BOSTON (TheStreet) -- Nokia(NOK) - Get Report and Time Warner (TWX) had the largest increases in short interest, according to data from the New York Stock Exchange, even as investors turned less bearish.

Short interest, which measures all uncovered short positions in securities, fell during the second half of February, according to the NYSE. Short positions are bets that a stock will fall, where investors borrow shares and sell them at a higher price, hoping to buy the stock back at a lower price to profit on the difference.

According to the NYSE, overall short interest fell to 12.6 billion shares through Feb. 28, down more than 1% from 12.8 billion shares on Feb. 15. During that same period, the

S&P 500

fell less than 0.1%. The markets have taken a turn for the worse since as oil and commodity prices continue to soar. Since March 1, the S&P 500 has dropped nearly 2%, including Thursday's 17-point decline, while oil has topped $100 a barrel.

Several equities listed on the NYSE had rapid increases in short interest during the last half of February, some by as much as 50%. Short interest is one indicator that long investors in these stocks could be in for painful declines.

Nokia, for instance, saw short interest balloon to nearly 100 million positions, putting it in the top 5 NYSE stocks with the largest current short positions, which routinely includes


(C) - Get Report


Ford Motor

(F) - Get Report


Sprint Nextel

(S) - Get Report


The following is a list of

10 stocks that saw the largest percentage increases in short interest

from Feb. 15 through Feb. 28, ranked in reverse order. This data was pulled from the NYSE and NYSE Arca's top 100 positions, which is released on a bi-monthly basis.

D.R. Horton

(DHI) - Get Report

Company Profile

: D.R. Horton constructs and sells homes in U.S. Through the company's financial services operations, it also provides mortgage financing and title agency services.

Short Interest Change

: Short interest in D.R. Horton climbed 8.4% to almost 29 million positions as of Feb. 28. Not surprising, the stock is down 3.4% in the last month. D.R. Horton shares were hit hardest on Feb. 22 after the S&P Case-Shiller 20-city index -- a key read on the housing sector -- fell 2.4% from a year ago.

PMI Group

( PMI)

Company Profile

: PMI Group provides residential mortgage insurance products.

Short Interest Change

: Short interest in PMI Group climbed 8.9% to 28.5 million positions as of Feb. 28. PMI Group shares have steadily dropped 12% since Feb. 15, the date of the last short interest report, after the mortgage insurer posted a fourth-quarter loss of $184.4 million, or $1.14 a share, as revenue plunged 41% from a year ago to $144.3 million.

General Motors

(GM) - Get Report

Company Profile

: GM is the world's second-largest automaker, which emerged from Chapter 11 bankruptcy and completed the world's biggest initial public offering in November.

Short Interest Change

: Short interest in GM rose 10.8% to 28.8 million positions as of Feb. 28. While the automaker was a high flying

IPO pick for hedge fund managers

, the stock actually now trades below its IPO price.

U.S. Steel

(X) - Get Report

Company Profile

: U.S. Steel is an integrated steel producer of flat-rolled and tubular products with major production operations in North America and Europe.

Short Interest Change

: Short interest in U.S. Steel rose 12.4% to 25.4 million positions as of Feb. 28. U.S. Steel shares were buoyed by an

upgrade from Goldman Sachs analysts

, who said the company will take advantage of rising steel prices. After a temporary bump in share price, though, U.S. Steel shares are down nearly 15%.

Exxon Mobil

(XOM) - Get Report

Company Profile

: Exxon Mobil is engaged in the exploration, production, transportation and sale of crude oil and natural gas and the manufacture, transportation and sale of petroleum products.

Short Interest Change

: Short interest in Exxon Mobil rose 12.5% to 33.4 million positions as of Feb. 28. As the price of oil has spiked, so have shares of Exxon, gaining more than 10% from the beginning of the Egyptian protests through a recent peak on Feb. 23 amid the crisis in Libya. Since Feb. 16, though, the stock has slipped 1.6%, which may be an indication that traders are booking quick profits in the oil giant.

Chimera Investment

(CIM) - Get Report

Company Profile

: Chimera Investment is a specialty finance company that invests in residential mortgage backed securities, or RMBS, residential mortgage loans, real estate-related securities and various other asset classes.

Short Interest Change

: Short interest in Chimera was up 13.1% to 41 million positions as of Feb. 28. Unlike a majority of the stocks on this list, Chimera shares are up since Feb. 15. Investors are likely lured to the REIT thanks to its attractive 16% dividend yield.

AMR Corp.


Company Profile

: AMR Corp. is the parent of American Airlines, which provides scheduled jet service to approximately 160 destinations.

Short Interest Change

: Short interest in AMR rose 18.9% to 47.2 million positions as of Feb. 28. It's not surprising that as oil prices have held above $100 a barrel, airline stocks have crumbled and

fees have ballooned

. After crude surged above $100 on Feb. 18, AMR shares have fallen nearly 15%.


(HCP) - Get Report

Company Profile

: HCP is a self-administered, real estate investment trust, which acquires, develops, leases, manages and disposes of healthcare real estate and provides financing to healthcare providers.

Short Interest Change

: Short interest in HCP rose 22.8% to 23.4 million positions as of Feb. 28. Since Feb. 15, the date of the NYSE's last short interest report, HCP shares are flat. On Feb. 15, HCP said its fourth-quarter results doubled from a year ago, coming in ahead of Wall Street's expectations.


(NOK) - Get Report

Company Profile

: Nokia manufactures mobile devices that offer Internet services, music, maps, media, messaging and games.

Short Interest Change

: Short interest in Nokia soared 50.5% to 98.6 million positions as of Feb. 28. Nokia shares have plunged more than 20% in the last month, even after news came that


(MSFT) - Get Report

would pay the handset maker billions of dollars after Nokia agreed to adopt

Windows Phone 7


Time Warner


Company Profile

: Time Warner is a media and entertainment company, operating cable television networks, film studios and publishing units. Subsidiaries include Time Magazine, HBO, Warner Bros., CNN, Turner Broadcasting and New Line Cinema.

Short Interest Change

: Short interest in Time Warner surged 54.3% to 24.4 million positions as of Feb. 28. The rapid increase in short interest isn't completely surprising as Time Warner shares surged more than 20% in the month of February. On Feb. 2, the media company's

fourth-quarter earnings

came in ahead of analysts' estimates, spurring the rally in the stock.

-- Written by Robert Holmes in Boston


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