** Shares of online travel agency Travelzoo TZOO.O fall 11.64% to $5.01
** TZOO posts Q4 revenue of $22.47 million, slightly below LSEG-compiled analysts' average estimate of $22.54 million
** Reports Q4 operating income of $554,000, below analysts' average estimate of $1.59 million
** Co's investments in acquiring more Club Members impact EPS
** All four analysts tracking the stock rate it "strong buy" or "buy"; their median PT is $22 - data compiled by LSEG
** As of last close, TZOO down 72.7% in the last 12 months
(Reporting by Pragyan Kalita in Bengaluru)
((Pragyan.Kalita@thomsonreuters.com;))