Gaming Partners does not carry over negative balances.
http://www.kiwicasino.com/adv/howitworks.html
The groups below do carry over negative balances. This is not by any means a complete list.
CWC Affiliates
Mainstreet Affiliates
Bodog
888.com
Cpays
Earn United
Euro Partners
Focal Click – “Negative balances will default to zero at the beginning of the following month in order to give you a fresh start for the month provided you have at least 3 separate distinct and unique players playing for that month.”
WagerShare – “If a player wins more than $10,000 there is carry over on that player only.”