Rickey Ward, JBWere's New Zealand equity manager, said the drop in Xero's share price was difficult to explain.
But he has one possible theory that relates to the company's $180 million capital raising last October.
New shares issued in the capital raising are restricted from being sold until October this year.
Ward said there could be a fear among Xero shareholders that investors involved in the capital raising - who included early Facebook investor Peter Thiel - might sell stock when the restriction is lifted, which could push Xero's share price even lower.
Forsyth Barr analyst Blair Galpin had not seen anything to explain why share price was cooling off and that the volume being traded was not huge.
"It's not a large number of shares trading for that price drop," he said.
"Nothing's changed in the Xero story," he said.
- with Christopher Adams