NEW YORK (TheStreet) -- MGT Capital Investments  (MGT) stock is down 12.05% to $3.65 on heavy trading volume early Tuesday afternoon, reversing gains of 34% this morning. 

The stock is on track to end a seven-session winning streak.

Shares of the acquisition firm have spiked more than 15 fold since May 6, with this month's surge beginning after MGT announced on May 9 plans to appoint John McAfee as CEO, MarketWatch reports. McAfee founded antivirus software company McAfee, which Intel (INTC) acquired in 2010. 

Additionally, current MGT CEO Robert Ladd purchased a 5.01% stake in vitro diagnostic company Venaxis (APPY), according to a regulatory filing, MarketWatch adds. The stake includes a 2.89% stake indirectly owned by MGT.

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Venaxis stock is down 2.71% to $4.31.

About 68.07 million shares of MGT have been traded so far today, well above the company's average trading volume of roughly 11.56 million shares per day. 

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