Search Bloomberg, available on select computers in the Business Library.

• Type BTR and then hit <GO> to get Block Trade Recap.
• BTR lists trades of 10,000 to 1,000,000 shares on the secondary market.
• Search by exchange and by date going back 11 days.

Use CME Group's Block Trade Browser to search block trades on their exchanges (CBT, CME, COMEX, DUMX, NYMEX).