Chancellor Chandler issued his ruling yesterday upholding the poison pill Airgas, Inc.’s board of directors adopted in response to Air Products and Chemicals, Inc.’s $5.8 billion hostile takeover ($70/share, all cash). Chancellor Chandler determined that the Airgas board of directors “acted in good faith and in the honest belief that the Air Products offer, at $70 per share, is inadequate.”  (PDF of the case here, thanks to Francis G.X. Pileggi.)

One reason this decision bugs me is that I suspect a good number of people who don’t like insider trading restrictions would be supportive of this decision.  To me, it’s the same question:  What does the shareholder want for his or her shares?  Period.  

For some who don’t like insider trading restrictions, they argue that, at least in non-face-to-face insider trading transactions, the sharedholder did not suffer harm. (See, e.g., Henry Manne.) Sharedholders were offered a price they deemed acceptable, and sold.  Who cares who was on the other side of the transaction?  I find parts of this rationale compelling, although I also find the property rights concerns related to insider trading even more compelling. (See, e.g., Professor Bainbridge.)

For me, the anti-insider-trading rationale…