High-Conviction Growth Stocks to Double in 2026

In the ever-evolving landscape of growth investing, identifying companies with undervalued fundamentals, resilient business models, and industry-defining catalysts is key to capturing outsized returns. As we approach 2026, three stocks-The Trade Desk (TTD), Webull (BULL), and Sezzle (SEZZLE)-stand out as compelling opportunities. These companies are not only navigating macroeconomic headwinds but are also leveraging innovation, market tailwinds, and disciplined execution to position themselves for explosive growth. Below, we dissect their financial performance, valuation metrics, and industry dynamics to justify their inclusion in a high-conviction portfolio.

The Trade Desk: AI-Driven Advertising Dominance

The Trade Desk, a leader in programmatic advertising, has demonstrated remarkable resilience in 2025. Its Q4 2025 revenue guidance of at least $840 million reflects a 18% year-over-year growth rate (excluding political spend), building on Q2's $694 million revenue, which marked 19% YoY growth. This trajectory is underpinned by the company's accelerated adoption of AI-driven product innovations, which are streamlining ad-buying efficiency for clients.

Valuation metrics suggest TTD is undervalued despite its premium growth profile. A discounted cash flow (DCF) model estimates its intrinsic value at $81.63 per share, implying a 55.1% discount to its current price. Analysts further project a forward P/E ratio of 19.29 and an average price target of $80.85, which is 112.99% higher than its current valuation. The PEG ratio of 0.97 reinforces its fair valuation relative to earnings growth expectations.

Catalysts for 2026:
- AI integration: Enhanced ad-targeting capabilities will drive higher client retention and margin expansion.
- Political advertising tailwinds: While Q4 guidance excludes political spend, the 2026 election cycle could provide a revenue boost.
- Global expansion: The Trade Desk's international footprint is expanding, with emerging markets offering untapped growth.

Webull: Democratizing Digital Trading

Webull's Q3 2025 results underscore its rapid ascent in the digital trading space. Total revenues surged 55% YoY to $156.9 million, driven by a 17% YoY increase in registered users to 25.9 million. The platform's commission-free model and user-friendly interface have positioned it as a disruptor in a sector dominated by legacy brokers.

Valuation analysis reveals a mixed picture. While Webull trades at a P/S ratio of 7.6x-well above the peer average of 1.8x-its P/E ratio of 12.7x is significantly lower than the industry average of 27.0x, suggesting it is fairly valued. Analysts estimate its fair value at $17.98 per share, implying a 112.36% upside from its current price. However, a DCF model indicates it is overvalued by 82.9% at $8.18 per share.

Catalysts for 2026:
- Market volatility: Rising volatility is expected to boost trading volumes and user acquisition.
- Product innovation: Webull's focus on AI-driven tools and educational content will enhance user engagement.
- Regulatory tailwinds: The shift toward commission-free trading aligns with Webull's business model.

Sezzle: Revolutionizing BNPL with Scalable Growth

Sezzle's Q4 2025 results highlight its dominance in the BNPL sector. Revenues doubled to $98.2 million, driven by a 42% YoY increase in gross merchandise volume (GMV) to $855.4 million. Active users reached 2.7 million, while its Monthly On-Demand and Subscriber (MODS) base grew by 400,000 to 707,000.

Despite a 46.8% stock rally in 2025, Sezzle's valuation remains contentious. A 657.3% overvaluation is flagged by the Excess Returns model, yet its forward P/E of 19.68x is below the average of faster-growing peers, indicating a potential discount. The company's product innovations-such as the Sezzle Browser Extension and Earn Tab-have driven a 38% YoY increase in monthly active users.

Catalysts for 2026:
- BNPL market expansion: The sector's growth is accelerating as consumers seek debt-free alternatives.
- Product diversification: Subscription and financing products are unlocking new revenue streams.
- Strategic partnerships: Collaborations with retailers and fintechs will expand Sezzle's ecosystem.

Conclusion: Positioning for 2026

The Trade Desk, Webull, and Sezzle represent a rare trifecta of undervalued growth stocks with strong fundamentals and industry-defining catalysts. TTD's AI-driven advertising platform, Webull's democratization of trading, and Sezzle's BNPL innovation are poised to capitalize on macroeconomic trends and technological shifts. While valuation discrepancies exist, the long-term potential of these companies-backed by robust revenue growth, expanding user bases, and strategic differentiation-makes them high-conviction picks for investors seeking to double their returns in 2026.