The "massive" 29% decline in shares of eHealth since August 8 has presented a "significant opportunity" for growth investors to build positions, SunTrust analyst Tobey Sommer told investors earlier in a research note. The analyst, who calls eHealth his favorite idea, believes the company has room to grow from a $2B market capitalization today to greater than $10B over the next four years. He expects eHealth shares to rise in the near year as its "unique consumer-centric model" wins Medicare market share. Talks with management indicates the company's fundamentals are "robust," says Sommer, who kept a Buy rating on the shares with a $150 price target. The stock in late morning is up 5%, or $4.35, to $84.30.