Today SGR is worth the current shares outstanding x the share price, not the fully diluted number.
SGR - 266,606,358 x 4.08 = $1,087,753,941
LSG - 317,815,793 x 4.06 = $1,290,332,120
RMX - 212,127,214 x 4.71 = $999,119,178
This is what the index measures.