CryoPort Inc (CYRX)

[hyperopia]

You guys do know about dark pools, right? They are lightly-regulated private trading venues set up by the large investment banks to bypass the major exchanges to lower their trading costs, and allow institutional investors to match large buy and sell orders without displaying the quote to the public, discretely masking their activities (and theoretically lowering volatility). The volume continues to grow, and now I would guess almost half of all trading is done this way, and often in pre/after market hours.

Not sure about others but Charles Schwab’s, StreetSmartEdge platform has a “block trade indicator”, and TD Ameritrade’s ThinkOrSwim platform has “trade flash”, where some large trades can be monitored real time.

Further reading:
http://www.finra.org/investors/can-you-swim-dark-pool

http://www.traderplanet.com/articles/view/167551-track-the-dark-pools-with-the-balance-of-power-bop-indicator/