Pfenex Inc. (PFNX) had a rough trading day for Friday October 04 as shares tumbled 6.05%, or a loss of $-0.48 per share, to close at $7.46. After opening the day at $7.97, shares of Pfenex Inc. traded as high as $8.00 and as low as $6.96. Volume was 634,974 shares over 3,131 trades, against an average daily volume of n/a shares and a total float of 31.6 million.

VirnetX Holding Corp (VHC) had a rough trading day for Friday October 04 as shares tumbled 6.23%, or a loss of $-0.39 per share, to close at $5.87. After opening the day at $6.26, shares of VirnetX Holding Corp traded as high as $6.53 and as low as $5.71. Volume was 1.06 million shares over 5,099 trades, against an average daily volume of n/a shares and a total float of 68.95 million.

Teekay Tankers Ltd. (TNK) had a good day on the market for Thursday October 03 as shares jumped 7.2% to close at $1.34. About 1.66 million shares traded hands on 5,594 trades for the day, compared with an average daily volume of n/a shares out of a total float of 269 million. After opening the trading day at $1.25, shares of Teekay Tankers Ltd. stayed within a range of $1.35 to $1.25.

GoPro Inc. (GPRO) had a rough trading day for Thursday October 03 as shares tumbled 19.01%, or a loss of $-0.975 per share, to close at $4.16. After opening the day at $4.24, shares of GoPro Inc. traded as high as $4.28 and as low as $3.80. Volume was 36.34 million shares over 79,043 trades, against an average daily volume of n/a shares and a total float of 154.12 million.

TerraForm Power Inc. (TERP) had a rough trading day for Thursday October 03 as shares tumbled 5.23%, or a loss of $-0.95 per share, to close at $17.20. After opening the day at $18.17, shares of TerraForm Power Inc. traded as high as $18.32 and as low as $17.16. Volume was 1.84 million shares over 14,581 trades, against an average daily volume of n/a shares and a total float of 209.15 million.

Exact Sciences Corporation (EXAS) had a good day on the market for Thursday October 03 as shares jumped 5.9% to close at $92.62. About 2.83 million shares traded hands on 28,127 trades for the day, compared with an average daily volume of n/a shares out of a total float of 129.49 million. After opening the trading day at $87.28, shares of Exact Sciences Corporation stayed within a range of $92.97 to $86.88.

Among the S&P 500’s biggest fallers on Wednesday October 02 was American Express Company (AXP). The stock experienced a 3.29% decline to $112.86 with 4.91 million shares changing hands.

October 02 was a positive day for Continental Gold Inc. (CNL:CA) as its stock finished the day having gained 6.82% to hit a price of $4.07 a share. The company reached a market cap of 814.04 million and has 203.11 million shares outstanding. Continental Gold Inc. is a component of the the S&P/TSX SmallCap Index.

Among the S&P 500’s biggest fallers on Wednesday October 02 was Eli Lilly and Company (LLY). The stock experienced a 3.57% decline to $107.00 with 4.48 million shares changing hands.

It was a tough day for Secure Energy Services Inc. (SES:CA) as its stock fell 5.08% to finish the day at $5.04 a share on October 02. That reduces the company’s market cap to 798.6 million on 158 million outstanding shares. Secure Energy Services Inc. is a component of the the S&P/TSX SmallCap Index.