I. Development History of the US Stock Market

The development of the US stock market dates back to the signing of the Buttonwood Agreement in 1792. This landmark event laid the foundation for centralized securities trading in the United States and put an end to the disorderly over‑the‑counter trading in the early days.

Over more than two centuries of evolution, the US stock market has advanced alongside America’s industrial transformation. It has grown from an initial financing venue for industrial enterprises into a comprehensive capital market covering technology, consumer, healthcare, new energy, finance and other full‑spectrum industries.

Following the 20th century, the popularization of electronic trading, improvement of market‑oriented regulation and international opening‑up have enabled the US stock market to transcend geographical boundaries. It has become one of the core financial markets with global pricing influence, performing key functions for listed financing and capital circulation for high‑quality enterprises worldwide.

II. Complementary On‑Exchange and Off‑Exchange Market Structure

The US stock market has developed a multi‑tier framework combining on‑exchange bourses and over‑the‑counter (OTC) markets. Each segment has clear positioning and division of labor to meet financing needs of enterprises of varying sizes and development stages.

The core on‑exchange trading venues are the New York Stock Exchange (NYSE) and the NASDAQ. As one of the world’s oldest stock exchanges, the NYSE targets large mature enterprises with relatively high listing thresholds. It hosts leading traditional‑industry corporations globally. Adopting a hybrid model of designated market makers and electronic trading, it features strong stability and deep liquidity.

NASDAQ, officially launched in 1971, is a global benchmark for electronic trading. It features technology‑driven growth enterprises with more flexible listing criteria and has nurtured numerous world‑class tech‑innovative firms. Its fully electronic trading system delivers high efficiency with top‑tier trading activity, and it hosts a large number of listed companies among US trading venues.

In addition, the American Stock Exchange (AMEX, now NYSE American) focuses on small‑and‑mid‑cap companies, filling the gap between main boards and OTC markets. OTC segments such as the Pink Sheets mainly accommodate enterprises that fail to satisfy main‑board listing requirements, with relatively low information‑disclosure standards and lenient market‑based access thresholds.

III. Three Core Benchmark Indices of the US Stock Market

The three major US stock indices serve as vital gauges for tracking overall market trends and sector prosperity, as well as key references for global financial markets: the Dow Jones Industrial Average, the S&P 500 Index, and the NASDAQ Composite Index.

The Dow Jones Industrial Average tracks 30 top‑tier US blue‑chip corporations, predominantly from traditional industries, reflecting the aggregate performance of America’s leading blue‑chip enterprises.

The S&P 500 Index covers 500 representative listed US companies across industries. Boasting broad market‑cap coverage and balanced sector distribution, it is widely regarded as a primary barometer for the overall US stock market.

The NASDAQ Composite Index includes all securities listed on the exchange with a heavy weighting in technology stocks, mirroring market movements of global tech‑innovation industries. With differentiated positioning, the three indices jointly form the observation system for the US stock market.

IV. Highly Market‑Oriented Trading Mechanisms

In terms of trading rules, the US stock market features highly flexible, market‑driven mechanisms. First, trading hours are flexible: regular sessions consist of pre‑market, regular‑hours and after‑market trading, offering extended trading windows to accommodate investors across global time zones.

Second, subject to relevant account rules, US stocks allow same‑day purchase and sale of securities, enabling fuller release of market liquidity. Note that US regulators impose differentiated rules for different account types; same‑day trading is not entirely unrestricted.

Moreover, there are no daily price‑movement limits. Prices fluctuate purely based on market supply and demand, swiftly and truthfully reflecting market news and changes in corporate valuations.

Furthermore, the US market supports a wide array of market‑oriented trading tools and mechanisms including short selling securities lending and the market‑maker system.

NASDAQ’s competitive market‑maker system stands out as a core feature. Multiple regulated market makers continuously post bid‑ask quotes to secure liquidity for niche and small‑and‑mid‑cap securities and prevent trading halts.

Additionally, the US ETF ecosystem is highly sophisticated. ETF products span broad markets, individual sectors and cross‑asset categories. They serve as essential instruments for capital allocation and risk diversification and underpin overall market liquidity. (Risk‑return profiles vary drastically across ETFs; please refer to respective product documents for details.)

V. Dual‑Tier Multi‑Authority Regulatory System

A robust regulatory system underpins the sound operation of the US stock market. The United States applies a federal‑plus‑self‑regulatory multi‑agency securities regulatory model with well‑defined powers, responsibilities and mutual checks and balances.

At the federal level, the U.S. Securities and Exchange Commission (SEC) is the primary regulator. Its core mandates are investor protection, safeguarding fair and orderly markets, and facilitating healthy capital formation. It formulates core securities‑market rules, oversees listed‑company disclosure, governs broker‑dealers and intermediaries, and investigates market misconduct.

Meanwhile, the Financial Industry Regulatory Authority (FINRA), a self‑regulatory organization, conducts day‑to‑day self‑regulation of the securities industry and standardizes business conduct of practitioners and institutions.

Stringent information‑disclosure requirements constitute the cornerstone of US stock‑market regulation.

All listed entities must disclose quarterly and annual financial reports as well as material corporate events in a timely, truthful and complete manner. Companies with untimely, inaccurate or incomplete disclosures face severe penalties including fines, trading halts and delisting.

Rigorous disclosure mitigates information asymmetry and fosters a relatively transparent, well‑regulated marketplace for global investors — one major reason why the US stock market keeps attracting international capital and high‑quality enterprises.

In addition, delisting is normalized and market‑driven. Enterprises failing ongoing listing criteria are swiftly removed to preserve overall market quality and valuation validity.

VI. Core Characteristics of the US Stock Market

Overall, the US stock market exhibits three defining traits.

First, strong market orientation. Corporate IPOs, pricing and delisting are primarily governed by supply and demand, with limited administrative intervention and powerful market self‑correction capacity.

Second, prominent globalization. Numerous non‑US high‑quality companies pursue US listings; global investors can participate with ease. Capital sources are diversified, supporting robust global resource‑allocation capabilities.

Third, high‑level multi‑tier specialization. Main boards, growth‑oriented segments and OTC venues cater to companies at varied development stages. Trading instruments, market participants and regulators are well‑defined, forming a closed‑loop mature financial ecosystem.

Nevertheless, a sophisticated market mechanism does not equate to a risk‑free marketplace.

Features such as absence of price limits, same‑day trading and cross‑border capital flows amplify price volatility. The market is highly sensitive to global macroeconomics, industrial policies and international capital movements. Risks including market swings, information asymmetry and exchange‑rate linkage objectively exist.

To sum up, built upon over two centuries of institutional accumulation, the US stock market has developed a transparent, efficient, flexible, open and diversified financial system, serving as a representative example of market‑based capital‑market operation worldwide.

Understanding its market structure, trading mechanisms and regulatory logic helps participants objectively grasp how global financial markets function and develop rational financial perspectives, rather than fixating on short‑term price swings and speculative activity.

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