The biggest comparitive picture possible
SUM listed on 1 November 2011. The IPO price was $1.40. At the closing price on Friday 17 August 2018 the shares closed at $7.50 5.35 times your money plus dividends in 6.75 years.
RYM closed at $2.71 on 31 October 2011. At the closing price of $13.35 investors have made 4.93 times their money plus dividends in the same timeframe. RYM reported underlying profit of $84m for the year ended 31 March 2012 which is 16.8 cps so as at 1 November 2011 they were trading at $2.71 / 0.168 = 16.13 times forward earnings approximately where SUM presently trades on a forward earnings basis.
If RYM grows underlying profit 17% this year to $238m their underlying EPS will be 238/500m = 47.6 cps. At $13.35 this puts them on a forward PE of 28 times.
If SUM can make $107.5m this year on 224.8m shares issued = 47.8 cps, ostensibly the same eps as RYM. At $7.50 this places them on a forward PE of 15.7.