** Brazilian digital lender Nu Holdings' NU.N shares plunge as much as 16%; last down 14.5% at $11.41
** NU late Thursday posted Q4 revenue of $2.99 billion, below analysts' expectations of $3.29 billion, according to estimates compiled by LSEG
** Citi analysts say their read-through of the results was mostly negative, with key performance indicators on the revenue side "decelerating markedly"
** NU seems to be taking a more prudent stance towards origination, mainly on credit cards, they said
** Jefferies says NU de-risking on credit cards was still affecting revenue growth
** As of last close, NU stock up 28.8% YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))