Chapter 4

The Growth Engine

The Trade Desk's revenue growth has slowed in each of the last four reported quarters, from 25% year-over-year in the first quarter of 2025 to 12% in the first quarter of 2026, and the second-quarter 2026 guide of at least $750 million implies a fifth consecutive step down, to roughly 8% [1]. The engines meant to reverse that (connected TV, retail media, international) are real, and international is genuinely re-accelerating. But the slowdown is broad and sits in the large US brand-advertiser core, which keeps the cyclical-versus-structural question open.

The deceleration, quarter by quarter

The clearest fact about the business right now is the shape of its growth. Through 2024, quarterly revenue rose 22%–28% year-over-year. Across 2025 that rate fell in every quarter, and the first quarter of 2026 came in at 12% on revenue of $689 million [2]. The second-quarter guide of at least $750 million implies a further step down to around 8% [3].

Source: derived from reported quarterly revenue, company filings; latest quarter and Q2 2026 guide per Q1 FY2026 earnings call [4]. 2Q26E is the low end of company guidance.

A one- or two-quarter dip reads as noise; four consecutive quarterly step-downs into a single-digit guide read as a trend. Management attributes it to the macro environment — most of the company's revenue comes from Fortune 500 brands, and it points to tariffs, geopolitical uncertainty, and softness in consumer-packaged-goods and automotive spend [5]. That is a coherent cyclical explanation. It is also the pattern a maturing large-cap would show, so the driver mix matters more than the headline.

Geography: the segment still accelerating

The company reports revenue by only two segments that matter for growth: the United States and international [6]. They moved in opposite directions in 2025. US revenue growth halved to 16%, while international growth accelerated to 35% — the reverse of the total.

Source: The Trade Desk FY2025 Form 10-K, Note 12 — Segment and Geographic Information [7].

International is the smaller base — $420 million of $2,896 million in 2025, about 14.5% of revenue [8]. But because it grew faster off that base, it supplied $108 million of the $451 million of total revenue added in 2025 — roughly a quarter of the increment from a seventh of the base. On the first-quarter 2026 call the split had moved further, to about 82% US and 18% international, helped by momentum in Europe and Asia-Pacific [9]. Management has said for years that markets such as the UK, Germany, France, Japan, India, and Australia are where it is investing to grow [10], and it puts roughly 60% of the total advertising opportunity outside the United States [11]. The runway is real; the constraint is that international is not yet large enough to move the total on its own.

Channel mix: CTV gains share as the total slows

The Trade Desk does not report revenue by channel, but it discloses approximate mix each quarter. Video — which includes connected TV — has steadily gained share, from the mid-40s percent of the business in early 2024 to the low-50s in the first quarter of 2026, while mobile has ceded ground and audio, though small at around 6%, grew faster than any other channel last quarter [12] [13] [14].

Source: midpoints of the approximate ranges management discloses each quarter, Q1 FY2024–Q1 FY2026 earnings calls [15] [16] [17]. Figures are approximate and do not sum to 100 (display, the remainder, runs low-double-digit).

This is the important nuance. Connected TV — the channel the company ties its future growth to, as linear television shifts to streaming and it expands CTV inventory and spend [18] — is still gaining mix share even as the total decelerates. Video/CTV winning a larger slice of a slowing whole is not the same as CTV re-accelerating the whole. Retail media is the other newer engine: the company's retail data marketplace now reaches over 80% of sales from top US retailers [19], and management counts it, alongside AI-driven search, as a reason its addressable market is expanding faster than it once expected [20]. Neither has yet been large enough to offset the gravity on the mature US display and mobile base.

The runway and the read

Management's cyclical case rests on the size of the opportunity. It frames advertising as a $1-trillion-plus market, of which the open internet — the slice The Trade Desk plays in, distinct from walled-garden social and search — is roughly $280 billion [21].

Source: The Trade Desk Q1 FY2026 Investor Presentation, market-size estimates [22].

Against a $280 billion open-internet opportunity, the company's $13.4 billion of gross spend represents under 5% penetration — genuine room to grow. That is the heart of the bull's structural argument, and it is not empty: an under-penetrated, expanding market with a smaller international engine compounding at 35% is what a fixable, cyclical slowdown can look like.

Asked directly to separate the cyclical from the structural, CEO Jeff Green was unambiguous: "The structural drivers of our business are extremely strong… reacceleration is not really about reinventing ourselves. It is about executing against the larger, expanding opportunity… In the near term this is about execution" [23]. That is management's answer to this report's central question: cyclical and self-inflicted, not a ceiling.

The evidence is genuinely two-sided, and it is worth saying which way each fact cuts. Supporting the cyclical read: international re-accelerating, CTV still gaining mix, a large under-penetrated TAM, and a slowdown that traces to specific brand-advertiser verticals — CPG and automotive — under macro and tariff pressure rather than to a channel visibly losing to a walled garden [24]. Cutting the other way: the deceleration is broad and persistent — four sequential quarterly step-downs into a single-digit fifth-quarter guide — and it is concentrated in the large US core, exactly where a maturing platform would slow, while the growth engines management points to are either too small (international, audio) or gaining share of a decelerating whole rather than lifting it (CTV). The read that fits both sets of facts: the engines are real but not yet decisive, so the near-term trajectory turns on execution against the narrow moat the report has already established. What would change it in either direction is concrete — whether international and CTV begin to re-accelerate the total, not merely their own share, once macro conditions stabilize, or whether the ~8% second-quarter guide marks a new, lower plateau. The next two quarters, not the next annual report, hold the evidence.