Vanguard Total Stock Market Index Fund
Supplement Dated October 25, 2024, to the Prospectus and Summary Prospectus Dated April 26, 2024
Important Changes to Vanguard Total Stock Market Index Fund (the Fund)
In accordance with approval granted by the Fund’s Board of Trustees, the Fund has revised its diversification policy under the Investment Company Act of 1940. Under the revised policy, the Fund will continue to track its target index even if the Fund becomes nondiversified as a result of an index rebalance or market movement.
Shareholder approval will not be sought if the Fund crosses from diversified to nondiversified status under such circumstances.
Prospectus and Summary Prospectus Text Changes
The following are added under the heading “Principal Investment Strategies”:
The Fund may become nondiversified, as defined under the Investment Company Act of 1940, solely as a result of an index rebalance or market movement.
The following is added under the heading “Principal Risks”:
• Nondiversification risk. Because the Fund seeks to closely track the composition of the Fund’s target index, from time to time, more than 25% of the Fund’s total assets may be invested in issuers representing more than 5% of the Fund’s total assets due to an index rebalance or market movement, which would result in the Fund being nondiversified under the Investment Company Act of 1940. The Fund’s performance may be hurt disproportionately by the poor performance of relatively few stocks, or even a single stock, and the Fund’s shares may experience significant fluctuations in value.
• Sector risk, which is the change that significant problems will affect a particular sector, or that returns from that sector will trail returns from the overall stock market. Daily fluctuations in specific market sectors are often more extreme or volatile than fluctuations in the overall market. Because a significant portion of the Fund’s assets are invested in the information
