Plug Power -8.2%, hits short-sale circuit breaker

|By:, SA News Editor

Trading in Plug Power (PLUG -8.2%) triggered a securities short-sale circuit breaker earlier this afternoon after shares dropped as much as 9% and more than 17% so far this week following big gains in previous weeks.

PLUG shares opened strong yesterday but faded after Volkswagen shot down rumors of a deal between the two companies.

CNN's Kevin Kelleher worries PLUG is more than just another classic speculative rally run amok - it is a symptom of an increasingly erratic market suggesting not just a tolerance toward but also a growing appetite for deals that can't be rationalized.

Ballard Power Systems (BLDP), which provides fuel cell stacks to PLUG equipment, -7.5%.