Health stocks ended Friday on a generally upbeat note. The Nasdaq biotechnology index closed up 1.3%, and the Amex pharma index finished up 0.6% at 305.34.

Genentech ( DNA) rose 1.4% to $96 Friday following a late-Thursday announcement that the biotech company has formed a team to assess Roche's $89-a-share buyout bid. Genentech stated it's not obligated to agree to a deal with its majority shareholder.

A number of Wall Street upgrades and positive notes sent several stocks in the sector higher.

BioMarin Pharmaceutical ( BMRN - Get Report) rose 1.9% to $31.49 on a UBS upgrade to buy from neutral.

BioSphere Medical ( BSMD) rose 2.2% to $3.65 on an upgrade by Piper Jaffray from neutral to buy.

Shares of medical equipment company RTI Biologics ( RTIX - Get Report) rose 5.3% to $8.41 on an upgrade by Roth Capital from hold to buy.

And Alexion Pharmaceuticals ( ALXN - Get Report) climbed 6.1% to $80.98 after Collins Stewart initiated coverage of the stock with a buy rating.

This article was written by a staff member of