Here's a more complete description of the activity

Here's a more complete description of the activity.  It seems as if it's a mute point anyway as most of the action is no longer occurring.  It reads to me like it was a way for the settlement of short positions to be completed via lending of shares from willing participants to allow for a smooth settlement process.  Doesn't look like it's being used that much anymore.  Always nice to see the potential for abuse being mitigated by on-going changes to SEC rules.

http://www.sec.gov/rules/sro/nscc/2013/34-71156.pdf