RE:SPI might be wrong, but I have seen this before of price manipulation to shake out the warrant holders. Today is the expiration date, so you will see on Monday whether the price can hold. THere is no news, and as far as I can see, no insider buying (which they may not be able to do right now anyway), so this is a supported buy by someone to keep price above exercise price. I could see the SP back in the 60's next week.