According to the ETF Finder at ETF Channel, CRR makes up 2.56% of the SPDR S&P Oil & Gas Equipment & Services ETF (XES) which is up by about 1.1% on the day Friday.
In afternoon trading Friday, CRR was up about 1% on the day.
The price of West Texas Intermediate crude oil contracts for December delivery settled down about 2% at $48.70 per barrel on Friday.
Trade-Ideas LLC identified Carbo Ceramics (CRR) as a weak on high relative volume candidate
More than half of outstanding shares of some of these companies are held short though it's not always clear why.