CMDYX — Columbia Mid Cap Index Fund
Data updated: 2026-07-29
CMDYX — Columbia Mid Cap Index Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. United States Mid Cap Blend / Core Equity · $2.54B AUM · 0.20% expense ratio · 17.0% 1-yr return. From SEC regulatory filings.
CMDYX Fund Overview
CMDYX — Columbia Mid Cap Index Fund is a US mutual fund managed by Columbia Funds Series Trust, categorised as United States Mid Cap Blend / Core Equity. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Columbia Funds Series Trust
- Category: United States Mid Cap Blend / Core Equity
- Assets under management: $2.54B
- 1-year return: 17.0%
- Ticker: CMDYX
- SEC CIK: 0001097519
- SEC series ID: S000010826
- Share class ID: C000173200
CMDYX Holdings
Top 10 holdings of Columbia Mid Cap Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Flex Ltd | 1.56% |
| Columbia Short Term Cash Fund | 1.28% |
| Twilio Inc | 0.81% |
| TechnipFMC PLC | 0.78% |
| Curtiss-Wright Corp | 0.77% |
| nVent Electric PLC | 0.76% |
| Sterling Infrastructure Inc | 0.74% |
| XPO Inc | 0.71% |
| Everpure Inc | 0.70% |
| Illumina Inc | 0.70% |
CMDYX Portfolio Allocation
Asset-class allocation of Columbia Mid Cap Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 98.6% |
| Cash & Equivalents | 1.3% |
| Derivatives | 0.1% |
CMDYX Performance
Total returns for CMDYX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 8.3% |
| 1 year | 17.0% |
| 3 years (annualised) | 12.7% |
| 5 years (annualised) | 8.9% |
CMDYX Risk Information
Risk metrics for CMDYX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 10.7%
CMDYX Costs and Fees
CMDYX costs about $20 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.20%
- Gross expense ratio: 0.22%
- Portfolio turnover: 16%
- Brokerage commissions: 0.43 bps of average net assets (SEC N-CEN)
CMDYX Cashflows
Over the 12 months to 2026-02, Columbia Mid Cap Index Fund had net outflows of $94.18M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | −$39.63M |
| 2026-01 | −$42.43M |
| 2025-12 | $93.13M |
| 2025-11 | −$27.26M |
| 2025-10 | −$35.73M |
| 2025-09 | −$49.92M |
CMDYX Debt Constituents
No individual debt constituents are reported in Columbia Mid Cap Index Fund's latest SEC N-PORT filing.
CMDYX Prospectus and SEC Filings
Official Columbia Mid Cap Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other United States Mid Cap Blend / Core Equity funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.