part a0iii item a010 . directors , executive officers and corporate governance for the information required by this item a010 with respect to our executive officers , see part a0i , item 1 . of this report . for the other information required by this item a010 , see 201celection of directors , 201d 201cnominees for election to the board of directors , 201d 201ccorporate governance 201d and 201csection a016 ( a ) beneficial ownership reporting compliance , 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . the proxy statement for our 2019 annual meeting will be filed within 120 a0days after the end of the fiscal year covered by this annual report on form 10-k . item a011 . executive compensation for the information required by this item a011 , see 201ccompensation discussion and analysis , 201d 201ccompensation committee report , 201d and 201cexecutive compensation 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . item a012 . security ownership of certain beneficial owners and management and related stockholder matters for the information required by this item a012 with respect to beneficial ownership of our common stock , see 201csecurity ownership of certain beneficial owners and management 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . the following table sets forth certain information as of december a031 , 2018 regarding our equity plans : plan category number of securities to be issued upon exercise of outstanding options , warrants and rights ( 1 ) weighted-average exercise price of outstanding options , warrants and rights number of securities remaining available for future issuance under equity compensation plans ( excluding securities reflected in column ( a ) ( b ) ( c ) equity compensation plans approved by security holders 1471449 $ 136.62 3578241 ( 1 ) the number of securities in column ( a ) include 22290 shares of common stock underlying performance stock units if maximum performance levels are achieved ; the actual number of shares , if any , to be issued with respect to the performance stock units will be based on performance with respect to specified financial and relative stock price measures . item a013 . certain relationships and related transactions , and director independence for the information required by this item a013 , see 201ccertain transactions 201d and 201ccorporate governance 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . item a014 . principal accounting fees and services for the information required by this item a014 , see 201caudit and non-audit fees 201d and 201caudit committee pre-approval procedures 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference. .
what percentage of securities to be issued upon exercise are shares of common stock underlying performance stock units if maximum performance levels are achieved?
part a0iii item a010 . directors , executive officers and corporate governance for the information required by this item a010 with respect to our executive officers , see part a0i , item 1 . of this report . for the other information required by this item a010 , see 201celection of directors , 201d 201cnominees for election to the board of directors , 201d 201ccorporate governance 201d and 201csection a016 ( a ) beneficial ownership reporting compliance , 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . the proxy statement for our 2019 annual meeting will be filed within 120 a0days after the end of the fiscal year covered by this annual report on form 10-k . item a011 . executive compensation for the information required by this item a011 , see 201ccompensation discussion and analysis , 201d 201ccompensation committee report , 201d and 201cexecutive compensation 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . item a012 . security ownership of certain beneficial owners and management and related stockholder matters for the information required by this item a012 with respect to beneficial ownership of our common stock , see 201csecurity ownership of certain beneficial owners and management 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . the following table sets forth certain information as of december a031 , 2018 regarding our equity plans : plan category number of securities to be issued upon exercise of outstanding options , warrants and rights ( 1 ) weighted-average exercise price of outstanding options , warrants and rights number of securities remaining available for future issuance under equity compensation plans ( excluding securities reflected in column ( a ) ( b ) ( c ) equity compensation plans approved by security holders 1471449 $ 136.62 3578241 ( 1 ) the number of securities in column ( a ) include 22290 shares of common stock underlying performance stock units if maximum performance levels are achieved ; the actual number of shares , if any , to be issued with respect to the performance stock units will be based on performance with respect to specified financial and relative stock price measures . item a013 . certain relationships and related transactions , and director independence for the information required by this item a013 , see 201ccertain transactions 201d and 201ccorporate governance 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference . item a014 . principal accounting fees and services for the information required by this item a014 , see 201caudit and non-audit fees 201d and 201caudit committee pre-approval procedures 201d in the proxy statement for our 2019 annual meeting , which information is incorporated herein by reference. .