est payments are linked to an official inflation measure (as
measured by the Consumer Price Index for All Urban Consumers, or CPI-U) and the payments are supported by the full faith and credit of the United States. In addition to tracking the performance of the Underlying Index, the Investment Adviser seeks
to minimize portfolio turnover and tax inefficiencies. As of January 31, 2014, there were 11 TIPS in the Underlying Index. The Underlying Index is both capitalization weighted and securities-modified adjusted duration weighted, and its composition
is rebalanced monthly. The Underlying Index is governed by published, objective rules for security selection, exclusion, rebalancing and adjustments, including the daily re-investment of cash flows.
NTI uses a “passive” or indexing
approach to try to achieve the Fund’s investment objective. Unlike many investment companies, the Fund does not try to “beat” the index it tracks and does not seek temporary defensive positions when markets decline or appear
overvalued. NTI generally intends to replicate the constituent securities of the Fund’s Underlying Index. “Replication” is an indexing strategy in which a fund invests in substantially all of the securities in its underlying index
in approximately the same proportions as in the underlying index. NTI may use a “representative sampling” strategy in certain circumstances, such as when it may not be possible or practicable to fully implement a replication strategy.
Representative sampling is investing in a representative sample of securities that collectively has an investment profile similar to the Underlying Index. Securities in the representative sample are expected to have, in the aggregate, investment
characteristics (based on factors such as market capitalization and industry weightings), fundamental characteristics (such as return variability, duration, maturity and yield) and liquidity measures similar to those of the Underlying Index. When
the Fund uses representative sampling, it may or may not hold all of the securities that are included in the Underlying Index. Funds that employ a representative sampling strategy may incur tracking error to a greater extent than a fund that seeks
to replicate an index.
The Fund
generally will invest under normal circumstances at least 80% of its total assets in the securities of the Underlying Index. The Fund may also invest up to 20% of its assets in cash and cash equivalents, including shares of money market funds
advised by NTI or its affiliates, futures contracts, options on futures contracts, options and swaps as well as securities not included in the Underlying Index, but which NTI believes will help the Fund track its Underlying Index.
The Underlying Index is sponsored by Markit
Indices Limited (the “Index Provider”), an organization that is independent of the Fund and NTI. The Index Provider determines the composition and relative weightings of the securities in the Underlying Index and publishes information
regarding the market value of the Underlying Index. Additional information regarding the Index Provider is provided in the “More Information about Underlying Indexes and Index Providers” section of the Prospectus.
The Fund is “non-diversified”
under the Investment Company Act of 1940, as amended, and may invest more of its assets in fewer issuers than “diversified” funds.
Principal Risks
As with any investment, you could lose all or
part of your investment in the Fund, and the Fund’s performance could trail that of other investments. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund’s net asset value
(“NAV”), trading price, yield, total return and ability to meet its investment objective.
Asset Class Risk
is the risk that securities in the Underlying Index or the Fund's portfolio may underperform in comparison to the general securities markets or other asset classes.
Counterparty Risk
is the risk that a counterparty to a financial instrument may default on its payment obligation to the Fund. Such a default may cause the value of an investment in the Fund to decrease.
Derivatives Risk
is the risk of investing in derivative instruments, including liquidity, interest rate, market, credit, counterparty and management risks, as well as the risk of mispricing or improper valuation. Changes in the value of
a derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested.
Income Risk
is
the risk that the Fund's income may decline due to a decline in inflation (or deflation) or due to changes in inflation expectations.
Inflation Protected Security Risk
is the risk that the value of inflation protected securities, such as TIPS, generally will fluctuate in response to changes in real interest rates, generally decreasing when real interest rates rise and increasing when
real interest rates fall. In addition, interest payments on inflation-protected securities will generally vary up or down along with the rate of inflation. Real interest rates are generally measured as a nominal interest less