Director Networks and Firm Value

Are the professional networks of corporate directors valuable? More connected directors may have better information and more influence, which can increase firm value. However, these directors may also be busy or spread value-decreasing practices. To separate the effect of director networks on firm value from the effect of other value-relevant director attributes, we use the unexpected deaths of directors as a shock to the director networks of interlocked directors. By studying the announcement returns and using a difference-in-differences methodology, we find that this negative shock to director networks reduces firm value. This evidence suggests that director networks are valuable.