Here are the IPv4 allocations made yesterday by ARIN that were larger than a /24:

AT&T Internet Services – /12
QuickPacket LLC – /19
The Bahamas Telecommunications Company Ltd – /20
Co-Mo Comm Inc – /21

There were four /24s allocated.  Some blocks were returned.

A /12 is the equivalent of 0.0625 /8s, which is the largest block allocated for quite some time.