Investment objective & strategy
As of Dec. 19, 2025 · prospectusObjective. Vanguard S&P Mid-Cap 400 Index Fund (the Fund) seeks to track the performance of a benchmark index that measures the investment return of mid-capitalization stocks in the United States.
Strategy. The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400 Index (the Target Index). The Target Index measures the performance of mid-size companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index. The Fund employs an indexing investment approach designed to track the performance of the S&P MidCap 400 Index (the Target Index). The Target Index measures the performance of mid-size companies in the United States. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index.
Top holdings
As of Feb. 28, 2026 · N-PORT| Security | Ticker | Value | % of fund |
|---|---|---|---|
| LUMENTUM HOLDINGS INC | — | $75.64M | 1.44% |
| COHERENT CORP | — | $61.94M | 1.18% |
| TECHNIPFMC PLC | — | $40.83M | 0.78% |
| CURTISS WRIGHT CORPORATION | — | $39.31M | 0.75% |
| CASEY'S GENERAL | — | $38.80M | 0.74% |
| XPO LOGISTICS INC | — | $37.60M | 0.72% |
| ROYAL GOLD INC | — | $36.97M | 0.70% |
| FLEX LTD | — | $35.47M | 0.68% |
| WOODWARD INC | — | $35.30M | 0.67% |
| ATI INC | — | $33.83M | 0.64% |
Portfolio moves
Nov 30, 2025 → Feb 28, 2026How many positions this fund opened, exited, grew, trimmed, or left unchanged between its two most recent N-PORT snapshots — net changes between point-in-time reports, not a trade log.
Similar funds
Funds whose portfolios most overlap this one, by weight| Fund | Overlap | Net exp. |
|---|---|---|
| S&P MidCap Index Fund · SPMIX, MIDKX | 97% | 0.63% |
| AVIP S&P MidCap 400 Index Portfolio | 94% | 0.40% |
| Mid Cap Index Fund · VMIDX | 93% | 0.35% |
Advisers
| Firm | Role |
|---|---|
| The Vanguard Group, Inc. | Adviser |
Footnotes
- Expense ratio as of December 19, 2025, from the fund's prospectus.
- Net assets and holdings count as of February 28, 2026, from the fund's N-PORT filing.
- Total return for calendar year 2025, before tax and after fund expenses. Computed by compounding the twelve monthly total returns the fund reported in its SEC N-PORT filings for 2025 (the latest prospectus does not yet chart this year).
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