My friendly neighbourhood bot suggests that, looking at actual money transactions rather than press releases, values for those three firms might be:
SpaceX $200bn


Your bot seems to be suffering from Musk Derangement Syndrome, if it thinks SpaceX is only worth $200b. Just based on earnings, which are estimated to be $8b in 2025 on $15-16b in revenues, with revenues and presumabl earnings expected to increase to $22-24b in 2026, a reasonable conjecture would be that earnings will reach $12b this year. At 50% growth and with a huge technological lead in space delivery, the idea that the company might be worth 18x earnings seems crazy. Recent insider share sales are at a valuation of about $800b, and most analysts expect an IPO this year at somewhere between $1-1.5t. That seems a little steep to me, but $200b?

Still your point is well taken, even at $1.5t, their 7% SpaceX stake would only be worth $105b, less than 3% of Alphabet's market cap.