The following is a list of high volume gainers with bullish option market sentiment, i.e. a large number of open call option positions relative to put option positions.
For each stock, we'll list the Relative Volume indicator, which expresses Thursday's trading volume as a multiple of the 3-month average volume.
Relative Volume data sourced from Finviz, options data sourced from Schaeffer's. 
1. Pharmasset, Inc. (VRUS): Drug Manufacturer. Market cap of $1.15B. Today's relative volume at 2.66, with the stock gaining 2.77% at the time of writing. Call open interest at 1,749 contracts vs. put open interest at 176 contracts (Put/Call ratio at 0.1).
2. Titan Machinery, Inc. (TITN): Specialty Retail, Other Industry. Market cap of $352M. Today's relative volume at 3.51, with the stock gaining 5.12% at the time of writing. Call open interest at 2,099 contracts vs. put open interest at 274 contracts (Put/Call ratio at 0.13).
3. Huntsman Corporation (HUN): Chemicals Industry. Market cap of $3.24B. Today's relative volume at 2.24, with the stock gaining 5.78% at the time of writing. Call open interest at 73,727 contracts vs. put open interest at 10,403 contracts (Put/Call ratio at 0.14).
4. Select Comfort Corporation (SCSS): Home Furnishings & Fixtures Industry. Market cap of $433M. Today's relative volume at 4.45, with the stock gaining 17.81% at the time of writing. Call open interest at 2,133 contracts vs. put open interest at 316 contracts (Put/Call ratio at 0.15).
5. Sally Beauty Holdings Inc. (SBH): Specialty Retail, Other Industry. Market cap of $2.24B. Today's relative volume at 2.34, with the stock gaining 5.67% at the time of writing. Call open interest at 430 contracts vs. put open interest at 76 contracts (Put/Call ratio at 0.18).
6. Rite Aid Corp. (RAD): Drug Stores Industry. Market cap of $846M. Today's relative volume at 1.58, with the stock gaining 4.24% at the time of writing. Call open interest at 7,659 contracts vs. put open interest at 1,391 contracts (Put/Call ratio at 0.18).
7. Fortress Investment Group LLC (FIG): Asset Management Industry. Market cap of $2.08B. Today's relative volume at 3.29, with the stock gaining 6.19% at the time of writing. Call open interest at 30,752 contracts vs. put open interest at 5,742 contracts (Put/Call ratio at 0.19).
8. Penn National Gaming Inc. (PENN): Resorts & Casinos Industry. Market cap of $2.56B. Today's relative volume at 2.45, with the stock gaining 5.32% at the time of writing. Call open interest at 12,708 contracts vs. put open interest at 3,052 contracts (Put/Call ratio at 0.24).
9. Orbitz Worldwide, Inc. (OWW): General Entertainment Industry. Market cap of $689M. Today's relative volume at 3.25, with the stock gaining 3.53% at the time of writing. Call open interest at 726 contracts vs. put open interest at 175 contracts (Put/Call ratio at 0.24).
10. Kohlberg Kravis Roberts & Co. (KKR): Asset Management Industry. Market cap of $2.42B. Today's relative volume at 2.59, with the stock gaining 3.69% at the time of writing. Call open interest at 787 contracts vs. put open interest at 211 contracts (Put/Call ratio at 0.27).
11. China Yuchai International Limited (CYD): Diversified Machinery Industry. Market cap of $874M. Today's relative volume at 5.05, with the stock gaining 11.51% at the time of writing. Call open interest at 8,240 contracts vs. put open interest at 2,228 contracts (Put/Call ratio at 0.27).
12. Valley National Bancorp (VLY): Regional Bank. Market cap of $2.1B. Today's relative volume at 2.06, with the stock gaining 3.4% at the time of writing. Call open interest at 12,907 contracts vs. put open interest at 3,648 contracts (Put/Call ratio at 0.28).
13. Alkermes, Inc. (ALKS): Drug Delivery Industry. Market cap of $1.06B. Today's relative volume at 3.13, with the stock gaining 5.71% at the time of writing. Call open interest at 26,708 contracts vs. put open interest at 9,158 contracts (Put/Call ratio at 0.34).
14. WESCO International Inc. (WCC): Industrial Equipment Wholesale Industry. Market cap of $2.B. Today's relative volume at 4.24, with the stock gaining 5.12% at the time of writing. Call open interest at 2,234 contracts vs. put open interest at 827 contracts (Put/Call ratio at 0.37).
15. United Rentals, Inc. (URI): Rental & Leasing Services Industry. Market cap of $1.11B. Today's relative volume at 3.22, with the stock gaining 4.09% at the time of writing. Call open interest at 18,217 contracts vs. put open interest at 7,023 contracts (Put/Call ratio at 0.39).
Disclosure: No positions
