** Shares of data storage company Western Digital WDC.O rise 4.7% to $282.20 premarket
** Company authorizes additional $4 billion of share repurchases
** It has ~$484 mln remaining for buybacks as of Monday under prior authorization of $2 bln in May 2025
** In January, WDC forecast Q3 adjusted revenue of $3.2 bln, plus or minus $100 million, vs analysts' estimate of $2.96 bln - data compiled by LSEG
** Shares more than tripled in 2025
(Reporting by Anhata Rooprai in Bengaluru)
((Anhata.Rooprai@thomsonreuters.com))