Elon Musk.Allison Robbert/Getty ImagesRecent filings show that Fidelity once again boosted the valuation of its stakes in X and xAI.It was the third month in a row that the valuations of these two Musk companies rose.xAI recently raised $6 billion in new funding, with participation from Fidelity.Fidelity has lifted its valuation of two Elon Musk-controlled tech companies even higher, according to recent filings.This was the third month in a row that the mutual-fund giant raised the value of its stakes in xAI and the social-media platform X, the filings show.The Fidelity Blue Chip Growth Fund valued its xAI shares at $79,857,865 at the end of November, a monthly report posted at the end of December said.