A Webinar Promising 849% with a Systematic 'Stock-Box'

On 21 July at 18:00 CEST, retail investors are invited to a free webinar that promises to reveal a systematic approach to picking stocks: the so-called NASDAQ-Stock-Box. The event, presented by WH SelfInvest and run by product manager Stefan Behleit, showcases a momentum-based system that scans the NASDAQ index and selects the eight stocks with the strongest relative strength each period.

According to promotional material, this rule-based strategy has produced a cumulative return of 849% over roughly nine and a half years as of June 2026. The host argues that such a disciplined, emotion-free process works especially well in the current environment, where market gains are often concentrated in a handful of large-cap names and breadth is thin. The webinar will walk through how the Stock-Box filters candidates, how it is rebalanced, and why the team believes a reproducible momentum method beats gut feelings.

Registration is free and a recording will be made available only to those who sign up. The pitch is straightforward: momentum is not left to chance; it is turned into a transparent, actionable portfolio.

What Momentum Investing Can—and Can't—Deliver

Momentum as a factor – real but not risk-free

Momentum investing – buying stocks that have recently outperformed and selling those that have lagged – is a well-documented equity factor in academic finance. Systematic strategies that capture it can generate strong returns, but they also come with sharp drawdowns, especially during sudden reversals like the 2022 tech sell-off. The 849% figure sounds extraordinary, yet without knowing whether it is a live track record or a backtest, and whether it accounts for trading costs, management fees and taxes, the number is hard to assess.

The index effect

The NASDAQ-100 itself has been one of the best-performing indices over the last decade, driven by mega-cap tech, AI optimism and the semiconductor boom. Even a simple buy-and-hold strategy would have delivered robust returns. Therefore, investors need to compare the Stock-Box performance against a relevant benchmark – not just a theoretical cash return – to understand if the system adds value beyond the strong tailwind of the underlying market.

Who is behind the system?

The webinar is hosted by WH SelfInvest, a Luxembourg-based broker, and Investui, its affiliated asset manager. Stefan Behleit, the speaker, is described as a “market effects” expert. The companies have a commercial interest in promoting the strategy; that doesn’t make the claims false, but it means the information is not independent analysis.

Four Questions Before You Bet on a 'Stock-Box'

  • Ask whether the 849% is net of fees. If the figure comes from a backtest, it likely excludes brokerage commissions, management fees and taxes. Even a live track record may leave out ancillary costs.
  • Compare to a realistic benchmark. Over the same period, the Nasdaq-100 total return index gained roughly 400-500%. A meaningful outperformance calculation shows the true value-added versus the index itself.
  • Check for survivorship bias. A simple momentum screen that looks at stocks currently in the index ignores companies that were delisted or went bankrupt. Real-world results are often lower when this bias is corrected.
  • Understand the risk of drawdowns. Momentum strategies can suffer losses of 30% or more in trend reversals. Ask the presenter how large the worst peak-to-trough decline was.