The Holders may exercise the registration rights granted hereunder in such manner and proportions as they shall agree among themselves. The registration rights hereunder shall cease to apply to any particular Registrable Security when: (a) a registration statement with respect to the sale of such Registrable Security shall have become effective under the Securities Act and such Registrable Security shall have been disposed of in accordance with such registration statement; (b) such Registrable Security shall have been sold to the public pursuant to Rule 144 under the Securities Act (or any successor provision); (c) such Registrable Security shall have been otherwise transferred, new certificates for them not bearing a legend restricting further transfer shall have been delivered by Parent and subsequent public distribution of them shall not require registration or qualification of them under the Securities Act or any similar state law then in force; (d) such Registrable Security shall have ceased to be outstanding, (e) in the case of Registrable Securities held by a Holder that is not Impala or any Affiliate thereof, such Holder holds less than five percent (5%) of the then-outstanding Registrable Securities and such Registrable Securities are eligible for sale pursuant to Rule 144 under the Securities Act (or any successor provision) without restriction (including with respect to manner of sale and volume limitations) or (f) in the case of Registrable Securities held by Impala or any Affiliate thereof, such Holder holds less than three percent (3%) of the then-outstanding Registrable Securities and such Registrable Securities are eligible for sale pursuant to Rule 144 under the Securities Act (or any successor provision) without restriction (including with respect to manner of sale and volume limitations). Parent shall promptly upon the request of any Holder furnish to such Holder evidence of the number of Registrable Securities then outstanding.