DISCLOSURE

This content is for informational and educational purposes only and not intended as investment advice or a recommendation to buy or sell any security. Investment advice and recommendations can be provided only after careful consideration of an investor's objectives, guidelines, and restrictions.

Performance cited represents past performance. Past performance does not guarantee future results and current performance may be lower or higher than the data quoted. Investment returns and principal will fluctuate with market and economic conditions and you may have a gain or loss when you sell shares. For the most current month-end performance information, please call +1 800 742 7272, or click here. Expense ratios taken from most recent Fund prospectus.

¹ Class N shares are available to the general public without a sales load. Class I shares are available only to investors who meet certain eligibility requirements.

The Macro Allocation Fund involves a high level of risk and may not be appropriate for everyone. You could lose money by investing in the Fund. There can be no assurance that the Fund's investment objective will be achieved. The Fund is not a complete investment program and you should only consider the Fund for the alternative portion of your portfolio. Separate accounts managed by the Advisor may invest in the Fund and, therefore, the Advisor at times may have discretionary authority over a significant portion of the assets invested in the Fund. In such instances, the Advisor's decision to make changes to or rebalance its clients' allocations in the separate accounts may substantially impact the Fund's performance. The Fund is designed for long-term investors.

The Macro Allocation Fund may use investment techniques and financial instruments that may be considered aggressive — including but not limited to the use of futures contracts, options on futures contracts, securities and indices, forward contracts, swap agreements and similar instruments. Such techniques may also include short sales or other techniques that are intended to provide inverse exposure to a particular market or other asset class, as well as leverage. These techniques may expose the Fund to potentially dramatic changes (losses) in the value of certain of its portfolio holdings.

Investments in the Macro Allocation Fund are subject to a number of other different types of risk, including market risk, asset allocation risk, credit risk, commodity risk, counterparty and contractual default risk, currency risk, and derivatives risk. For a more detailed explanation and discussion of these risks, please read the Fund's Prospectus.

The Morningstar Multialternative Category represents the average annual composite performance of all mutual funds listed in the Multialternative Category by Morningstar. Morningstar's Multialternative Category includes a variety of strategies focused on total return across a broad mandate.

Morningstar Rating: The Morningstar Rating TM for funds, or "star rating", is calculated for managed products (including mutual funds, variable annuity and variable life subaccounts, exchange-traded funds, closed-end funds, and separate accounts) with at least a three-year history. Exchange-traded funds and open-ended mutual funds are considered a single population for comparative purposes. It is calculated based on a Morningstar Risk-Adjusted Return measure that accounts for variation in a managed product's monthly excess performance, placing more emphasis on downward variations and rewarding consistent performance. The top 10% of products in each product category receive 5 stars, the next 22.5% receive 4 stars, the next 35% receive 3 stars, the next 22.5% receive 2 stars, and the bottom 10% receive 1 star. The Overall Morningstar Rating for a managed product is derived from a weighted average of the performance figures associated with its three-, five-, and 10-year (if applicable) Morningstar Rating metrics. The weights are: 100% three-year rating for 36-59 months of total returns, 60% five-year rating/40% three-year rating for 60-119 months of total returns, and 50% 10-year rating/30% five-year rating/20% three-year rating for 120 or more months of total returns. While the 10-year overall star rating formula seems to give the most weight to the 10-year period, the most recent three-year period actually has the greatest impact because it is included in all three rating periods. Morningstar Ranking: Morningstar Percentile Rankings are based on the Fund's total return (excluding sales charge) relative to all the funds in the same Morningstar category, where 1 is the highest and 100 is the lowest percentile rank.

© 2018 Morningstar, Inc. All rights reserved. The information contained herein: (1) is proprietary to Morningstar and/or its content providers; (2) may not be copied or distributed; and (3) is not warranted to be accurate, complete, or timely. Neither Morningstar nor its content providers are responsible for any damages or losses arising from any use of this information. Ratings and rankings are one measure of performance. Some of our Funds have experienced negative performance for the time periods shown. For the most current performance, please visit williamblairfunds.com.

Relative Purchasing Power: The exchange rate (currency) finds its fundamental value when it equalizes the prices of goods and services in different countries.

Risk Budget: The range of forward-looking risk that the team takes over time. The investment team seeks to increase the portfolio's overall risk — within the risk budget — when there are a lot of opportunities and decrease the overall risk when there are few opportunities.