Financial report context:
equity compensation plan information the following table presents the equity securities available for issuance under our equity compensation plans as of december 31 , 2018 . equity compensation plan information 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 ) ) ( a ) ( b ) ( c ) equity compensation plans approved by security holders 399165 $ 0.00 3995600 equity compensation plans not approved by security holders ( 2 ) 2014 2014 2014 .

Financial table:
plan category: equity compensation plans approved by security holders; number of securities to be issued upon exercise of outstanding options warrants and rights ( 1 ) ( a ) ( b ): 399165; weighted-average exercise price of outstanding optionswarrants and rights: $ 0.00; number of securities remaining available for future issuance under equity compensation plans ( excluding securitiesreflected in column ( a ) ) ( c ): 3995600
plan category: equity compensation plans not approved by security holders ( 2 ); number of securities to be issued upon exercise of outstanding options warrants and rights ( 1 ) ( a ) ( b ): 2014; weighted-average exercise price of outstanding optionswarrants and rights: 2014; number of securities remaining available for future issuance under equity compensation plans ( excluding securitiesreflected in column ( a ) ) ( c ): 2014
plan category: total; number of securities to be issued upon exercise of outstanding options warrants and rights ( 1 ) ( a ) ( b ): 399165; weighted-average exercise price of outstanding optionswarrants and rights: $ 0.00; number of securities remaining available for future issuance under equity compensation plans ( excluding securitiesreflected in column ( a ) ) ( c ): 3995600

Additional report context:
( 1 ) includes grants made under the huntington ingalls industries , inc . 2012 long-term incentive stock plan ( the "2012 plan" ) , which was approved by our stockholders on may 2 , 2012 , and the huntington ingalls industries , inc . 2011 long-term incentive stock plan ( the "2011 plan" ) , which was approved by the sole stockholder of hii prior to its spin-off from northrop grumman corporation . of these shares , 27123 were stock rights granted under the 2011 plan . in addition , this number includes 31697 stock rights , 5051 restricted stock rights , and 335293 restricted performance stock rights granted under the 2012 plan , assuming target performance achievement . ( 2 ) there are no awards made under plans not approved by security holders . item 13 . certain relationships and related transactions , and director independence information as to certain relationships and related transactions and director independence will be incorporated herein by reference to the proxy statement for our 2019 annual meeting of stockholders , to be filed within 120 days after the end of the company 2019s fiscal year . item 14 . principal accountant fees and services information as to principal accountant fees and services will be incorporated herein by reference to the proxy statement for our 2019 annual meeting of stockholders , to be filed within 120 days after the end of the company 2019s fiscal year. .

Question: what portion of the equity compensation plan approved by security holders remains available for future issuance?
Answer: 90.9%