First time accepted submitter saidi writes "The Washington Post reports that yesterday a truly massive Bitcoin transaction occurred, from the article: 'In this particular transaction, bitcoins from 15 different Bitcoin addresses were consolidated and sent to address 12sENwECeRSmTeDwyLNqwh47JistZqFmW8. The size of the transaction? 194,993 bitcoins. Given that one bitcoin is worth around $800 right now, the transaction is valued at more than $150 million.'"
A researcher did a bit of digging, and it appears that this was the Bitstamp exchange moving their balance around (business appears brisk).