March 22, 2016: Here are four stocks trading with relatively heavy volume among 21 equities making new 52-week lows in Tuesday’s session.

AstraZeneca PLC (NYSE: AZN) dropped about 2.5% on Tuesday to post a new 52-week low at $27.68 after closing at $28.40 on Monday. The stock’s 52-week high is $36.69. Share volume of about 6.3 million was 30% higher than the daily average of around 4.8 million shares traded. The company’s stock was downgraded from Buy to Hold this morning at Jefferies.

Pepco Holdings Inc. (NYSE: POM) fell by about 3.3% on Tuesday to post a new 52-week low of $21.25 against a high of $27.34. The stock closed at $21.97 on Monday night. Volume rose to around 6.3 million shares, about 40% higher than the daily average of around 3.6 million shares traded. The utility company had no news on Tuesday.

Synergy Pharmaceuticals Inc. (NASDAQ: SGYP) posted a new 52-week low on Tuesday. Shares traded at a low of $2.60, down about 6.8%, after closing at $2.79 on Monday. The stock’s 52-week high is $10.15. Volume approached double the daily average of around 2.3 million shares. The company also had no specific news Tuesday.

Vivint Solar Inc. (NYSE: VSLR) dropped about 3% on Tuesday to post a new 52-week low of $3.26 against a 52-week high of $16.00. The stock closed at $3.36 on Monday night. Volume totaled about 2.7 million shares compared with the stock’s daily average volume of around 644,000. The solar installer announced this morning that it had closed a $200 million term credit facility.