If you are looking for clues telling you which stocks have a good chance of increasing in value, you might want consider watching what insiders are doing. After all, talk is cheap, but when insiders put their own money on the line, you should sit up and take note.

Ziopharm Oncology (ZIOP) topped the insider-buying charts for the week ending January 21, as insiders snapped up 2,426,240 shares of the company's stock at a market value of $11,645,952. During the past six months, insiders have increased their overall holdings in the company by 0.00% and now own 2.44% of ZIOP stock.

Analyst Upgrades

• Stifel Financial (SF) and CVR Energy (CVI) to buy from neutral and Principal Financial (PFG) to conviction buy from buy at Goldman.
• Suntech (STP) to buy from hold at Auriga.
• Internap (INAP) to outperform from sector perform at RBC Capital.
• Andersons (ANDE) to buy from hold at BB&T.

The focus of last week's preview was on oil and energy companies, and we saw that big oil had a good week, reporting better-than-expected results and record profits driven by high prices in the third quarter. Energy-related companies are well represented again this week and expectations in general remain high.

Early in the week, analysts surveyed by Thomson Financial anticipate that the big earnings gainers will include EOG Resources Inc. (NYSE: EOG), Anadarko Petroleum Corp. (NYSE: APC), and Cimarex Energy Co. (NYSE: XEC), which are expected to post profits of $2.24 per share (up 64.7% from a year ago), $1.48 per share (up 52.7%) and $2.26 per share (up 61.1%) respectively. All three of them have offered positive surprises in recent quarters, and analysts on average recommend buying EOG and Anadarko. Other expected big earnings gainers early in the week include Forest Oil Corp. (NYSE: FST), Pioneer Natural Resources Co. (NYSE: PXD), Comstock Resources Inc. (NYSE: CRK), and MasterCard Inc. (NYSE: MA). The earnings of phosphates producer Innophos Holdings Inc. (NASDAQ: IPHS) are expected to have risen 92.3% to $3.37 per share. Innophos beat estimates in the previous quarter by a whopping 210%, and analysts have been impressed with Innophos's lack of debt and pricing gains despite the slowing economy, so, on average, they recommend buying IPHS.

Also early in the week, analysts expect Goodyear Tire & Rubber Co. (NYSE: GT), Kaiser Aluminum Corp. (NASDAQ: KALU), and Oshkosh Corp. (NYSE: OSK) to report that their profits fell 52.9% to $0.33 per share, 45.1% to $0.67 per share, and 41.2% to $0.67 per share, respectively. These companies have tended to beat estimates in recent quarters, and the consensus recommendations of analysts are to buy them. However, PMI Group Inc. (NYSE: PMI), one of the largest private mortgage insurance providers in the U.S., is expected to take another hit as the housing slump drags on. The California-based company is expected to have widened its net loss from $1.04 per share a year ago to $2.43 per share in the most recent quarter. Its shares are down 84.5% from a year ago, and have been trading recently near their 52-week low.

MOST NOTEWORTHY: U.S. refiners, Rigel Pharma and JetBlue were today's noteworthy upgrades:

• Goldman upgraded the U.S. Refiners to Attractive from Neutral, citing valuations; the firm raised its rating on CVR Energy (NYSE:CVI) and Holly Corp (NYSE:HOC) to Buy from Neutral.
  
• Lehman upgraded shares of Rigel Pharma (NASDAQ:RIGL) to Overweight from Equal Weight following the company's positive R788 data.
  
• Bear Stearns said the Lufthansa (DLAKY) investment gives JetBlue (NASDAQ:JBLU) some breathing room to execute on its turnaround but notes the company's long-term strategy remains in question. Bear raised its rating on JetBlue to Peer Perform from Underperform.

OTHER UPGRADES:

• UBS upgraded Disney (NYSE:DIS) to Buy from Neutral.
  
• Wachovia upgraded Jack in the Box (NYSE:JBX) to Outperform from Market Perform.
  
• Jefferies upgraded United Online (NASDAQ:UNTD) to Buy from Hold.

MOST NOTEWORTHY: Vanguard National Resources, Fuqi and Ulta Salon were today's noteworthy initiations:

• Vanguard National (NYSE: VNR) was initiated at Jefferies with a Buy rating and $19 target, citing the company's yield premium to other MLPs, and at Wachovia with an Outperform rating on valuation and yield.
  
• Merriman believes Fuqi (NASDAQ: FUQI) strong brand and established wholesale distribution will drive increasing market share of China's jewelry market. The firm started shares with a Buy rating.
  
• William Blair resumed coverage of Ulta Salon (NASDAQ: ULTA) with an Outperform rating, as they believed the company's modest current market share and unique offering brings considerable opportunities to take further share from traditional department stores.

OTHER INITIATIONS:

• Goldman initiated Akzo Nobel (OTC: AKZOY) with a Buy rating and Holly Corp. (NYSE: HOC) with a Neutral rating and $63 target.
  
• CVR Energy (NYSE: CVI) was started with a Neutral rating and $27 target at Goldman and with a Buy rating and $27 target at Citigroup.