Since Becton recently released fiscal first-quarter results marred by a slight revenue shortfall, however, some investors have decided it was time to jump off.

FORBES: Becton Selloff Is A Buying Opportunity

The health insurance and managed-care provider is still up 72.5% in the past 12 months, and the gurus decided it was time to jump off of the train and lock in profits, especially since the Medicare Modernization Act, which takes effect next year, could put a crimp in the growth in premiums that health insurance providers can charge.

FORBES: Gurus Buy Biotech And Software, Sell Health Care

This caused a noticeable (and duly noticed) one-off jump in the fraction of jobs defined as part-time (see chart).

ECONOMIST: No part-time job explosion