CMDYX Performance — Columbia Mid Cap Index Fund, Institutional 3 Class
Data updated: 2026-07-29
CMDYX returned +13.17% year to date and +25.67% over one year to May 2026. Annualised returns are +17.23% over 3 years and +7.87% over 5 years. The fund beat its US Mid-Cap Blend category average: $100 invested three years ago grew to $161, against $156 for the category, and to $126 over one year, against $122. Volatility over the past three years was 16.46% a year. In the 12 months to May 2026 the fund lost a net $250.2M, and assets reached $2.54B.
CMDYX Growth of $100
What $100 invested in Columbia Mid Cap Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Mid-Cap Blend category average over the same months.
| Period | CMDYX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $126 | $122 |
| 3 years (Jun 2023 – May 2026) | $161 | $156 |
| 5 years (Jun 2021 – May 2026) | $146 | $143 |
| Since data start (Sep 2019 – May 2026) | $217 | $204 |
CMDYX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +13.17% |
| 1 year | +25.67% |
| 3 years (annualised) | +17.23% |
| 5 years (annualised) | +7.87% |
CMDYX Annual Returns
Calendar-year total returns of Columbia Mid Cap Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +13.17% |
| 2025 | +7.32% |
| 2024 | +13.70% |
| 2023 | +16.24% |
| 2022 | −13.22% |
| 2021 | +24.48% |
| 2020 | +13.36% |
| 2019 (Sep–Dec) | +10.30% |
CMDYX 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 | +4.0% | +4.1% | −5.4% | +7.9% | +2.5% | — | — | — | — | — | — | — |
| 2025 | +3.9% | −4.4% | −5.5% | −2.3% | +5.4% | +3.5% | +1.6% | +3.4% | +0.4% | −0.5% | +2.0% | +0.1% |
| 2024 | −1.8% | +5.9% | +5.6% | −6.0% | +4.4% | −1.6% | +5.8% | −0.1% | +1.1% | −0.7% | +8.8% | −7.1% |
| 2023 | +9.2% | −1.8% | −3.3% | −0.8% | −3.2% | +9.2% | +4.1% | −3.0% | −5.3% | −5.3% | +8.6% | +8.7% |
| 2022 | −7.2% | +1.1% | +1.3% | −7.1% | +0.7% | −9.6% | +10.8% | −3.1% | −9.2% | +10.5% | +6.1% | −5.5% |
| 2021 | +1.4% | +6.8% | +4.6% | +4.5% | +0.2% | −1.1% | +0.3% | +1.9% | −4.0% | +5.9% | −3.0% | +5.0% |
| 2020 | −2.6% | −9.6% | −20.3% | +14.2% | +7.4% | +1.2% | +4.6% | +3.5% | −3.3% | +2.2% | +14.3% | +6.5% |
| 2019 | — | — | — | — | — | — | — | — | +3.1% | +1.1% | +2.9% | +2.8% |
CMDYX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 16.46%
- 3-year Sharpe ratio: 0.77 (vs 4.5% risk-free rate)
- Best month: +9.15% (Jun 2023)
- Worst month: −7.14% (Dec 2024)
CMDYX Fund Flows
Monthly money in and out of Columbia Mid Cap Index Fund, from SEC Form N-PORT.
- 12-month net flow: −$250.2M
- 12-month gross sales (incl. reinvestments): $595.9M
- Sales ÷ redemptions: 0.70×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $23.7M | $54.8M | −$31.1M |
| Apr 2026 | $33.6M | $79.2M | −$45.7M |
| Mar 2026 | $32.1M | $100.0M | −$68.0M |
| Feb 2026 | $25.2M | $64.9M | −$39.6M |
| Jan 2026 | $35.5M | $77.9M | −$42.4M |
| Dec 2025 | $167.0M | $73.9M | $93.1M |
| Nov 2025 | $26.4M | $53.7M | −$27.3M |
| Oct 2025 | $43.7M | $79.5M | −$35.7M |
| Sep 2025 | $59.8M | $109.8M | −$49.9M |
| Aug 2025 | $25.8M | $41.8M | −$16.0M |
| Jul 2025 | $26.2M | $61.4M | −$35.2M |
| Jun 2025 | $96.9M | $49.2M | $47.7M |
CMDYX Assets Under Management
Net assets of Columbia Mid Cap Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $2.54B |
| 2026-02-28 | $2.58B |
| 2025-11-30 | $2.52B |
| 2025-08-31 | $2.58B |
| 2025-05-31 | $2.44B |
| 2025-02-28 | $2.50B |
| 2024-11-30 | $2.80B |
| 2024-08-31 | $2.66B |
| 2024-05-31 | $2.67B |
| 2024-02-29 | $2.63B |
| 2023-11-30 | $2.44B |
| 2023-08-31 | $2.55B |
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.