FDFIX Performance — Fidelity Flex 500 Index Fund
Data updated: 2026-07-24
FDFIX returned +10.97% year to date and +29.16% over one year to May 2026. Annualised returns are +23.41% over 3 years and +14.04% over 5 years. The fund beat its US Large Blend category average: $100 invested three years ago grew to $188, against $165 for the category, and to $129 over one year, against $122. Volatility over the past three years was 13.27% a year. In the 12 months to May 2026 the fund took in a net $1.2B, and assets reached $9.20B.
FDFIX Growth of $100
What $100 invested in Fidelity Flex 500 Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Large Blend category average over the same months.
| Period | FDFIX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $129 | $122 |
| 3 years (Jun 2023 – May 2026) | $188 | $165 |
| 5 years (Jun 2021 – May 2026) | $193 | $164 |
| Since data start (Sep 2019 – May 2026) | $286 | $229 |
FDFIX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +10.97% |
| 1 year | +29.16% |
| 3 years (annualised) | +23.41% |
| 5 years (annualised) | +14.04% |
FDFIX Annual Returns
Calendar-year total returns of Fidelity Flex 500 Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +10.97% |
| 2025 | +17.61% |
| 2024 | +25.04% |
| 2023 | +26.28% |
| 2022 | −18.09% |
| 2021 | +28.69% |
| 2020 | +18.44% |
| 2019 (Sep–Dec) | +11.12% |
FDFIX Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +1.2% | −0.9% | −4.9% | +10.3% | +5.4% | — | — | — | — | — | — | — |
| 2025 | +2.8% | −1.3% | −5.6% | −0.7% | +6.3% | +5.1% | +2.3% | +1.9% | +3.7% | +2.4% | +0.1% | 0.0% |
| 2024 | +1.7% | +5.4% | +3.2% | −4.1% | +4.9% | +3.6% | +1.2% | +2.4% | +2.1% | −0.9% | +5.9% | −2.4% |
| 2023 | +6.3% | −2.5% | +3.7% | +1.6% | +0.4% | +6.6% | +3.2% | −1.6% | −4.8% | −2.1% | +9.2% | +4.5% |
| 2022 | −5.2% | −3.0% | +3.7% | −8.7% | +0.2% | −8.3% | +9.2% | −4.1% | −9.2% | +8.1% | +5.6% | −5.7% |
| 2021 | −1.0% | +2.8% | +4.4% | +5.3% | +0.7% | +2.3% | +2.4% | +3.0% | −4.7% | +7.0% | −0.7% | +4.5% |
| 2020 | 0.0% | −8.2% | −12.4% | +12.8% | +4.8% | +2.0% | +5.7% | +7.2% | −3.8% | −2.7% | +11.0% | +3.8% |
| 2019 | — | — | — | — | — | — | — | — | +1.9% | +2.1% | +3.6% | +3.0% |
FDFIX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 13.27%
- 3-year Sharpe ratio: 1.43 (vs 4.5% risk-free rate)
- Best month: +10.34% (Apr 2026)
- Worst month: −5.62% (Mar 2025)
FDFIX Fund Flows
Monthly money in and out of Fidelity Flex 500 Index Fund, from SEC Form N-PORT.
- 12-month net flow: $1.2B
- 12-month gross sales (incl. reinvestments): $3.2B
- Sales ÷ redemptions: 1.58×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $194.7M | $261.5M | −$66.9M |
| Apr 2026 | $288.0M | $176.6M | $111.4M |
| Mar 2026 | $382.7M | $236.9M | $145.9M |
| Feb 2026 | $247.5M | $110.3M | $137.2M |
| Jan 2026 | $321.5M | $154.0M | $167.5M |
| Dec 2025 | $228.3M | $135.9M | $92.4M |
| Nov 2025 | $164.4M | $120.1M | $44.3M |
| Oct 2025 | $283.4M | $157.0M | $126.4M |
| Sep 2025 | $286.7M | $110.6M | $176.1M |
| Aug 2025 | $259.7M | $96.3M | $163.4M |
| Jul 2025 | $355.1M | $304.2M | $50.9M |
| Jun 2025 | $152.8M | $135.1M | $17.7M |
FDFIX Assets Under Management
Net assets of Fidelity Flex 500 Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $9.20B |
| 2026-02-28 | $8.15B |
| 2025-11-30 | $7.75B |
| 2025-08-31 | $6.98B |
| 2025-05-31 | $6.17B |
| 2025-02-28 | $5.78B |
| 2024-11-30 | $5.70B |
| 2024-08-31 | $5.15B |
| 2024-05-31 | $4.69B |
| 2024-02-29 | $4.35B |
| 2023-11-30 | $3.69B |
| 2023-08-31 | $3.51B |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.