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Fidelity Flex U.S. Bond Index Fund (FIBUX) Fund Overview

Educational signal · not a buy or sell recommendation · How to read this

$8.71 -$0.02 (-0.23%)

Beta 1.00: the stock has moved roughly in step with the S&P 500.

Data from FMP · Methodology

For informational purposes only. Not financial advice. Machine-generated analysis by Stock Expert AI — model gemini-2.0-flash, generated Mar 17, 2026. Editorial oversight is systemic, not page-by-page. Editorially accountable: Sedat ANAK, Founder and Editor-in-Chief. Data sources: Financial Modeling Prep, Yahoo Finance, SEC EDGAR

Quick Answer

Fidelity Flex U.S. Bond Index Fund (FIBUX) trades at $8.71. Fidelity Flex U.S. Bond Index Fund (FIBUX) aims to replicate the performance of the Bloomberg U.S. Aggregate Bond Index. Sector: Financials.

Price as of · Last analyzed: Mar 17, 2026
Fidelity Flex U.S. Bond Index Fund (FIBUX) aims to replicate the performance of the Bloomberg U.S. Aggregate Bond Index. The fund invests primarily in bonds and utilizes statistical sampling to match the index's returns.

Analyst Coverage for FIBUX: FIBUX does not currently have published analyst price targets in our coverage universe. This is common for smaller-cap names with limited Wall Street coverage.

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Fidelity Flex U.S. Bond Index Fund (FIBUX) Financial Services Profile

HeadquartersBoston, US
IPO Year2017

Fidelity Flex U.S. Bond Index Fund (FIBUX) provides investors access to the U.S. bond market, tracking the Bloomberg U.S. Aggregate Bond Index, employing statistical sampling for efficient replication, and offering a low-cost way to diversify fixed-income portfolios within the financial services sector.

Data Provenance | Financial Data Quantitative Analysis Analysis: Mar 17, 2026

What Is the Investment Thesis for FIBUX?

AI-written as of Mar 17, 2026 — figures and tone reflect the data available then, not today's score.

Fidelity Flex U.S. Bond Index Fund (FIBUX) presents a compelling investment for investors seeking broad exposure to the U.S. investment-grade bond market. The fund's primary value driver is its ability to closely track the Bloomberg U.S. Aggregate Bond Index, providing a return profile that mirrors the overall bond market. With a market capitalization of $3.77 billion, FIBUX offers substantial liquidity and scale. A key growth catalyst is the increasing demand for passive investment strategies and the continued interest in fixed-income assets for diversification and risk management. However, investors should be aware of potential risks, including interest rate sensitivity and credit risk within the bond market. The fund's beta of 1.00 indicates that its price movements generally correlate with the broader market.

Based on FMP financials and quantitative analysis

FIBUX Key Highlights

AI-written as of Mar 17, 2026 — figures and tone reflect the data available then, not today's score.

FIBUX aims to replicate the performance of the Bloomberg U.S. Aggregate Bond Index, offering broad exposure to the U.S. investment-grade bond market.

  • The fund employs statistical sampling techniques to efficiently track the index's returns, focusing on key factors such as duration and credit quality.
  • With a market capitalization of $3.77 billion, FIBUX provides substantial liquidity and scale for investors.
  • FIBUX has a beta of 1.00, indicating that its price movements generally correlate with the broader market.
  • The fund does not offer a dividend yield, which may be a consideration for income-focused investors.

Who Are FIBUX's Competitors?

FIBUX is benchmarked below against 5 industry peers on price, market cap, and our AI MoonshotScore.

Company Price Change Market Cap MoonshotScore
FHCIX Fidelity Advisor Health Care Fund $75.16 +0.43% $3.40B —
FKKSX Federated Hermes Kaufmann Small Cap Fund $48.31 +0.98% $3.08B —
FNSOX Fidelity Short-Term Bond Index Fund $9.85 -0.10% $3.97B —
FUMBX Fidelity Short-Term Treasury Bond Index Fund $10.09 -0.10% $3.53B —
JCNCX Janus Henderson Contrarian Fund $26.67 +1.60% $3.35B —

AI Score by Stock Expert AI · Price data: FMP / Yahoo Finance

What Are FIBUX's Key Strengths?

Low expense ratio.

  • Diversified exposure to the U.S. bond market.
  • Efficient index tracking.
  • Strong brand reputation of Fidelity.

What Are FIBUX's Weaknesses?

Limited potential for outperformance due to passive strategy.

  • Vulnerability to interest rate risk.
  • Dependence on the performance of the Bloomberg U.S. Aggregate Bond Index.
  • No dividend yield.

What Are the Key Risks for FIBUX?

Rising interest rates could negatively impact bond prices.

  • Credit risk could lead to defaults and losses.
  • Increased competition from other bond funds.
  • Changes in market conditions could affect the fund's performance.
  • Inflationary pressures could erode the real value of bond returns.

What Are FIBUX's Competitive Advantages?

  • Strong brand reputation of Fidelity Investments.
  • Low-cost structure due to passive investment strategy.
  • Efficient index tracking capabilities.
  • Large asset base providing economies of scale.

What Does FIBUX Do?

Fidelity Flex U.S. Bond Index Fund (FIBUX) is designed to mirror the investment results of the Bloomberg U.S. Aggregate Bond Index, a widely recognized benchmark for the U.S. investment-grade bond market. The fund was created by Fidelity Investments, a leading financial services company with a long history of providing investment solutions to individuals and institutions. FIBUX primarily invests in a diversified portfolio of bonds that are included in the Bloomberg U.S. Aggregate Bond Index. To efficiently replicate the index's performance, the fund employs statistical sampling techniques, focusing on key factors such as duration, maturity, interest rate sensitivity, security structure, and credit quality. This approach allows FIBUX to achieve similar returns to the index while holding a smaller number of securities. The fund operates within Fidelity's central fund structure, leveraging the firm's established infrastructure and expertise. FIBUX offers investors a cost-effective way to gain exposure to a broad range of U.S. bonds, making it a popular choice for those seeking diversified fixed-income investments.

What Products and Services Does FIBUX Offer?

  • Invests in a diversified portfolio of U.S. bonds.
  • Tracks the performance of the Bloomberg U.S. Aggregate Bond Index.
  • Uses statistical sampling to replicate the index's returns.
  • Provides investors with exposure to the U.S. investment-grade bond market.
  • Offers a low-cost way to diversify fixed-income portfolios.
  • Manages assets on behalf of individual and institutional investors.

How Does FIBUX Make Money?

  • Generates revenue through management fees charged on assets under management (AUM).
  • Aims to provide investment results that correspond to the Bloomberg U.S. Aggregate Bond Index.
  • Utilizes statistical sampling techniques to efficiently replicate the index's performance.

What Industry Does FIBUX Operate In?

Fidelity Flex U.S. Bond Index Fund operates within the asset management industry, specifically focusing on fixed-income investments. The industry is characterized by a wide range of players, from large asset managers to smaller specialized firms. Market trends include the increasing popularity of passive investment strategies, driven by their low cost and ability to track market benchmarks. The competitive landscape includes other index funds and ETFs that offer similar exposure to the U.S. bond market. FIBUX competes with funds like FHCIX, FKKSX, FNSOX, FUMBX, and JCNCX, all vying for investor capital seeking fixed-income exposure.

Who Are FIBUX's Key Customers?

  • Individual investors seeking fixed-income exposure.
  • Institutional investors, such as pension funds and endowments.
  • Financial advisors building diversified portfolios for their clients.
  • Retirement plan participants looking for bond fund options.
Model self-rating on this text: 73% (not a measure of the evidence) Updated: Mar 17, 2026

Research confidence

Low

Thin evidence — scoring coverage unknown. Treat this as a starting point, not a conclusion.

  • ● Scoring coverage unknown
  • ● Price is current
  • ● No filing on record
  • ● No analyst coverage
  • ● This is a fund, not an operating company

FIBUX Financials

Bull Case vs Bear Case

Bull Case

  • Low expense ratio.
  • Diversified exposure to the U.S. bond market.
  • Efficient index tracking.
  • Strong brand reputation of Fidelity.

Bear Case

  • Limited potential for outperformance due to passive strategy.
  • Vulnerability to interest rate risk.
  • Dependence on the performance of the Bloomberg U.S. Aggregate Bond Index.
  • No dividend yield.

AI-generated arguments based on insider flow, news sentiment and technicals — not financial advice · March 2026

FIBUX Latest News

No recent news available for FIBUX.

FIBUX Analyst Consensus

Consensus Rating

Aggregated Buy/Hold/Sell recommendations collected by Financial Modeling Prep for FIBUX.

Price Targets

Wall Street price target analysis for FIBUX.

FIBUX MoonshotScore

MoonshotScore is Stock Expert AI's proprietary 0-100 research rating, not a buy or sell recommendation. No MoonshotScore is published for FIBUX; grades run from A+ (80-100) to F (below 30).

FIBUX Financials Stock FAQ

What does Fidelity Flex U.S. Bond Index Fund do?

Fidelity Flex U.S. Bond Index Fund (FIBUX) is designed to replicate the performance of the Bloomberg U.S. Aggregate Bond Index, a benchmark representing the U.S. investment-grade bond market.

What are the main risks for FIBUX?

The primary risks associated with Fidelity Flex U.S. Bond Index Fund (FIBUX) include interest rate risk and credit risk. Rising interest rates can negatively impact bond prices, potentially leading to losses for the fund. Credit risk refers to the possibility that bond issuers may default on their debt obligations, resulting in losses for the fund.

How sensitive is FIBUX to interest rate changes?

Fidelity Flex U.S. Bond Index Fund (FIBUX) is sensitive to interest rate changes, as its value is tied to the performance of the underlying bonds in its portfolio. When interest rates rise, the value of existing bonds typically declines, which can negatively impact FIBUX's net asset value (NAV).

Disclaimer: This content is for informational purposes only and does not constitute investment advice. Always do your own research and consult a financial advisor.

Official Resources

Price as of Analysis updated

MoonshotScore is not published for this security.

Data Sources & Methodology
Figures come from Financial Modeling Prep (FMP). If FMP has no figure for a ticker, a price or fundamental may come from a Yahoo Finance fallback, or a price from an Alpaca fallback. SEC EDGAR is used only for filing links and company identity details (legal name, address), never for figures. AI analysis by Stock Expert AI proprietary algorithms. Technical indicators via industry-standard calculations. Last updated: .
Data Provenance
Sources: Financial Modeling Prep (FMP) — Primary · Yahoo Finance — Fallback · Alpaca — Tertiary
Last fetched:
Cache TTL: Quote 5min · Profile 7d · Financials 7d · Insider 48h
How we use AI: Numbers are pulled directly from FMP & Yahoo Finance — our AI writes the analysis, it never edits the figures.
Data provided as-is for educational purposes. Not financial advice. Methodology

Data provided for informational purposes only.

Analysis Notes
  • The information provided is based on available data and may be subject to change.
Data Sources
Financial Modeling Prep (FMP)Stock Expert AI proprietary analysis