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Retail investing 2.0: The economic impact of high-frequency trading infrastructure on global stock markets
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Over the past five years, the US stock market has undergone a fundamental transformation. In 2020, retail investors primarily used simple mobile apps to buy stocks. By 2025-2026, they will have become full-fledged participants in a sophisticated fintech ecosystem that includes analytics, algorithmic trading, and access to global capital markets.
According to industry analysts estimates for 2025, the share of retail investors in the total trading volume on US exchanges will remain stable at 20-25%. For comparison, in 2020 this figure did not exceed 12%. This indicates not just an increase in activity, but a change in the market structure itself.
Modern trading platforms have ceased to be mere investment apps. They have become full-fledged financial ecosystems, offering institutional-grade tools, from complex orders to access to liquidity providers. At the center of this transformation is high-speed infrastructure, previously available only to large players.
HFT and execution speed: The new market standard
Capital markets prioritize speed. It’s no longer just a technical advantage, but a fully-fledged economic category. Even a microsecond’s delay can impact the quality of trade execution and the final outcome for the user. Over the past year, most leading trading platforms have been investing in infrastructure optimization.
The key element of this system is the matching engine – the core mechanism that ensures instant order matching. Building this kind of infrastructure from scratch requires deep expertise in both financial engineering and real-time systems architecture, which is why many brokers and fintech startups work with stock trading development teams rather than relying on generic software contractors.
In the context of high-frequency trading (HFT), its role is that of scale. It must not simply execute trades, but do so with maximum precision, predictability, and without slippage. For retail investors, this means fairer entry and exit costs.
Integration with liquidity providers is equally important. Modern platforms go beyond their internal liquidity pool. They aggregate offers from multiple sources, including market makers and institutional players. This allows for tighter spreads and increased market depth, which is especially important during volatile periods.
HFT infrastructure is also changing the very concept of user experience (UX) in finance. Users no longer simply evaluate the platform interface. They expect every action (from placing an order to its execution) to be instantaneous and error-free. Delays or inconsistencies in execution prices are becoming critical factors affecting platform trust.
Moreover, execution speed directly impacts the competitiveness of a trading platform. In an environment where users can switch services with just a few clicks, even a small advantage in latency can be decisive. This is why leading market players are effectively transforming into tech companies, where infrastructure is a key asset.
Economic impact: Liquidity, volatility, and democratization
The development of HFT infrastructure and its integration into retail platforms is having a profound and multifaceted impact on global capital markets. This primarily concerns liquidity. Connectivity to various liquidity providers and the ability to execute trades almost instantly are contributing to a denser market.
In 2025, major US exchanges saw historically low bid/ask spreads for large-cap stocks. This means investors can enter and exit positions with minimal costs.
However, increased liquidity also has a downside. Specifically, it increases short-term volatility. High-frequency trading algorithms react to market signals almost instantly. Consequently, this leads to sharp price movements even with minor information triggers. This creates an environment where the market is more efficient in the long term but less stable in the short term.
Another important aspect is the changing role of the retail investor. Thanks to access to institutional infrastructure, they are no longer passive participants. Modern investors can act quickly, use complex order types, and interact with global liquidity flows. This is the essence of the democratization of trading.
Globally, this leads to a redistribution of power between different groups of market participants. Institutional players retain an advantage in volume and analytics, while the retail segment becomes more influential in terms of liquidity and market dynamics.
At the same time, the development of the fintech ecosystem facilitates the integration of various financial instruments (from stocks to derivatives) into unified platforms. This increases overall market efficiency, but also increases its complexity and interdependence.
Challenges for developers: speed, security, and scale
With the rapid development of Retail Investing 2.0, creating a modern trading platform is becoming a complex strategic task. The main challenge is the combination of three critical factors: speed, reliability, and regulatory compliance.
The first challenge is scaling. In 2025-2026, peak platform loads could increase dramatically during major market events. The system must process millions of orders in real time without delays or failures. Any performance degradation immediately impacts the User Experience (UX) in Finance and can lead to user churn.
The second aspect is security. Increasing trading volumes and the number of active users make platforms an attractive target for cyberattacks and financial manipulation. Data protection, fraud prevention, and transaction integrity are becoming critical elements of the infrastructure.
The third key factor is Regulatory Compliance (SEC) and other international standards. Regulators require maximum transparency in trade execution, clear disclosure, and effective risk management. In 2026, special attention will be paid to best execution, retail investor protection, and oversight of algorithmic trading.
Additionally, platforms must consider the complexity of integration with Liquidity Providers and other market participants. This is not only a technical but also a business challenge – ensuring stable and favorable conditions for access to liquidity.
Ultimately, modern trading platform development is a balancing act between innovation and stability. Companies that can effectively navigate these challenges will gain a strategic advantage. Others risk being left out of the next generation of financial services.
Conclusion: The future of investment platforms in 2026-2028
The development of next-generation retail investing (Retail Investing 2.0) will only accelerate in the coming years. It is expected that by 2028, retail investors’ share of global trading could exceed 30%, particularly due to the expansion of the Asian and European markets.
The key to success will not just be market access, but the quality of infrastructure. Platforms that can provide ultra-low latency, deep integration with liquidity providers, and a seamless financial user experience will gain a distinct competitive advantage.
At the same time, the role of custom development will only grow. One-size-fits-all solutions no longer meet market demands. Each platform must adapt to its own audience, regulatory environment, and business model. Ultimately, high-frequency infrastructure is no longer an invisible part of the market. It is becoming its foundation and a key factor in the stability of the entire global financial system.
