Capital Stock	9 Months Ended
Mar. 31, 2015
Capital Stock
Capital Stock	C.Capital Stock 2001 Non-Employee Director Stock Plan During the three and nine months ended March 31, 2015, the Company recorded approximately $18,000 and $(19,000) in expense and expense reduction, respectively, related to stock units outstanding under the Company’s 2001 Non-Employee Director Stock Plan, or the 2001 Plan, compared to $2,000 and $(11,000) in expense and expense reduction recorded during the three and nine months ended March 31, 2014. The value of the stock units are classified as a liability and adjusted to market value at each reporting period as the redemption amount of stock units for this plan will be paid in cash. No stock units have been issued under the 2001 Plan subsequent to June 30, 2004. Compensation Policy for Non-Employee Directors On November 12, 2013, the Board amended the Compensation Policy for Non-Employee Directors to make certain changes to the compensation of its non-employee directors, including an increase in the fees paid in cash to the non-employee directors. Under the terms of the amended policy, the redemption amount of deferred share units issued will continue to be paid in shares of common stock of the Company on the date a director ceases to be a member of the Board. Annual retainers vest quarterly over approximately one year from the date of grant, contingent upon the individual remaining a director of ImmunoGen as of each vesting date. The number of deferred share units awarded is now fixed per the plan on the date of the award and is no longer based on the market price of the Company’s common stock on the date of the award. All unvested deferred stock awards will automatically vest immediately prior to the occurrence of a change of control. In addition to the deferred share units, the Non-Employee Directors are now also entitled to receive a fixed number of stock options instead of a fixed grant date fair value of options, determined using the Black-Scholes option pricing model measured on the date of grant, which would be the date of the annual meeting of shareholders. These options vest quarterly over approximately one year from the date of grant. Any new directors will receive a pro-rated award, depending on their date of election to the Board. The directors received a total of 80,000, 80,000 and 41,805 stock options for the nine-month period ended March 31, 2015, and fiscal years 2014 and 2013, respectively, and the related compensation expense for the three and nine months ended March 31, 2015 and 2014 is included in the amounts discussed in the “Stock-Based Compensation” section of footnote A above. During the three and nine months ended March 31, 2015, the Company recorded approximately $93,000 and $329,000 in compensation expense, respectively, related to deferred share units issued and outstanding under the Company’s Compensation Policy for Non-Employee Directors, compared to $118,000 and $315,000 in compensation expense recorded during the three and nine months ended March 31, 2014.

C.Capital Stock

2001 Non-Employee Director Stock Plan

During the three and nine months ended March 31, 2015, the Company recorded approximately $18,000 and $(19,000) in expense and expense reduction, respectively, related to stock units outstanding under the Company’s 2001 Non-Employee Director Stock Plan, or the 2001 Plan, compared to $2,000 and $(11,000) in expense and expense reduction recorded during the three and nine months ended March 31, 2014. The value of the stock units are classified as a liability and adjusted to market value at each reporting period as the redemption amount of stock units for this plan will be paid in cash. No stock units have been issued under the 2001 Plan subsequent to June 30, 2004.

Compensation Policy for Non-Employee Directors

On November 12, 2013, the Board amended the Compensation Policy for Non-Employee Directors to make certain changes to the compensation of its non-employee directors, including an increase in the fees paid in cash to the non-employee directors. Under the terms of the amended policy, the redemption amount of deferred share units issued will continue to be paid in shares of common stock of the Company on the date a director ceases to be a member of the Board. Annual retainers vest quarterly over approximately one year from the date of grant, contingent upon the individual remaining a director of ImmunoGen as of each vesting date. The number of deferred share units awarded is now fixed per the plan on the date of the award and is no longer based on the market price of the Company’s common stock on the date of the award. All unvested deferred stock awards will automatically vest immediately prior to the occurrence of a change of control.

In addition to the deferred share units, the Non-Employee Directors are now also entitled to receive a fixed number of stock options instead of a fixed grant date fair value of options, determined using the Black-Scholes option pricing model measured on the date of grant, which would be the date of the annual meeting of shareholders. These options vest quarterly over approximately one year from the date of grant. Any new directors will receive a pro-rated award, depending on their date of election to the Board. The directors received a total of 80,000, 80,000 and 41,805 stock options for the nine-month period ended March 31, 2015, and fiscal years 2014 and 2013, respectively, and the related compensation expense for the three and nine months ended March 31, 2015 and 2014 is included in the amounts discussed in the “Stock-Based Compensation” section of footnote A above.

During the three and nine months ended March 31, 2015, the Company recorded approximately $93,000 and $329,000 in compensation expense, respectively, related to deferred share units issued and outstanding under the Company’s Compensation Policy for Non-Employee Directors, compared to $118,000 and $315,000 in compensation expense recorded during the three and nine months ended March 31, 2014.