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DexCom

(DXCM) - Get DexCom, Inc. Report

plummeted Tuesday as the San Diego-based company, a maker of glucose-monitoring systems for diabetics, was downgraded by Cowen & Co. to neutral from outperform.

Analysts said their checks with physicians and patients "do suggest that reimbursement will be critical for the near-term acceptance and long-term market development for continuous glucose monitors due to the high relative cost of use in the current generation of products." DexCom dropped $2.55, or 15.2%, to $14.28 in recent trading.

McData

( MCDTA) advanced after the Broomfield, Colo., storage-gear maker was upgraded by JMP Securities to market-outperform from market-perform.

Shares gained 16 cents, or 4.1%, to $4.09.

Ivow's

(IVOW)

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shares were dropping after the company, a provider of services for treating chronic and morbid obesity, reported the results of its offer to exchange some of its warrants.

The company said holders traded warrants to purchase 739,726 shares at an exercise price of $3 a share for new warrants to buy the same amount of stock at $1.40 a share. Holders also tendered warrants for 62,695 shares with an exercise price of $3.18 each in exchange for warrants to purchase the same number of shares at an exercise of $1.40 a share. Additionally, warrants for 46,503 shares at $9.50 each were changed for warrants to buy stock at an exercise price of $2.50 a share.

Ivow lost 43 cents, or 15.5%, to $2.35.

Monterey Gourmet Foods

( PSTA) agreed to sell institutional investors about 2.17 million shares at a price of $5.75 each. Gross proceeds will be around $12.5 million.

Investors will also get warrants to buy around 652,000 additional shares at an exercise price of $7.50 each. The warrants will remain exercisable for five years. Shares of the foodmaker were falling 72 cents, or 11.2%, to $5.72.

VendingData

(VNX)

said it received a purchase order for an additional nine Deck Checkers from the Sands Macao Casino in China. The Deck Checkers will be delivered and installed this month.

Sands Macao has been operating with one Deck Checker in place for more than 10 months. The Deck Checker is a device that scans playing cards and checks to ensure an accurate count and verify that all of the cards are present. Shares of VendingData rose 15 cents, or 6.8%, to $2.34.