Mr Cooper Group Inc (COOP)

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If you are just referring to WAMUQ legacy commons
First R/S was times 0.03
Second R/S was /12

So if you had 1 million WAMUQ legacy common shares :

After first R/S during the 2012 reorg = 1,000,000 * 0.03 = 30,000 shares


After second R/S = 30,000 / 12 = 2,500 shares

Now for the bigger picture, only 1.19 Billion commons released in 2012. You multiply that with 0.03 you get 36 million shares for commons
Sadly the 2 reverse splits do reduce the share count and also the $$ value drastically .