S&P 400

S&P 400
Name	S&P 400
Operator	S&P Dow Jones Indices
Inception	1991
Constituents	400
Capitalization	Mid-cap

S&P 400 The S&P 400 is a mid-capitalization stock market index operated by S&P Dow Jones Indices tracking 400 publicly traded companies in the United States. It serves as a benchmark for mid-sized firms alongside large-cap indexes such as S&P 500 and smaller-cap measures like the Russell 2000, and is widely used by asset managers, pension funds, and exchange-traded fund providers including Vanguard Group, BlackRock, and State Street Corporation.

Overview

The index was launched amid market developments in the early 1990s alongside initiatives from Standard & Poor's and later coordination with Dow Jones & Company. It occupies a central role in comparative performance analysis for funds that overlap with mandates influenced by institutions such as the U.S. Securities and Exchange Commission, trustees at the CalPERS system, and academic research from scholars affiliated with Harvard University and the Wharton School. Market commentators from The Wall Street Journal, Financial Times, and analysts at Goldman Sachs and Morgan Stanley frequently cite the index in coverage of capital markets and corporate earnings cycles.

Composition and Eligibility

Constituent selection follows criteria administered by committees composed of representatives from S&P Dow Jones Indices and corporate governance experts with input from market participants including representatives from New York Stock Exchange, NASDAQ, and institutional investors like Fidelity Investments. Companies considered for inclusion typically have listings in the United States, meet minimum thresholds for float-adjusted market capitalization compared to peers like firms in the S&P 500 and Russell Midcap Index, maintain adequate liquidity measured by trading volume on venues such as NYSE Arca and NASDAQ OMX, and demonstrate financial viability via revenue and earnings reported to regulators like the Securities and Exchange Commission. Recent inclusions and exclusions have involved corporations familiar to the public such as Baxter International, Lennar Corporation, Hasbro, and T-Mobile US during restructuring or spin-off events evaluated alongside corporate actions like mergers overseen by Federal Trade Commission reviews.

Calculation and Methodology

The index employs a float-adjusted market-capitalization weighting methodology devised by analysts at Standard & Poor's that adjusts constituent weights for public free float similar to approaches used for the S&P 500 and contrasts with equal-weighted systems like some strategies offered by Invesco. Corporate actions such as stock splits, dividends, spin-offs, and mergers — reviewed in contexts like United States v. Microsoft Corp.-era regulatory frameworks — trigger adjustments and pro rata factor updates executed by index committees. Calculation protocols rely on real-time price feeds from market data vendors such as Bloomberg L.P. and Refinitiv, with dissemination through exchanges and platforms including NYSE Arca and professional terminals used by traders at Citadel LLC and Bridgewater Associates.

Performance and Historical Returns

Historic returns for the index have been analyzed in academic studies at institutions like Massachusetts Institute of Technology, Stanford University, and University of Chicago and reported by research departments at J.P. Morgan and Bank of America Merrill Lynch. Over multi-decade horizons the index has delivered performance influenced by business cycles, credit events such as the 2008 financial crisis, and macro shocks including the COVID-19 pandemic, with periods of outperformance relative to the Russell 2000 and episodic lagging behind the S&P 500 depending on sector composition and interest rate regimes set by the Federal Reserve System. Total return series incorporate dividends and are used in studies of factor premia alongside investigations of value and momentum published in journals like the Journal of Finance.

Constituents and Sector Breakdown

The index spans sectors classified by the Global Industry Classification Standard with exposure across sectors such as industrials familiar to Caterpillar Inc. and Honeywell International, financials exemplified by firms like KeyCorp and Regions Financial Corporation, healthcare featuring companies akin to Laboratory Corporation of America and HCA Healthcare, consumer discretionary names comparable to TJX Companies and Leggett & Platt, and information technology peers in the mold of Oracle Corporation and Adobe Inc.. Sector weights evolve through reconstitution events and are monitored by portfolio strategists at firms like BlackRock and Vanguard to manage active risk relative to benchmarks used by endowments such as Yale University and sovereign wealth funds like the Norwegian Government Pension Fund Global.

Index Management and Providers

Index stewardship resides with S&P Dow Jones Indices, a joint venture involving S&P Global, Chicago Mercantile Exchange Group, and historical associations with McGraw Hill Financial. Licensing arrangements allow exchange-traded funds and mutual funds issued by sponsors such as Vanguard, iShares, and State Street Global Advisors to offer products that track the index or create synthetic exposures. Independent auditors and governance frameworks involve external advisors and committees with members drawn from academia and the asset management community, echoing oversight practices used for other benchmarks like the MSCI World Index.

Market Impact and Usage in Investing

The index is widely used as a performance benchmark for mid-cap mandates employed by institutional investors including CalSTRS, University of California Retirement Plan, and family offices advised by firms like Goldman Sachs Private Wealth Management. Exchange-traded funds and indexed mutual funds tracking the index provide channels for retail investors through platforms such as Charles Schwab, Fidelity Investments, and Robinhood Markets. Portfolio construction strategies utilize the index in blended benchmarks with the S&P 500 and Russell 2000 for core-satellite allocations, factor tilts implemented by quantitative managers at Two Sigma and AQR Capital Management, and for liability-driven investment overlays used by pension consultants from Mercer and Willis Towers Watson.

Category:Stock market indices