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# Boston Scientific Stock Plunges 8%, Wiping Out $5.4 Billion After Cyberattack Forces Outlook Cut
- URL: https://www.bullished.co/boston-scientific-stock-plunges-8-wiping-out-5-4-billion-after-cyberattack-forces-outlook-7812b405/
- Published: 2026-10-28T14:14:14.000Z
- Updated: 2026-10-29T10:06:25.000Z
- Description: The device maker trimmed its 2026 profit outlook after an August cybersecurity incident and guided to lower fourth-quarter sales.
- Author: Matteo Parrino
- Tags: Markets, BSX, Industry: Healthcare

[Boston Scientific](https://www.bullished.co/tag/bsx/) shares plunged [8.23% to $41.35](https://www.investors.com/news/technology/boston-scientific-stock-boston-scientific-earnings-q3-2026/?ref=bullished.co) 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](https://www.investors.com/news/technology/boston-scientific-stock-boston-scientific-earnings-q3-2026/?ref=bullished.co), 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](https://www.sec.gov/Archives/edgar/data/0000885725/000088572526000066/bsx-20261028.htm?ref=bullished.co), 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](https://www.investors.com/news/technology/boston-scientific-stock-boston-scientific-earnings-q3-2026/?ref=bullished.co) — investors.com
- [Boston Scientific stock drops on duidance cut (BSX:NYSE) | Seeking Alpha](https://seekingalpha.com/news/4658819-boston-scientific-drops-after-cutting-2026-outlook-on-cybersecurity-incident?ref=bullished.co) — seekingalpha.com
- [Boston Scientific Warned You. It Slashed Earnings Guidance After Cyberattack Hit Its Business.](https://www.barrons.com/articles/boston-scientific-earnings-stock-price-4fede8e2?mod=hp%5FEARNINGSREPORT%5F1&ref=bullished.co) — Barron's
- [Boston Scientific (BSX) Q3 Earnings Match Estimates](https://finance.yahoo.com/healthcare/articles/boston-scientific-bsx-q3-earnings-105002729.html?.tsrc=rss&ref=bullished.co) — Yahoo Finance
- [Alphabet, FedEx, GE Vernova, KLA, Microsoft: Earnings-Day Vol](https://news.bloomberglaw.com/bankruptcy-law/alphabet-fedex-ge-vernova-kla-microsoft-earnings-day-vol?ref=bullished.co) — news.bloomberglaw.com
- [The company's filing (Boston Scientific)](https://www.sec.gov/Archives/edgar/data/0000885725/000088572526000066/bsx-20261028.htm?ref=bullished.co) — SEC filing
- [Boston Scientific — Form 10-Q for the quarter ended 2010-09-30 (quarterly results)](https://www.sec.gov/Archives/edgar/data/885725/000095012310101570/0000950123-10-101570-index.html?ref=bullished.co) — SEC EDGAR

### More on Boston Scientific

- [Boston Scientific Calls 2027 The Trough As Watchman And Heart-Rhythm Drags Persist](https://www.bullished.co/boston-scientific-calls-2027-the-trough-as-watchman-and-heart-rhythm-drags-persist-97728c31/)
- [Boston Scientific CFO: 'We Need To Rebuild Confidence In Our Forecasts'](https://www.bullished.co/boston-scientific-cfo-we-need-to-rebuild-confidence-in-our-forecasts-dc9afa59/)
- [Boston Scientific Sales Rise Just 1.5% In Third Quarter, And It Guides To A Fourth-Quarter Drop](https://www.bullished.co/boston-scientific-sales-rise-just-1-5-in-third-quarter-and-it-guides-to-a-fourth-quarter-f2be57d7/)

[All Boston Scientific (BSX) coverage →](https://www.bullished.co/tag/bsx/)