Monday kicks off a busy earnings week with a substantial amount of S&P 500 firms reporting during the week including a large amount of tech and bio pharma giants. For Monday, the interesting earnings reports come from McDonald's (MCD) and Halliburton (HAL). My other interesting plays for Monday are as follows:Qualcomm (QCOM) - the late Friday lawsuit by Apple (AAPL) might bring pressure to the wireless chip giant. Apple is claiming Qualcomm has withheld $1 billion from rebates owed to the tech giant. That amount isn't overly meaningful. The big concern is whether the lawsuit by the U.S. FTC combined with the Korean agency changes the business model and this lawsuit confirms that Apple is the snitch. News will be very fluid in this area tomorrow and all next week. Acacia Communications (ACIA) - the optical networking stock continues to struggle to end the huge downtrend from $130 that started in September. The stock ended down 1.3% on Friday and needs another up day on Monday to prevent a continuation of the downtrend. The risk still remains that Acacia drops to $40. Twilio (TWLO) - a small down day on Friday still kept the stock above $28. A possible trade exists with a mental stop around $27.50. CSX Corp. (CSX) - watch for more profit taking as logic returns to this railroad. Any work by the ex-CEO of Canadian Pacific Railway (CP) is far off and the ability to greatly cut labor costs isn't guaranteed while the market has already priced in all the benefits. 3D Systems (DDD) - the stock continues to move higher on buyout rumors. The best way to play this rumor that might have some validity is Stratasys (SSYS) that trades at a 50% discount. Click on the Sign in/Sign up button in the top right corner to join for free to comment on your stock moves for Friday, January 13 and enter the discussion.Click on the Follow button to get the daily blog posts from Out Fox The $treet. Disclosure: Long AAPL, QCOM