Analyst upgrades:

• Keefe Bruyette upgraded Blackstone Group (BX) to outperform from market perform following the company's Q3 results and maintains an $18.50 price target on shares.
• Baird upgraded Astec (ASTE) to outperform from neutral citing relative valuation and upside from new multi-year U.S. highway funding legislation. The firm raised its target to $33 from $27.
• Goldman upgraded Abercrombie & Fitch (ANF) to conviction buy from neutral citing "significant" long-term growth drivers that include international growth. The firm raised its target to $45 from $36.
• Ariad Pharmaceuticals (ARIA) was upgraded to overweight from neutral at JPMorgan.
• Energizer (ENR) was upgraded to overweight from equal weight at Morgan Stanley.
• AstraZeneca (AZN) was upgraded to buy from hold at RBS.

Analyst upgrades:

• FBR Capital upgraded M&T Bank (NYSE: MTB) to Market Perform from Underperform following the Q3 results to reflect the company's improved earnings outlook and better credit trends. The firm has a $70 price target on shares.
• Kaufman Bros. upgraded Autodesk (NASDAQ: ADSK) to Buy from Hold as it believes a bottom has been reached in the manufacturing and construction industries. The firm raised its target on shares to $30 from $26.
• Goldman upgraded Caterpillar (NYSE: CAT) to Neutral from Sell and raised its target to $64 from $48 citing improved cost controls and construction outlook.
• Pentair (NYSE: PNR) was upgraded to Buy from Hold at KeyBanc.
• Lexmark (NYSE: LXK) was upgraded to Neutral from Underweight at JPMorgan.
• Stryker (NYSE: SYK) was upgraded to Neutral from Underperform at BofA/Merrill.

Analyst upgrades:

• Keefe Bruyette upgraded KeyCorp (NYSE: KEY) to Outperform from Market Perform due to valuation and the company's capital position. The firm has an $8 target price on the stock.
• BofA/Merrill upgraded its view of the semiconductor sector and upgraded Intel (NASDAQ: INTC) and Marvell Technology (NASDAQ: MRVL) to Buy from Neutral, LSI Corp. (NYSE: LSI) to Buy from Underperform, and Maxim (NASDAQ: MXIM) and National Semiconductor (NYSE: NSM) to Neutral from Underperform. The firm now sees 2010 revenue growth of 21% vs. its prior estimate of 14% due to improving electric demand and lean inventories.
• Thomas Weisel upgraded Vital Images (NASDAQ: VTAL) to Overweight from Market Weight based on compelling valuation and potential upside from its new ViTAL Enterprise product offering.
• Jones Apparel (NYSE: JNY) was upgraded to Buy from Neutral at Goldman.
• Hess Corp. (NYSE: HES) was upgraded to Overweight from Equal Weight at Barclays.
• Nationwide Health (NYSE: NHP) was upgraded to Outperform from Market Perform at Morgan Keegan.

Here are some highlights from this past week's earnings coverage from BloggingStocks:

• Astec Industries Inc. (NASDAQ: ASTE) beat expectations and raised its guidance.
• Blockbuster Inc. (NYSE: BBI) fourth-quarter profit fails to offset the full-year loss.
• China Techfaith Wireless Communication Technology (NASDAQ: CNTF) beat analysts' expectations.
• Costco Wholesale Corp. (NASDAQ: COST) met analysts' estimates, buoyed by higher fuel prices.
• FTI Consulting Inc. (NYSE: FCN) beat expectations and raised its full-year guidance.
• H&R Block Inc. (NYSE: HRB) narrowed its loss due to higher sales and smaller subprime losses.
• Jackson Hewitt Tax Service Inc. (NYSE: JTX) missed estimates as third-quarter profits declined sharply.
• LifeCell Corp. (NASDAQ: LIFC) beat fourth-quarter estimates and offered full-year guidance.
• Marvell Technology Group (NASDAQ: MRVL) lowered its first-quarter forecast , sending shares lower.
• Porsche AG (OTC: PSEPF) profit soared on strong sales of its Cayenne.
• S1 Corp. (NASDAQ: SONE) beat expectations and offered full-year guidance.
• Saks Inc. (NYSE: SKS) fourth-quarter profit nearly doubled, but full-year profit declined.
• Urban Outfitters Inc. (NASDAQ:URBN) beat expectations on strength in same-store sales.
• Walgreen Co. (NYSE: WAG) reports strong same-store sales ahead of its quarterly results.

Also, see Timothy Sykes's take on Warren Buffett's annual letter to Berkshire Hathaway (NYSE: BRK.A) shareholders. Zac Bissonnette is interested in where earnings actually come from. And Saks, Costco, and other retailers saw stronger February same-store sales despite recession concerns, but JC Penney Co. (NYSE: JCP) didn't feel the love.

Upcoming results to watch for include Kroger Co. (NYSE: KR), Boston Beer Co. (NYSE: SAM), J. Crew Group Inc. (NYSE: JCG), Jones Soda Co. (NASDAQ: JSDA), Blackstone Group (NYSE: BX), and Men's Wearhouse Inc. (NYSE: MW).

Visit AOL Money & Finance for more earnings coverage.

Astec Industries (NASDAQ: ASTE) manufactures specialized equipment for building and restoring infrastructure. The firm provides aggregate processing and mining equipment; asphalt production equipment; mobile asphalt paving equipment; and underground boring, directional drilling and trenching equipment. It also has a unit in the wood grinding and processing industry. Caterpillar (NYSE: CAT) is a major competitor.

The Street was surprised last week, when Astec reported Q4 EPS of 50 cents and revenues of $221 million. Analysts had been expecting 41 cents and $200.9 million. Management also guided FY08 EPS to $2.80-$2.95 ($2.77 consensus) and FY08 revenues to $1 billion ($930.05 million consensus).