To recap, Dropbox initially hoped to price its IPO between $16 and $18, then raised it from $18 to $20. Then it ultimately priced its IPO at $21, closing the day above $28. And it still continues to go up.

Investors like Dropbox’s improving financials.

It brought in $1.1 billion in revenue in its most recent year. This is up from $845 million in revenue the year before and $604 million for 2015.

Yet while it’s been cash flow positive since 2016, it is not profitable. Dropbox lost nearly $112 million last year. But its margins are looking better when compared with losses of $210 million for 2016 and $326 million for 2015.

Although Dropbox is very different than Spotify which intends to list next week, investors will view this favorable debut as a sign that the IPO window is “open,” meaning that there is strong demand for newly public tech companies.