For a FTSE 100 stock to jump 40% in a single month, something pretty significant must have happened. So it’s no surprise that the Anglo American (LSE:AAL) share price spike caught a lot of investors’ attention. Here’s what happened with the best performing FTSE 100 stock in April. The main surge came in late April when news broke that BHP Group had offered a £31.1bn all-share takeover proposal for the firm. There are a lot of synergies between the two companies, most notably in the copper mining space. Further, the Anglo American share price likely looked cheap to BHP Group, given the falling share price over the past year. Usually with takeover bids, the share price will quickly jump to the level implied by the offer price. In this proposal, existing shareholders would receive a total value of £25.08 per Anglo American share. Not only this, but they would also receive extra value as part of the deal. This means that owning the stock now would be worth well above £25.08. Naturally, the share price jumped from around £22 before the announcement to just under £27. It’s hard to pin an exact fair value on the stock based on the...