My guess would be that these are payouts from a mining pool. People pool their hashing capacity to collectively find a new block worth 50 BTC and the pool then splits the reward between the participants. Some pools probably do this payout step on a fixed schedule.
On the other hand, most pools have moved to include several recipients into a single transaction, so if it is a pool, it's somewhat "outdated".
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My guess would be that these are payouts from a mining pool. People pool their hashing capacity to collectively find a new block worth 50 BTC and the pool then splits the reward between the participants. Some pools probably do this payout step on a fixed schedule.
On the other hand, most pools have moved to include several recipients into a single transaction, so if it is a pool, it's somewhat "outdated".