Despite early reports of turmoil in Greece, U.S. stocks have battled their way into the black this afternoon. Traders are cheering speculation that Greek lawmakers are close to finalizing a deal that would secure 130 billion euros in aid for the debt-saddled country, although striking workers may not be pleased with the concomitant cost-cutting measures. Fed Chairman Ben Bernanke is also in focus, as the central banker's tour of Capitol Hill continues. Speaking today before the Senate Budget Committee, Bernanke reiterated his call for long-term deficit reduction, and asserted, "We are not going to seek higher inflation in order to advance unemployment" -- which was likely music to the ears of a few agitated policy hawks. Meanwhile, a well-received earnings report from blue-chip beverage giant Coca-Cola (KO) is also helping the bullish case. In fact, despite today's rather timid gains, both the Dow and Nasdaq Composite have ventured into annual-high territory.

At last look, the Dow Jones Industrial Average (DJIA - 12,879.49) has added 34.4 points, or 0.3%. Earlier, the Dow tapped a fresh annual high of 12,884.14. The S&P 500 Index (SPX - 1,346.71) is up 2.4 points, or 0.2%, and the Nasdaq Composite (COMP - 2,906.96) has risen about 5 points, or 0.2%. Like the Dow, the COMP rose to a new annual high of 2,910.27.

Checking in on Dow components, McDonald's (MCD - 100.80) and Coca-Cola (KO - 66.86) are up more than 1% apiece to lead the 16 advancing stocks. Verizon (VZ - 37.82) is down 0.8% to pace the 14 laggards.

The CBOE Market Volatility Index (VIX - 17.61) has erased its morning gains to trade down 0.8% this afternoon. The "fear index" retreated after a brief surge above the 18 level, which served as a technical ceiling on Monday.

Among equities in focus, InterDigital (IDCC - 37.95) has slumped 6.7% after providing weak first-quarter revenue guidance. On the other hand, Amylin Pharma (AMLN - 17.02) has tacked on 2% amid a flurry of post-earnings price-target hikes. Elsewhere, Sohu.com (SOHU - 51.86) is deepening Monday's earnings-related decline, off 2.9% after a downgrade to "neutral" at Susquehanna. Over in the options pits, Groupon (GRPN) was targeted by pre-earnings call players, while electric automaker Tesla Motors (TSLA) garnered some potentially bullish attention.

Analysts are weighing in today on semiconductor stock Advanced Micro Devices, Inc. (AMD - 7.04), financial content publisher Bankrate, Inc. (RATE - 24.63), Provenge parent Dendreon Corporation (DNDN - 16.47), satellite radio specialist Sirius XM Radio Inc. (SIRI - 2.12), and Chinese Internet issue Sohu.com Inc. (SOHU - 52.12). Here's a quick roundup of today's upgrades and downgrades of note.

• The onslaught of bullish brokerage notes continues for AMD, as Longbow today raised its rating on the stock to "buy" from "neutral." Last Friday, the chip giant scored a trio of price-target hikes, and Barclays followed suit on Monday by lifting its target to $7 from $5. AMD is up 1.7% at last look, building on its impressive 2012 surge of 28.1%. If the stock's positive price action continues, AMD could easily benefit from additional upgrades. Currently, Zacks tallies nine "buy" or better ratings from analysts, compared to 14 "holds" and four "sell" or "strong sell" suggestions.
• Meanwhile, RATE garnered some mixed attention on the heels of last night's fourth-quarter earnings report. Stifel Nicolaus downgraded the shares to "hold" from "buy," while the stock attracted price-target hikes from Citigroup (to $31 from $22) and RBC (to $26 from $24). RATE ticked lower right out of the gate this morning, but has since bounced back to a gain of 1%. Since early December, in fact, the shares have climbed consistently higher along the support of their 10-day and 20-day moving averages.
• Canaccord Genuity raised its price target on DNDN to $18 from $16, but the stock is down 0.4% in mid-morning action. Of course, with DNDN sitting on a robust year-to-date advance of 117.5%, it seems quite possible that the shares are simply due to consolidate some of their recent gains. And, with nearly 24% of the equity's float sold short, there are still plenty of potential buyers lingering on the sidelines.
• Turning to SIRI, the shares have shed 1.4% after Barclays initiated coverage with an "underweight" rating and $2 price target. As a result, SIRI is moving back toward the lower rail of its recent trading range between $2 and $2.20, which has confined the stock's progress throughout the past four weeks. During the short term, heavy open interest accumulations could reinforce this sideways channel. Currently, SIRI is trading between peak put open interest of 5,710 contracts at the February 2 strike, and substantial call open interest of 9,914 contracts at the February 2.50 strike.
• Finally, SOHU was downgraded to "neutral" from "positive" at Susquehanna on the heels of Monday's poorly received first-quarter forecast. The stock is sitting on a deficit of 2.4% today, adding to yesterday's drastic 18% drop. Thanks to its post-earnings freefall, SOHU is now set to snap a three-week winning streak above its 20-week moving average. Going forward, this trendline could resume its previous role as resistance.

Despite a modestly bearish slant on Wall Street today, there are still plenty of stocks climbing to new bullish milestones. The NYSE reports 91 equities at annual highs, along with just one lone laggard falling to a fresh 52-week low. Meanwhile, the Nasdaq has collected 80 new highs, compared to five annual lows. Among the day's notable gainers is Rackspace Hosting, Inc. (RAX - 47.91), which earlier elbowed its way to a new record peak.

Specifically, RAX topped out at $48.49 -- marking the third day in a row the stock has set a new all-time high for itself. RAX is continuing a recent breakout above resistance in the $45-$47 area, which had capped the security's rally attempts since April 2011.

However, options players seem skeptical that RAX can continue to climb the charts. During the past 10 sessions, speculators on the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX) have bought to open 2.15 puts for every call on RAX. This ratio registers in the 84th percentile of its annual range, suggesting that traders have rarely purchased bearish bets over bullish at a faster clip.

Traders should stay tuned to RAX over the next week, as the tech issue is due to reveal its fourth-quarter earnings after the market closes on Monday, Feb. 13. The company has a respectable history on the earnings stage, having surpassed consensus profit estimates in three of the past four quarters. With a healthy 9.7% of RAX's float sold short, an upside surprise next Monday could spark another surge higher for the shares.

U.S. stocks are treading red ink at midday, as Greek debt anxiety has dampened investors' post-payrolls enthusiasm. With no domestic economic reports on the day's docket, traders have been left to take their cues from rising fiscal turmoil in the euro zone. Bailout officials from the European Union (EU), European Central Bank (ECB), and International Monetary Fund (IMF) are demanding another round of austerity measures in exchange for a much-needed aid package, but some Greek politicians are digging in their heels. German Chancellor Angela Merkel and French President Nicolas Sarkozy have both urged Greece to ratify the necessary fiscal reforms, while Luxembourg Prime Minister Jean-Claude Juncker -- who spearheads a group of euro-zone finance ministers -- warned that the alternative to these austerity measures could be a bankruptcy filing as soon as March. As we head into the second half of the session, all three major equity indexes are sitting on modest losses.

At last look, the Dow Jones Industrial Average (DJIA - 12,827.98) is down 34.3 points, or 0.3%. The S&P 500 Index (SPX - 1,343.08) has slipped 1.8 points, or 0.1%, and the Nasdaq Composite (COMP - 2,902.25) is off 3.4 points, or 0.1%.

Checking in on Dow components, Walt Disney (DIS - 40.56) is up 1.4% to lead the eight advancing blue chips into the black. Earlier, DIS was upgraded to "buy" from "neutral" at Davenport. On the other hand, American Express (AXP - 51.44) has shed 1.6% to lead the 22 laggards into the red.

The CBOE Market Volatility Index (VIX - 17.92) has jumped 4.8% at last look, though its positive momentum has so far been stopped short in the 18 area.

Among equities in focus, Humana (HUM - 85.89) has declined 4.5% after offering less-than-stellar earnings guidance for fiscal 2012. Lazard (LAZ - 27.53) is another post-earnings laggard, down 4.7% on the heels of its quarterly results. On the brokerage front, Regeneron Pharma (REGN - 101.08) has shrugged off a Piper Jaffray downgrade to gain 4.4%, after earlier tagging a new all-time high of $101.47. Over in the options pits, Aruba Networks (ARUN) was targeted by put buyers, while call players have set their sights on MEMC Electronic Materials (WFR).

Analysts are weighing in today on global courier FedEx Corporation (FDX - 94.96), agricultural equipment giant Deere & Company (DE - 87.23), casino operator MGM Resorts International (MGM - 14.11), biotech stock Regeneron Pharmaceuticals, Inc. (REGN - 99.37), and wide-area network specialist Riverbed Technology, Inc. (RVBD - 26.65). Here's a quick roundup of today's upgrades and downgrades of note.

• Starting with FDX, the stock scored an upgrade to "buy" from "neutral" at Bank of America-Merrill Lynch. As a result, FDX has been able to buck a bearish bias in the equities market today, up 0.4% at last look. The shares have gained an impressive 13.2% so far in 2012, but FDX is now staring up at a familiar technical hurdle. Since September 2008, the stock's rally attempts have consistently been halted by resistance in the $96-$98 neighborhood.
• ISI Group lowered its rating on DE to "hold" from "buy," which has triggered a 1.3% drop in the shares at last check. Ahead of this downgrade, analysts were pretty evenly split on DE, with Zacks reporting eight "strong buys," eight "holds," and one "strong sell." However, the farming equipment firm has been stellar on the charts so far this year, racking up a gain of 14.3% since the beginning of January. Despite today's dip, DE remains north of short-term support at its 20-day moving average.
• Gambling mogul MGM is off 1.8% in today's trading, pressured by a downgrade to "neutral" from "buy" at Goldman Sachs. With the stock up nearly 61% from its mid-December low of $8.95, the brokerage firm seems to be growing leery of MGM's ability to keep climbing. Skepticism is also evident elsewhere on Wall Street, as a hefty 12.5% of the equity's float is dedicated to short interest.
• Jefferies raised its price target on REGN to $111 from $75, even as Piper Jaffray downgraded the stock to "neutral" from "overweight." The stock is 2.6% higher at last check, after earlier tagging a new all-time peak of $99.62. REGN has rallied nearly 75% so far in 2012, and the stock's Relative Strength Index (RSI) is now docked at a lofty 87 -- but, judging by today's gains, the shares aren't ready to take a breather just yet.
• Finally, RVBD was raised to "outperform" from "sector perform" at Pacific Crest, prompting a 2.8% gain in mid-morning action. The stock is on track to close the session atop its 10-day moving average for the first time since Jan. 27, when RVBD's soft first-quarter forecast sparked a major bearish gap. Most brokerage firms remain upbeat toward RVBD, despite the cloudy outlook. Currently, Zacks tallies 18 "buy" or better endorsements, compared to 12 "hold" or "sell" suggestions.