However, she emphasized a dip is a buying opportunity as the bubble could continue for much longer. The analyst said the signal could trigger some volatility in the near term. What's more, these bubbles last nearly two years on a median basis. In fact, tech shares enjoy their best gains 16 months after the signal flares. 'The tech sector has entered a bubble, but we believe there is still time to join the hype, not fade it,' strategist Hannah Sheetz wrote to clients Tuesday, following a review of 28 sector bubbles over the last four decades.IXIC YTD mountain Tech in a bubble, Citi says The analyst said tech bubbles usually return 6.4% in addition to the market for the first six months after the signal flashes.

However, Citi thinks the rally can go on for some time. For some, the rally could mean the sector is due for a pullback as a bubble means prices have reached an unsustainable level and can burst. Nvidia, the major beneficiary of generative artificial intelligence, is up more than 200%, as interest grows around the trend. The tech-heavy Nasdaq Composite is nearly 38% higher this year.

The Wall Street firm said tech stocks officially entered a bubble in May after their extraordinary run-up. It's time for investors to join the tech bubble, according to Citi. Personal Loans for 670 Credit Score or Lower Personal Loans for 580 Credit Score or Lower

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