Index funds must buy Twilio by Tuesday. Insiders spent a year selling it.
S&P 500 funds have to own TWLO before the open on Oct. 6, into a stock that closed $51 above the consensus analyst target. Insiders sold $610.3 million of it in 12 months without buying a share.
Vincent Jiang · 3 min read
The seat opens Tuesday
S&P Dow Jones Indices named Twilio to the S&P 500 after Thursday's close, effective before the open on Tuesday, Oct. 6. The cloud communications company replaces Warner Bros. Discovery, which exits as Paramount Skydance's acquisition of it nears completion 1. Twilio traded as high as $305.95 on Thursday, near a five-year high 2.
Holders get four sessions, and the choice is binary: stand in front of a bid that has to happen, or sell into it.
A bid with a deadline
Inclusion obliges every fund tracking the benchmark to own the stock by Tuesday's open, which is why the shares added 1.6 percent in extended trading on the news 5. Twilio, an S&P MidCap 400 member only since August 2025 6, arrives with a $46.26 billion market cap 3. It closed Oct. 1 at $301.27 4.
The sellers inside the building
The forced buyer arrives while the voluntary ones leave. Insiders sold 515,852 shares for $126.9 million over the past 90 days 3. Director Andrew Stafman accounted for most of it: 500,000 shares at $247.08 on Aug. 12, an 80.65 percent cut to his position 3. Over 12 months, a second count puts insider sales at $610.3 million, with zero insider buying 4. The CFO's far smaller sale covered tax withholding on vested awards 3.
Every target sits below the price
The street never caught up with the rally. The consensus target across 28 analysts is $250.39, about $51 under the close 3. HSBC went further, cutting the stock to Reduce at $211 last week: the 30 percent gain since Meta launched Muse on Sept. 8 treats Twilio as the communications rails for Meta's consumer AI agents, while Meta's own voice technology may keep much of that revenue in house 2.
Twilio closed above every published target on the street
Data
| Value | |
|---|---|
| HSBC target | $211 |
| Consensus, 28 analysts | $250.39 |
| TD Cowen target | $300 |
| TWLO close, Oct. 1 | $301.27 |
The whole move is one year old. The 52-week range runs $99.23 to $304.75 4, and the close values Twilio at about 42 times trailing earnings 3.
The growth arrived before the Muse story did
The bull case has receipts. Second-quarter revenue, reported Aug. 6, was $1.50 billion, up 22 percent, and earnings of $1.47 beat the $1.32 consensus 3. The acceleration also predates Muse: growth ran near 4 percent in early 2024 and has climbed almost every quarter since 8. Twilio finished 2025 with $5.07 billion of revenue and $158 million of operating income 7.
Growth quadrupled in two years, and the climb started before Muse
Data
| Revenue growth, YoY | |
|---|---|
| Q3 '23 | 5.2% |
| Q4 '23 | 5% |
| Q1 '24 | 4% |
| Q2 '24 | 4.3% |
| Q3 '24 | 9.7% |
| Q4 '24 | 11% |
| Q1 '25 | 12% |
| Q2 '25 | 13.5% |
| Q3 '25 | 14.7% |
| Q4 '25 | 14.3% |
| Q1 '26 | 20% |
| Q2 '26 | 22% |
What the multiple pays for is not that slope but AI-agent traffic not yet booked, on 5.6 percent operating margins in the June quarter 8.
Tuesday settles the flow question
The same reshuffle pushes FormFactor into Twilio's vacated MidCap 400 seat, with Workiva behind it 1. Then the index trade prints and the mandatory bid is spent. What remains is a stock priced above every published target, resting on a revenue stream HSBC says Meta can claw back 23. After Tuesday, every bid for Twilio is voluntary.
Deepdive
AI-generated from this story and its cited sources. Not investment advice.
