Beyond Meat (BYND) - Get Report  apparently is beyond Wall Street analysts' perspective of what is reasonably valued, though not necessarily investors.

Shares of Beyond Meat jumped more than 14% on Wednesday after Canadian coffee chain Tim Hortons said it was now offering faux-meat breakfast sandwiches made with beyond Meat products at almost 4,000 locations. Tim Hortons is a subsidiary of Restaurant Brands International (QSR) - Get Report .

The news offset a second analyst downgrade in as many days, this time from Sanford Bernstein, who lowered their rating on the stock to market perform from outperform on "valuation considerations."

In a note to clients, Sanford Bernstein analyst Alexia Howard said she is downgrading the company and lowering her target price to $123 "as the stock has traded in a highly volatile manner since its IPO likely due to its limited public float." 

Shares of Beyond Meat gained 13.9%, or $17.53, rising to $143.56 in afternoon trading on the Nasdaq Stock Market. The plunged more than 25% on Tuesday.

She added that the shares are now trading at more than 31 times enterprise-to-value sales relative to its potential sales, "implying limited upside potential from a valuation perspective."

The downgrade follows a similar note from JPMorgan on Tuesday that sent Beyond Meat shares into a tailspin, prompting the stock to post its biggest one-day decline since listing on the Nasdaq last month.

Indeed, Wall Street analysts are now lining up to express their concern over Beyond Meat's beyond realistic $10 billion valuation.

Still, Howard noted that despite the valuation concerns, "... we continue to expect significant growth potential in the plant-based meat category and believe that Beyond Meat is well positioned as one of the front-runners leading the new wave of plant-based meat products."

She also pointed to the ongoing wwine fever epidemic in China that continues to have an impact on hog and pork supplies and prices as a potential boon for Beyond Meat.

"This could happen more quickly than expected if meat prices are driven upwards globally due to the African Swine Flu epidemic in China," the analyst said.

Norman Levine, a managing director and portfolio manager with Toronto-based asset management firm Portfolio Management Corp., is more onside with analysts' valuation perspective, particularly given competition isn't likely very far behind.

"We will the bigger brands come up with the same or similar product in the future," says Levine. "This is food science, not rocket science. I would say that, if you are looking to invest in a company like Beyond Meat, you are there for a good time, and not a long time."

Taste Test: Our Reporters Try the Beyond Meat Burger, Talk Business Model