Bandwidth spent the first half of 2026 taking convertible debt off its balance sheet and buying back its own shares, and on July 29 it raised its full-year outlook. The stock fell 29.3% that session, from $52.25 to $36.95 on four and a half million shares against roughly a million on a typical day.

The Raleigh, North Carolina company sells voice, messaging and session initiation protocol trunking over a network it owns, mostly to US enterprises, carriers and contact centers. What is at stake is not solvency — the balance sheet has rarely looked better — but whether the roughly two-thirds discount at which Bandwidth trades to Twilio, the San Francisco developer platform that is the largest cloud-communications vendor by share, is a dislocation or an accurate read of what happens to reported growth next year.

The deleveraging nobody paid for

The 0.25% convertible notes due 2026 matured on March 1 with the last $8m settled in cash. Bandwidth then repurchased roughly $100m of principal of its 0.50% notes due 2028 for about $92m in March, and about $122m more for roughly $116m in June, cutting that issue from $250m to some $28m outstanding. The funding came from $275m of zero-coupon converts due July 2032, priced June 16 at a conversion price near $72.64, a 37.5% premium to the prior close, with about $19m spent on capped calls to blunt conversion dilution. Under a repurchase authorization of $80m the company bought 576,794 shares at an average $34.67 in the six months to June 30. Chief financial officer Daryl Raiford described the program in March as "an accelerated de-levering campaign by repurchasing convertible debt at an attractive discount."

Capital spending on the owned network is guided to $24–26m, under 3% of revenue, and trailing free cash flow runs near $72m against a market value of $1.82bn.

What the sellers were looking at

Second-quarter revenue rose 22.2% to $219.9m while gross profit rose 9.6% to $78.5m, gross margin falling to 35.7% from 39.8%. About $68m of that top line — roughly 31% — is messaging surcharges collected from customers and remitted to US carriers, booked at no margin. Strip them out and cloud communications revenue was $152m, up 12%. Adjusted EBITDA still rose 27% to $28m, a record 18% margin struck on that smaller base, and guidance went up to $900–910m of revenue for the year. "We are capitalizing on this shift to secure larger strategic customer wins across AI-native innovators, Global 2000 enterprises, and hyperscalers," chief executive David Morken said on July 29. Political campaign revenue for the year was trimmed to $13m from $15m.

Two familiar worries die in the filings. No individual customer exceeded 10% of revenue or of receivables in the March quarter, per the 10-Q, so there is no reseller cliff. And the dilution at work — diluted shares up 11.2% year on year to 33.2m — comes from stock compensation, not the converts.

Twilio earns its line

Twilio's June quarter grew 22.0% to $1,499.1m with gross profit up 20.4%, dollar-based net expansion at 116% against roughly 108% a year earlier, and free cash flow up 34% to $353m. Its diluted share count was 159.7m in both periods: the buyback, $66.0m in the quarter with $826m of authorization left, is absorbing stock compensation rather than shrinking the base. Twilio trades at 15.6x trailing and 14.5x forward gross profit, and 46.9x forward earnings; Bandwidth at 5.9x and 5.4x, and 32.4x forward earnings. Trailing price-to-earnings is unusable at both — Bandwidth's GAAP operating line has been negative for eight straight quarters, and Twilio's is flattered by a one-off $1.07bn tax-driven net income.

Over the three months to September 21, RingCentral rose 119.5% and Five9 89.4%. Twilio rose 40.6%; Bandwidth 6.1%, against 4.0% for the S&P 500. Monday's 7.3% jump in Bandwidth came inside a rally across software application stocks rather than on any company disclosure.

The verdict

The balance-sheet work is real, and it bought six years of runway at no coupon. It did not buy growth. Consensus has Bandwidth's revenue up 20.1% this year to $905.9m and then 4.5% in 2027, as the surcharge pass-through laps itself, against 11.4% for Twilio — and that gap, not the debt, is what the difference in gross-profit multiples is paying for. The discount is mostly earned. What nothing in the numbers explains is why a company compounding gross profit at single digits was worth $78.44 a share in July at all.

Bandwidth has not announced a date for its third-quarter report. When it comes, the surcharge line will still be inside the revenue number and still absent from the gross profit — and 2027 is when shareholders find out how much of this year's growth was ever theirs.