Magnite (MGNI) Stock Jumps 18.6% on Q3 Earnings Beat

Magnite stock rose 18.6% in early trading on November 5, 2026, the morning after the ad-tech company reported third-quarter 2026 results. Contribution ex-TAC grew 20% year over year to $200.6 million. This is revenue minus the traffic acquisition costs Magnite pays publishers on certain sales, and it is the company's main top-line measure.

What Magnite reported

Adjusted EBITDA is profit before interest, tax, depreciation and amortization, also excluding stock-based pay and some one-off items. Connected TV (CTV, ads on streaming services watched on internet-connected TVs) drove the quarter. CTV contribution ex-TAC grew 39% to $105.4 million, above the company's own $98 to $100 million guidance, and now makes up 53% of the total. The rest of the business, which Magnite calls DV+, grew 5% to $95.3 million.

Magnite raised its full-year 2026 outlook. It now expects contribution ex-TAC growth of about 17%, up from 13% to 14%, and free cash flow growth above 60%, up from the high 40% range. It also expects full-year political ad spend to be nearly three times its initial forecast.

Why the stock rose 18.6%

The gain was about six and a half times a typical day's swing for the stock. The main driver was the size of the beat: total contribution ex-TAC cleared the top of Magnite's $188 to $192 million guidance range. The adjusted EBITDA margin widened to 42% from 34% a year earlier. CEO Michael G. Barrett said strong execution produced "outstanding operating leverage," which prompted the company "to once again raise our full-year outlook across all key performance metrics."

What to watch next

• Q4 2026 total contribution ex-TAC guidance of $227 million to $233 million.

• Q4 2026 CTV contribution ex-TAC guidance of $124 million to $127 million.

• 2027 target: top-line growth over 15% excluding political ads, or 10% on a total reported basis.

FAQ

What does Magnite do?

Magnite describes itself as the world's largest independent sell-side advertising company. Publishers use its technology to sell ad space across CTV, online video, display and audio.

Is Magnite buying back shares or paying down debt?

Yes. In the first nine months of 2026 it spent $55.6 million on share buybacks, up from $22.9 million a year earlier, and repaid $205.1 million of convertible notes. Over the same period, cash fell to $392.9 million from $553.4 million.

Sources

• 10-Q - MAGNITE, INC.

• 8-K - MAGNITE, INC. earnings release exhibit

• 8-K - MAGNITE, INC.

This article is for information only and is not investment advice.