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Virtus Seix U.S. Government Securities Ultra-Short Bond Fund

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The fund has an investment objective of seeking to maximize current income consistent with capital preservation.

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The tables below illustrate the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds. More information on these and other discounts is available: (i) from your financial professional or other financial intermediary; (ii) under “Sales Charges” on page 86 of the fund’s prospectus; and (iii) with respect to purchase of shares through specific intermediaries, in Appendix A to the fund’s prospectus, entitled “Intermediary Sales Charge Discounts and Waivers.”

The Virtus Seix U.S. Government Securities Ultra-Short Bond Fund, a series of Virtus Asset Trust, is the successor of the RidgeWorth Seix U.S. Government Securities Ultra-Short Bond Fund, a series of RidgeWorth Funds (“Predecessor Fund”), resulting from a reorganization of the Predecessor Fund with and into the fund.

Operating Expenses Caption [Optional Text]

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Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Text Block]

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The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 37% of the average value of its portfolio.

Expense Breakpoint Discounts [Text]

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You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds.

Expense Example [Heading]

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Example

Expense Example by, Year, Caption [Text]

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Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy Narrative [Text Block]

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Under normal circumstances, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in short duration U.S. government securities of any credit quality. These securities may include, but are not limited to, U.S. Treasury securities, U.S. agency securities, U.S. agency mortgage-backed securities, repurchase agreements and other U.S. government securities.

The fund expects to maintain an average effective duration between 3 months and 1 year. Duration measures a bond or fund’s sensitivity to interest rate or other changes (such as changes in a bond’s yield) and is expressed as a number of years or days. The higher the number, the greater the risk. Under normal circumstances, for example, if a portfolio has a duration of 5 years, its value will change by 5% if yields change by 1%. Shorter duration bonds generally result in lower expected volatility. Individual purchases will generally be limited to securities with an effective duration of less than 5 years.

In selecting securities for purchase and sale, the subadviser attempts to maximize income by identifying securities that offer an acceptable yield for a given maturity. The fund may use U.S. Treasury securities futures as a vehicle to adjust duration and manage its interest rate exposure.

In addition, to implement its investment strategy, the fund may buy or sell derivative instruments (such as swaps, including credit default swaps, futures and options) to use as a substitute for a purchase or sale of a position in the underlying assets and/or as part of a strategy designed to reduce exposure to other risks, such as interest rate risk. Depending on market conditions the fund’s investment strategies may result in high portfolio turnover.

Bar Chart and Performance Table [Heading]

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Performance Information

Performance Information Illustrates Variability of Returns [Text]

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The fund has adopted the past performance of the Predecessor Fund as its own. The Predecessor Fund and the fund have identical investment objectives and strategies. The bar chart and table below provide some indication of the potential risks of investing in the fund.

Performance Availability Phone [Text]

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800-243-1574

Performance Past Does Not Indicate Future [Text]

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The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

Bar Chart Does Not Reflect Sales Loads [Text]

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Returns do not reflect sales charges applicable to other share classes and would be lower if they did.

Performance Table Heading

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Average Annual Total Returns (for the periods ended 12/31/25; includes returns of the Predecessor Fund)

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.

Performance Table One Class of after Tax Shown [Text]

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After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.

Performance Table Closing [Text Block]

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The Bloomberg U.S. Aggregate Bond Index measures the U.S. investment grade fixed rate bond market. The index is calculated on a total return basis. The index is unmanaged and not available for direct investment.

The Bloomberg U.S. Treasury Bill 3-6 Month Index measures the performance of U.S. Treasury bills with a remaining maturity from 1 up to (but not including) 12 months. It excludes zero coupon strips. The index is calculated on a total return basis. The index is unmanaged and not available for direct investment.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return.