FMDGX Performance — Fidelity Mid Cap Growth Index Fund
Data updated: 2026-09-11
FMDGX returned +7.25% year to date and +6.17% over one year to Jun 2026. Annualised returns are +15.54% over 3 years and +5.99% over 5 years. Against its US Mid-Cap Growth category average the fund came out ahead over three years but behind over one: $100 invested three years ago grew to $154, against $152 for the category, and to $106 over one year, against $118. Volatility over the past three years was 17.77% a year. In the 12 months to Jun 2026 the fund took in a net $931.7M, and assets reached $3.93B.
FMDGX Growth of $100
What $100 invested in Fidelity Mid Cap Growth Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Mid-Cap Growth category average over the same months.
| Period | FMDGX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $106 | $118 |
| 3 years (Jul 2023 – Jun 2026) | $154 | $152 |
| 5 years (Jul 2021 – Jun 2026) | $134 | $129 |
| Since data start (Aug 2019 – Jun 2026) | $209 | $200 |
FMDGX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +7.25% |
| 1 year | +6.17% |
| 3 years (annualised) | +15.54% |
| 5 years (annualised) | +5.99% |
FMDGX Annual Returns
Calendar-year total returns of Fidelity Mid Cap Growth Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +7.25% |
| 2025 | +8.62% |
| 2024 | +22.00% |
| 2023 | +25.79% |
| 2022 | −26.67% |
| 2021 | +12.73% |
| 2020 | +34.87% |
| 2019 (Aug–Dec) | +4.89% |
FMDGX 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 | −0.9% | +0.8% | −6.3% | +6.5% | +4.8% | +2.7% | — | — | — | — | — | — |
| 2025 | +6.4% | −5.7% | −7.4% | +3.3% | +9.6% | +4.4% | +2.0% | +1.0% | −0.3% | −0.3% | −2.1% | −1.3% |
| 2024 | −0.5% | +7.5% | +2.4% | −5.8% | +1.1% | +1.7% | +0.6% | +2.5% | +3.3% | +1.7% | +13.3% | −6.2% |
| 2023 | +8.7% | −1.0% | +1.4% | −1.5% | 0.0% | +7.8% | +3.0% | −3.3% | −4.9% | −5.1% | +12.2% | +7.6% |
| 2022 | −12.9% | −1.2% | +1.6% | −11.2% | −3.9% | −7.5% | +12.3% | −3.3% | −8.5% | +7.9% | +5.4% | −6.0% |
| 2021 | −0.3% | +1.7% | −1.9% | +5.6% | −1.5% | +6.8% | +1.0% | +3.2% | −4.8% | +7.0% | −4.2% | +0.4% |
| 2020 | +1.0% | −6.9% | −15.2% | +15.6% | +10.0% | +2.3% | +8.0% | +2.7% | −1.4% | +0.1% | +13.5% | +4.8% |
| 2019 | — | — | — | — | — | — | — | −1.8% | −1.2% | +1.8% | +4.9% | +1.2% |
FMDGX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 17.77%
- 3-year Sharpe ratio: 0.62 (vs 4.5% risk-free rate)
- Best month: +13.31% (Nov 2024)
- Worst month: −7.43% (Mar 2025)
FMDGX Fund Flows
Monthly money in and out of Fidelity Mid Cap Growth Index Fund, from SEC Form N-PORT.
- 12-month net flow: $931.7M
- 12-month gross sales (incl. reinvestments): $2.6B
- Sales ÷ redemptions: 1.56×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $212.3M | $129.4M | $82.8M |
| May 2026 | $88.1M | $77.2M | $10.9M |
| Apr 2026 | $161.3M | $220.5M | −$59.3M |
| Mar 2026 | $472.4M | $555.9M | −$83.6M |
| Feb 2026 | $169.8M | $83.2M | $86.6M |
| Jan 2026 | $170.0M | $92.9M | $77.0M |
| Dec 2025 | $202.9M | $102.5M | $100.4M |
| Nov 2025 | $141.9M | $70.9M | $71.0M |
| Oct 2025 | $124.1M | $82.4M | $41.6M |
| Sep 2025 | $196.4M | $108.8M | $87.6M |
| Aug 2025 | $364.7M | $53.3M | $311.4M |
| Jul 2025 | $283.0M | $77.9M | $205.0M |
FMDGX Assets Under Management
Net assets of Fidelity Mid Cap Growth Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $3.93B |
| 2026-03-31 | $3.41B |
| 2025-12-31 | $3.58B |
| 2025-09-30 | $3.51B |
| 2025-06-30 | $2.86B |
| 2025-03-31 | $1.96B |
| 2024-12-31 | $1.55B |
| 2024-09-30 | $1.20B |
| 2024-06-30 | $1.14B |
| 2024-03-31 | $977.10M |
| 2023-12-31 | $831.61M |
| 2023-09-30 | $665.06M |
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.