In late July, The Motley Fool started our "11 O'Clock Stock" series, which challenged our analysts to pick 50 stocks over 50 weekdays. While we're only a short way into watching this group of stocks that we think will be long-term winners, many have already seen impressive gains while others have seen set-backs.

In this column, we're going to take a close look at three stocks that have taken off and three that are lagging behind.

Three stocks soaring
One of the better-performing sectors in the portfolio has been the semiconductor industry. Checking in with the "11 O'Clock Stock" CAPS page, Texas Instruments (NYSE: TXN), Qualcomm (Nasdaq: QCOM), and Marvell (Nasdaq: MRVL) are all up more than 20% from their recommendation prices. As a group, they're outperforming the market by a combined 39 percentage points. All three have rebounded strongly from lows during the summer, when concerns mounted that rising inventories and accounts receivables across semiconductor companies could mean a sudden slowdown in this volatile industry.

Of particular note was Qualcomm's outstanding quarter. The rise of Google's Android operating system has been a boon to the company; not only does it create more demand for smartphones that sell for higher prices and thus give Qualcomm more licensing revenue, but Qualcomm has also become a popular chip supplier for Android phones. Estimates from consulting firm PRTM say Qualcomm chips can be found in 77% of current Android phones.

However, another catalyst might be right around the corner. Rising inventories during the quarter hinted that Qualcomm could be building out supplies for a Verizon iPhone in early 2011. Even more enticing is the possibility of Apple (Nasdaq: AAPL) selecting Qualcomm as the provider of chips for a possible "worldmode" iPhone that would be able to connect to networks similar to both Verizon's and AT&T's. The worldmode phone is just a rumor, but given that Qualcomm wasn't in the discussion for any components in the iPhone last year, it presents a tantalizing opportunity.

  • Click here to see Qualcomm's buy recommendation
  • Click here to see Texas Instrument's buy recommendation
  • Click here to see Marvell's buy recommendation

Three stocks sagging
One of the portfolio laggards facing the most pressure recently has been National Bank of Greece (NYSE: NBG). While Ireland has come under particular focus recently, Greece also still faces the possibility of default. The Council of Foreign Relations recently issued a report stating that Greece would be better off defaulting even if it's successful in eliminating its primary deficit. With National Bank of Greece holding large amounts of Greek debt, the bank will stay under pressure as long as default fears surround Greece.

Two other portfolio laggards are generic drug maker Teva Pharmaceutical (Nasdaq: TEVA) and smart-grid play EnerNOC (Nasdaq: ENOC). EnerNOC released earnings last night, and while it crushed Wall Street's earnings estimate for last quarter, tepid guidance caused investors to sell off the shares 14% this afternoon. Along with other companies in the smart-grid industry, EnerNOC trades at a pretty rich multiple. As investors have also seen in the richly priced cloud-computing industry, buyers searching out growth have aggressively bid up companies in the industry, but the stocks are also prone to large sell-offs when the companies issue any signs of future weakness. The stock's roller coaster ride might be nauseating, but with the stock down 25% from its original recommendation price, several analysts at the Fool see a good entry point for picking up shares.

While the rationale for EnerNOC's sell-off is fairly obvious, there's little in the way of news to explain Teva's underperformance since its recommendation two months ago. If you were intrigued by the original write-up on the company, but were waiting on a better value from the company, now might be a good time to take another look or add the company to your watchlist.

  • Click here to see National Bank of Greece's buy recommendation
  • Click here to see EnerNOC's buy recommendation
  • Click here to see Teva's buy recommendation

If you're interested in seeing more selections from our "11 O'Clock Stock" series, we've put together a special report highlighting five of our top ideas -- with two extra bonus picks for free. You can get access to the report by clicking here now.

Eric Bleeker owns shares of National Bank of Greece. Google is a Motley Fool Inside Value selection. EnerNOC and Google are Motley Fool Rule Breakers picks. Apple is a Motley Fool Stock Advisor recommendation. The Fool owns shares of Apple, Google, Marvell, National Bank of Greece, Qualcomm, Teva Pharmaceutical, EnerNOC, and Texas Instruments. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.