Richard Nottenburg, president and CEO of Sonus Networks, Inc. (NASDAQ:SONS), announced his intention to step down by the end of March 2011. Until then Dr. Nottenburg will remain at his current position and assist the board in its search for a new CEO.

Currently, SONS stock is moving up and its shares made a price change of +7.17%. The market cap pointed 698.52M and the company’s traded volume reached over 4 million shares.

After the recent resistance level at 2.35, now SONS sells at 2.54 but we still can’t conclude it’s going to be a long-term uptrend.

Though the company’s revenue and net income for 2009 are lower than the year before, Sonus Networks expects the gross margin for 2010 to be within its longer term target range of 58% to 62%, and the total operating expenses to reach $146 million.

SONS reported they were satisfied with the significant progress the company has made, their clear market strategy and the launch of NBS-5200, the first product on their next generation ConnexIP™ platform.

The company expects to achieve flat to low single digit percent revenue growth for the year and continues to see the opportunity to grow its product revenues faster than the market.

Jones Soda Co. (NASDAQ:JSDA) made a phenomenal price jump these days. After a resistance level at 1.0, its stock rose up 80.77% and the market cap pointed 49.68M. As a result, JSDA made the biggest % change during the last week.

The reason for the sudden price move is the deal for contribution that Jones Soda Co. and Wal-Mart Stores Inc. has signed recently. The day before the deal was announced, shares in Jones Soda were trading at less than 70 cents per share, and now their price keeps rising up.

Along with the price move, JSDA’s traded volume became huge and if it continues to grow, we can talk about big profit. Currently, the volume is over 13 million, which exceeds its average 3-month value of 840 thousand shares.

Though the company’s revenue and net income for 2009 are lower than the year before, if the Walmart deal turns to be successful, JSDA’s capital will increase. The company’s products will be offered to millions of new customers at 3,800 Walmart stores, which is a great success for its business.

Jones Soda’s website contains all the information on its projects and the company’s financials, and the future results are up to be seen.

Jackson Hewitt Tax Service Inc. (NYSE:JTX) closed on $1.9 yesterday with total volume of almost 4 million shares. It is an 18-percent price jump since May 3, 2010, which put the company among the top market movers.

Though the JTX’s revenue and net income for 2009 are lower than the year before, Jackson Hewitt expects up to $214 million fiscal revenue for 2010, based on the preliminary tax filing results. However, the company is currently 14% down.

The short investors hope to profit from a decline in a stock by borrowing and selling JTX shares. Though if the stock continue to rise, they may be forced to buy the shares back even at a higher price.

Jackson Hewitt Tax Service Inc. is an industry leader providing full service individual federal and state income tax return preparation. Though the company had to reduce its full-time staff by 15%, the management believes it will lead to enhanced accountability and improved future results.

Traders can find additional information on JTX’s financials and its projects on the company’s website, which provides all the news on its business.

Yesterday Ambac Financial Group, Inc. (NYSE:ABK) surged up by 26.29% and closed at $1.20 with total volume of over 68 million shares. This is an amazing jump on the market as the ABK’s average traded volume is about 54 million.

The Amback’s stock price rose up after a resistance level at 0.90, and its market cap reached 346.06M. As a result, it became among the top 10 insurance stocks with the highest short interest on the market.

ABK’s quarterly results for 2010 show a profit but it’s on the basis of a change in tax law, allowing the company to carry back operating losses in 2008 and 2009. The company’s positive earnings for 2009 were a result of non-operating activities and ABK has not generated any new sources of revenues so far.

Based on all the facts, we can assume that no matter the traders took some quick profits, there is no fundamental basis for Ambac’s recent rise and its future remains doubtful.

RRI Energy, Inc. (NYSE:RRI) has made a big success on the market recently. After a resistance level at 4.30, currently RRI is trading at $4.42, which is +2.55% price up on its stock.

During the last week, the company reached the remarkable volume of over 5 million traded shares.

Following the chart, we can see that the current uptrend may be a sign the RRI shares will continue to rise, as well as its stock price.

In its first quarter report for 2010, RRI Energy reported free cash flow of $61 million, compared to $45 million for the first quarter of 2009. However, the company’s net loss was higher than the year before. Still, RRI Energy is in a good position to benefit from improvement in market conditions.

Last year First Energy announced it planned to move from the Midwest ISO to PJM in 2011. In connection with that move, three of RRI’s power plants will also move to PJM. If the transfer turns to be successful, the future forward revenue from all capacity sold in the integration auctions will be approximately $54 million.