NEW YORK ( TheStreet) -- Even as hoards of blue chips attained 52-week highs this week, a number of stocks are breaking the less desirable boundary of 52-week lows.

AsiaInfo-Linkage ( ASIA), a Beijing-based telecommunications software provider, fell to $15.76, another low for this week. It has a buy rating from Kaufman Brothers and a rating of outperform from Wedbush Securities.

Shares of biopharmaceutical firm AMAG Pharmaceuticals ( AMAG) dipped as low as $23.58 in morning trading Thursday. AMAG was downgraded to neutral from outperform by Robert W. Baird in late July. Citigroup ( C) has had a buy rating on the stock since January.

Asia Info-Linkage and AMAG were repeat losers with Thursday's lows pushing their lower bounds further from depths reached earlier this week.

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China Pharma Holdings ( CPHI), a Chinese biotech firm traded as low as $2.13 Thursday morning. Rodman & Renshaw has a market outperform rating on the stock.

Glass maker Apogee Enterprises ( APOG) traded down to $8.76 Thursday following a disappointing quarterly report. Analysts from Northland Securities rate the stock outperform.

Savings bank HMN Financial ( HMNF) fell to $3.06.

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