There is still no word on whether LeBron James himself has been loading up on stock in publicly-traded Madison Square Garden, Inc. (which would trigger the insider trading hypothetical I posed here back in May), but multiple markets are seeing heavy trading in the lead up to LeBron's scheduled announcement tonight on where he will sign as a free agent.

First, perhaps on rumors that LeBron was bound (or not bound) for the New York Knicks, MSG stock bobbed up and down Wednesday and Thursday of this week on trading volume about 500% greater than normal. Today, Reuters reports, MSG has already seen roughly 13,000 call option trades, about 36 times its expected single-session call volume.

The InTrade prediction markets, however, have seen a surge of trades in recent days betting that LeBron will be signing with the Miami Heat. Here is the latest chart showing how the Heat have gone from dark horse to favorites in the LeBron James sweepstakes:

CNBC has a good summary of all of the LeBron-a-thon trading in the video below.

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