NUVEEN TAX EXEMPT UNIT TRUST SERIES 766
497, 1994-11-17
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     MARYLAND
     TRUST 301
              (MARYLAND TRADITIONAL TRUST 301)
 
            Estimated Current Return
            6.20% to 6.44%
            as of 11/15/94
 
            Estimated Long Term Return
            6.36% to 6.61%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds
                  Cusip:
                  67101L 738 Monthly Payment Option
                  67101L 746 Quarterly Payment Option
                  67101L 753 Semi-Annual Payment Option
 
                  Registered in Maryland
                    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--MARYLAND TRADITIONAL TRUST 301
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT NOVEMBER 16, 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>
  --------------------------------------------------------------------------------------------------------------------------
  $  475,000    Maryland Health and Higher Educational Facilities Authority        2004 at 102          AAA           Aaa
                  Revenue Bonds, Maryland General Hospital Issue, Series
                  1994, 6.20% Due 7/1/24. (MBIA Insured.)
     500,000    City of Baltimore, Maryland (Mayor and City Council of             2004 at 100          AAA           Aaa
                  Baltimore), Convention Center Revenue Bonds, Series 1994,
                  6.00% Due 9/1/17. (FGIC Insured.)
     500,000    Calvert County, Maryland, Pollution Control Revenue                2004 at 102           A            A2
                  Refunding Bonds (Baltimore Gas and Electric Company
                  Project), Series 1993, 5.55% Due 7/15/14.
     500,000    Carroll County, Maryland, General Obligation Bonds, County         2004 at 102          AA-           Aa
                  Commissioners of Carroll County, Consolidated Public
                  Improvement Bonds of 1994, 6.50% Due 10/1/24.
     500,000    Morgan State University, Maryland, Academic Fees and               No Optional          AAA           Aaa
                  Auxiliary Facilities Fees, Revenue Refunding Bonds, 1993            Call
                  Series, 6.05% Due 7/1/15. (MBIA Insured.)
     500,000    Prince George's County, Maryland, Pollution Control Revenue        2003 at 102          A+            A1
                  Refunding Bonds (Potomac Electric Project), 1993 Series,
                  6.375% Due 1/15/23.
     525,000    Washington Suburban Sanitary District, Maryland (Montgomery        2004 at 100          AA            Aa1
                  and Prince George's Counties, Maryland), General
                  Construction Bonds of 1994, 6.625% Due 6/1/19. (General
                  Obligation Bonds.) (When issued.)
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. 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 %   $     96.10          6.20%            6.23%            6.25%
500-999                 50,000-99,999   4.75           95.95          6.21             6.24             6.26
1,000-2,499           100,000-249,999   4.50           95.70          6.22             6.26             6.28
2,500-4,999           250,000-499,999   4.25           95.45          6.24             6.27             6.29
5,000-9,999           500,000-999,999   3.50           94.70          6.29             6.32             6.34
10,000-24,999     1,000,000-2,499,999   3.00           94.22          6.32             6.35             6.37
25,000-49,999     2,500,000-4,999,999   2.50           93.73          6.35             6.39             6.41
50,000 and over    5,000,000 and over   2.00           93.26          6.39             6.42             6.44
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          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 %   $     96.10          6.36%            6.39%            6.41%
500-999                 50,000-99,999   4.75           95.95          6.37             6.40             6.42
1,000-2,499           100,000-249,999   4.50           95.70          6.39             6.42             6.44
2,500-4,999           250,000-499,999   4.25           95.45          6.40             6.43             6.45
5,000-9,999           500,000-999,999   3.50           94.70          6.46             6.49             6.50
10,000-24,999     1,000,000-2,499,999   3.00           94.22          6.49             6.52             6.54
25,000-49,999     2,500,000-4,999,999   2.50           93.73          6.52             6.55             6.57
50,000 and over    5,000,000 and over   2.00           93.26          6.56             6.59             6.61
</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
Maryland Traditional Trust                                              1995                                         per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .7443(1)                                                               $  5.9552
                                                             --------    $.4962 every month    --------
Quarterly Distribution Plan...........  $   .7443(1)   $   .4989(2)   $  1.4967      $  1.4967      $  1.4967      $  5.9872
Semi-Annual Distribution Plan.........  $   .7443(1)                  $  2.0016(3)                  $  3.0024      $  6.0062
- ---------------------------------------------------------------------------------------------------------------------------------
<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 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-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 $.01654 per unit per day.
Consequently, on the first Record Date (01/01/95), accrued interest will total
$0.7443 per unit for the 45-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 01/01/95 is $.7443 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01654              Quarterly - $0.01663
                             Semi-Annual - $0.01668
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.
 
- --------------------------------------------------------------------------------
 
                                                          766
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 25.0 years.
The first bond is scheduled to mature in July, 2014, with the last bond maturity
being October, 2024.
 
- -------------------------------------------------------
 
QUALITY OF PORTFOLIO AS RATED BY
STANDARD & POOR'S CORPORATION
OR MOODY'S INVESTORS SERVICES
- -------------------------------------------------------
 
<TABLE>
<S>                       <C>                    <C>
Rating                    Percent of Portfolio
Category                  Par Value
- --------------------------------------------------------------------
AAA                           42%
AA                            30
A1/A+                         14
A                             14
                             ---
                             100%
</TABLE>
 
- -------------------------------------------------------
 
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.
 
- -------------------------------------------------------
 
UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND ARE NOT FEDERALLY INSURED OR OTHERWISE PROTECTED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND
INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
- -------------------------------------------------------
 
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 235
 
            Estimated Current Return
            6.34% to 6.60%
            as of 11/15/94
 
            Estimated Long Term Return
            6.53% to 6.79%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67064U 527 Monthly Payment Option
                  67064U 535 Quarterly Payment Option
                  67064U 543 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 235
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT NOVEMBER 16, 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 Statewide Communities Development Authority,            2004 at 102          AAA           Aaa
                  Certificates of Participation, Sharp Healthcare Obligated
                  Group, 6.00% Due 8/15/24.
     500,000    California Statewide Communities Development Authority,            2003 at 102          AAA           Aaa
                  Certificates of Participation, Sutter Health Obligated
                  Group, 5.50% Due 8/15/23.
     500,000    State Public Works Board of the State of California, Lease         2004 at 102          AAA           Aaa
                  Revenue Bonds (Department of Corrections), 1994 Series A
                  (California State Prison-Monterey County (Soledad II)),
                  7.00% Due 11/1/19.
     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    Otay Water District (California), Water Revenue Certificates       2004 at 102          AAA           Aaa
                  of Participation (1993 Water Facilities Project), 5.70%
                  Due 9/1/23.
     500,000    Sacramento Municipal Utility District (California), Electric       2003 at 102          AAA           Aaa
                  Revenue Bonds, 1993 Series E, 5.75% Due 5/15/22.
     500,000    San Diego Regional Building Authority (California),                2003 at 102          AAA           Aaa
                  Refunding Lease Revenue Bonds, Series 1993A (San Miguel
                  Consolidated Fire Protection District Project), 5.65% Due
                  1/1/20.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. 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 %   $     89.54          6.34%            6.38%            6.40%
500-999                 50,000-99,999   4.75           89.40          6.35             6.39             6.41
1,000-2,499           100,000-249,999   4.50           89.16          6.37             6.41             6.43
2,500-4,999           250,000-499,999   4.25           88.93          6.39             6.42             6.45
5,000-9,999           500,000-999,999   3.50           88.24          6.44             6.47             6.50
10,000-24,999     1,000,000-2,499,999   3.00           87.78          6.47             6.51             6.53
25,000-49,999     2,500,000-4,999,999   2.50           87.33          6.51             6.54             6.56
50,000 and over    5,000,000 and over   2.00           86.89          6.54             6.57             6.60
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          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 %   $     89.54          6.53%            6.56%            6.59%
500-999                 50,000-99,999   4.75           89.40          6.54             6.57             6.60
1,000-2,499           100,000-249,999   4.50           89.16          6.56             6.59             6.62
2,500-4,999           250,000-499,999   4.25           88.93          6.58             6.60             6.63
5,000-9,999           500,000-999,999   3.50           88.24          6.63             6.66             6.69
10,000-24,999     1,000,000-2,499,999   3.00           87.78          6.66             6.69             6.72
25,000-49,999     2,500,000-4,999,999   2.50           87.33          6.70             6.73             6.76
50,000 and over    5,000,000 and over   2.00           86.89          6.73             6.76             6.79
</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                                                1995                                         per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .7101(1)                                                               $  5.6809
                                                             --------    $.4734 every month    --------
Quarterly Distribution Plan...........  $   .7101(1)   $   .4758(2)   $  1.4274      $  1.4274      $  1.4274      $  5.7129
Semi-Annual Distribution Plan.........  $   .7101(1)                  $  1.9104(3)                  $  2.8656      $  5.7319
- ---------------------------------------------------------------------------------------------------------------------------------
<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 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-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 $.01578 per unit per day.
Consequently, on the first Record Date (01/01/95), accrued interest will total
$0.7101 per unit for the 45-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 01/01/95 is $.7101 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01578              Quarterly - $0.01586
                             Semi-Annual - $0.01592
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.
 
- --------------------------------------------------------------------------------
 
                                                          766
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 28.7 years.
The first bond is scheduled to mature in November, 2019, with the last bond
maturity being September, 2030.
 
- -------------------------------------------------------
 
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.
 
- -------------------------------------------------------
 
UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND ARE NOT FEDERALLY INSURED OR OTHERWISE PROTECTED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND
INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
- -------------------------------------------------------
 
* 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
     FLORIDA
     INSURED
     TRUST 200
 
            Estimated Current Return
            First
            Year: 6.18% to 6.43%
            Subsequent
            Years: 6.22% to 6.47%
            as of 11/15/94
 
            Estimated Long Term Return
            6.42% to 6.66%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H3 580 Monthly Payment Option
                  6706H3 598 Quarterly Payment Option
                  6706H3 606 Semi-Annual Payment Option
 
                  Registered in 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, FLORIDA INSURED TRUST 200
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT NOVEMBER 16, 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    State of Florida, State Board of Education, Public Education       2004 at 101          AAA           Aaa
                  Capital Outlay Bonds, 1994 Series A, 6.00% Due 6/1/19.
                  (General Obligation Bonds.)
     500,000    City of Edgewater, Florida, Water and Sewer Revenue                2003 at 102          AAA           Aaa
                  Refunding Bonds, Series 1993, 5.50% Due 10/1/21.
     500,000    Hillsborough County Aviation Authority, Florida, Tampa             2003 at 102          AAA           Aaa
                  International Airport Revenue Refunding Bonds, 1993 Series
                  B, 5.60% Due 10/1/19.
     500,000    Lee County, Florida, Capital and Transportation Facilities         2003 at 102          AAA           Aaa
                  Refunding Revenue Bonds, Series 1993A, 5.60% Due 10/1/21.
     500,000    City of Tallahassee, Florida, Health Facilities Revenue            2002 at 102          AAA           Aaa
                  Refunding Bonds, Series 1992B (Tallahassee Memorial
                  Regional Medical Center, Inc. Project), 6.00% Due 12/1/15.
     500,000    City of Tampa, Florida, Allegany Health System Revenue             2004 at 102          AAA           Aaa
                  Bonds, St. Joseph's Hospital, Inc. Issue, Series 1994,
                  6.50% Due 12/1/23.
     500,000    City of West Melbourne, Florida, Water and Sewer Revenue           2004 at 101          AAA           Aaa
                  Refunding and Improvement Bonds, Series 1994, 6.75% Due
                  10/1/17. (When issued.)
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. 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 %   $     92.47     (6.18%)  6.22%     (6.22%)  6.25%     (6.24%)  6.27%
500-999                 50,000-99,999   4.75           92.33     (6.19)   6.23      (6.22)   6.26      (6.25)   6.28
1,000-2,499           100,000-249,999   4.50           92.08     (6.21)   6.24      (6.24)   6.28      (6.26)   6.30
2,500-4,999           250,000-499,999   4.25           91.84     (6.22)   6.26      (6.26)   6.30      (6.28)   6.32
5,000-9,999           500,000-999,999   3.50           91.13     (6.27)   6.31      (6.31)   6.35      (6.33)   6.37
10,000-24,999     1,000,000-2,499,999   3.00           90.66     (6.30)   6.34      (6.34)   6.38      (6.36)   6.40
25,000-49,999     2,500,000-4,999,999   2.50           90.19     (6.34)   6.38      (6.37)   6.41      (6.39)   6.43
50,000 and over    5,000,000 and over   2.00           89.73     (6.37)   6.41      (6.40)   6.44      (6.43)   6.47
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          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 %   $     92.47          6.42%            6.45%            6.47%
500-999                 50,000-99,999   4.75           92.33          6.43             6.46             6.47
1,000-2,499           100,000-249,999   4.50           92.08          6.45             6.48             6.49
2,500-4,999           250,000-499,999   4.25           91.84          6.46             6.49             6.51
5,000-9,999           500,000-999,999   3.50           91.13          6.51             6.54             6.56
10,000-24,999     1,000,000-2,499,999   3.00           90.66          6.55             6.58             6.60
25,000-49,999     2,500,000-4,999,999   2.50           90.19          6.58             6.61             6.63
50,000 and over    5,000,000 and over   2.00           89.73          6.62             6.64             6.66
</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
Florida Insured Trust                                                   1995                                         per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .7186(1)                                                               $  5.7503
                                                             --------    $.4791 every month    --------
Quarterly Distribution Plan...........  $   .7186(1)   $   .4818(2)   $  1.4454      $  1.4454      $  1.4454      $  5.7823
Semi-Annual Distribution Plan.........  $   .7186(1)                  $  1.9332(3)                  $  2.8998      $  5.8013
- ---------------------------------------------------------------------------------------------------------------------------------
<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 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-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 $.01597 per unit per day.
Consequently, on the first Record Date (01/01/95), accrued interest will total
$0.7186 per unit for the 45-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 01/01/95 is $.7186 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01597              Quarterly - $0.01606
                             Semi-Annual - $0.01611
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.
 
- --------------------------------------------------------------------------------
 
                                                          766
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 25.2 years.
The first bond is scheduled to mature in December, 2015, with the last bond
maturity being December, 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.
 
- -------------------------------------------------------
 
UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND ARE NOT FEDERALLY INSURED OR OTHERWISE PROTECTED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND
INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
- -------------------------------------------------------
 
* 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
     MASSACHUSETTS
     INSURED
     TRUST 120
 
            Estimated Current Return
            6.20% to 6.44%
            as of 11/15/94
 
            Estimated Long Term Return
            6.44% to 6.69%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  670947 191 Monthly Payment Option
                  670947 209 Quarterly Payment Option
                  670947 217 Semi-Annual Payment Option
 
                  Registered in Massachusetts
                    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, MASSACHUSETTS INSURED TRUST 120
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT NOVEMBER 16, 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    Massachusetts Bay Transportation Authority, General                2003 at 102          AAA           Aaa
                  Transportation System Bonds, 1993 Series A Refunding,
                  5.50% Due 3/1/22. (General Obligation Bonds.)
     500,000    Massachusetts Health and Educational Facilities Authority,         2003 at 102          AAA           Aaa
                  Revenue Bonds, Falmouth Hospital Issue, Series C, 5.625%
                  Due 7/1/11.
     500,000    Massachusetts Health and Educational Facilities Authority,         2004 at 102          AAA           Aaa
                  Revenue Bonds, New England Medical Center Hospitals Issue,
                  Series G-1, 5.375% Due 7/1/24.
     500,000    Massachusetts Health and Educational Facilities Authority,         2004 at 102          AAA           Aaa
                  Revenue Bonds, Smith College Issue, Series D, 5.75% Due
                  7/1/24.
     500,000    Massachusetts Water Pollution Abatement Trust, Water               2004 at 102          AAA           Aaa
                  Pollution Abatement Revenue Bonds (SESD Loan Program),
                  1994 Series A, 6.375% Due 2/1/15.
     500,000    Town of Framingham, Massachusetts, General Obligation Bonds,       2004 at 102          AAA           Aaa
                250M-6.125% Due 8/15/11,
                250M-6.20% Due 8/15/12.
     500,000    South Essex Sewerage District, Massachusetts, General              2004 at 102          AAA           Aaa
                  Obligation Sewer Bonds, 1994 Series B, 7.00% Due 6/1/24.
                  (When issued.)
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. 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 %   $     92.49          6.20%            6.23%            6.25%
500-999                 50,000-99,999   4.75           92.35          6.20             6.24             6.26
1,000-2,499           100,000-249,999   4.50           92.10          6.22             6.26             6.28
2,500-4,999           250,000-499,999   4.25           91.86          6.24             6.27             6.29
5,000-9,999           500,000-999,999   3.50           91.15          6.29             6.32             6.34
10,000-24,999     1,000,000-2,499,999   3.00           90.68          6.32             6.35             6.38
25,000-49,999     2,500,000-4,999,999   2.50           90.22          6.35             6.39             6.41
50,000 and over    5,000,000 and over   2.00           89.76          6.38             6.42             6.44
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          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 %   $     92.49          6.44%            6.48%            6.50%
500-999                 50,000-99,999   4.75           92.35          6.45             6.48             6.50
1,000-2,499           100,000-249,999   4.50           92.10          6.47             6.50             6.52
2,500-4,999           250,000-499,999   4.25           91.86          6.48             6.52             6.54
5,000-9,999           500,000-999,999   3.50           91.15          6.53             6.57             6.59
10,000-24,999     1,000,000-2,499,999   3.00           90.68          6.57             6.61             6.63
25,000-49,999     2,500,000-4,999,999   2.50           90.22          6.60             6.64             6.66
50,000 and over    5,000,000 and over   2.00           89.76          6.64             6.67             6.69
</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
Massachusetts Insured Trust                                             1995                                         per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .7159(1)                                                               $  5.7299
                                                             --------    $.4773 every month    --------
Quarterly Distribution Plan...........  $   .7159(1)   $   .4800(2)   $  1.4400      $  1.4400      $  1.4400      $  5.7619
Semi-Annual Distribution Plan.........  $   .7159(1)                  $  1.9260(3)                  $  2.8890      $  5.7809
- ---------------------------------------------------------------------------------------------------------------------------------
<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 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-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 $.01591 per unit per day.
Consequently, on the first Record Date (01/01/95), accrued interest will total
$0.7159 per unit for the 45-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 01/01/95 is $.7159 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01591              Quarterly - $0.01600
                             Semi-Annual - $0.01605
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.
 
- --------------------------------------------------------------------------------
 
                                                          766
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 24.3 years.
The first bond is scheduled to mature in July, 2011, with the last bond maturity
being July, 2024.
 
- -------------------------------------------------------
 
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.
 
- -------------------------------------------------------
 
UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND ARE NOT FEDERALLY INSURED OR OTHERWISE PROTECTED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND
INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
- -------------------------------------------------------
 
* 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 226
 
            Estimated Current Return
            First
            Year: 6.25% to 6.50%
            Subsequent
            Years: 6.30% to 6.55%
            as of 11/15/94
 
            Estimated Long Term Return
            6.48% to 6.73%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H5 858 Monthly Payment Option
                  6706H5 866 Quarterly Payment Option
                  6706H5 874 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 226
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT NOVEMBER 16, 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    Dormitory Authority of the State of New York, Dormitory            2004 at 102          AAA           Aaa
                  Revenue Bonds, State University Issue, Series X, 7.40% Due
                  7/1/24. (When issued.)
     230,000    New York State Energy Research and Development Authority,          2004 at 102          AAA           Aaa
                  Pollution Control Refunding Revenue Bonds (New York State
                  Electric & Gas Corporation Project), 1994 Series A, 6.05%
                  Due 4/1/34.
     500,000    New York State Housing Finance Agency, Service Contract            2004 at 102          AAA           Aaa
                  Obligation Revenue Bonds, 1994 Series A, 6.375% Due
                  9/15/14. (General Obligation Bonds.)
     500,000    New York Local Government Assistance Corporation (A Public         No Optional          AAA           Aaa
                  Benefit Corporation of the State of New York), Series               Call
                  1993C Refunding Bonds, 5.50% Due 4/1/17.
     500,000    New York State Thruway Authority, Highway and Bridge Trust         2004 at 102          AAA           Aaa
                  Fund Bonds, Series 1994A, 6.00% Due 4/1/14.
     270,000    New York State Urban Development Corporation, Correctional         2004 at 102          AAA           Aaa
                  Capital Facilities Revenue Bonds, 1993A Refunding Series,
                  5.25% Due 1/1/21. (Original issue discount bonds delivered
                  on or about January 4, 1994 at a price of 92.542% of
                  principal amount.)
     500,000    The City of New York, General Obligation Bonds, Fiscal 1995        2004 at 101          AAA           Aaa
                  Series B, 6.95% Due 8/15/12.
     500,000    New York City (New York), Municipal Water Finance Authority,       2004 at 101          AAA           Aaa
                  Water and Sewer System Revenue Bonds, Fixed Rate Fiscal
                  1994 Series B, 5.50% Due 6/15/19.
  ----------
  $3,500,000
  ----------
  ----------
</TABLE>
 
<PAGE>
- --------------------------------------------------------------------------------
UNIT PRICE, ESTIMATED CURRENT RETURN AND ESTIMATED LONG TERM RETURN DEPEND ON
AMOUNT PURCHASED AND PAYMENT OPTION    The sales charges/volume discounts below
apply on all concurrent purchases of any Nuveen trust units, unless any such
purchases are made by a class of investors for which a separate sales charge is
applicable as described more fully in the Prospectus. 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 %   $     94.41     (6.25%)  6.30%     (6.29%)  6.33%     (6.31%)  6.35%
500-999                 50,000-99,999   4.75           94.26     (6.26)   6.31      (6.30)   6.34      (6.32)   6.36
1,000-2,499           100,000-249,999   4.50           94.01     (6.28)   6.32      (6.32)   6.36      (6.34)   6.38
2,500-4,999           250,000-499,999   4.25           93.77     (6.30)   6.34      (6.33)   6.38      (6.35)   6.40
5,000-9,999           500,000-999,999   3.50           93.04     (6.35)   6.39      (6.38)   6.43      (6.40)   6.45
10,000-24,999     1,000,000-2,499,999   3.00           92.56     (6.38)   6.42      (6.41)   6.46      (6.43)   6.48
25,000-49,999     2,500,000-4,999,999   2.50           92.08     (6.41)   6.46      (6.45)   6.49      (6.47)   6.51
50,000 and over    5,000,000 and over   2.00           91.61     (6.45)   6.49      (6.48)   6.53      (6.50)   6.55
</TABLE>
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                         Estimated Long Term Return (3)
                                                              -----------------------------------------------------
          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 %   $     94.41          6.48%            6.51%            6.53%
500-999                 50,000-99,999   4.75           94.26          6.48             6.52             6.54
1,000-2,499           100,000-249,999   4.50           94.01          6.50             6.54             6.56
2,500-4,999           250,000-499,999   4.25           93.77          6.52             6.56             6.58
5,000-9,999           500,000-999,999   3.50           93.04          6.57             6.61             6.63
10,000-24,999     1,000,000-2,499,999   3.00           92.56          6.61             6.65             6.66
25,000-49,999     2,500,000-4,999,999   2.50           92.08          6.64             6.68             6.70
50,000 and over    5,000,000 and over   2.00           91.61          6.67             6.71             6.73
</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
New York Insured Trust                                                  1995                                         per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        1/1            2/1            5/1            8/1           11/1
Distribution Date.....................       1/15           2/15           5/15           8/15          11/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .7429(1)                                                               $  5.9461
                                                             --------    $.4953 every month    --------
Quarterly Distribution Plan...........  $   .7429(1)   $   .4980(2)   $  1.4940      $  1.4940      $  1.4940      $  5.9781
Semi-Annual Distribution Plan.........  $   .7429(1)                  $  1.9980(3)                  $  2.9970      $  5.9971
- ---------------------------------------------------------------------------------------------------------------------------------
<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 1-month distribution; subsequent quarterly
    distributions will be regular 3-month distributions.
(3) The second distribution under the semi-annual distribution plan represents a 4-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 $.01651 per unit per day.
Consequently, on the first Record Date (01/01/95), accrued interest will total
$0.7429 per unit for the 45-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 01/01/95 is $.7429 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01651              Quarterly - $0.01660
                             Semi-Annual - $0.01665
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.
 
- --------------------------------------------------------------------------------
 
                                                          766
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 23.7 years.
The first bond is scheduled to mature in August, 2012, with the last bond
maturity being April, 2034.
 
- -------------------------------------------------------
 
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.
 
- -------------------------------------------------------
 
UNITS OF THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK AND ARE NOT FEDERALLY INSURED OR OTHERWISE PROTECTED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER AGENCY AND
INVOLVE INVESTMENT RISK, INCLUDING THE POSSIBLE LOSS OF PRINCIPAL.
 
- -------------------------------------------------------
 
* 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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