NUVEEN TAX EXEMPT UNIT TRUST SERIES 726
497, 1994-04-25
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     NATIONAL
     INSURED
     TRUST 268
 
            Estimated Current Return
            First
            Year: 5.78% to 6.01%
            Subsequent
            Years: 5.81% to 6.04%
            as of 04/21/94
 
            Estimated Long Term Return
            5.82% to 6.05%
             100,000 units in a
             diversified $10,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101X 617 Monthly Payment Option
                  67101X 625 Quarterly Payment Option
                  67101X 633 Semi-Annual Payment Option
 
                  Registered in all states
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, NATIONAL INSURED TRUST 268
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 22, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $1,000,000    Board of Governors of State Colleges and Universities,             2004 at 102          AAA           Aaa
                  Chicago State University (Illinois), Auxiliary Facilities
                  System Revenue Bonds, Series 1994, 6.15% Due 12/1/23.
                  (When issued.)
   1,000,000    Illinois Health Facilities Authority, Revenue Bonds, Series        2004 at 102          AAA           Aaa
                  1994 (Southern Illinois Hospital Services), 5.90% Due
                  3/1/20.
   1,000,000    Clark-Pleasant Multi School Building Corporation (Johnson          2004 at 102          AAA           Aaa
                  County, Indiana), First Mortgage Bonds, Series 1994, 6.45%
                  Due 1/15/17. (General Obligation Bonds.) (When issued.)
   1,000,000    County of Boone, Kentucky, Collateralized Pollution Control        2002 at 102          AAA           Aaa
                  Revenue Refunding Bonds, 1992 Series A (The Dayton Power
                  and Light Company Project), 6.50% Due 11/15/22.
     250,000    Massachusetts Health and Educational Facilities Authority,         2002 at 102          AAA           Aaa
                  Revenue Bonds, South Shore Hospital Issue, Series D, 6.50%
                  Due 7/1/22.
     500,000    Tulsa Industrial Authority (Oklahoma), Hospital Revenue            2004 at 102          AAA           Aaa
                  Bonds (St. John Medical Center Project), Series 1994A,
                  6.25% Due 2/15/17. (When issued.)
   1,000,000    Pennsylvania Intergovernmental Cooperation Authority,              2003 at 100          AAA           Aaa
                  Special Tax Revenue Bonds (City of Philadelphia Funding
                  Program), Series of 1993, 5.625% Due 6/15/23.
     250,000    Allegheny County Hospital Development Authority                    2002 at 100          AAA           Aaa
                  (Pennsylvania), Health Center Revenue Bonds, Series 1992A
                  (Presbyterian University Health System, Inc. Project),
                  6.25% Due 11/1/23.
   1,000,000    Lehigh County Industrial Development Authority                     2002 at 102          AAA           Aaa
                  (Pennsylvania), Pollution Control Revenue Refunding Bonds,
                  1992 Series A (Pennsylvania Power & Light Company
                  Project), 6.40% Due 11/1/21.
   1,000,000    Matagorda County Navigation District Number One (Texas),           2003 at 102          AAA           Aaa
                  Pollution Control Revenue Refunding Bonds (Central Power
                  and Light Company Project), Series 1993, 6.00% Due 7/1/28.
   1,000,000    Municipality of Metropolitan Seattle (Seattle, Washington),        2003 at 102          AAA           Aaa
                  Sewer Revenue Bonds, Series W, 6.30% Due 1/1/33.
   1,000,000    Wisconsin Health and Educational Facilities Authority,             2003 at 102          AAA           Aaa
                  Revenue Bonds (Sisters of the Sorrowful Mother-Ministry
                  Corporation), Series 1993A, 6.125% Due 8/15/22.
  ----------
  $10,000,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              Estimated Current Return (2)
          AMOUNT PURCHASED                         Public      -----------------------------------------------------------
- -------------------------------------  Sales      Offering         Monthly           Quarterly            Semi-Annual
     Units              Dollars        Charge     Price (1)        Payment            Payment               Payment
- ----------------  -------------------  ------    -----------   ---------------    ---------------    ---------------------
<S>               <C>                  <C>       <C>           <C>       <C>      <C>       <C>      <C>       <C>
50-499                 $5,000-$49,999   4.90 %   $    102.79     (5.78%)  5.81%     (5.81%)  5.84%     (5.83%)  5.86%
500-999                 50,000-99,999   4.75          102.62     (5.79)   5.82      (5.82)   5.85      (5.84)   5.87
1,000-2,499           100,000-249,999   4.50          102.36     (5.81)   5.83      (5.84)   5.86      (5.86)   5.88
2,500-4,999           250,000-499,999   4.25          102.09     (5.82)   5.85      (5.85)   5.88      (5.87)   5.90
5,000-9,999           500,000-999,999   3.50          101.30     (5.87)   5.89      (5.90)   5.93      (5.92)   5.94
10,000-24,999     1,000,000-2,499,999   3.00          100.77     (5.90)   5.93      (5.93)   5.96      (5.95)   5.98
25,000-49,999     2,500,000-4,999,999   2.50          100.26     (5.93)   5.96      (5.96)   5.99      (5.98)   6.01
50,000 and over    5,000,000 and over   2.00           99.75     (5.96)   5.99      (5.99)   6.02      (6.01)   6.04
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    102.79          5.82    %        5.86    %        5.87    %
500-999                 50,000-99,999   4.75          102.62          5.83             5.86             5.87
1,000-2,499           100,000-249,999   4.50          102.36          5.85             5.88             5.89
2,500-4,999           250,000-499,999   4.25          102.09          5.86             5.90             5.91
5,000-9,999           500,000-999,999   3.50          101.30          5.91             5.94             5.95
10,000-24,999     1,000,000-2,499,999   3.00          100.77          5.94             5.98             5.99
25,000-49,999     2,500,000-4,999,999   2.50          100.26          5.97             6.01             6.02
50,000 and over    5,000,000 and over   2.00           99.75          6.00             6.04             6.05
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
National Insured Trust                                   1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6466(1)                                                               $  5.9710
                                                             --------    $.4974 every month    --------
Quarterly Distribution Plan...........  $   .6466(1)   $  1.0002(2)   $  1.5003      $  1.5003      $  1.5003      $  6.0030
Semi-Annual Distribution Plan.........  $   .6466(1)                  $  2.5080(3)                  $  3.0096      $  6.0220
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.12 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01658 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$0.6466 per unit for the 39-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 06/01/94 is $.6466 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01658              Quarterly - $0.01667
                             Semi-Annual - $0.01672
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
<PAGE>
- -------------------------------------------------
 
DIVERSIFICATION OF PORTFOLIO INCOME
 
There are 12 Tax-exempt bond issues in this trust; this diversified portfolio
yields current income from issuers in 9 states.
- -------------------------------------------------
<TABLE>
<CAPTION>
                   Percent
                   of Total
                   Income
<S>                    <C>        <C>
- ------------------------
                                  %
Illinois                    19.5
Indiana                     10.4
Kentucky                    10.5
Massachusetts                2.6
Oklahoma                     5.1
 
<CAPTION>
                   Percent
                   of Total
                   Income
- ------------------------
<S>                    <C>        <C>
                                  %
Pennsylvania                22.1
Texas                        9.7
Washington                  10.2
Wisconsin                    9.9
</TABLE>
 
- -------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 29.0 years.
The first bond is scheduled to mature in January, 2017, with the last bond
maturity being January, 2033.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
 
726
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     SHORT INTERMEDIATE
     INSURED
     TRUST 30
 
            Estimated Current Return
            4.56% to 4.68%
            as of 04/21/94
 
            Estimated Long Term Return
            4.63% to 4.75%
             100,000 units in a
             diversified $10,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6710A0 197 Monthly Payment Option
                  6710A0 205 Quarterly Payment Option
                  6710A0 213 Semi-Annual Payment Option
 
                  Registered in all states
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Los Angeles
New York, New York 10022      Philadelphia
Telephone: 212.207.2000       Phoenix
                              San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, SHORT INTERMEDIATE INSURED TRUST 30
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 22, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $1,000,000    North Slope Borough, Alaska, General Obligation Bonds,             No Optional          AAA           Aaa
                  Series 1992A, 4.85% Due 6/30/98.                                    Call
   1,000,000    District of Columbia (Washington, D.C.), General Obligation        No Optional          AAA           Aaa
                  Refunding Bonds, Series 1993C, 4.90% Due 12/1/98.                   Call
   1,000,000    State of Florida, Department of Environmental Protection,          No Optional          AAA           Aaa
                  Preservation 2000 Revenue Bonds, Series 1994A, 4.30% Due            Call
                  7/1/98.
   1,000,000    City of Chicago, Illinois, Water Revenue Bonds, Refunding          No Optional          AAA           Aaa
                  Series 1992, 4.90% Due 11/1/98.                                     Call
   1,000,000    The Turnpike Authority of Kentucky, Economic Development           No Optional          AAA           Aaa
                  Road Revenue Refunding Bonds (Revitalization Projects),             Call
                  Series 1992, 5.375% Due 1/1/00.
   1,000,000    Southfield Public Schools, Oakland County, Michigan, School        No Optional          AAA           Aaa
                  Facilities Bonds, Series 1994, 4.75% Due 5/1/99. (General           Call
                  Obligation Bonds.) (When issued.)
   1,000,000    Charter County of Wayne, Michigan, Airport Revenue Refunding       No Optional          AAA           Aaa
                  Bonds (Detroit Metropolitan Wayne County Airport), Series           Call
                  1994A, 4.95% Due 12/1/99. (When issued.)
   1,500,000    Las Vegas Valley Water District, Nevada, General Obligation,       No Optional          AAA           Aaa
                  Water Improvement and Refunding Bonds, Series 9/1/92,               Call
                  5.20% Due 9/1/99.
     500,000    Tulsa Industrial Authority (Oklahoma), Hospital Revenue            No Optional          AAA           Aaa
                  Bonds (St. John Medical Center Project), Series 1994A,              Call
                  5.10% Due 2/15/99. (When issued.)
   1,000,000    Dallas-Fort Worth International Airport (Texas), Dal-              No Optional          AAA           Aaa
                  las-Fort Worth Regional Airport, Joint Revenue Refunding            Call
                  Bonds, Series 1993, 4.50% Due 11/1/99.
  ----------
  $10,000,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   3.00 %   $    102.81          4.56%            4.60%            4.61%
500-999                 50,000-99,999   2.80          102.60          4.57             4.60             4.62
1,000-2,499           100,000-249,999   2.60          102.39          4.58             4.61             4.63
2,500-4,999           250,000-499,999   2.35          102.13          4.59             4.63             4.64
5,000-9,999           500,000-999,999   2.10          101.87          4.61             4.64             4.66
10,000-24,999     1,000,000-2,499,999   1.85          101.61          4.62             4.65             4.67
25,000-49,999     2,500,000-4,999,999   1.80          101.56          4.62             4.65             4.67
50,000 and over    5,000,000 and over   1.50          101.25          4.63             4.67             4.68
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   3.00 %   $    102.81          4.63    %        4.66    %        4.68    %
500-999                 50,000-99,999   2.80          102.60          4.64             4.67             4.69
1,000-2,499           100,000-249,999   2.60          102.39          4.65             4.68             4.70
2,500-4,999           250,000-499,999   2.35          102.13          4.66             4.69             4.70
5,000-9,999           500,000-999,999   2.10          101.87          4.67             4.70             4.72
10,000-24,999     1,000,000-2,499,999   1.85          101.61          4.68             4.71             4.73
25,000-49,999     2,500,000-4,999,999   1.80          101.56          4.68             4.71             4.73
50,000 and over    5,000,000 and over   1.50          101.25          4.70             4.73             4.75
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Short Intermediate Insured Trust                         1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .5081(1)                                                               $  4.6923
                                                             --------    $.3909 every month    --------
Quarterly Distribution Plan...........  $   .5081(1)   $   .7872(2)   $  1.1808      $  1.1808      $  1.1808      $  4.7243
Semi-Annual Distribution Plan.........  $   .5081(1)                  $  1.9755(3)                  $  2.3706      $  4.7433
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.09 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01303 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$0.5081 per unit for the 39-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 06/01/94 is $.5081 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01303              Quarterly - $0.01312
                             Semi-Annual - $0.01317
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
<PAGE>
- -------------------------------------------------
 
DIVERSIFICATION OF PORTFOLIO INCOME
 
There are 10 Tax-exempt bond issues in this trust; this diversified portfolio
yields current income from issuers in 8 states and the District of Columbia.
- -------------------------------------------------
<TABLE>
<CAPTION>
                   Percent
                   of Total
                   Income
<S>                    <C>        <C>
- ------------------------
                                  %
Alaska                       9.9
Washington D.C.             10.0
Florida                      8.8
Illinois                    10.0
Kentucky                    11.0
 
<CAPTION>
                   Percent
                   of Total
                   Income
- ------------------------
<S>                    <C>        <C>
                                  %
Michigan                    19.9
Nevada                      16.0
Oklahoma                     5.2
Texas                        9.2
</TABLE>
 
- -------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 5.0 years.
 
<TABLE>
<CAPTION>
Year Bonds Mature                        Amount      Percent
- -------------------------------------  ----------  -----------
<S>                                    <C>         <C>
1998.................................       4,000        40.0%
1999.................................       5,000        50.0
2000.................................       1,000        10.0
</TABLE>
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
 
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
 
726
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     ARIZONA
     INSURED
     TRUST 32
 
            Estimated Current Return
            First
            Year: 5.54% to 5.76%
            Subsequent
            Years: 5.58% to 5.80%
            as of 04/21/94
 
            Estimated Long Term Return
            5.64% to 5.86%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101J 253 Monthly Payment Option
                  67101J 261 Quarterly Payment Option
                  67101J 279 Semi-Annual Payment Option
 
                  Registered in Arizona
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, ARIZONA INSURED TRUST 32
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 22, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    Central Arizona Water Conservation District (Central Arizona       No Optional          AAA           Aaa
                  Project), Contract Revenue Refunding Bonds, Series A 1993,          Call
                  5.50% Due 11/1/10.
     350,000    City of Peoria, Arizona, General Obligation Bonds (Projects        2002 at 101          AAA           Aaa
                  of 1990), Series 1994,
                240M-6.40% Due 7/1/10,
                110M-6.40% Due 7/1/11.
                  (When issued.)
     500,000    Peoria Municipal Development Authority, Inc. (Arizona),            2002 at 101          AAA           Aaa
                  Municipal Facilities (Utilities) Revenue Bonds, Series
                  1994, 5.75% Due 7/1/14. (Original issue discount bonds
                  will be delivered on or about May 4, 1994 at a price of
                  94.852% of principal amount.)(When issued.)
     500,000    City of Phoenix (Arizona), Civic Improvement Corporation,          2004 at 102          AAA           Aaa
                  Junior Lien Water System Revenue Bonds, Series 1994, 5.50%
                  Due 7/1/24.
     500,000    City of Phoenix, Arizona, Junior Lien Street and Highway           2002 at 102          AAA           Aaa
                  User Revenue Refunding Bonds, Series 1992, 6.25% Due
                  7/1/11. (Original issue discount bonds delivered on or
                  about April 21, 1992 at a price of 94.344% of principal
                  amount.)
     500,000    Salt River Project Agricultural Improvement and Power              2002 at 100          AAA           Aaa
                  District, Arizona, Salt River Project Electric System
                  Revenue Bonds, 1992 Series D, 5.50% Due 1/1/25. (Original
                  issue discount bonds delivered on or about July 30, 1992
                  at a price of 89.90% of principal amount.)
     525,000    City of Tucson, Arizona, General Obligation Bonds, Series          2004 at 101          AAA           Aaa
                  1984-G (1994), 6.25% Due 7/1/18. (When issued.)
     125,000    Commonwealth of Puerto Rico, Public Improvement Refunding          2002 at 101          AAA           Aaa
                  Bonds, Series 1992A (General Obligation Bonds.), 6.25% Due           1/2
                  7/1/10.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                              Estimated Current Return (2)
          AMOUNT PURCHASED                         Public      -----------------------------------------------------------
- -------------------------------------  Sales      Offering         Monthly           Quarterly            Semi-Annual
     Units              Dollars        Charge     Price (1)        Payment            Payment               Payment
- ----------------  -------------------  ------    -----------   ---------------    ---------------    ---------------------
<S>               <C>                  <C>       <C>           <C>       <C>      <C>       <C>      <C>       <C>
50-499                 $5,000-$49,999   4.90 %   $    101.20     (5.54%)  5.58%     (5.57%)  5.61%     (5.59%)  5.63%
500-999                 50,000-99,999   4.75          101.04     (5.55)   5.59      (5.58)   5.62      (5.60)   5.64
1,000-2,499           100,000-249,999   4.50          100.78     (5.56)   5.60      (5.59)   5.63      (5.61)   5.65
2,500-4,999           250,000-499,999   4.25          100.51     (5.58)   5.62      (5.61)   5.65      (5.63)   5.67
5,000-9,999           500,000-999,999   3.50           99.73     (5.62)   5.66      (5.65)   5.69      (5.67)   5.71
10,000-24,999     1,000,000-2,499,999   3.00           99.22     (5.65)   5.69      (5.68)   5.72      (5.70)   5.74
25,000-49,999     2,500,000-4,999,999   2.50           98.71     (5.68)   5.72      (5.71)   5.75      (5.73)   5.77
50,000 and over    5,000,000 and over   2.00           98.20     (5.71)   5.75      (5.74)   5.78      (5.76)   5.80
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $    101.20          5.64    %        5.67    %        5.69    %
500-999                 50,000-99,999   4.75          101.04          5.65             5.67             5.69
1,000-2,499           100,000-249,999   4.50          100.78          5.66             5.69             5.71
2,500-4,999           250,000-499,999   4.25          100.51          5.68             5.70             5.72
5,000-9,999           500,000-999,999   3.50           99.73          5.72             5.75             5.77
10,000-24,999     1,000,000-2,499,999   3.00           99.22          5.75             5.78             5.80
25,000-49,999     2,500,000-4,999,999   2.50           98.71          5.78             5.81             5.83
50,000 and over    5,000,000 and over   2.00           98.20          5.81             5.84             5.86
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to the Date of Deposit. Figures in
    brackets represent the current return. The first year's estimated current
    returns are slightly lower than those for subsequent years because a portion
    of the monies received in the first year only will be treated as a return of
    principal due to the inclusion in the portfolio of "when issued" or other
    Bonds having delivery dates after the date of settlement for a purchase made
    on the Date of Deposit.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
Arizona Insured Trust                                    1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .6115(1)                                                               $  5.6462
                                                             --------    $.4704 every month    --------
Quarterly Distribution Plan...........  $   .6115(1)   $   .9462(2)   $  1.4193      $  1.4193      $  1.4193      $  5.6782
Semi-Annual Distribution Plan.........  $   .6115(1)                  $  2.3730(3)                  $  2.8476      $  5.6972
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.09 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01568 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$0.6115 per unit for the 39-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 06/01/94 is $.6115 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01568              Quarterly - $0.01577
                             Semi-Annual - $0.01582
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          726
<PAGE>
- -------------------------------------------------------
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 22.3 years.
The first bond is scheduled to mature in July, 2010, with the last bond maturity
being January, 2025.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     CALIFORNIA
     INSURED
     TRUST 224
 
            Estimated Current Return
            5.55% to 5.78%
            as of 04/21/94
 
            Estimated Long Term Return
            5.70% to 5.93%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67064U 196 Monthly Payment Option
                  67064U 204 Quarterly Payment Option
                  67064U 212 Semi-Annual Payment Option
 
                  Registered in California
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, CALIFORNIA INSURED TRUST 224
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 22, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  500,000    California Health Facilities Financing Authority, Kaiser           2003 at 102          AAA           Aaa
                  Permanente, Revenue Bonds, 1993 Series C, 5.60% Due
                  5/1/33.
     500,000    State Public Works Board of the State of California, Lease         2002 at 102          AAA           Aaa
                  Revenue Bonds (Department of Corrections), 1993 Series D
                  (California State Prison-Lassen County, Susanville),
                  5.375% Due 6/1/18.
     500,000    The Regents of the University of California, University of         2003 at 102          AAA           Aaa
                  California Housing System Revenue Bonds, Series A, 5.50%
                  Due 11/1/18.
     500,000    The City of Los Angeles (California), Wastewater System            2003 at 102          AAA           Aaa
                  Revenue Bonds, Series 1993-B, 5.70% Due 6/1/23.
     500,000    Department of Water and Power of the City of Los Angeles,          2003 at 102          AAA           Aaa
                  California, Electric Plant Refunding Revenue Bonds, Issue
                  of 1993, 5.875% Due 9/1/30.
     500,000    City of Stockton (California), Insured Health Facilities           2003 at 102          AAA           Aaa
                  Revenue Bonds (St. Joseph's Medical Center of Stockton),
                  Series 1993A, 5.50% Due 6/1/23.
     500,000    City of Walnut Creek, California, Certificates of                  2004 at 102          AAA           Aaa
                  Participation, Refunding Series 1994 (John Muir Medical
                  Center), 5.00% Due 2/15/20. (Original issue discount bonds
                  delivered on or about February 17, 1994 at a price of
                  94.047% of principal amount.)
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $     95.08          5.55%            5.59%            5.61%
500-999                 50,000-99,999   4.75           94.93          5.56             5.60             5.62
1,000-2,499           100,000-249,999   4.50           94.68          5.58             5.61             5.63
2,500-4,999           250,000-499,999   4.25           94.43          5.59             5.63             5.65
5,000-9,999           500,000-999,999   3.50           93.70          5.64             5.67             5.69
10,000-24,999     1,000,000-2,499,999   3.00           93.22          5.66             5.70             5.72
25,000-49,999     2,500,000-4,999,999   2.50           92.74          5.69             5.73             5.75
50,000 and over    5,000,000 and over   2.00           92.27          5.72             5.76             5.78
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     95.08          5.70    %        5.74    %        5.75    %
500-999                 50,000-99,999   4.75           94.93          5.70             5.74             5.76
1,000-2,499           100,000-249,999   4.50           94.68          5.72             5.76             5.78
2,500-4,999           250,000-499,999   4.25           94.43          5.73             5.77             5.79
5,000-9,999           500,000-999,999   3.50           93.70          5.78             5.82             5.84
10,000-24,999     1,000,000-2,499,999   3.00           93.22          5.81             5.85             5.87
25,000-49,999     2,500,000-4,999,999   2.50           92.74          5.84             5.88             5.90
50,000 and over    5,000,000 and over   2.00           92.27          5.87             5.91             5.93
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
California Insured Trust                                 1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .5717(1)                                                               $  5.2801
                                                             --------    $.4398 every month    --------
Quarterly Distribution Plan...........  $   .5717(1)   $   .8850(2)   $  1.3275      $  1.3275      $  1.3275      $  5.3121
Semi-Annual Distribution Plan.........  $   .5717(1)                  $  2.2200(3)                  $  2.6640      $  5.3311
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.10 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01466 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$0.5717 per unit for the 39-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 06/01/94 is $.5717 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01466              Quarterly - $0.01475
                             Semi-Annual - $0.01480
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          726
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 29.7 years.
The first bond is scheduled to mature in June, 2018, with the last bond maturity
being May, 2033.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     NEW YORK
     INSURED
     TRUST 216
 
            Estimated Current Return
            5.55% to 5.77%
            as of 04/21/94
 
            Estimated Long Term Return
            5.64% to 5.86%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H5 551 Monthly Payment Option
                  6706H5 569 Quarterly Payment Option
                  6706H5 577 Semi-Annual Payment Option
 
                  Registered in New York, Connecticut & Florida
                    John Nuveen & Co. Incorporated
                    Investment Bankers
 
<TABLE>
<S>                           <C>
Chicago:                      Atlanta
333 W. Wacker Dr.             Austin
Chicago, Illinois 60606       Boca Raton
Telephone: 312.917.7700       Boston
                              Columbus
New York:                     Dallas/Ft. Worth
Swiss Bank Tower              Irvine
10 East 50th Street           Philadelphia
New York, New York 10022      Phoenix
Telephone: 212.207.2000       San Francisco
                              Seattle
                              Tampa
                              Washington, D.C.
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
 
NUVEEN TAX-EXEMPT UNIT TRUST--INSURED, NEW YORK INSURED TRUST 216
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT APRIL 22, 1994
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                             Ratings
                                                                                    Optional         -----------------------
  Aggregate            Name of Issuer and Title of Issue Represented               Redemption        Standard
  Principal               by Sponsor's Contracts to Purchase Bonds                 Provisions        & Poor's       Moody's
  <C>       <C> <S>                                                              <C>                 <C>           <C>
  --------------------------------------------------------------------------------------------------------------------------
  $  525,000    Dormitory Authority of the State of New York, Revenue Bonds,       2004 at 102          AAA           Aaa
                  Upstate Community Colleges, Series 1994A, 5.70% Due
                  7/1/21.
     380,000    New York State Energy Research and Development Authority,          2003 at 102          AAA           Aaa
                  Facilities Refunding Revenue Bonds, Series 1993B
                  (Consolidated Edison Company of New York, Inc. Project),
                  5.25% Due 8/15/20.
     500,000    New York Local Government Assistance Corporation (A Public         2004 at 101          AAA           Aaa
                  Benefit Corporation of the State of New York), Series                1/2
                  1994A Bonds, 5.50% Due 4/1/23.
     440,000    New York State Medical Care, Facilities Finance Agency,            2003 at 102          AAA           Aaa
                  Mental Health Services Facilities Improvement Revenue
                  Bonds, 1993 Series A, 5.80% Due 8/15/22. (General
                  Obligation Bonds.)
     130,000    New York State Urban Development Corporation, Correctional         2004 at 102          AAA           Aaa
                  Facilities Revenue Bonds, 1993A Refunding Series, 5.50%
                  Due 1/1/16.
     500,000    The City of New York, General Obligation Bonds, Fiscal 1994        2004 at 101          AAA           Aaa
                  Series H, Subseries H-1, 6.125% Due 8/1/09.                          1/2
     525,000    New York City (New York), Municipal Water Finance Authority,       2004 at 101          AAA           Aaa
                  Water and Sewer System Revenue Bonds, Fixed Rate Fiscal              1/2
                  1994 Series F, 5.75% Due 6/15/20.
     500,000    Commonwealth of Puerto Rico, Public Improvement Refunding          2002 at 101          AAA           Aaa
                  Bonds, Series 1992A (General Obligation Bonds.), 6.00% Due           1/2
                  7/1/14.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION
Sales charge/volume discount applies on all concurrent purchases of any Nuveen
trust units. Estimated Current Return equals net income divided by offering
price. Estimated Long Term Return represents an average of the yields to
maturity (or call) of the Bonds in the Trust adjusted to reflect expenses and
sales charges.
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                          Estimated Current Return (2)
                                                              -----------------------------------------------------
          AMOUNT PURCHASED                         Public
- -------------------------------------  Sales      Offering          Monthly         Quarterly       Semi-Annual
     Units              Dollars        Charge     Price (1)         Payment          Payment          Payment
- ----------------  -------------------  ------    -----------     -------------    -------------    -------------
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
50-499                 $5,000-$49,999   4.90 %   $     99.44          5.55%            5.58%            5.60%
500-999                 50,000-99,999   4.75           99.29          5.55             5.59             5.61
1,000-2,499           100,000-249,999   4.50           99.03          5.57             5.60             5.62
2,500-4,999           250,000-499,999   4.25           98.77          5.58             5.62             5.63
5,000-9,999           500,000-999,999   3.50           98.00          5.63             5.66             5.68
10,000-24,999     1,000,000-2,499,999   3.00           97.50          5.66             5.69             5.71
25,000-49,999     2,500,000-4,999,999   2.50           96.99          5.69             5.72             5.74
50,000 and over    5,000,000 and over   2.00           96.50          5.71             5.75             5.77
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>               <C>                  <C>       <C>         <C>                <C>              <C>
          AMOUNT PURCHASED
- -------------------------------------
                                                                         Estimated Long Term Return (3)
     Units                                                    -----------------------------------------------------
- ----------------
                                                   Public
                                       Sales      Offering          Monthly         Quarterly       Semi-Annual
                        Dollars        Charge     Price (1)         Payment          Payment          Payment
                  -------------------  ------    -----------     -------------    -------------    -------------
50-499                 $5,000-$49,999   4.90 %   $     99.44          5.64    %        5.67    %        5.69    %
500-999                 50,000-99,999   4.75           99.29          5.65             5.67             5.69
1,000-2,499           100,000-249,999   4.50           99.03          5.66             5.69             5.71
2,500-4,999           250,000-499,999   4.25           98.77          5.68             5.70             5.72
5,000-9,999           500,000-999,999   3.50           98.00          5.72             5.75             5.77
10,000-24,999     1,000,000-2,499,999   3.00           97.50          5.75             5.78             5.80
25,000-49,999     2,500,000-4,999,999   2.50           96.99          5.78             5.81             5.83
50,000 and over    5,000,000 and over   2.00           96.50          5.81             5.84             5.86
</TABLE>
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1) As of the business day prior to the Date of Deposit. Units are offered at
    the Public Offering Price plus accrued interest.
(2) All figures as of the business day prior to Date of Deposit. The estimated
    current return for purchases made on such date will be as shown, as long as
    the portfolio size and composition remain the same.
(3) In contrast to Estimated Current Return, Estimated Long Term Return reflects
    the amortization of premium or accretion of discount, if any, on the bonds
    in the Trust's portfolio.
 
- --------------------------------------------------------------------------------
 
INTEREST DISTRIBUTIONS TO UNITHOLDERS   Unitholders may elect to have interest
distributions made on a monthly, quarterly, or semi-annual basis. Record Dates
are May 1 and November 1 for semi-annual distributions; February 1, May 1,
August 1 and November 1 for quarterly distributions; and the first of each month
for monthly distributions. Details of interest distributions per unit under the
various plans appear in the following table based upon estimated net annual
interest income at the Date of Deposit:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                                       Normal
                                                                                                                   Distributions
New York Insured Trust                                   1994                                  1995                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        6/1            8/1           11/1            2/1            5/1
Distribution Date.....................       6/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .5970(1)                                                               $  5.5144
                                                             --------    $.4593 every month    --------
Quarterly Distribution Plan...........  $   .5970(1)   $   .9240(2)   $  1.3860      $  1.3860      $  1.3860      $  5.5464
Semi-Annual Distribution Plan.........  $   .5970(1)                  $  2.3175(3)                  $  2.7810      $  5.5654
- ---------------------------------------------------------------------------------------------------------------------------------
<FN>
  * Record Dates for semi-annual distributions are May 1 and November 1; for quarterly distributions, they are February 1, May 1,
    August 1 and November 1. Record Dates for monthly distributions are the first day of each month.
(1) The first distribution will be paid to all Unitholders, regardless of the distribution plan selected. Such distribution may
    be more or less than a regular monthly distribution.
(2) The second distribution under the quarterly distribution plan represents a 2-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 5-month distribution; subsequent semi-annual
    distributions will be regular 6-month distributions.
</TABLE>
 
+ Interest for Unitholders of this series began to accrue as of the Date of
Deposit. Units purchased on the Date of Deposit will have $.11 of accrued
interest that will be added to the Public Offering Price on the Settlement Date.
After provision for expenses of the Fund, the daily rate of accrual from the
Date of Deposit to the first Record Date is $.01531 per unit per day.
Consequently, on the first Record Date (06/01/94), accrued interest will total
$0.5970 per unit for the 39-day period. All interest accrued from the Date of
Deposit to the first Record Date, less expenses, will be distributed on the
first Distribution Date to Unitholders of Record as of the first Record Date.
The first payment to all Unitholders of Record on 06/01/94 is $.5970 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01531              Quarterly - $0.01540
                             Semi-Annual - $0.01545
This daily rate of accrual, and the annual distributions shown above, will
remain the same as long as the portfolio size and composition remain the same.
 
- --------------------------------------------------------------------------------
 
                                                          726
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 24.4 years.
The first bond is scheduled to mature in August, 2009, with the last bond
maturity being April, 2023.
 
- -------------------------------------------------
 
BONDS INSURED BY MBIA   Each bond in this Nuveen Insured series has been
insured* by the Municipal Bond Investors Assurance Corporation, which guarantees
timely payments of principal and interest. Premium payments have been fully paid
by the Date of Deposit.
 
- -------------------------------------------------
 
CALL PROTECTION   Bonds are first subject to optional redemption by the issuers
in the years and at the prices shown under the Redemption Provisions column in
the Schedule of Investments. Unless otherwise stated, in subsequent years, bonds
are redeemable at declining prices, but not usually below par value. Some issues
or some portions of issues may also be subject to sinking fund redemption or
extraordinary redemption without premium prior to the dates shown.
 
- -------------------------------------------------
 
NO CHARGE FOR REDEMPTION   The Trustee, United States Trust Company of New York,
will redeem units at net asset value. In addition, John Nuveen & Co.
Incorporated intends to maintain a secondary market for this Nuveen Tax-Exempt
Unit Trust. Inasmuch as all securities investments are subject to market price
fluctuation, net asset value at the time of redemption could be more or less
than the initial investment.
 
- -------------------------------------------------
 
REINVESTMENT OPTIONS   Specify automatic reinvestment of trust income, with no
sales charge, to earn compounded dividends with Nuveen mutual funds.
 
- -------------------------------------------------
 
* Insurance relates specifically to the bonds and not to the units or to the
  market value of units. Terms of the insurance are more fully described in the
  prospectus. No representation is made as to the insurer's ability to meet its
  commitments. See Section 5 of the prospectus for details.
- -------------------------------------------------------
 
FOR A PROSPECTUS CONTAINING MORE COMPLETE INFORMATION, INCLUDING CHARGES AND
EXPENSES, ON THIS NUVEEN TAX-EXEMPT UNIT TRUST AND ANY OTHER NUVEEN FUND, CALL
YOUR BROKER . . . OR NUVEEN AT
 
                                 1-800-257-8787
 
READ THE PROSPECTUS CAREFULLY BEFORE YOU INVEST OR SEND MONEY.


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