Spongetech Delivery Systems, Inc. (fka SPNGQ)

[overachiever]

What are some of the other possibilities, that would cause REG SHO for 19 days?

The most common cause with penny stocks is contract short sales through Europe whereby insiders (most likely RME in this case) with large holdings liquidate restricted stock early. The stock position is balanced out when the restrictive legends are removed. In the meantime, the insiders pay a fee to the European liquidators. These programs have been around since the early 90s and take advantage of international arbitrage laws.

This stock is listed on the Frankfurt, so there you have it.