When was fxaix founded

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Last updated: April 17, 2026

Quick Answer: FXAIX, the Fidelity 500 Index Fund, was founded on August 10, 1988, as one of the earliest index funds offered by Fidelity Investments to provide broad exposure to the U.S. large-cap equity market.

Key Facts

FXAIX was launched on August 10, 1988, under the name Fidelity Spartan 500 Index Fund.
It tracks the S&P 500 Index, which represents approximately 80% of the U.S. equity market capitalization.
As of 2023, FXAIX holds over $350 billion in assets under management (AUM).
The fund has an expense ratio of just 0.015%, making it one of the lowest-cost index funds available.
FXAIX is available to individual investors through Fidelity brokerage and retirement accounts.

Overview

FXAIX, officially known as the Fidelity 500 Index Fund, is a passively managed mutual fund designed to mirror the performance of the S&P 500 Index. It was established to give investors low-cost, diversified access to large-cap U.S. equities, making it a cornerstone choice for retirement and long-term investment portfolios.

The fund began operations on August 10, 1988, originally under the name Fidelity Spartan 500 Index Fund. Over time, it evolved into one of the largest and most widely held index funds in the United States, benefiting from Fidelity’s decision to eliminate minimum investment requirements and reduce fees significantly.

Launch Date: FXAIX traces its origins to August 10, 1988, when Fidelity first introduced its S&P 500-tracking index fund to retail investors.
Rebranding: In 2018, Fidelity rebranded several of its Spartan index funds, and the fund became widely known as FXAIX under its current ticker.
Index Tracked: The fund is designed to replicate the S&P 500 Index, which includes 500 of the largest publicly traded U.S. companies by market capitalization.
Accessibility: FXAIX removed its minimum investment requirement in 2018, making it accessible to millions of new investors through Fidelity accounts.
Performance: Over the past 30 years, the fund has delivered an average annual return of approximately 9.8%, closely matching its benchmark index.

How It Works

FXAIX operates as a passively managed index fund, meaning it does not rely on active stock selection but instead aims to replicate the composition and performance of its underlying index.

Passive Management: The fund uses a passive investment strategy, automatically buying and holding the same stocks as the S&P 500 in proportion to their market weight.
Rebalancing: FXAIX is rebalanced periodically—typically quarterly—to reflect changes in the index’s constituents and market valuations.
Dividend Reinvestment: The fund automatically reinvests dividends from constituent stocks, contributing to long-term compounding growth for investors.
Low Turnover: With an annual turnover rate of less than 5%, FXAIX minimizes trading costs and tax implications for shareholders.
Expense Ratio: At just 0.015%, FXAIX’s expense ratio is among the lowest in the industry, significantly undercutting many competitors.
Trading Mechanism: Unlike ETFs, FXAIX is a mutual fund priced once daily after market close, based on its net asset value (NAV).

Comparison at a Glance

Here’s how FXAIX stacks up against other major S&P 500 index funds in key categories:

Fund	Expense Ratio	Minimum Investment	Assets Under Management (2023)	Launch Year
FXAIX	0.015%	$0	$352 billion	1988
VFIAX (Vanguard)	0.04%	$3,000	$780 billion	1976
SPXFX (Schwab)	0.02%	$100	$25 billion	2005
SPY (ETF)	0.0945%	No minimum	$420 billion	1993
IVV (iShares)	0.03%	No minimum	$300 billion	2000

This comparison shows that while FXAIX is not the oldest S&P 500 fund, its combination of ultra-low fees, no minimum investment, and massive scale makes it highly competitive. It appeals particularly to cost-conscious investors using Fidelity platforms.

Why It Matters

FXAIX plays a crucial role in democratizing access to low-cost index investing, especially for individual and beginner investors. Its structure and pricing model have influenced broader industry trends toward lower fees and greater accessibility.

Cost Efficiency: With an expense ratio of only 0.015%, FXAIX saves investors thousands of dollars in fees over decades compared to higher-cost alternatives.
Retirement Planning: The fund is a popular choice in 401(k) and IRA accounts, helping millions build long-term wealth through compound growth.
Market Influence: Managing over $350 billion, FXAIX’s ownership stakes in S&P 500 companies give it indirect influence on corporate governance.
Behavioral Impact: By offering a simple, low-effort investment, FXAIX encourages disciplined, long-term investing over market timing.
Competitive Pressure: FXAIX’s fee cuts forced other fund providers like Vanguard and Schwab to lower their own fees, benefiting all investors.
Financial Inclusion: Eliminating minimums allows low- and moderate-income investors to participate fully in the stock market.

Overall, FXAIX represents a milestone in the evolution of index investing—combining scale, affordability, and accessibility in a way that reshaped investor expectations and industry standards.