SIMT TAX-MANAGED LARGE CAP FUND (Second Prospectus Summary) | SIMT TAX-MANAGED LARGE CAP FUND

TAX-MANAGED LARGE CAP FUND

Investment Goal

High long-term after-tax returns.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold
Fund shares.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees	SIMT TAX-MANAGED LARGE CAP FUND Class G
Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $50 million within any thirty (30) day period)	0.50%

ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	SIMT TAX-MANAGED LARGE CAP FUND Class G
Management Fees	0.40%
Distribution (12b-1) Fees	0.25%
Other Expenses	0.64%
Total Annual Fund Operating Expenses	1.29%

EXAMPLE

This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same.

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

Expense Example (USD $)	Expense Example, With Redemption, 1 Year	Expense Example, With Redemption, 3 Years	Expense Example, With Redemption, 5 Years	Expense Example, With Redemption, 10 Years
SIMT TAX-MANAGED LARGE CAP FUND Class G	131	409	708	1,556

PORTFOLIO TURNOVER

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 72%
of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Tax-Managed Large Cap Fund will invest at least
80% of its net assets (plus the amount of any borrowings for investment
purposes) in equity securities of large companies, including ETFs and ADRs. For
purposes of this Fund, a large company is a company with a market capitalization
in the range of companies in the Russell 1000 Index (between $117 million and
$406 billion as of December 31, 2011) at the time of purchase. The market
capitalization range and the composition of the Russell 1000 Index are subject
to change. The Fund may also, to a lesser extent, invest in common and preferred
stocks of small capitalization companies. The Fund may invest up to 20%
of its assets in foreign securities.

The Fund uses a multi-manager approach, relying upon a number of
Sub-Advisers to manage portions of the Fund's portfolio under the
general supervision of SIMC. In managing its portion of the Fund's
assets, each Sub-Adviser generally applies either a growth-oriented,
a value-oriented or a blended approach to selecting investments.
Growth-oriented managers generally select stocks they believe have
attractive growth and appreciation potential in light of such
characteristics as revenue and earnings growth, expectations from
sell side analysts and relative valuation, while value-oriented managers
generally select stocks they believe are attractively valued in light
of fundamental characteristics such as earnings, capital structure
and/or return on invested capital.

The Fund seeks to manage the impact of taxes through the use of a
Sub-Adviser that acts as an overlay manager that implements the portfolio
recommendations of the Sub-Advisers. Each Sub-Adviser provides a model
portfolio to the Fund on an ongoing basis that represents that
Sub-Adviser's recommendation as to the securities to be purchased, sold
or retained by the Fund. The overlay manager constructs a portfolio for
the Fund that represents the aggregation of the model portfolios of
the other Sub-Advisers, with the weighting of each Sub-Adviser's model in
the total portfolio determined by SIMC. The overlay manager implements
the portfolio consistent with that represented by the aggregation of the
model portfolios, with limited authority to vary from such aggregation,
primarily for the purpose of seeking efficient tax management of the
Fund's securities transactions. The overlay manager may also, to a lesser
extent, deviate from such aggregation for the purposes of risk management
and transaction cost management. The overlay manager seeks to manage
the impact of taxes by, among other things, selling stocks with the highest
tax cost first, opportunistically harvesting losses and deferring
recognition of taxable gains, where possible.

Principal Risks

Depositary Receipts Risk - Depositary receipts, such as ADRs, are certificates
evidencing ownership of shares of a foreign issuer that are issued by depositary
banks and generally trade on an established market. Depositary receipts are
subject to many of the risks associated with investing directly in foreign
securities, including, among other things, political, social and economic
developments abroad, currency movements and different legal, regulatory and tax
environments.

Equity Market Risk - The risk that stock prices will fall over short or extended
periods of time.

Exchange-Traded Funds (ETFs) Risk - The risks of owning shares of an ETF
generally reflect the risks of owning the underlying securities the ETF is
designed to track, although lack of liquidity in an ETF could result in its
value being more volatile than the underlying portfolio securities.

Foreign Investment Risk - The risk that non-U.S. securities may be subject to
additional risks due to, among other things, political, social and economic
developments abroad, currency movements and different legal, regulatory and tax
environments.

Investment Style Risk - The risk that large capitalization securities may
underperform other segments of the equity markets or the equity markets as a
whole.

Liquidity Risk - The risk that certain securities may be difficult or impossible
to sell at the time and the price that the Fund would like. The Fund may have to
lower the price, sell other securities instead or forego an investment
opportunity, any of which could have a negative effect on Fund management or
performance.

Small Capitalization Risk - Smaller capitalization companies in which the Fund
invests may be more vulnerable to adverse business or economic events than
larger, more established companies. In particular, small capitalization
companies may have limited product lines, markets and financial resources and
may depend upon a relatively small management group. Therefore, small
capitalization stocks may be more volatile than those of larger companies. Small
capitalization stocks may be traded over-the-counter or listed on an exchange.

Taxation Risk - The Fund is managed to minimize tax consequences to investors,
but will likely earn taxable income and gains from time to time.

Loss of money is a risk of investing in the Fund.

Performance Information

As of January 31, 2012, Class G Shares of the Fund had not commenced operations
and did not have a performance history.
  
The bar chart and the performance table below provide some indication of the
risks of investing in the Fund by showing changes in the Fund's performance from
year to year for the past ten calendar years and by showing how the Fund's
average annual returns for 1, 5 and 10 years, and since the Fund's inception,
compared with those of a broad measure of market performance. Since Class G
Shares are invested in the same portfolio of securities, return for Class G
Shares will be substantially similar to those of Class A Shares, shown here, and
will differ only to the extent that Class G Shares have higher expenses. The
Fund's past performance (before and after taxes) is not necessarily an
indication of how the Fund will perform in the future. For current performance
information, please call 1-800-DIAL-SEI.

Best Quarter   Worst Quarter  
   17.35%         -23.05%     
  06/30/09       12/31/08

Average Annual Total Returns (for the periods ended December 31, 2011)

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. Your actual after-tax returns will depend on your tax situation and may
differ from those shown. After-tax returns shown are not relevant to investors
who hold their Fund shares through tax-deferred arrangements, such as
401(k) plans or individual retirement accounts.

Average Annual Total Returns SIMT TAX-MANAGED LARGE CAP FUND	Average Annual Returns, Label	Average Annual Returns, 1 Year	Average Annual Returns, 5 Years	Average Annual Returns, 10 Years	Average Annual Returns, Since Inception	Average Annual Returns, Inception Date
Class G	Class A Return Before Taxes	0.43%	(1.14%)	2.32%	2.30%	Mar. 05, 1998
Class G After Taxes on Distributions	Class A Return After Taxes on Distributions	0.31%	(1.31%)	2.14%	2.10%	Mar. 05, 1998
Class G After Taxes on Distributions and Sales	Class A Return After Taxes on Distributions and Sale of Fund Shares	0.45%	(0.98%)	1.96%	1.92%	Mar. 05, 1998
Russell 1000 Index Return	Russell 1000 Index Return (reflects no deduction for fees, expenses or taxes)	1.50%	(0.02%)	3.34%	3.09%	Mar. 05, 1998	[1]

[1] Index returns are shown from March 31, 1998.