Why Is Twilio (TWLO) Stock Rocketing Higher Today

August 15, 2025 at 13:56 PM EDT

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What Happened?

Shares of cloud communications infrastructure company Twilio (NYSE: TWLO) jumped 6.5% in the afternoon session after the company was added to the S&P MidCap 400 index. S&P Dow Jones Indices announced that the cloud communications provider will join the index effective prior to the opening of trading on Tuesday, August 19. This inclusion is significant as it typically boosts demand for a company's stock from index funds and other institutional investors that track the benchmark. The move follows the completion of UnitedHealth Group's acquisition of Amedisys, the company Twilio is set to replace. The announcement spurred a positive market reaction, reflecting investor enthusiasm and increased confidence in the company's growth trajectory.

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What Is The Market Telling Us

Twilio’s shares are very volatile and have had 22 moves greater than 5% over the last year. In that context, today’s move indicates the market considers this news meaningful but not something that would fundamentally change its perception of the business.

The previous big move we wrote about was 2 days ago when the stock gained 7.9% on the news that the SaaS sector continued to rally as favorable inflation data bolstered hopes for a Federal Reserve interest rate cut. This optimism was largely driven by a benign July Consumer Price Index (CPI) report, which solidified investor expectations for a Federal Reserve interest rate cut. Following the release of the inflation data, which showed a year-over-year increase of 2.7%, the probability of a rate cut in September surged to over 96%. Lower interest rates are typically beneficial for growth-oriented technology stocks, as they can reduce borrowing costs and increase the present value of future earnings. Adding to the positive sentiment was a 90-day delay in the imposition of higher tariffs on Chinese goods, which reduced trade-related uncertainty for the technology sector.

Twilio is down 1.7% since the beginning of the year, and at $107.19 per share, it is trading 27.7% below its 52-week high of $148.35 from January 2025. Investors who bought $1,000 worth of Twilio’s shares 5 years ago would now be looking at an investment worth $432.65.

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Why Is Twilio (TWLO) Stock Rocketing Higher Today

What Happened?

What Is The Market Telling Us

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