Yep - that's definitely what is causing the imbalance. I just think since the exp and strike are almost the exact same they should be worth the same amount. Or actually, the strike price is .69 cheaper for SDRWW yet it's half the price of SDRDW. That doesn't seem significant at the moment, but imagine if the commons were trading at $42 SDRWW would be worth .69 more than SDRDW