I'm guessing they're listing acquisitions in the previous 3 years (3 years tends to be a magic number in finance, securities, and tax lookback periods; don't as

I'm guessing they're listing acquisitions in the previous 3 years (3 years tends to be a magic number in finance, securities, and tax lookback periods; don't ask me why, probably hysterical reasons). The atebits acquisition was >36 months ago.