Columbia Mid Cap Index Fund
U.S. stock index fund · tracks S&P MidCap 400 Index
As of its 2026 Q2 report, Columbia Mid Cap Index Fund held 402 positions with $2.54B in net assets. Its ten largest holdings made up 8.8% of the fund. The NTIAX share class costs 0.45% a year. Over the 12 months to May 2026, NTIAX returned 25.3%, with dividends reinvested. In 2026 Q2 it added 9 new positions and exited 9.
Columbia Mid Cap Index Fund (the Fund) seeks total return before fees and expenses that corresponds to the total return of the Standard & Poors (S&P) MidCap 400 Index.
The fund tracks the S&P MidCap 400 Index by holding common stocks in approximately the same weightings as the Index, employing a passive indexing approach and aiming for at least 95% correlation to the Index before fees and expenses. The fund may operate as non-diversified when the Index is non-diversified, allowing it to concentrate a greater percentage of assets in fewer issuers than a diversified fund would permit. Because the fund's weightings depend on the Index composition, performance may diverge from the Index to the extent the fund does not perfectly replicate it.
What you own
| Company | Weight | Value | Shares | Reported price |
|---|---|---|---|---|
Flex Ltd | 1.56% | $39.60M | 262.6K | $150.78 |
COLUMBIA SHORT TERM CASH FUND | 1.28% | $32.50M | — | — |
TWLOTwilio Inc | 0.81% | $20.64M | 108.3K | $190.64 |
TechnipFMC PLC | 0.78% | $19.77M | 288.9K | $68.42 |
0.78% | $19.69M | 26.3K | $747.61 | |
nVent Electric PLC | 0.76% | $19.25M | 115.3K | $166.99 |
0.74% | $18.89M | 21.9K | $860.84 | |
XPOXPO Inc | 0.71% | $17.93M | 83.7K | $214.25 |
0.70% | $17.81M | 224.0K | $79.51 | |
ILMNIllumina Inc | 0.70% | $17.80M | 109.2K | $162.96 |
Reported price is the fund's own reported value divided by its own reported shares at 2026-05-31 — not a live quote, and not what the fund paid.
The 200 largest of 402 holdings, with the share counts as filed, open with a free account.
What the fund is made of
Percentages are of fund net assets. Rounding, liabilities and short positions can make totals differ from 100%.
| Stocks | 98.59% |
| Cash & short-term | 1.28% |
| Derivatives | 0.09% |
Derivatives are shown at market value, not notional exposure.
By sector
- Industrials
- 24.8%
- Information Technology
- 15.5%
- Financials
- 13.9%
- Consumer Discretionary
- 10.5%
- 10 other sectors
- 35.2%
- Industrials
- 24.8%
- Information Technology
- 15.5%
- Financials
- 13.9%
- Consumer Discretionary
- 10.5%
- Health Care
- 8.2%
- Real Estate
- 6.6%
- Materials
- 5.6%
- Energy
- 4.3%
- Utilities
- 3.1%
- Consumer Staples
- 3.1%
- International
- 2.0%
- Cash
- 1.3%
- Communication Services
- 0.9%
- Other
- 0.1%
How it has done
NTIAX share class · total returns with dividends reinvested
Volatility over the last 12 months: 11.18%. Past returns are a record, not a forecast.
The 4 share classes hold the same portfolio
| Share class | Expense ratio | 1 year | 3 years | 5 years | Worst fall |
|---|---|---|---|---|---|
| 0.45% | +25.34% | +59.97% | +44.30% | -14.96% | |
| 0.20% | +25.65% | +61.16% | +46.02% | -14.83% | |
| 0.20% | +25.67% | +61.13% | +46.04% | -14.86% | |
| 0.20% | +25.67% | +61.12% | +46.07% | -14.83% |
These classes hold the same portfolio, so the 1.76pp spread over 5 years is the cost difference between them — roughly 0.35pp a year — not a difference in what they own.
Fees & fund details
Columbia Mid Cap Index Fund is a U.S. equity index fund that tracks the S&P MidCap 400 Index. 18% of NTIAX’s stock holdings are in companies whose revenue grew in the top quartile of U.S. companies over the last five fiscal years (covering 91% of the fund’s equity).
- Asset class
- Equity
- Region
- United States
- Management
- Index (passive)
- Fund type
- Open-end fund
- Features
- Non-diversified
- Expense ratio, by class
- 0.20% – 0.45%· NTIAX 0.45%
- Portfolio turnover
- 16.00% a year · as of 2026 Q2
Net is what a holder pays after the adviser's contractual waiver; gross is before it. A waiver can expire.
Turnover is how much of the portfolio was replaced in a year.
Classified from what the fund holds, not from its name · 2026 Q2. The summary is a paraphrase of the prospectus; the objective is verbatim.
What changed this quarter
Positions that entered or left the fund since its previous filing. Positions that were only resized are not listed.
9 new· the largest 8
9 exited· the largest 8
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