For China-based firms, the percentage of shares short is not available because the companies are also listed on other exchanges.

Canadian Solar Inc. (NASDAQ: CSIQ) saw short interest rise by 8.3% to 2.08 million shares, about 6.8% of the company’s total float.

First Solar Inc. (NASDAQ: FSLR) short interest drop by 7.4% to 17.07 million shares, which represents 28.1% of the company’s float.

GT Advanced Technologies Inc. (NASDAQ: GTAT) showed an increase of 8% in short interest to 41.34 million shares, about 34.9% of GT’s float.

MEMC Electronic Materials Inc. (NYSE: WFR) showed an increase of 8% in short interest to 16.88 million shares, or about 7.3% of MEMC’s float.

SunPower Corp. (NASDAQ: SPWR) saw short interest rise by 4.1% to 9.52 million shares, or 23.9% of the company’s total float.

JA Solar Holdings Co. Ltd. (NASDAQ: JASO) showed a drop of 17% in short interest to 2.21 million shares.

LDK Solar Co. Inc. (NYSE: LDK) saw short interest fall by 11.9% to 3.03 million shares.

Suntech Power Holdings Co. Ltd. (NYSE: STP) showed a rise of 11.2% in short interest to 18.46 million shares.

Trina Solar Ltd. (NYSE: TSL) saw a short interest decline of 2.3% to 15.79 million shares.

Yingli Green Energy Holding Co. Ltd. (NYSE: YGE) showed a drop of 0.3% in short interest to 7.51 million shares.

In the prior two-week period, Yingli’s short interest rose by 50%. In the most recent two weeks, the very modest rise appears to have drawn a line on just how bad investors think the company’s prospects are. The decline in short interest in LDK is likely due to a lack of fallout from its missed debt repayment. The company may be able to hold on, but that is still questionable. So far the government has not ridden to the rescue for either company, but the thinking may be that it is about to do so.

Short interest in 3D Systems fell 2.9% to 26.54 million shares. Some 31% of the company’s stock is short.

Short interest in Proto Labs rose 8.4% to 1.55 million shares, or 8.2% of the company’s float.

Stratasys saw short interest fall by 7.7% in the last two weeks of April to 4.09 million shares, or about 15% of the company’s float.

Short interest in ExOne rose by 7.3% to 2.22 million shares. About 32.8% of the company’s shares are now held short.

Short interest in half these firms rose, while it fell in the other half. The rise in short interest in Proto Labs is likely the result of a rather tepid earnings report that came out during the final two weeks. The rise in short interest at ExOne could be a bet against the company’s first-quarter earnings results, due out next week.

Both 3D Systems and Stratasys saw declines in short interest in the latter two weeks of April. Even a secondary offering could not slow down 3D Systems’ 25% share price gain since April 15. Stratasys reports first-quarter results next Monday and is expected to post earnings per share of $0.38 on revenues of $98.07 million.

Intel Corp. (NASDAQ: INTC) short interest fell 1% to 233.21 million shares. About 4.7% of Intel’s float is now short.

Advanced Micro Devices Inc. (NYSE: AMD) saw short interest fall by 6% to 96.06 million shares, or 15.9% of the company’s total float.

Qualcomm Inc. (NASDAQ: QCOM) short interest rose by 3.4% to 14.29 million shares, which represents 0.8% of the company’s float.

ARM Holdings PLC (NASDAQ: ARMH) saw a 5.9% rise in short interest to 3.46 million shares, which represents about 0.7% of the firm’s float.

Micron Technology Inc. (NASDAQ: MU) showed a decline of 22.4%% in short interest, to 66.32 million shares, or about 6.5% of Micron’s float.

SanDisk Corp. (NASDAQ: SNDK) saw short interest fall by 16.7% to 7.8 million shares, or 3.2% of the company’s float.

Short interest in Broadcom Corp. (NASDAQ: BRCM) rose by 1.5% to 7.46 million shares. That is 1.5% of the total float.

Marvell Technology Group Ltd. (NASDAQ: MRVL) posted a 2.4% increase in short interest, to 5.6 million shares, or about 1.4% of Marvell’s float.

Nvidia Corp. (NASDAQ: NVDA) short interest rose by 1.8% to 26.52 million shares, about 4.5% of the company’s float.

Texas Instruments Inc. (NASDAQ: TXN) saw short interest decline by 5.9% to 26.5 million shares, or 2.4% of the float.

Applied Materials Inc. (NASDAQ: AMAT) short interest rose by 1.8% to 18.95 million shares, which is about 1.6% of the company’s float.

The Market Vectors Semiconductor ETF (NYSEMKT: SMH) showed a drop of 3.8% in short interest to 9.34 million shares.

Shorts in Texas Instruments got squeezed by the company’s better-than-expected quarterly earnings report and the faint-hearted dropped their positions and likely went looking for a better play.

During the prior two-week period, short sellers added more than 15% to their positions in SanDisk. In the most recent report, more than 16% dropped their short in their short position in the stock. Their timing looks good; SanDisk hit a two-month bottom on May 1 and has been on the rise ever since.

General Electric Co. (NYSE: GE) short interest rose 14% to 94.25 million shares. About 0.9% of GE’s float is now short.

Nokia Corp. (NYSE: NOK) saw short interest fall by 20.8% to 206.34 million shares, about 5.5% of the company’s total float.

Bank of America Corp. (NYSE: BAC) short interest fell 2.1% to 164.26 million shares, which represents 1.5% of the company’s float.

Verizon Communications Inc. (NYSE: VZ) saw a 1.5% rise in short interest to 52.2 million shares, which represents about 1.8% of the firm’s float.

Alpha Natural Resources Inc. (NYSE: ANR) showed a rise of 13.1% in short interest, to 33.02 million shares, about 13.4% of Alpha’s float.

McDonald’s Corp. (NYSE: MCD) showed a drop of 2.8% in short interest, to 11 million shares, about 15.1% of the company’s float.

Apple Inc. (NASDAQ: AAPL) saw short interest rise by 107.2% to 41.59 million shares, or 2.4% of the company’s float.

BlackBerry (NASDAQ: BBRY) saw short interest rise by 0.2% to 164.69 million shares, or 33.3% of the total float.

Microsoft Corp. (NASDAQ: MSFT) posted a 16.3% drop in short interest, to 99.42 million shares, about 1.3% of Microsoft’s float.

Dell Inc. (NASDAQ: DELL) short interest declined by 7.2%, to 22.35 million shares or about 1.5% of the company’s float.

Green Mountain Coffee Roasters Inc. (NASDAQ: GMCR) saw short interest decrease by 2.1% to 31.58 million shares or 26% of the company’s float.

Cisco Systems Inc. (NASDAQ: CSCO) saw short interest rise by 1.2% to 58.7 million shares or about 1.1% of the company’s float.

The most interesting changes in this two-week period are the declines in short interest in Nokia, BlackBerry and Microsoft, as well as the concomitant doubling of short interest in Apple. That is a pretty clear indication that investors are betting that three players in the mobile sector are about to put more pressure on the sector leader.

Short interest in Dell declined for the third period in a row. It will be interesting to see if today’s offer from Carl Icahn and Southeastern Capital Management moves the needle at all. The new offer is certainly not one that cannot be refused.

In the Chinese solar sector we tracked the following short interest changes: JA Solar Holdings Co. Ltd. (NASDAQ: JASO), LDK Solar Co. Inc. (NYSE: LDK), Suntech Power Holdings Co. Ltd. (NYSE: STP), Trina Solar Ltd. (NYSE: TSL) and Yingli Green Energy Holding Co. Ltd. (NYSE: YGE). For China-based firms, the percentage of shares short is not available because the companies are also listed on other exchanges.

Canadian Solar Inc. (NASDAQ: CSIQ) saw short interest drop by 4.8% to 1.92 million shares, about 6.4% of the company’s total float.

First Solar Inc. (NASDAQ: FSLR) short interest rise by 12.2% to 18.43 million shares, which represents 30.6% of the company’s float.

GT Advanced Technologies Inc. (NASDAQ: GTAT) showed a decrease of 5.6% in short interest, to 38.29 million shares, about 32.3% of GT’s float.

MEMC Electronic Materials Inc. (NYSE: WFR) showed an increase of 1.4% in short interest, to 15.62 million shares, about 6.8% of MEMC’s float.

SunPower Corp. (NASDAQ: SPWR) saw short interest jump by 33.1% to 9.15 million shares, 23% of the company’s total float.

JA Solar Holdings Co. Ltd. (NASDAQ: JASO) showed a drop of 16.3% in short interest, to 2.66 million shares.

LDK Solar Co. Inc. (NYSE: LDK) saw short interest rise by 0.8% to 3.44 million shares.

Suntech Power Holdings Co. Ltd. (NYSE: STP) showed a rise of 16.6% in short interest, to 16.6 million shares.

Trina Solar Ltd. (NYSE: TSL) saw short interest decline of 15.6% to 16.15 million shares.

Yingli Green Energy Holding Co. Ltd. (NYSE: YGE) showed a rise of 50.9% in short interest, to 7.53 million shares.

Short interest is piling up in Yingli as the company looks like the next casualty among the Chinese solar energy players. LDK is teetering on the brink of disaster already, having missed a debt repayment last week. The big thing weighing down both these firms is that it appears that China’s central government will not rescue either of them. Both Trina Solar and JA Solar are better capitalized and could muddle through without government assistance.

The sharp increase in short interest in SunPower could rise even more during these two weeks, if the share price continues to rise. The company is tagging along on the boost in First Solar’s share price and there is no fundamental reason for SunPower stock to keep rising. The company is scheduled to report earnings on May 6.

Short interest in 3D Systems rose 2.9% to 27.32 million shares. Some 32.2% of the company’s stock is short.

Short interest in Proto Labs rose 37.8% to 1.43 million shares, or 7.6% of the company’s float.

Stratasys saw short interest rise by 7% in the first two weeks of April to 4.43 million shares, or about 16.2% of the company’s float.

Short interest in ExOne rose by 23.1% to 2.07 million shares. About 32.9% of the company’s shares are now held short.

Short interest in the 3D printing companies continues to rise as the bloom fades. The big question is how quickly the technology will be adopted. Forward earnings multiples are falling back to earth, and that is reflected in the fact that both 3D Systems and ExOne now have about a third of their shares held short.

Proto Labs reported first-quarter results this morning that were above estimates for both earnings and revenues, but the beats were relatively narrow. That likely will only inflame short interest in the company’s stock.

Intel Corp. (NASDAQ: INTC) short interest fell 1.4% to 235.47 million shares. About 4.8% of Intel’s float is now short.

Advanced Micro Devices Inc. (NYSE: AMD) saw short interest rise by 10.6% to 102.23 million shares, or 16.9% of the company’s total float.

Qualcomm Inc. (NASDAQ: QCOM) short interest rose by 1.2% to 13.82 million shares, which represents 0.8% of the company’s float.

ARM Holdings PLC (NASDAQ: ARMH) saw an 8% decline in short interest to 3.27 million shares, which represents about 0.7% of the firm’s float.

Micron Technology Inc. (NASDAQ: MU) showed a rise of 9.9% in short interest, to 85.42 million shares, or about 8.4% of Micron’s float.

SanDisk Corp. (NASDAQ: SNDK) saw short interest rise by 15.5% to 9.36 million shares, or 3.9% of the company’s float.

Short interest in Broadcom Corp. (NASDAQ: BRCM) rose by 6.2% to 7.35 million shares. That is 1.4% of the total float.

Marvell Technology Group Ltd. (NASDAQ: MRVL) posted a 7.7% drop in short interest, to 5.26 million shares, or about 1.2% of Marvell’s float.

Nvidia Corp. (NASDAQ: NVDA) short interest rose by 1.8% to 26.52 million shares, about 4.5% of the company’s float.

Texas Instruments Inc. (NASDAQ: TXN) saw short interest increase by 23.2% to 28.17 million shares, or 2.6% of the float.

Applied Materials Inc. (NASDAQ: AMAT) short interest rose by 25.9% to 18.95 million shares, which is about 1.6% of the company’s float.

The Market Vectors Semiconductor ETF (NYSEMKT: SMH) showed a rise of 6.9% in short interest to 9.71 million shares.

Shorts piled back into Texas Instruments during this period, likely not expecting the stock to post a new high following its earnings report earlier this week.

A better short bet was Applied Materials. The maker of equipment used in chipmaking took a dive last week before recovering most of the loss this week. SanDisk’s swing was even larger in the past two weeks. Short interest in both these stocks should drop in the current two-week period.

The top dividend stocks we are tracking in the short interest are Altria Group Inc. (NYSE: MO), American Electric Power Co. Inc. (NYSE: AEP), Annaly Capital Management Inc. (NYSE: NLY), AT&T Inc. (NYSE: T), Duke Energy Corp. (NYSE: DUK), General Electric Co. (NYSE: GE), Kimberly-Clark Corp. (NYSE: KMB), Kinder Morgan Energy Partners L.P. (NYSE: KMP), Merck & Co. Inc. (NYSE: MRK), Procter & Gamble Co. (NYSE: PG), Reynolds American Inc. (NYSE: RAI) and Verizon Communications Inc. (NYSE: VZ).

As we have said before, it takes much more conviction to short sell a stock that has a very high dividend. On top of having to pay a broker loan-call rate to borrow the stock, the dividend payouts have to be paid and the ex-dividend dates play into the equation as well.

Altria Group Inc. (NYSE: MO) ticked way back up and gave back all the losses in the short interest from the prior report. This was 26.08 million shares as of April 15, up from 23.829 million in the prior report and up from 24.55 million shares short the month before that. This was the highest reading since the end of December. Altria’s dividend yield is now 4.95%.

American Electric Power Co. Inc. (NYSE: AEP) saw short sellers back off into the stock’s strength. This fell to 3.86 million shares in the April 15 short interest. March 28 short interest was down to 4.37 million share,s versus 5.18 million as of mid-March. AEP yields 3.7% as shares have risen and risen.

Annaly Capital Management Inc. (NYSE: NLY) saw a real drop as short sellers wanted to avoid paying that dividend. The April 15 short interest fell to 26.04 million shares, versus 29.85 million shares in the previous period and from 29.37 million shares before that. What is interesting is that the days to cover rose to 3.61 from 2.62 in the prior report. Annaly has a current yield of about 11.49%, based on its last payout.

AT&T Inc. (NYSE: T) saw a slight downtick to 78.29 million shares short as of April 15, versus March 28′s count of 81.68 million shares short. AT&T’s dividend is 4.86% after the earnings drop.

Duke Energy Corp. (NYSE: DUK) saw a significant decline to 6.85 million shares in the short interest from 7.8 million in the prior report. This was the lowest reading since October, and even the days to cover fell to 2.43 from 3.48. Duke has a dividend yield of about 4.1%, as shares are higher from the last report.

General Electric Co. (NYSE: GE) has seen some serious profit taking and new bets come against after earnings, but that was after the short interest date cutoff. The short interest actually did rise ahead of earnings to 82.69 million shares, versus 78.92 million shares in the prior report. The days to cover ticked up a bit to 2.43. GE still outyields the other conglomerates, with a 3.46% yield now that shares have taken such a hit.

Kimberly-Clark Corp. (NYSE: KMB) saw a serious increase in the bets against its massive rise. The stock has hit new high after new high, up until recent days, but the short interest jumped back up to 8.05 million shares from 6.7 million at the end of March. This consumer products giant keeps seeing the shares rise, and the yield is 3.13% now.

Kinder Morgan Energy Partners L.P. (NYSE: KMP) saw its third gain in the short interest as of April 15 to 3.728 million shares (units). The March 28 short interest was 3.357 million shares, versus 2.723 million shares short in mid-March. This is the highest short interest back to last November. Its dividend is actually a distribution and now is the equivalent of about 5.61%.

Merck & Co. Inc. (NYSE: MRK) saw a massive increase in the short interest that is larger than almost all others. This short interest in mid-April went up a whopping 33% to 28.5 million shares. The March 28 short interest was 21.33 million shares, versus 26.18 million shares short in mid-March. Note that this was the highest short interest reading since last August. Merck’s dividend yield is about 3.59% now that shares have appreciated.

Procter & Gamble Co. (NYSE: PG) saw a decent gain in the short interest, meaning that short sellers cleaned up on this week’s price drop. The April 15 short interest was 23.6 million shares, versus 21.329 million shares at the end of March and 24.744 million shares short in mid-March. P&G’s dividend is back up to 3.12%, now that shares sold off after earnings.

Reynolds American Inc. (NYSE: RAI) saw a large gain in the short interest to 10.75 million shares, versus 9.676 million shares at the end of March and a prior near-term high of 10.38 million shares in mid-March. Reynolds has a yield of about 5.13% as shares have remained resilient.

Verizon Communications Inc. (NYSE: VZ) short sellers must have known it was time to step aside into the stock strength. The April 15 short interest fell to 51.423 million shares, versus 57.637 million shares at the end of March and 60.962 million shares short in mid-March. Verizon yields only 3.98% since its shares have hit higher and higher multiyear highs.

General Electric Co. (NYSE: GE) short interest rose 4.8% to 82.7 million shares. About 0.8% of GE’s float is now short.

Nokia Corp. (NYSE: NOK) saw short interest fall by 12.8% to 260.55 million shares, about 7% of the company’s total float.

Bank of America Corp. (NYSE: BAC) short interest rose 7.1% to 167.8 million shares, which represents 1.6% of the company’s float.

Verizon Communications Inc. (NYSE: VZ) saw a 10.8% drop in short interest to 51.42 million shares, which represents about 1.8% of the firm’s float.

Alpha Natural Resources Inc. (NYSE: ANR) showed a rise of 4.8% in short interest, to 29.19 million shares, about 13.4% of Alpha’s float.

McDonald’s Corp. (NYSE: MCD) showed a drop of 2.8% in short interest, to 11 million shares, about 1.1% of the company’s float.

Apple Inc. (NASDAQ: AAPL) saw short interest rise by 0.3% to 20.01 million shares, or 2.1% of the company’s float.

BlackBerry (NASDAQ: BBRY) saw short interest rise by 5.6% to 164.34 million shares, or 33.2% of the total float. Short interest continues to be reported under the company’s previous name, Research in Motion Ltd., but the stock symbol has been changed to BBRY.

Microsoft Corp. (NASDAQ: MSFT) posted a 9.9% rise in short interest, to 118.71 million shares, about 1.6% of Microsoft’s float.

Dell Inc. (NASDAQ: DELL) short interest declined by 18.7%, to 24.09 million shares or about 1.6% of the company’s float.

Green Mountain Coffee Roasters Inc. (NASDAQ: GMCR) saw short interest decrease by 6.3% to 32.25 million shares or 26.5% of the company’s float.

Cisco Systems Inc. (NASDAQ: CSCO) saw short interest rise by 7.7% to 58 million shares or about 1.1% of the company’s float.

Short interest in Dell has declined by double-digit percentages for the past two reports. Competition to the bid from Michael Dell and his partners, once believed to be strong enough to push the stock price higher, had begun to evaporate a few weeks ago and now that one competitive bidder has withdrawn the shares trade once again right around the level of the original take-private bid.

Short interest in Microsoft was rising following reports on weakness in the PC market. The shorts likely will have bailed out by the next short interest report, now that the company has posted solid earnings for the first quarter.

And in the smartphone market, the drop in Nokia’s short interest could indicate that traders see the company getting some benefit from Apple’s perceived woes. BlackBerry, where a third of the shares are now short, has few believers left in its ability to recover.

Short interest in 3D Systems rose 2.3% to 26.55 million shares. Some 31.3% of the company’s stock is short.

Short interest in Proto Labs rose 0.3% to 1.036 million shares, or 5.7% of the company’s float.

Stratasys saw short interest rise by 18% in the final two weeks of March to 4.14 million shares, or about 15.2% of the company’s float.

Short interest in ExOne rose from about 1.54 million on March 15 to 1.68 million shares by the end of the month. Of 7.36 million shares floated, about 22.8% are short.

Once again, short interest in the 3D printing companies is up in this two-week period. The largest rise, in Stratasys shares, likely reflects short sellers’ wariness that the company will meet its guidance. The issue for all these companies is whether they can continue to grow faster than analysts expect. Forward earnings expectations have cooled from previously sky-high levels, but are still above market averages.