NUVEEN TAX EXEMPT UNIT TRUST SERIES 806
497, 1995-06-08
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<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     NATIONAL
     INSURED
     TRUST 297
 
            Estimated Current Return
            5.21% to 5.42%
            as of 06/06/95
 
            Estimated Long Term Return
            5.26% to 5.48%
             100,000 units in a
             diversified $10,000,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6710A4 108 Monthly Payment Option
                  6710A4 116 Quarterly Payment Option
                  6710A4 124 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 297
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 7, 1995
- --------------------------------------------------------------------------------
 
   
<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>
  --------------------------------------------------------------------------------------------------------------------------
  $  460,000    The Special Care Facilities Financing Authority of the City        2005 at 102          AAA           Aaa
                  of Birmingham (Alabama), Baptist Medical Centers, Revenue
                  Bonds, Series 1995-B (Baptist Health System, Inc.), 5.875%
                  Due 11/15/20.
     525,000    California Health Facilities Financing Authority, Insured          2004 at 102          AAA           Aaa
                  Health Facility Refunding Revenue Bonds (Catholic
                  Healthcare West), 1994 Series B, 5.00% Due 7/1/21.
                  (Original issue discount bonds delivered on or about
                  January 27, 1994 at a price of 93.359% of principal
                  amount.)
     850,000    Brea Redevelopment Agency (Orange County, California), 1993        2003 at 102          AAA           Aaa
                  Tax Allocation Refunding Bonds (Redevelopment Project AB),
                  5.75% Due 8/1/23.
     100,000    State of Florida, Full Faith and Credit, Department of             2005 at 101          AAA           Aaa
                  Transportation, Right-of-Way Acquisition and Bridge
                  Construction Bonds, Series 1995, 5.875% Due 7/1/24.
                  (General Obligation Bonds.)
     100,000    Hillsborough County Aviation Authority, Florida, Tampa             2003 at 102          AAA           Aaa
                  International Airport Revenue Refunding Bonds, 1993 Series
                  B, 5.50% Due 10/1/13.
     100,000    Orange County (Florida), Health Facilities Authority,              2005 at 102          AAA           Aaa
                  Hospital Revenue Bonds, Series 1995 (Adventist Health
                  System/Sunbelt Obligated Group), 5.50% Due 11/15/15. (When
                  issued.)
   1,000,000    City of Chicago (Illinois), Chicago-O'Hare International           2004 at 102          AAA           Aaa
                  Airport, General Airport Second Lien, Revenue Refunding
                  Bonds, 1993 Series C, 5.00% Due 1/1/18.
   1,000,000    Illinois Health Facilities Authority, Revenue Bonds, Series        2004 at 102          AAA           Aaa
                  1994A (Northwestern Memorial Hospital), 6.00% Due 8/15/24.
     215,000    Metropolitan Pier and Exposition Authority (Illinois),             No Optional          AAA           Aaa
                  McCormick Place Expansion Project Bonds, Series 1994B,              Call
                  0.00% Due 6/15/20. (Original issue discount bonds
                  delivered on or about June 23, 1994 at a price of 18.05%
                  of principal amount.)
   1,500,000    City of Cedar Rapids, Iowa, Pollution Control Revenue              2003 at 102          AAA           Aaa
                  Refunding Bonds (Iowa Electric Light and Power Company
                  Project), Series 1993, 5.50% Due 11/1/23.
   1,000,000    Massachusetts Bay Transportation Authority, General                2004 at 102          AAA           Aaa
                  Transportation System Bonds, 1994 Series B Bonds, 5.90%
                  Due 3/1/24. (General Obligation Bonds.)
     500,000    Cedar Springs Public Schools, Counties of Kent and Newaygo,        2004 at 101          AAA           Aaa
                  State of Michigan, 1995 School Building and Site Bonds,              1/2
                  5.875% Due 5/1/24. (Original issue discount bonds
                  delivered on or about March 1, 1995 at a price of 94.348%
                  of principal amount.)(General Obligation Bonds.)
   1,000,000    The Pollution Control Financing Authority of Salem County          2003 at 102          AAA           Aaa
                  (New Jersey), Pollution Control Revenue Refunding Bonds,
                  1993 Series C (Public Service Electric and Gas Company
                  Project), 5.55% Due 11/1/33.
     900,000    Washington Public Power Supply System, Nuclear Project No. 3       2003 at 102          AAA           Aaa
                  Refunding Revenue Bonds, Series 1993C, 5.50% Due 7/1/18.
     750,000    Wisconsin Health and Educational Facilities Authority              2003 at 102          AAA           Aaa
                  Revenue Bonds, Series 1993 (Aurora Health Care Obligated
                  Group), 5.25% Due 8/15/23. (Original issue discount bonds
                  delivered on or about December 8, 1993 at a price of
                  92.911% of principal amount.)
  ----------
  $10,000,000
  ----------
  ----------
</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 %   $    100.70          5.21%            5.24%            5.26%
500-999                 50,000-99,999   4.75          100.55          5.21             5.25             5.26
1,000-2,499           100,000-249,999   4.50          100.28          5.23             5.26             5.28
2,500-4,999           250,000-499,999   4.25          100.02          5.24             5.27             5.29
5,000-9,999           500,000-999,999   3.50           99.24          5.28             5.31             5.33
10,000-24,999     1,000,000- 2,499,999  3.00           98.73          5.31             5.34             5.36
25,000-49,999     2,500,000- 4,999,999  2.50           98.23          5.34             5.37             5.39
50,000 and over    5,000,000 and over   2.00           97.72          5.36             5.40             5.42
</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 %   $    100.70          5.26%            5.30%            5.32%
500-999                 50,000-99,999   4.75          100.55          5.27             5.30             5.32
1,000-2,499           100,000-249,999   4.50          100.28          5.28             5.32             5.34
2,500-4,999           250,000-499,999   4.25          100.02          5.29             5.33             5.35
5,000-9,999           500,000-999,999   3.50           99.24          5.34             5.38             5.39
10,000-24,999     1,000,000- 2,499,999  3.00           98.73          5.36             5.40             5.42
25,000-49,999     2,500,000- 4,999,999  2.50           98.23          5.39             5.43             5.45
50,000 and over    5,000,000 and over   2.00           97.72          5.42             5.46             5.48
</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
National Insured Trust                                   1995                                  1996                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3494(1)                                                               $  5.2422
                                                             --------    $.4368 every month    --------
Quarterly Distribution Plan...........  $   .3494(1)   $   .4395(2)   $  1.3185      $  1.3185      $  1.3185      $  5.2742
Semi-Annual Distribution Plan.........  $   .3494(1)                  $  1.7640(3)                  $  2.6460      $  5.2932
- ---------------------------------------------------------------------------------------------------------------------------------
<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 $.07 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 $.01456 per unit per day.
Consequently, on the first Record Date (07/01/95), accrued interest will total
$0.3494 per unit for the 24-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 07/01/95 is $.3494 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01456              Quarterly - $0.01465
                             Semi-Annual - $0.01470
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 15 Tax-exempt bond issues in this trust; this diversified portfolio
yields current income from issuers in 10 states.
- -------------------------------------------------------
<TABLE>
<CAPTION>
                   Percent
                   of Total
                   Income
<S>                    <C>        <C>
- ------------------------
                                  %
Alabama                      5.0
California                  13.8
Florida                      3.1
Iowa                        15.2
Illinois                    20.2
 
<CAPTION>
                   Percent
                   of Total
                   Income
- ------------------------
<S>                    <C>        <C>
                                  %
Massachusetts               10.8
Michigan                     5.4
New Jersey                  10.2
Washington                   9.1
Wisconsin                    7.2
</TABLE>
 
- -------------------------------------------------
 
AVERAGE PORTFOLIO LIFE The average maturity
of portfolio bonds is 27.9 years. The first bond is scheduled to mature in
October, 2013, with the last bond maturity being November, 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.
 
- -------------------------------------------------
 
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.
 
806
<PAGE>
NUVEEN  Tax-Exempt Unit Trusts
     NUVEEN
     FLORIDA
     INSURED
     TRUST 212
 
            Estimated Current Return
            First
            Year: 4.93% to 5.14%
            Subsequent
            Years: 4.94% to 5.15%
            as of 06/06/95
 
            Estimated Long Term Return
            5.09% to 5.30%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  6706H4 166 Monthly Payment Option
                  6706H4 174 Quarterly Payment Option
                  6706H4 182 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 212
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 7, 1995
- --------------------------------------------------------------------------------
 
   
<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>
  --------------------------------------------------------------------------------------------------------------------------
  $  215,000    State Board of Education of Florida, Public Education              2003 at 101          AAA           Aaa
                  Capital Outlay Refunding Bonds, 1993 Series D, 5.00% Due
                  6/1/15. (General Obligation Bonds.)
     115,000    State of Florida, Full Faith and Credit, State Board of            2003 at 101          AAA           Aaa
                  Education, Public Education Capital Outlay Bonds, 1992
                  Series E, 5.10% Due 6/1/15. (General Obligation Bonds.)
     500,000    State of Florida, Full Faith and Credit, Department of             2005 at 101          AAA           Aaa
                  Transportation, Right-of-Way Acquisition and Bridge
                  Construction Bonds, Series 1995, 5.875% Due 7/1/24.
                  (General Obligation Bonds.)
     260,000    Dade County, Florida, Public Facilities Revenue Bonds              2003 at 102          AAA           Aaa
                  (Jackson Memorial Hospital), Series 1993, 5.625% Due
                  6/1/18.
     500,000    Hillsborough County Aviation Authority, Florida, Tampa             2003 at 102          AAA           Aaa
                  International Airport Revenue Refunding Bonds, 1993 Series
                  B, 5.50% Due 10/1/13.
     250,000    Lee County, Florida, Capital Refunding Revenue Bonds, Series       No Optional          AAA           Aaa
                  1993B, 0.00% Due 10/1/12. (Original issue discount bonds            Call
                  delivered on or about June 16, 1993 at a price of 32.571%
                  of principal amount.)
     500,000    Orange County (Florida), Health Facilities Authority,              2005 at 102          AAA           Aaa
                  Hospital Revenue Bonds, Series 1995 (Adventist Health
                  System/Sunbelt Obligated Group), 5.50% Due 11/15/15. (When
                  issued.)
     280,000    City of Palm Bay, Florida, Utility System Refunding Revenue        2003 at 102          AAA           Aaa
                  Bonds, Series 1994 (Palm Bay Utility Corporation Project),
                  5.00% Due 10/1/19.
     500,000    West Coast Regional Water Supply Authority (Florida),              2005 at 101          AAA           Aaa
                  Refunding Revenue Bonds (Hillsborough County Project),
                  Series 1995, 5.75% Due 10/1/15.
     380,000    Commonwealth of Puerto Rico, Public Improvement Bonds of           2005 at 101          AAA           Aaa
                  1995 (General Obligation Bonds.), 5.75% Due 7/1/24.                  1/2
  ----------
  $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 %   $     99.80     (4.93%)  4.94%     (4.97%)  4.98%     (4.98%)  4.99%
500-999                 50,000-99,999   4.75           99.64     (4.94)   4.95      (4.97)   4.98      (4.99)   5.00
1,000-2,499           100,000-249,999   4.50           99.38     (4.95)   4.96      (4.99)   5.00      (5.01)   5.02
2,500-4,999           250,000-499,999   4.25           99.12     (4.97)   4.98      (5.00)   5.01      (5.02)   5.03
5,000-9,999           500,000-999,999   3.50           98.35     (5.01)   5.02      (5.04)   5.05      (5.06)   5.07
10,000-24,999     1,000,000- 2,499,999  3.00           97.85     (5.03)   5.04      (5.06)   5.07      (5.08)   5.09
25,000-49,999     2,500,000- 4,999,999  2.50           97.34     (5.06)   5.07      (5.09)   5.10      (5.11)   5.12
50,000 and over    5,000,000 and over   2.00           96.85     (5.08)   5.09      (5.12)   5.13      (5.14)   5.15
</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 %   $     99.80          5.09%            5.13%            5.15%
500-999                 50,000-99,999   4.75           99.64          5.09             5.13             5.15
1,000-2,499           100,000-249,999   4.50           99.38          5.11             5.15             5.17
2,500-4,999           250,000-499,999   4.25           99.12          5.12             5.16             5.18
5,000-9,999           500,000-999,999   3.50           98.35          5.16             5.20             5.22
10,000-24,999     1,000,000- 2,499,999  3.00           97.85          5.19             5.23             5.25
25,000-49,999     2,500,000- 4,999,999  2.50           97.34          5.22             5.26             5.28
50,000 and over    5,000,000 and over   2.00           96.85          5.24             5.28             5.30
</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                                  1996                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3288(1)                                                               $  4.9333
                                                             --------    $.4110 every month    --------
Quarterly Distribution Plan...........  $   .3288(1)   $   .4137(2)   $  1.2411      $  1.2411      $  1.2411      $  4.9653
Semi-Annual Distribution Plan.........  $   .3288(1)                  $  1.6608(3)                  $  2.4912      $  4.9843
- ---------------------------------------------------------------------------------------------------------------------------------
<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 $.07 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 $.01370 per unit per day.
Consequently, on the first Record Date (07/01/95), accrued interest will total
$0.3288 per unit for the 24-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 07/01/95 is $.3288 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01370              Quarterly - $0.01379
                             Semi-Annual - $0.01384
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.
 
- --------------------------------------------------------------------------------
 
                                                          806
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 22.5 years.
The first bond is scheduled to mature in October, 2012, 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
     OHIO
     INSURED
     TRUST 125
 
            Estimated Current Return
            5.02% to 5.22%
            as of 06/06/95
 
            Estimated Long Term Return
            5.10% to 5.30%
             35,000 units in a
             diversified $3,500,000
             portfolio of tax-exempt
             bonds rated "AAA"
                  Cusip:
                  67101Y 706 Monthly Payment Option
                  67101Y 714 Quarterly Payment Option
                  67101Y 722 Semi-Annual Payment Option
 
                  Registered in Ohio
                    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, OHIO INSURED TRUST 125
SCHEDULE OF INVESTMENTS
DATE OF DEPOSIT JUNE 7, 1995
- --------------------------------------------------------------------------------
 
   
<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 Ohio (Ohio Higher Educational Facility Commission),       2004 at 102          AAA           Aaa
                  Higher Educational Facility Revenue Bonds (University of
                  Dayton 1994 Project), 5.80% Due 12/1/19.
     500,000    Ohio Water Development Authority, State of Ohio, Water             2005 at 101          AAA           Aaa
                  Pollution Control Loan Fund Revenue Bonds, State Match
                  Series 1995, 5.75% Due 12/1/17.
     205,000    Akron, Bath and Copley Joint Township Hospital District,           2003 at 102          AAA           Aaa
                  Ohio, Hospital Refunding Revenue Bonds, Series 1993
                  (Children's Hospital Medical Center of Akron), 5.00% Due
                  11/15/15. (Original issue discount bonds delivered on or
                  about September 15, 1993 at a price of 93.644% of
                  principal amount.)
     250,000    City of Cleveland, Ohio, Public Power System First Mortgage        No Optional          AAA           Aaa
                  Revenue Bonds, Series 1994A, 0.00% Due 11/15/13. (Original          Call
                  issue discount bonds delivered on or about November 22,
                  1994 at a price of 26.357% of principal amount.)
     500,000    City of Dover, Ohio, Waterworks System Revenue Bonds, Series       2004 at 102          AAA           Aaa
                  1994, 6.00% Due 12/1/20.
     345,000    Hilliard City School District, Ohio, General Obligation            2005 at 102          AAA           Aaa
                  Bonds, School Improvement Bonds, Series 1995A, 5.75% Due
                  12/1/19.
     500,000    County of Lucas, Ohio, Hospital Refunding Revenue Bonds,           2003 at 102          AAA           Aaa
                  Series 1993B (St. Vincent Medical Center), 5.375% Due
                  8/15/17.
     500,000    Southwest Licking Local School District, Licking and               2005 at 100          AAA           Aaa
                  Fairfield Counties, Ohio, School Facilities Construction
                  and Improvement Bonds, 5.75% Due 12/1/22. (General
                  Obligation Bonds.)
     200,000    Commonwealth of Puerto Rico, Public Improvement Refunding          2003 at 101          AAA           Aaa
                  Bonds, Series 1993 (General Obligation Bonds.), 5.50% Due            1/2
                  7/1/13.
  ----------
  $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 %   $    100.87          5.02%            5.05%            5.07%
500-999                 50,000-99,999   4.75          100.71          5.02             5.06             5.07
1,000-2,499           100,000-249,999   4.50          100.45          5.04             5.07             5.09
2,500-4,999           250,000-499,999   4.25          100.19          5.05             5.08             5.10
5,000-9,999           500,000-999,999   3.50           99.41          5.09             5.12             5.14
10,000-24,999     1,000,000- 2,499,999  3.00           98.90          5.12             5.15             5.17
25,000-49,999     2,500,000- 4,999,999  2.50           98.39          5.14             5.17             5.19
50,000 and over    5,000,000 and over   2.00           97.89          5.17             5.20             5.22
</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 %   $    100.87          5.10%            5.14%            5.15%
500-999                 50,000-99,999   4.75          100.71          5.10             5.14             5.15
1,000-2,499           100,000-249,999   4.50          100.45          5.12             5.16             5.17
2,500-4,999           250,000-499,999   4.25          100.19          5.13             5.17             5.18
5,000-9,999           500,000-999,999   3.50           99.41          5.17             5.21             5.22
10,000-24,999     1,000,000- 2,499,999  3.00           98.90          5.20             5.24             5.25
25,000-49,999     2,500,000- 4,999,999  2.50           98.39          5.23             5.27             5.28
50,000 and over    5,000,000 and over   2.00           97.89          5.25             5.29             5.30
</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
Ohio Insured Trust                                       1995                                  1996                  per Year +
<S>                                     <C>            <C>            <C>            <C>            <C>            <C>
- -------------------------------------------------------------------------------------------------------------      --------------
Record Date*..........................        7/1            8/1           11/1            2/1            5/1
Distribution Date.....................       7/15           8/15          11/15           2/15           5/15
- ---------------------------------------------------------------------------------------------------------------------------------
Monthly Distribution Plan.............  $   .3372(1)                                                               $  5.0596
                                                             --------    $.4215 every month    --------
Quarterly Distribution Plan...........  $   .3372(1)   $   .4242(2)   $  1.2726      $  1.2726      $  1.2726      $  5.0916
Semi-Annual Distribution Plan.........  $   .3372(1)                  $  1.7028(3)                  $  2.5542      $  5.1106
- ---------------------------------------------------------------------------------------------------------------------------------
<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 $.07 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 $.01405 per unit per day.
Consequently, on the first Record Date (07/01/95), accrued interest will total
$0.3372 per unit for the 24-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 07/01/95 is $.3372 per unit.
After the first Record Date daily rates of accrual are:
              Monthly - $0.01405              Quarterly - $0.01414
                             Semi-Annual - $0.01419
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.
 
- --------------------------------------------------------------------------------
 
                                                          806
<PAGE>
- -------------------------------------------------------
 
AVERAGE PORTFOLIO LIFE   The average maturity of portfolio bonds is 23.4 years.
The first bond is scheduled to mature in July, 2013, with the last bond maturity
being December, 2022.
 
- -------------------------------------------------------
 
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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