NEW YORK (TheStreet) -- Shares of GoPro (GPRO) are declining by 0.42% to $59.80 in after-hours trading Thursday, amid short-selling on concerns regarding the wearable camera maker's December 23 lockup expiration.
Also, analysts at Citigroup issued a cautious note this morning after speaking with the CEO of GoPro's rival company, iON Cameras.
Citigroup reiterated its "neutral" rating, saying it is "incrementally more cautious" on shares of GoPro, and sees potential risk to its 2015 revenue growth estimate of 22% due to increased competition and a likely industry slowdown following the HERO4 camera launch.
Analysts at the firm noted that iON claims to have the most comprehensive product portfolio in the action camera market with 10 different cameras.
Shares of GoPro closed down, lower by 4.32% to $60.05, in the regular trading session today.