NEW YORK, June 21, 2026, 15:03 (EDT)
- Flex is set to enter the S&P 500 before Monday’s open, while Nasdaq’s last regular session was Thursday because U.S. markets were closed Friday for Juneteenth.
- FLEX last closed at $147.61 on June 18, down about 1.4% from the prior Friday’s close, after unusually heavy volume tied to the rebalance window.
- The week ahead turns on index demand and whether investors keep paying up for Flex’s artificial intelligence data-center exposure and planned spin-off.
Flex Ltd. heads into Monday’s session as a new S&P 500 member after a rough, fast week for the stock, which ended the holiday-shortened stretch lower despite a late bounce. FLEX closed Thursday at $147.61, the last regular-session price before the Juneteenth market holiday.
That is the point now. Flex is moving from the S&P MidCap 400 into the S&P 500, the large-company benchmark followed by index funds and portfolio managers, before trading opens June 22. Chief Executive Revathi Advaithi called the move a “landmark milestone,” but the market has already had two weeks to price it. PR Newswire
The stock story is bigger than index membership. Flex is being recast by investors as an artificial intelligence infrastructure supplier, not just a contract manufacturer. The company plans to spin off its cloud and power infrastructure business into a separate listed company by early 2027, creating a unit focused on power, cooling and integrated systems for AI data centers.
The tape was not clean. FLEX fell on Monday, Tuesday and Wednesday, then rose 3.13% on Thursday, when volume jumped to about 80.9 million shares. It still finished below the prior Friday’s $149.71 close, a reminder that inclusion buying does not remove two-way risk.
The broader market helped late in the week. U.S. stocks rallied Thursday, with the S&P 500 up 1.08% and the Nasdaq up 1.91%, as chip shares strengthened and inflation fears eased after a U.S.-Iran peace agreement, Reuters reported. Technology led the S&P sectors, a useful backdrop for Flex, though not a company-specific catalyst.
Flex’s own numbers remain the base of the bull case. In May, the company reported fiscal fourth-quarter net sales of $7.5 billion and fiscal 2026 net sales of $27.9 billion, up 17% and 8%, respectively. It guided fiscal 2027 net sales to $32.3 billion to $33.8 billion and adjusted EPS — earnings per share excluding selected items — to $4.21 to $4.51.
The AI angle is concrete, not just branding. On June 1, Flex introduced power products for high-density AI racks, including a 110 kW power shelf for NVIDIA Vera Rubin NVL72 platforms. Chris Butler, president of embedded and critical power at Flex, said the “rapid growth of AI is driving new demands” on data-center power infrastructure. Flex Investors
Peer read-through is supportive but crowded. Jabil, another electronics manufacturing and data-center infrastructure supplier, raised its 2026 profit forecast last week and lifted its AI-related revenue outlook to about $13.6 billion. CEO Mike Dastoor said “AI infrastructure demand remains extremely strong,” a line that also frames what investors are paying Flex for. Reuters
But the risk is that the stock has run ahead of the next proof point. Once index-related buying is done, FLEX may trade more on execution: whether the spin-off closes on time, whether AI power and cooling demand holds, and whether margins survive competition, supply constraints and macro shocks. Flex itself warned that the spin-off may not be completed on the expected timeline or at all, and that benefits may take longer than expected.
Monday’s open will show how much forced index demand is left. After that, the question gets more basic: can Flex turn a strong index event into another quarter of hard evidence on revenue, margins and the AI infrastructure order book.
