Harmonic Stock Surges 16%: Revenue Jumps 64% in a Breakout Quarter

Harmonic stock surged about 16% in premarket trading on Tuesday, November 3, 2026, after the broadband company reported third-quarter revenue up 64% and raised its full-year outlook for the third time this year. The move made Harmonic one of the morning's biggest gainers on a day when Apple and Palantir were falling despite beating earnings.

What happened?

Harmonic Inc. (NASDAQ: HLIT) gained 16.1% in premarket trading, according to Reuters, with one market roundup putting the shares up 16.39% to $11.86. The jump followed results released after Monday's close for the quarter ended October 2, 2026.

Revenue from continuing operations reached $148.8 million, up 64.5% from $90.5 million a year earlier. That was well above the company's own guidance range of $125 million to $135 million. Non-GAAP earnings were $0.23 per share, up from $0.07 a year earlier and above guidance of $0.15 to $0.19. Non-GAAP operating profit more than tripled to $33.0 million from $10.1 million, also beating the $23 million to $28 million outlook, while non-GAAP gross margin expanded to 52.1% from 46.9%.

Why is the stock blowing up?

The beat was not just about one number. Chief Executive Nimrod Ben-Natan called it "a breakout" quarter, citing expansion in DOCSIS and fiber deployments, growth in the company's intelligence offerings, and new customer wins in international markets. Revenue from customers outside Harmonic's two largest accounts grew by more than 100%, a diversification point investors have watched closely because four customers each still accounted for more than 10% of third-quarter revenue.

Backlog and deferred revenue stood at $534.0 million, up 58% year over year, giving the company a large order book to convert into future sales. Cash was $142.8 million at October 2, and the company repaid $75 million on its revolving credit facility during the quarter, leaving $160 million available.

The guidance raise

Harmonic raised its full-year 2026 outlook again — its third increase this year. It now expects revenue of $545 million to $555 million, up from $505 million to $525 million previously, implying about 53% growth at the midpoint. Full-year non-GAAP operating profit is now projected at $118 million to $124 million, with non-GAAP earnings of $0.80 to $0.84 per share, a midpoint increase of 15.5%.

For the fourth quarter, the company forecast revenue of $141 million to $151 million, non-GAAP gross margin of 51% to 52%, operating profit of $28 million to $34 million, and non-GAAP earnings of $0.19 to $0.23 per share. That outlook includes about $3 million of increased memory costs in the quarter, a reminder that the same chip-cost pressures weighing on larger tech names are present here too.

What are the cautions?

The quarter was not flawless. Third-quarter bookings were $105.9 million, down from $144.3 million in the second quarter, and free cash flow was negative $5.1 million, which the company attributed partly to higher inventory and receivables. Harmonic's Video business is classified as discontinued operations following its divestiture, and the guidance includes stranded costs linked to that separation — an estimated $7.6 million for the full year.

The broader market also sets a tough backdrop. Harmonic rose on a morning when the Nasdaq-100 was in a confirmed correction, down more than 10% from its October record, and when investors were selling several companies that beat estimates. Whether Harmonic holds its premarket gain through the regular session, on U.S. midterm election day, will be the first test of how durable the move is.

What's next?

Investors will watch the fourth-quarter delivery against the $141 million to $151 million revenue range, progress converting the $534 million backlog, and whether customer growth beyond the largest accounts continues. The company has also used $142 million of its $200 million share-repurchase authorization and says it retains flexibility to assess acquisitions to diversify and scale its intelligence platform.

This report describes what happened and why markets reacted. It is not a recommendation to buy, sell, or hold any security.

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FAQ

Why did Harmonic stock surge 16% today?

Harmonic beat its own guidance on revenue, earnings, and operating profit, grew revenue 64% year over year, and raised its full-year outlook for the third time in 2026.

What were Harmonic's Q3 2026 results?

Revenue was $148.8 million, up 64.5% from $90.5 million, with non-GAAP earnings of $0.23 per share and operating profit of $33.0 million.

What is Harmonic's new full-year guidance?

The company now expects 2026 revenue of $545 million to $555 million and non-GAAP earnings of $0.80 to $0.84 per share, up from $505 million to $525 million in revenue previously.

What risks did Harmonic report?

Bookings fell to $105.9 million from $144.3 million in the prior quarter, free cash flow was negative $5.1 million, and guidance includes higher memory costs and stranded Video divestiture costs.