Health care stocks were rising, including an almost 0.6% gain for the NYSE Health Care Index while shares of health care companies in the S&P 500 also were up nearly 0.6% as a group. The Nasdaq Biotechnology index was climbing slightly more than 0.3%.

Among health care stocks moving:

(-) bluebird bio (BLUE) slipped 5%. A regulatory filing late Friday showed principal accounting officer Kory Wentworth last week sold 61 shares of his shares through a series of several transactions to cover his tax withholding obligations after a restricted stock award recently vested. The June 5 sales generated just under $15,500 in gross proceeds and pared his equity stake to 6,846 bluebird bio shares.

In other sector news:

(+) Tilray (TLRY) rose over 14% on Monday after the medical marijuana company agreed to a non-binding buyout transaction from its largest institutional investor, Privateer Holdings. Under terms of the proposal, Privateer will distribute all 75 million of its Tilray shares to its investors, who will agree to a two-year lock-up agreement.

(-) Spark Therapeutics (ONCE) slid 7% after the US Federal Trade Commission began a review of Swiss drugmaker Roche’s proposed acquisition of the gene therapy firm, with Roche extending its $114.50 per share tender offer for Spark stock past its scheduled June 14 expiration until July 31.

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