DENVER (

TheStreet

) --

Chipotle Mexican Grill

(CMG) - Get Report

shares tumbled Friday morning following broker action on the stock.

Analysts from Morgan Stanley issued a downgrade on Chipotle shares to equal weight, from overweight.

That led Chipotle shares 4.3% lower in morning trading.

>> 10 Restaurant Stock Winners of 2010

Chipotle appeared on

TheStreet

's roundup of the

best-performing restaurant stocks of 2010. The fast-casual restaurant chain has seen its share price soar nearly 200% so far this year.

Elsewhere in restaurant sector broker action Friday morning, Raymond James analyst Bryan C. Elliott issued an upgrade on shares of

Buffalo Wild Wings

(BWLD)

to strong buy from market perform, and raised his price target to $53, citing the stock's " valuation discount to peers."

"BWLD shares have significantly underperformed our broader restaurant universe over the past six weeks, which has created a significant valuation gap to its 'still growing' peer group," the analyst noted.

Buffalo Wild shares jumped 2.5% to $47.42 in morning trading.

>> Restaurant Stocks: Earnings to Watch

On Thursday

Starbucks was also the focus of broker action. Analysts at Bank of America/Merrill Lynch maintained a neutral rating on the coffee shop chain but raised their price target on the stock to $35.

>> Peet's Could Benefit from Starbucks-Kraft Split

Earlier this week analysts from Argus Research reiterated a buy rating on Starbucks and upped their price target by $1 to $39. McAdams Wright Ragen analysts reiterated a buy rating and raised their price target by $5 to $36.

UBS also reiterated a buy rating on Starbucks, hiking its price target from $29 to $33 over the last two months.

Starbucks shares fell 1.3% Friday morning.

-- Written by Miriam Marcus Reimer in New York.

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