Boston Scientific Stock Plunges 8%, Wiping Out $5.4 Billion After Cyberattack Forces Outlook Cut
The device maker trimmed its 2026 profit outlook after an August cybersecurity incident and guided to lower fourth-quarter sales.
Boston Scientific shares plunged 8.23% to $41.35 in Wednesday trading, as of 10:13 a.m. ET, erasing $5.4 billion in market value, after the medical-device maker cut its 2026 outlook following an August cybersecurity incident. Management also guided to lower fourth-quarter sales and called 2027 the trough.
A lower profit outlook
Boston Scientific now projects 2026 earnings per share of $3.16 to $3.18, excluding certain items. The move came on the day the company reported results; third-quarter revenue was $5.14 billion.
Fourth-quarter sales are expected to come in lower, according to the SEC filing, and per-share profit slipped to $0.40 from $0.51.
On the earnings call, management said weakness in Watchman and electrophysiology will last through 2027, and it is aiming for 2028 for a stronger rebound.
A stock already down 53% this year
Boston Scientific makes medical devices used to treat and diagnose disease, sold mainly to hospitals, physicians and other health care providers worldwide. International sales were 36% of global net sales in 2025.
The shares were down about 53% year to date at Tuesday's close, while the S&P 500 was up about 13%. Before Wednesday's session the stock sat 57% below its highest close of the past year, set on November 13, 2025.
Wednesday's drop put the stock on pace for a fourth straight daily decline and its biggest one-day fall since May 27. Its market value was $59.9 billion at the time of the report.
Management's own timeline puts the trough in 2027 and a stronger rebound in 2028.
Correction, Oct. 29, 2026: An earlier version of this story linked a statement from the company's earnings call to a page that did not contain it. The link has been removed.
Sources
- Boston Scientific Stock Crashes As Cybersecurity Attack Weighs On Guidance | Investor's Business Daily — investors.com
- Boston Scientific stock drops on duidance cut (BSX:NYSE) | Seeking Alpha — seekingalpha.com
- Boston Scientific Warned You. It Slashed Earnings Guidance After Cyberattack Hit Its Business. — Barron's
- Boston Scientific (BSX) Q3 Earnings Match Estimates — Yahoo Finance
- Alphabet, FedEx, GE Vernova, KLA, Microsoft: Earnings-Day Vol — news.bloomberglaw.com
- The company's filing (Boston Scientific) — SEC filing
- Boston Scientific — Form 10-Q for the quarter ended 2010-09-30 (quarterly results) — SEC EDGAR
