Oct. 31, 2025 | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| U.S. Large Company Portfolio | ETF Class Shares Prospectus | |||||||||||||||||||
| Shareholder Fees (fees paid directly from your investment) | |||||||||||||||||||
| Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | |||||||||||||||||||
| |||||||||||||||||||
| EXAMPLE | |||||||||||||||||||
This Example is meant to help you compare the cost of investing in the Portfolio’s ETF Class shares with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Portfolio’s ETF Class shares for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Portfolio’s operating expenses remain the same. The costs for the Portfolio’s ETF class shares reflect the net expenses of the Portfolio’s ETF Class shares that result from the contractual expense waiver in the first year only. Although your actual costs may be higher or lower, based on these assumptions your costs whether you redeem or hold your shares would be: | |||||||||||||||||||
| |||||||||||||||||||
| |||||||||||||||||||
SUPPLEMENT TO THE STATUTORY
The purpose of this supplement to the Statutory Prospectuses dated February 28, 2026, as amended, of the portfolios listed above (each, a “Portfolio” and collectively, the “Portfolios”), each a series of DFA Investment Dimensions Group Inc. or Dimensional Investment Group Inc. (collectively, the “Funds”), is to notify shareholders that the Boards of Directors of the Funds approved reductions to the Portfolios’ management fees and reduced expense limitation amounts for the DFA Oregon Municipal Bond Portfolio and U.S. Large Company Portfolio, effective as of July 1, 2026, as described below. |