SPDR Portfolio S&P 400 Mid Cap ETF (SPMD) Exchange: NYSE ARCA

In seeking to track the performance of the S&P 1000 Index (the “Index”), the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. Based on its analysis of these factors, SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, either may invest the Fund's assets in a subset of securities in the Index or may invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index, as determined by the Adviser to be in the best interest of the Fund in pursuing its objective.Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index. In addition, in seeking to track the Index, the Fund may invest in equity securities that are not included in the Index, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). In seeking to track the Index, the Fund's assets will generally be concentrated in an industry or group of industries to the extent that the Index concentrates in a particular industry or group of industries.The Index measures the performance of the small- and mid-capitalization segments of the U.S. equity market. The Index consists of those stocks in the S&P MidCap 400 Index and S&P SmallCap 600 Index (together, the “Component Indexes”). The selection universe for the Component Indexes includes all U.S. common equities listed on the NYSE, NYSE Arca, NYSE American, NASDAQ Global Select Market, NASDAQ Select Market, Investors Exchange (IEX), NASDAQ Capital Market, Cboe BZX, Cboe BYX, Cboe EDGA or Cboe EDGX exchanges with market capitalizations between $600 million and $8.2 billion. This capitalization range may be revised by the Index Provider (as defined below) from time to time. For purposes of determining Index eligibility, the market capitalization of an issuer is evaluated in the context of such issuer's short- and medium-term historical market capitalization trends, as well as those of its industry. To be added as a constituent of the Index, a security (or issuer of a security, as applicable) must: (i) have an annual dollar value traded to float adjusted market capitalization ratio of 1.00 or greater; (ii) trade a minimum of 250,000 shares in each of the preceding six months; (iii) have a public float of at least 10% of the total market capitalization; and (iv) have positive earnings (i.e. Generally Accepted Accounting Principles (GAAP) net income excluding discontinued operations and extraordinary items) for the sum of the most recent four consecutive quarters and for the most recent quarter. In determining eligibility for Index inclusion, the Index Provider also attempts to maintain sector balance, as measured by a comparison of the weight of each GICS (Global Industry Classification Standard) sector's weight in the Index to such sector's weight in the S&P Total Market Index, in the relevant market capitalization range.The Index is float-adjusted and market capitalization weighted. Index constituents may be removed from the Index if they are in violation of one or more of the Index eligibility criteria described above. Changes are made to the Index on an as-needed basis. As of August 31, 2019, a significant portion of the Fund comprised companies in the financial, industrial and technology sectors, although this may change from time to time. As of August 31, 2019, the Index comprised 1,001 stocks.The Index is sponsored by S&P Dow Jones Indices LLC (the “Index Provider”), which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.