Zip Co (ASX:Z1P) is making double-digit gains for a second day.

Z1P shares were up 12.1 per cent this morning to $14.18, and earlier hit an all-time intraday high of $14.53.

The buy now, pay later stock is up 167.1 per cent so far this year.

Z1P been up every day since February 10 when Citi research suggested it was undervalued compared to Afterpay (ASX:APT).

Meanwhile Fatfish (ASX:FFG) was up 103.3 per cent in morning trade to 18.7c, after rising 73.6 per cent yesterday. Its shares traded for around 3c from December through February 10.

A company Fatfish has invested in, Smartfunding Pte, is rolling out a business-to-business BNPL platform in Singapore this week.

IOUpay (ASX:IOU), which is entering the BNPL sector in Malaysia, was flat at 7c after rising 59.1 per cent on Monday.

The rest of the BNPL sector was having a subdued morning, except for Openpay (ASX:OPY) which was up 10.2 per cent to $2.93.

Zip, Fatfish, IOUpay, Openpay shares

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