Big Repositioning on Witching Day

This was a sale that was planned ahead of time by the CEO of Moderna. It was not a random sale on the open market. But a few things to take away from this SEC filing. The transaction was planned to happen after the first half of the year during quad witching where repositioning volume is at its peak. This was a very large transaction and the CEO was only disposing shares of Moderna. There were a couple conversions of stock options but thery were sold immediately after conversion. Main point is the CEO did not acquire any more MRNA shares. She is definitely getting some capital together for a repositioning into another investment. She still has millions of MRNA shares as she is the CEO. My question is what is she replacing MRNA shares for? Could she possibly be buying into a better investment than MRNA? She is already wealthy so is she just cashing out a little chunk of her fortune? This is definintely an interesting and very big SEC filing.