Lightstream, Legacy, Southern Pacific, Connacher, GASFRAC and Quicksilver didn't return requests for comment. Heidi Christensen Brown, a spokeswoman for Laricina, declined in an e-mail to comment. SandRidge, Oasis and Laredo are among the 10 worst-performing companies on the Russell 1000 Energy Index in the last six months, while Legacy and Lightstream have fallen the most on the Standard & Poor's/TSX Energy Index. Lightstream announced the suspension of its dividend and an asset sale Monday. Low oil prices could threaten one of the terms of a $1.15-billion credit facility before the end of the year, the company said in a statement. SandRidge, Oasis, Energy XXI, Bill Barrett and Magnum Hunter didn't respond to e-mail and phone messages seeking comment. Laredo declined to comment in an e-mail.