** Shares in cloud platform co Fastly FSLY.O up 75%, which would be a record one-day pct gain, after Q4 rev, EPS and outlook beat expectations with co citing AI as a reason for bullish guidance

** FSLY late Weds reported Q4 rev of $172.6 mln, beating Street expectations for $161.4 mln, and its surprise adj EPS of $0.12 topped estimate of $0.06, as per LSEG

** Co forecast Q1 rev of $168-$174 mln vs Street view of $159.6 mln and adj EPS of $0.07-$0.10 vs consensus expectation for $0.01 EPS

** For 2026, EPS forecast of $0.23-$0.29 was well above analysts' model of $0.13, and guidance of $700-$720 mln in rev surpassed Street view of $667.8 mln

** Co said that as it looks toward 2026, anticipates "continued momentum, with AI as an increasing tailwind" for its business

** D.A. Davidson boosted its PT by $4 to $13, but maintained 'neutral' rating, pointing out that co's top 10 customers were the primary driver of Q4 growth

** FSLY last traded at $16.30 vs median PT of $13, per LSEG, which shows 10 analyst ratings: 1 'strong buy,' 2 'buy,' 6 'hold,' and 1 'sell'

** Including move on Thurs, stock up ~58% YTD vs 2.3% drop for Nasdaq .IXIC

(Reporting by Sinead Carew)

((sinead.carew@thomsonreuters.com))