** Respiratory device maker ResMed's RMD.N shares jump 11% to $203.55 premarket
** Stock set for an over eight-month high, if gains hold
** Posts Q3 adj EPS of $2.13, above est of $1.91; revenue of $1.19 bln slightly above est of $1.17 bln - LSEG data
** Profit beat comes on the back of strong demand for co's sleep apnea devices
** Announces quarterly cash dividend of $0.48/shr
** "ResMed delivered a strong beat as gross margins rebounded after a long period of relative weakness... We assume sales grow in line with market given its dominant share and Philips Respironics is seemingly sidelined for the foreseeable future," says J.P.Morgan
** Out of 15 brokerages tracking RMD, rate it "buy" or higher and six "hold"; median PT at $203.50
** As of last close, RMD shares up ~7% YTD vs 2.6% rise in S&P 500 healthcare sector .SPXHC
(Reporting by Ankika Biswas in Bengaluru)