Biogen Idec Inc. (Nasdaq: BIIB) shares climbed 7% to $78.44. Volume for the stock was 4.9 million, trumping its daily average of 1.8 million, after the biotechnology company said its experimental multiple-sclerosis drug showed promising results in two late-stage studies.

Intel Corp. (Nasdaq: INTC) was a busy company Monday, trading in 31.7 million shares, still short of its daily average of 59.8 million. Share prices for the chips-maker nipped up 0.3% to $20.07, after the company said its new processor for tablets is now available, as it tries to break into the fast-growing mobile market dominated by designs based on rival ARM Holdings PLC’s architecture.

3D Systems Corporation (Nasdaq: TDSC) took a 10.5% tumble in price Monday afternoon to $50.60, on volume of 1.2 million shares, far above its daily average of 247,000.