Permabear Jeremy Grantham is investing his own money in high-flying tech stocks

A viral social media post revealed that Jeremy Grantham, the legendary investor known as a "permabear," has been putting his own money into high-flying tech companies. The finding surprised many given Grantham's long-standing reputation as a critic of overvalued markets. Market watchers are now speculating about what his personal investment choices signal for his broader market outlook.