RE: THE SP8 Nov 2022 21:15
You seem to be conjuring money out of thin air there.
Money leaves the company to buy back the shares, that reduces the mcap.
E.g. If a cash shell company with mcap of £100m spent £50m buying back shares, it's only got £50m left so it's mcap reduces to £50m. The other £50m has gone to the people who's shares were bought.