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Insider buying can be an encouraging signal for potential investors, especially when markets are near all-time highs. The week's most notable insider buys were at a health insurer, an oil exploration and production company, and a biotech. Some insiders were making return trips to the buy...

Insider buying can be an encouraging signal for potential investors, especially when markets are near all-time highs. Some insiders took advantage of public share offerings in the past week. Biotechs were well represented on this list of last week's insider purchases. Conventional wisdom says...