THORNBURG INVESTMENT TRUST
N-30D, 1999-11-30
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Letter to shareholders
November 15, 1999
William V. Fries, CFA
Portfolio Manager
Dear Fellow Shareholders,
The fiscal year ended  September 30 was excellent for the Thornburg  Value Fund.
The results for the fiscal year,  calendar  year-to-date and since inception are
shown in the table below.  These  returns are for  investors who held the shares
from the beginning of each period with all dividends  reinvested.  Since the end
of the fiscal year, investment performance has continued to be healthy.
Total return performance as of 9/30/99
                           Inception:  10/2/95
<TABLE>
<CAPTION>

                                     A Shares                                         C Shares
                   Cal. YTD   1 Year   3 Years   Since Incept.      Cal. YTD   1 Year     3 Years   Since Incept.
<S>                 <C>       <C>       <C>       <C>                 <C>       <C>       <C>       <C>
Net Asset Value     12.99%    35.50%    26.86%**  26.16%**            12.38%    34.45%    25.84%**  25.20%**
Max Offering Price  7.91%     23.39%    24.94%**  24.73%**            11.38%    34.45%    25.84%**  25.20%**

<FN>
Past performance cannot guarantee future results.
    * Assumes redemption during the period.
    ** Annualized.

</FN>
</TABLE>

The stocks of  companies  involving  technology,  communications  and  financial
services  were prime  drivers of the year's good  performance.  Buyout  activity
(ARCO, Fore Systems, Learning Company, Liechtenstein Global Trust and U.S. West)
also played a positive role. Market weakness late in the fiscal year dropped net
asset value per share materially below peak levels reached in mid-July. A couple
of 25 basis point increases in the fed funds rate (what banks pay to borrow) set
off concern that the fight to ward off  inflation  from a booming  economy would
require  more  vigorous  Fed  action.  Up  until  recently,  potential  monetary
authority action has been dampening  enthusiasm for most equities.  I say "most"
because  there has been plenty of  enthusiasm  for selected  sectors;  Internet,
technology and telecommunications  equipment, for example. The narrowness of the
market advance since the end of the fiscal year coupled with a wide disparity of
valuations   is  causing  a  good  deal  of   consternation   among   investment
professionals espousing a traditional value philosophy. Lower interest rates are
now an unreliable  tailwind for stock value.  Earnings  and,  more  importantly,
robust and  reliable  revenue and earnings  growth,  have become  paramount  for
investors.  This is not new.  Earnings  growth is what equity  investing  is all
about.  What is new is the number of companies  enjoying  extraordinary  growth,
especially in the technology  arena. We have been fortunate to own some of these
companies (Advent, Intel, Lam Research, Nortel). It is hard to imagine, but less
than a year ago, a number of today's  favored  semiconductor  and  semiconductor
equipment stocks were losing money with deeply  depressed stock prices.  For us,
it presented a great opportunity! We believe there are similar opportunities for
investors today.

An example of one such opportunity is a recent addition to the portfolio, Health
Management  Associates.  From a financial  standpoint,  the  healthcare  service
industry has been in turmoil for a couple of years.  Most publicly traded stocks
in this sector have been poor  performers.  In the past,  Health  Management had
done a creditable  job of both buying and operating  small city  hospitals.  Not
immune to the negative  trends  affecting the industry,  however,  the company's
consistent  record of growth has been interrupted by pressure on profit margins.
In part, these related to cuts in Medicare reimbursement.  We are optimistic the
worst is over for the company.  Its service is essential.  Demographics  suggest
growing demand,  and efficient  operators such as Hospital  Management should be
able  to  prosper.  In  today's  environment,  the  stock  is  priced  with  low
expectations. Another area of current opportunity is personal care companies. We
have added Dial Corp and Kimberly Clark to the portfolio. A couple of years ago,
investors  were  willing to pay  almost any price to own brand name  franchises.
This is not the case today.  Issues such as the  bargaining  power of retailers,
adverse currency  translations and a perception of lower growth have reduced the
appeal of these  stocks.  Nonetheless,  both  Dial and  Kimberly  Clark  possess
attractive  attributes.  Both enjoy high  profitability,  market  leadership and
consistent  and  improving  earnings.  The above  examples of stocks we like are
offered  to help you  understand  the  nature of our value  philosophy.  The new
stocks we add to the portfolio  may not seem to have good  prospects at the time
of purchase, but how they are perceived next year is what is important. The Fund
continues to be a focused but diversified  portfolio composed of 46 stocks in 23
industries at September 30.  Semiconductor,  semiconductor capital equipment and
telecommunications  equipment  stocks  account for 4.4%,  6.2% and 7.1%,  of the
portfolio,  respectively.  Financial services (banks,  investment managers,  and
brokers)  account for 13.7%.  On September  30, 1999 an income  distribution  of
$0.01 per share on Class A shares  was paid.  On  November  1, 1999 a  long-term
capital gain  distribution  of $0.39 per share on Class A and C shares was paid.
These  distributions  were very modest in  relation  to the  overall  investment
performance  of  the  fund.  Achieving  excellent  performance  relative  to our
investment  objective is our most important job. Being tax efficient for taxable
investors continues to be a priority as well. For more complete  descriptions of
the stocks we hold in your  Thornburg  Value Fund  portfolio,  please  visit our
Website at www.thornburg.com. We appreciate your continued trust and confidence.
Thank you for investing with us.

Respectfully,

William V. Fries, CFA
Portfolio Manager

Tax Update
THORNBURG VALUE FUND'S AFTER TAX RETURNS SHOW GREAT TAX EFFICIENCY

Federal  income taxes have had only a slight  impact on your fund's  return - an
important  consideration for investors who own mutual funds in taxable accounts.
While the pretax  return is most often used to tally a fund's  performance,  the
fund's after-tax return may be a better  representation of your net return.  The
after tax  return  accounts  for taxes you may pay on  distributions  of capital
gains  and  income  dividends.  If  you  own  the  Thornburg  Value  Fund  in  a
tax-deferred account such as an individual  retirement account or a 401(k), this
information  does not apply to you.  Such  accounts  are not  subject to current
federal income taxes.

The Table below presents the pretax and after-tax  returns for your fund (and an
appropriate peer group of mutual funds). Two things to keep in mind:

         o The  after-tax  return  calculations  use the top federal  income tax
rates in effect at the time of each  distribution.  The tax  burden,  therefore,
would be somewhat less, and the after-tax  return somewhat more, if you are in a
lower tax bracket.
         o The peer funds' returns are provided by Morningstar, Inc.

As you can see, the  Thornburg  Value Fund's  pretax total returns of 35.50% and
34.45% (to A and C shares,  respectively)  for the 12 months ended September 30,
1999 were only  slightly  reduced by taxes.  For  investors  in the  highest tax
bracket,  the fund's pretax  returns to A and C shares were cut by only .33% and
 .08%,  respectively.  By  comparison,  the average  "midcap blend" fund earned a
pretax  return  of  19.97%  and an  after  tax  return  of  18.33%.  Morningstar
classifies Thornburg Value Fund as a midcap blend fund.

<TABLE>
<CAPTION>
                                     Average Annual Returns: Pretax and After-Tax
                                          Periods Ended September 30, 1999
                                         1 Year                            3 Years
                           Pretax  After-Tax  Tax  Efficiency   Pretax  After-Tax  Tax  Efficiency
<S>                         <C>      <C>           <C>          <C>       <C>         <C>
Thornburg Value Fund -A     35.50%   35.17%        99.1%        26.86%    25.05%      93.3%
Thornburg Value Fund -C     34.45%   34.37%        99.8%        25.84%    24.39%      94.4%
Average  Fund*              19.97%   18.33%        91.8%        13.56%    11.13%      82.1%
<FN>

*Based on data from Morningstar, Inc. for 266 Midcap Blend Funds.
</FN>
</TABLE>

The Thornburg Value Fund results, before and after taxes, compare favorably with
those of its average peer. Your fund lost less to taxes (one year tax efficiency
of 99.1%,  A shares)  than its peer group  average (one year tax  efficiency  of
91.8%).  Your fund also earned a higher pretax return  (35.50% vs.  19.97%) than
its peer group average.

It is very difficult to predict tax  efficiency.  A fund's tax efficiency can be
influenced  by its  turnover  rate,  the  types  of  securities  it  holds,  the
accounting  practices  it uses  when  selling  shares,  and the net cash flow it
receives. The tax efficiency of Thornburg Value Fund thus far is no accident. We
have worked to manage our investment  activities in a tax efficient manner,  and
we will  continue  to do so. Our  calculations  do not reflect the tax effect of
your own investment activities.  You may incur additional capital gains taxes if
you decide to sell all or some of your shares.

A  Note  About  Our   Calculations:   Pretax  total  returns   assume  that  all
distributions   received  (income  dividends,   short-term  capital  gains,  and
long-term  capital  gains) are  reinvested  in new shares,  while our  after-tax
returns assume that highest  individual  federal income tax rates at the time of
the distributions.  Those rates are currently 39.6% for dividends and short-term
capital gains and 20% for long-term  capital  gains.  The  calculation  does not
account for state and local income  taxes,  nor does it take into  consideration
any tax  adjustments  that a shareholder may claim for foreign taxes paid by the
fund. The competitive  group returns provided by Morningstar are calculated in a
manner  consistent  with  that  used  for  Thornburg  Value  Fund.  All A  share
calculations  assume  purchase  at net  asset  value and no  redemption.  Return
calculations  reflecting  the maximum  sales charge  applicable  to A shares are
shown on page 1 of this report.

Statement of assets and liabilities
Thornburg Value Fund

ASSETS

Investments, at value (cost $482,998,639) .......................$548,380,866
Cash ............................................................  11,384,400
Receivable for securities sold ..................................   7,859,829
Receivable for fund shares sold .................................   5,328,564
Dividends receivable ............................................     779,585
Prepaid expenses and other assets ...............................      54,522
                           Total Assets ......................... 573,787,766

LIABILITIES

Payable for securities purchased ................................  23,325,895
Payable for fund shares redeemed ................................     562,453
Unrealized loss on forward exchange contracts (Note 6) ..........   1,876,570
Payable to investment advisor ...................................     440,038
Accounts payable and accrued expenses ...........................     325,963
                           Total Liabilities ....................  26,530,919
NET ASSETS ......................................................$547,256,847

NET ASSETS CONSIST OF:
     Net unrealized appreciation (depreciation) on investments ..$ 63,623,747
     Accumulated net realized gain ..............................   9,572,912
     Net capital paid in on shares of beneficial interest ....... 474,060,188
                                                                 $547,256,847

NET ASSET VALUE:
Class A Shares:
Net asset value and redemption price per share
($360,966,176 applicable to 13,776,135 shares of beneficial
interest outstanding - Note 4) ...............................   $      26.20

Maximum sales charge, 4.50% of offering
price (4.70% of net asset value per share) ...................           1.23
Maximum Offering Price Per Share .............................   $      27.43

Class C Shares:
Net asset value and offering price per share*
($133,933,653 applicable to 5,136,388 shares of beneficial
interest outstanding - Note 4) ...............................   $      26.08

Class I Shares:
Net asset value, offering and redemption price per share
($52,357,018 applicable to 1,994,090 shares of beneficial
interest outstanding - Note 4) ...............................   $      26.26

*  Redemption  price per share is equal to net asset  value less any  applicable
contingent deferred sales charge. See notes to financial statements.

Statement of operations
INVESTMENT INCOME
Dividend income (net of foreign taxes withheld of $191,813) .   $  6,558,699
Interest income .............................................        721,348
Other income ................................................        287,695
                           Total Income .....................      7,567,742

EXPENSES
Investment advisory fees (Note 3) ...........................      3,210,299
Administration fees (Note 3)
         Class A Shares .....................................        319,626
         Class C Shares .....................................        106,392
         Class I Shares .....................................         13,259
Distribution and service fees (Note 3)
         Class A Shares .....................................        639,251
         Class C Shares .....................................        851,134
Transfer agent fees .........................................        345,218
Registration & filing fees ..................................         97,346
Custodian fees ..............................................        186,785
Professional fees ...........................................         37,286
Accounting fees .............................................         27,530
Trustee fees ................................................          6,116
Other expenses ..............................................         34,995
                           Total Expenses ...................      5,875,237

Less:
Expenses reimbursed by investment advisor (Note 3) ..........        (35,996)

Net Expenses ................................................      5,839,241

                           Net Investment Income ............      1,728,501

REALIZED AND UNREALIZED GAIN (LOSS) - NOTE 5 Net realized gain on:
         Investments .......................................       9,010,585
         Foreign currency transactions .....................       2,221,065
         Option contracts written ..........................         318,589
                                                                  11,550,239

Net unrealized appreciation (depreciation)
         Investments ........................................     59,359,747
          Foreign currency translation ......................       (292,463)
                                                                  59,067,284

                           Net Realized and Unrealized
                           Gain on Investments ..............     70,617,523

                           Net Increase in Net Assets Resulting
                           From Operations .                    $ 72,346,024

See notes to financial statements.
<TABLE>
<CAPTION>

Statements of changes in net assets
                                                                           Year Ended          Year Ended
                                                                       September 30, 1999  September 30, 1998

INCREASE (DECREASE) IN
NET ASSETS FROM:

OPERATIONS:
<S>                                                                         <C>              <C>
Net investment income ...................................................   $   1,728,501    $   1,118,961
Net realized gain (loss) on investments and foreign currency transactions      11,550,239         (168,836)
Increase (decrease) in unrealized appreciation on investments
and foreign currency translation ........................................      59,067,284      (10,040,414)

                           Net Increase (Decrease) in Net Assets
                           Resulting from Operations ....................      72,346,024       (9,090,289)

DIVIDENDS TO SHAREHOLDERS:
From net investment income
         Class A Shares .................................................      (2,125,801)        (938,716)
         Class C Shares .................................................        (251,359)         (27,348)
         Class I Shares .................................................        (302,311)               0

From realized gains
         Class A Shares .................................................               0       (4,677,701)
         Class C Shares .................................................               0         (746,009)
         Class I Shares .................................................               0                0

From return of capital
         Class A Shares .................................................               0         (165,589)
         Class C Shares .................................................               0           (4,824)
         Class I Shares .................................................               0                0

FUND SHARE TRANSACTIONS - (Note 4)
         Class A Shares .................................................     158,138,008       95,534,687
         Class C Shares .................................................      77,354,880       35,229,776
         Class I Shares .................................................      50,091,345                0

                           Net Increase in Net Assets ...................     355,250,786      115,113,987


NET ASSETS:

         Beginning of year ..............................................     192,006,061       76,892,074
End of year .............................................................   $ 547,256,847    $ 192,006,061

See notes to financial statements .......................................
</TABLE>

Notes to financial statements
Thornburg Investment Trust
Note 1 - Organization
Thornburg  Value Fund  hereinafter  referred to as the "Fund," is a  diversified
series of Thornburg Investment Trust (the "Trust"). The Trust was organized as a
Massachusetts business trust under a Declaration of Trust dated June 3, 1987 and
is registered as a diversified, open-end management investment company under the
Investment Company Act of 1940, as amended. The Trust is currently issuing seven
series  of shares  of  beneficial  interest  in  addition  to those of the Fund:
Thornburg Limited Term U.S.  Government Fund,  Thornburg New Mexico Intermediate
Municipal Fund,  Thornburg  Intermediate  Municipal Fund, Thornburg Limited Term
Income Fund,  Thornburg Florida  Intermediate  Municipal Fund,  Thornburg Global
Value Fund and Thornburg New York  Intermediate  Municipal  Fund. Each series is
considered to be a separate entity for financial reporting and tax purposes. The
Fund seeks long-term  capital  appreciation  by investing  primarily in domestic
equity  securities  selected on a value basis.  The Fund currently  offers three
classes of shares of  beneficial  interest,  Class A, Class C and  Institutional
Class (Class I) shares. Each class of shares of a Fund represents an interest in
the same portfolio of  investments  of the Fund,  except that (i) Class A shares
are sold subject to a front-end  sales  charge  collected at the time the shares
are  purchased and bear a service fee, (ii) Class C shares are sold at net asset
value  without a sales  charge at the time of  purchase,  but are  subject  to a
service fee and a  distribution  fee, (iii) Class I shares are sold at net asset
value  without a sales charge at the time of purchase,  and (iv) the  respective
classes  have  different  reinvestment  privileges.  Additionally,  the Fund may
allocate among its classes certain expenses, to the extent allowable to specific
classes,  including transfer agent fees,  government  registration fees, certain
printing and postage costs, and  administrative  and legal expenses.  Currently,
class  specific  expenses  of  the  Fund  are  limited  to  distribution   fees,
administrative fees and certain transfer agent expenses.

Note 2 - Significant  Accounting Policies Significant accounting policies of the
Fund are as follows:
Valuation of Securities:  In determining net asset value, investments are stated
at value  based on latest  sales  prices  at 4:00 pm est  reported  on  national
securities  exchanges on the last  business day of the period.  Investments  for
which no sale is reported are valued at the mean  between bid and asked  prices.
Securities for which market  quotations are not readily  available are valued at
fair value as determined  by management  and approved in good faith by the Board
of Trustees.  Short term obligations  having remaining  maturities of 60 days or
less are valued at  amortized  cost which  approximates  market  value.  Options
written:  When the Fund  writes a call  option,  an amount  equal to the premium
received  by the  Fund  is  included  in the  Fund's  statement  of  assets  and
liabilities  as a  liability.  The  amount  of  the  liability  is  subsequently
marked-to-market to reflect the current market value of the option written.  The
current market value of a traded option is the last sales price on the principal
exchange  on which such option is traded,  or in the  absence of such sale,  the
latest ask quotation.  When an option expires on its stipulated  expiration date
or the Fund enters into a closing purchase transaction, the Fund realizes a gain
(or loss if the cost of a  closing  purchase  transaction  exceeds  the  premium
received when the option was sold) without regard to any unrealized gain or loss
on the  underlying  security,  and  the  liability  related  to such  option  is
extinguished.  When a call option is exercised, the Fund realizes a gain or loss
from the sale of the  underlying  security and the  proceeds  from such sale are
increased by the premium originally received.  The risk in writing a call option
is that the Fund gives up the  opportunity  of profit if the market price of the
security  increases.  The Fund also has the additional risk of not being able to
enter into a closing  transaction if a liquid  secondary  market does not exist.
Foreign Currency  Translation:  Porfolio securities  securities and other assets
and  liabilities  denominated in foreign  currencies  are  translated  into U.S.
dollars based on the exchange rate of such currencies against the U.S. dollar on
the date of  valuation.  Purchases  and sales of  securities  and  income  items
denominated  in  foreign  currencies  are  translated  into U.S.  dollars at the
exchange  rate in effect on the  translation  date.  When the Fund  purchases or
sells  foreign  securities  it will  customarily  enter into a foreign  exchange
contract to minimize foreign exchange risk from the trade date to the settlement
date of such  transactions.  The Fund does not  separately  report the effect of
changes in foreign  exchange  rates from changes in market  prices on securities
held. Such changes are included in net realized and unrealized gain or loss from
investments.  Federal Income Taxes:  It is the policy of the Fund to comply with
the provisions of the Internal Revenue Code applicable to "regulated  investment
companies"  and to  distribute  all of its taxable  income to its  shareholders.
Therefore, no provision for Federal income tax is required. Net realized capital
losses are carried  forward to offset  realized  gains in future  years.  To the
extent  such  carryforwards  are used,  no capital  distributions  will be made.
When-Issued  and  Delayed  Delivery   Transactions:   The  Fund  may  engage  in
when-issued or delayed  delivery  transactions.  To the extent a Fund engages in
such  transactions,  it  will  do so for  the  purpose  of  acquiring  portfolio
securities  consistent with its investment objectives and not for the purpose of
investment  leverage or to  speculate  on market  changes.  At the time the Fund
makes a commitment to purchase a security on a when-issued basis, it will record
the transaction  and reflect the value in determining its net asset value.  When
effecting such transactions,  assets of the Fund of an amount sufficient to make
payment for the portfolio  securities to be purchased  will be segregated on the
Fund's records on the trade date.  Dividends:  Dividends to the shareholders are
paid quarterly and are reinvested in additional  shares of the Fund at net asset
value per share at the close of business on the dividend payment date, or at the
shareholder's  option,  paid in cash. Net realized  capital gains, to the extent
available, will be distributed annually. Distributions to shareholders are based
on income tax regulations and therefore,  their  characteristics  may differ for
financial  statement  and tax purposes.  General:  Securities  transactions  are
accounted  for on a trade date basis.  Interest  income is accrued as earned and
dividend  income is recorded on the  ex-dividend  date.  Use of  Estimates:  The
preparation  of financial  statements,  in conformity  with  generally  accepted
accounting  principles,  requires  management to make estimates and  assumptions
that affect the reported amounts of assets and liabilities and the disclosure of
contingent  assets and  liabilities at the date of the financial  statements and
the reported  amounts of increases and  decreases in net assets from  operations
during the reporting period. Actual results could differ from those estimates.

Note 3 - Investment Advisory Fee And Other Transactions With Affiliates
Pursuant to an investment advisory agreement, Thornburg Management Company, Inc.
(the "Adviser")  serves as the investment  adviser and performs  services to the
Fund for which the fees are payable at the end of each month. For the year ended
September 30, 1999,  these fees were payable at annual rates ranging from 7/8 of
1% to 27/40 of 1% of the average  daily net assets of the Fund  depending on the
Fund's asset size. The Fund also has an Administrative  Services  Agreement with
the Adviser,  whereby the Adviser will perform certain  administrative  services
for the shareholders of each class of the Fund's shares, and for which fees will
be payable at an annual rate of up to 1/8 of 1% of the average  daily net assets
attributable to each class of shares. For the year ended September 30, 1999, the
Adviser  voluntarily  reimbursed certain operating expenses amounting to $35,996
for the Fund. The Fund has an underwriting  agreements with Thornburg Securities
Corporation  (the  "Distributor"),  which acts as the  Distributor of the Fund's
shares.   For  the  year  ended  September  30,  1999,  the  Distributor  earned
commissions  aggregating  $313,665  from the sale of Class A shares of the Fund,
and  collected  contingent  deferred  sales  charges  aggregating  $25,784  from
redemptions of Class C shares of the Fund. Pursuant to a Service Plan under Rule
12b-1 of the  Investment  Company  Act of 1940,  the Fund may  reimburse  to the
Adviser  an  amount  not to exceed  1/4 of 1% annum of its  average  net  assets
attributable  to each  class of  shares  of the Fund  for  payments  made by the
Adviser to securities dealers and other financial institutions to obtain various
shareholder  related  services.  The  Adviser  may  pay  out  of its  own  funds
additional  expenses for  distribution  of the Fund's shares.  The Fund has also
adopted Distribution Plans pursuant to Rule 12b-1, applicable only to the Fund's
Class C shares under which the Fund  compensated the Distributor for services in
promoting  the sale of Class C shares of the Fund at an annual rate of up to 3/4
of 1% or .75% of the average  daily net assets  attributable  to Class C shares.
Total fees  incurred  by each  class of shares of the Fund under its  respective
Service and  Distribution  Plans for the year ended  September  30, 1999 are set
forth in the statement of operations. Certain officers and trustees of the Trust
are  also  officers  and/or  directors  of  the  Adviser  and  Distributor.  The
compensation of unaffiliated trustees is borne by the Trust.

Notes to financial statements . . . continued

Note 4 - Shares of Beneficial Interest
At  September  30, 1999 there were an unlimited  number of shares of  beneficial
interest  authorized.  Sales of Class I of the Value Fund commenced  November 2,
1998. Transactions in shares of beneficial interest were as follows:
<TABLE>
<CAPTION>

Thornburg Value Fund
                                                        Year Ended September 30, 1999          Year Ended September 30, 1998
                                                       Shares                    Amount             Shares         Amount
Class A Shares
<S>                                                    <C>                   <C>                  <C>          <C>
Shares sold ....................................       9,050,261             $ 232,959,415        5,364,791    $ 114,402,496
Shares issued to shareholders in
         reinvestment of dividends .............          73,730                 1,947,825          290,340        5,509,526
Shares repurchased .............................      (3,074,913)              (76,769,232)      (1,204,237)     (24,377,335)

Net Increase ...................................       6,049,078             $ 158,138,008        4,450,894    $  95,534,687

Class C Shares
Shares sold ....................................       3,233,243             $  83,091,171        1,712,966    $  36,707,174
Shares issued to shareholders
         in reinvestment of distributions ......           7,428                   195,674           37,794          705,580
Shares repurchased .............................        (239,159)               (5,931,965)        (106,131)      (2,182,978)

Net Increase ...................................       3,001,512             $  77,354,880        1,644,629    $  35,229,776

Class I Shares
Shares sold ....................................       2,014,660             $  50,619,712
Shares issued to shareholders
         in reinvestment of distributions ......          11,304                   300,372
Shares repurchased .............................         (31,874)

Net Increase ...................................       1,994,090             $  50,091,345
</TABLE>

Note 5 - Securities Transactions
For the  year  ended  September  30,  1999,  the Fund had  purchases  and  sales
transactions  of  investment   securities  of  $478,369,520  and   $219,711,046,
respectively.
The cost of investments for Federal income tax purpose is  $483,822,925  for the
Fund.
At  September  30,  1999,  net  unrealized   appreciation   of  investments  was
$64,557,941  resulting  from  $90,466,643  gross  unrealized   appreciation  and
$25,908,702 gross unrealized depreciation.
The Fund had the following option contracts written during the year:

                               Number of Contracts        Premium
Balance at begining of year              0                   0
Options written                        300               $ 318,589
Options expired                       (200)               (286,490)
Options assigned                      (100)                (32,099)
Balance at end of year                   0                   0

Note 6 - Financial Investments With Off-Balance Sheet Risk
During the year ended  September  30,  1999,  the Fund was a party to  financial
instruments with off-balance  sheet risks,  primarily  currency forward exchange
contracts.  A forward exchange  contract is an agreement  between two parties to
exchange different currencies at a specified rate at an agreed upon future date.
These  contracts  are  purchased  in order to minimize the risk to the Fund with
respect to its foreign stock holdings from adverse  changes in the  relationship
between the U.S.  dollar and foreign  currencies.  In each case these  contracts
have  been  initiated  in  conjunction   with  foreign  stock  holdings.   These
instruments  may involve market risks in excess of the amount  recognized on the
Statements of Assets and  Liabilities.  Such risks would arise from the possible
inability  of  counterparties  to meet  the  terms of  their  contracts,  future
movement in currency  value and interest  rates and contract  positions that are
not exact  offsets.  The  contract  amounts  indicate  the  extent of the Fund's
involvement in such  contracts.  At September 30, 1999, the Fund had outstanding
forward  exchange  contracts for the sale of currencies as set out below.  These
contracts are reported in the financial  statements at the Fund's net equity, as
measured by the difference  between the forward  exchange rates at the reporting
date and the forward exchange rates at the dates of entry into the contract.

<TABLE>
<CAPTION>
Contracts to sell:
<S>                       <C>                                                            <C>
         15,551,710        Swiss Francs for 10,285,992 U.S. Dollars, December 15, 1999      $ (156,591)
      1,593,052,142        Japanese Yen for 13,731,616 U.S. Dollars, December 15, 1999      (1,367,324)
         35,634,734        Euros for 37,599,219 U.S. Dollars, December 15, 1999               (551,518)
          6,944,125        New Zealand Dollars for 3,798,295 U.S. Dollars, December 15, 1999   198,863

Unrealized loss from forward exchange contracts                                            ($1,876,570)

</TABLE>

<TABLE>
<CAPTION>
Financial highlights
Per share operating performance (for a share outstanding  throughout the period)
                                                                               Year Ended September 30,
                                                                    1999         1998           1997             1996(a)
Class A Shares:
<S>                                                             <C>          <C>          <C>              <C>
Net asset value, beginning of year ..........................   $     19.48  $     20.42  $       14.50    $       11.94

Income from investment operations:
              Net investment income .........................          0.16         0.20           0.21             0.28
              Net realized and unrealized gain on investments          6.76         0.40           6.28             2.56


Total from investment operations ............................          6.92         0.60           6.49             2.84

Less dividends from:
              Net investment income .........................         (0.20)       (0.17)         (0.20)           (0.28)
              Net realized gains ............................          0.00        (1.35)         (0.37)            0.00
              Return of capital .............................          0.00        (0.02)          0.00             0.00

Change in net asset value ...................................          6.72        (0.94)          5.92             2.56

Net asset value, end of year ................................   $     26.20  $     19.48  $       20.42    $       14.50

Total Return (b) ............................................         35.50%        3.15%         46.01%           24.02%

Ratios/Supplemental Data Ratios to average net asset:
              Net investment income .........................          0.62%        0.95%          1.35%            2.48%(c)
              Expenses, after expense reductions ............          1.44%        1.54%          1.61%            1.55%(c)
              Expenses, before expense reductions ...........          1.44%        1.54%          1.61%            2.16%(c)

Portfolio turnover rate .....................................         62.71%       99.55%         78.83%           59.62%

Net assets at end of year (000) .............................    $  360,966  $    150,492   $     66,893       $   15,438


<FN>

(a) Fund commenced operations on October 2, 1995.
(b) Sales loads are not  reflected  in  computing  total  return,  which are not
annualized for periods less than a year.
(c) Annualized.
</FN>
</TABLE>

<TABLE>
<CAPTION>


Class C Shares:                                                  1999           1998           1997         1996(a)
<S>                                                     <C>             <C>            <C>           <C>
Net asset value, beginning of year ..................   $        19.45  $       20.40  $      14.51  $      11.94

Income from investment operations:
              Net investment income .................            (0.01)          0.03          0.07          0.18
              Net realized and unrealized
              gain on investments ...................             6.71           0.39          6.27          2.57


Total from investment operations ....................             6.70           0.42          6.34          2.75

Less dividends from:
              Net investment income .................            (0.07)          0.00         (0.08)        (0.18)
              Net realized gains ....................             0.00          (1.35)         (.37)         0.00
              Return of capital .....................             0.00          (0.02)         0.00          0.00


Change in net asset value ...........................             6.63          (0.95)         5.89          2.57

Net asset value, end of year ........................   $        26.08  $       19.45  $      20.40  $      14.51

Total Return (b) ....................................            34.45%          2.34%        44.77%        23.20%

Ratios/Supplemental Data Ratios to average net asset:
         Net investment income ......................            (0.17)%         0.14%         0.48%         1.73%(c)
         Expenses, after expense reductions .........             2.23%          2.36%         2.49%         2.30%(c)
         Expenses, before expense reductions ........             2.23%          2.37%         2.73%         6.51%(c)

Portfolio turnover rate .............................            62.71%         99.55%        78.83%        59.62%

Net assets at end of year (000) .....................   $       133,934     $   41,513     $   9,999     $   1,267

<FN>


(a) Fund commenced operations on October 2, 1995.
(b) Sales loads are not  reflected  in  computing  total  return,  which are not
annualized for periods less than a year.
(c) Annualized.
</FN>
</TABLE>


Class I Shares:
Net asset value, beginning of period ........................   $   21.78

Income from investment operations:
              Net investment income .........................        0.25
              Net realized and unrealized gain on investments        4.48


Total from investment operations ............................        4.73

Less dividends from:
              Net investment income .........................       (0.25)

Change in net asset value ...................................        4.48

Net asset value, end of period ..............................   $   26.26

Total Return (b) ............................................       21.70%

Ratios/Supplemental Data Ratios to average net asset:
         Net investment income ..............................        1.14%(c)
         Expenses, after expense reductions .................        1.00%(c)
         Expenses, before expense reductions ................        1.13%(c)

Portfolio turnover rate .....................................       62.71%

Net assets at end of period (000) ....................   $         52,357


(a)  Commencment of operations.
(b) Sales loads are not  reflected  in  computing  total  return,  which are not
annualized for periods less than a year. (c) Annualized
<TABLE>
<CAPTION>

Schedule of Investments
Thornburg Value Fund
September 30, 1999    CUSIPS:  Class A - 885-215-731, Class C -
885-215-715, Class I - 885-215-632
NASDAQ Symbols:  Class A - TVAFX, Class C - TVCFX, Class I - TVIFX
COMMON STOCKS--73.40%
<S>                                                                         <C>             <C>
BANKING INSTITUTIONS (3.80%)
Bank Austria AG                                                             190,839          $9,493,154
Hudson City Bancorp Inc.                                                    475,000          6,531,250
Unionbancal Corp.                                                           298,000          10,802,500
BIOTECHNOLOGY (2.00%)
Genzyme Corp.                                                               311,000          14,014,438
CONSUMER ELECTRONICS (2.30%)
Sony Corp.                                                                  52,800           7,867,091
Sony Corp. - ADR                                                            55,000           8,253,438
BUILDING MATERIALS (1.80%)
Dyckerhoff AG Preferred                                                     403,000          12,392,664
CAPITAL EQUIPMENT (1.80%)
Boeing Co.                                                                  290,000          12,361,250
CHEMICALS (3.40%)
Dow Chemical Corp.                                                          112,500          12,782,812
Hercules Inc.                                                               402,100          11,510,113
TELECOMMUNICATION SERVICES (0.90%)
SBA Communcations Corp. +                                                   600,000          6,525,000
PHARMACEUTICALS (2.50%)
Eli Lilly & Company                                                         275,000          17,600,000
ENERGY (3.50%)
Atlantic Richfield Co.                                                      205,000          18,168,125
Occidental Petroleum Corp.                                                  290,000          6,706,250
ENTERTAINMENT (1.60%)
Fox Entertainment Group Inc. +                                              537,600          11,356,800
FOOD & BEVERAGES (1.80%)
Pepsico Inc.                                                                425,000          12,856,250
NATURAL GAS PIPELINES (2.80%)
El Paso Energy Corp.                                                        488,200          19,436,463
HEALTHCARE SERVICES (1.90%)
Health Management Assoc. +                                                  1,800,000        13,323,384
HOUSEHOLD PRODUCTS (0.70%)
Henkel KGaA Preferred                                                       82,600           5,185,538
INVESTMENT MANAGEMENT & BROKERAGE (6.80%)
Charles Schwab and Co.                                                      260,000          8,758,750
Ing Groep N.V.                                                              178,022          9,660,634
Investment Technology Group                                                 355,869          8,184,987
Julius Baer Holding AG                                                      3,403            10,078,769
Pimco Advisors Holdings L. P.                                               365,000          11,497,500
RAILROADS (1.40%)
Union Pacific Corp.                                                         201,600          9,689,400
REAL ESTATE INVESTMENT TRUSTS (2.60%)
JDN Realty Corp.                                                            480,000          9,830,743
Sun Communities Inc.                                                        259,500          8,579,719
RETAIL (2.00%)
CVS Corp.                                                                   350,000          14,284,375
TECHNOLOGY - SEMI CONDUCTORS & EQUIPMENT (8.20%)
Applied Materials Inc.                                                      145,000          11,291,875
Brooks Automation Inc. +                                                    298,200          5,237,137
Dallas Semiconductor Corp.                                                  130,000          6,946,875
Intel Corp.                                                                 230,000          17,091,875
Lam Research Corp. +                                                        290,000          17,690,000
TECHNOLOGY - COMPUTERS & PERIPHERALS (3.90%)
Diebold Inc.                                                                496,700          11,486,187
Seagate Technology Inc. +                                                   230,000          7,086,875
Sun Microsystems Inc. +                                                     100,000          9,300,000
TECHNOLOGY - SOFTWARE & SERVICES (3.20%)
Advent Software, Inc. +                                                     228,750          14,239,688
Macromedia Inc. +                                                           200,000          8,200,795
TECHNOLOGY - CONSULTING (0.30%)
US WEB +                                                                    65,000           2,204,225
TELECOMMUNICATION SERVICES (6.50%)
Bell Atlantic Corp.                                                         373,800          25,161,412
Telecom Corporation Of New Zealand ADR                                      109,300          3,497,600
U. S. West Inc.                                                             300,000          17,118,750
TELECOMMUNICATION EQUIPMENT (5.50%)
Newbridge Networks Corp. +                                                  505,000          13,161,562
Nokia Corp.                                                                 30,000           2,684,274
Nortel Networks Corp.                                                       450,000          22,950,000
TRANSPORTATION SERVICES (1.50%)
Avis Rental A Car Inc. +                                                    509,000          10,625,375
TRAVEL SERVICES (0.70%)
Sabre Holdings Corp. +                                                      107,900          4,639,700

TOTAL COMMON STOCKS (Cost $452,963,375)                                                      518,345,602

COMMERCIAL PAPER--3.30%
Bellsouth Telecomm Inc., 5.25% due 10/22/1999                               550,000          548,316
Citicorp Inc., 5.27% due 10/13/1999                                         5,900,000        5,889,636
Citicorp Inc., 5.28% due 10/14/1999                                         5,000,000        4,990,466
Toyota Motor Credit Co., 5.28% due 10/1/1999                                390,000          390,000
Toyota Motor Credit Co., 5.30% due 10/7/1999                                6,095,000        6,089,616
Toyota Motor Credit Co., 5.36% due 10/12/1999                               4,000,000        3,993,449
Toyota Motor Credit Co., 5.33% due 10/21/1999                               1,700,000        1,694,966

TOTAL COMMERCIAL PAPER (Cost $23,596,449)                                                    23,596,449

COMMERCIAL PAPER (0.90%)
American General Finance, 5.25% due 10/4/1999                               500,000          499,781
Ford Motor Credit Corp., 5.27% due 10/5/1999                                2,400,000        2,398,595
Ford Motor Credit Corp., 5.29% due 11/1/1999                                3,000,000        2,986,334
Merrill Lynch Inc., 5.28% due 10/12/1999                                    555,000          554,105

TOTAL COMMERCIAL PAPER (Cost $6,438,815)                                                     6,438,815


TOTAL INVESTMENTS   (Cost $482,998,639)*                                                     $ 548,380,866
<FN>

+   Non-income producing.
   See notes to financial statements.

</FN>
</TABLE>



Independent Auditor's Report

To the Board of Trustees and  Shareholders of Thornburg  Investment Trust In our
opinion,  the accompanying  statement of assets and  liabilities,  including the
schedule of investments, and the related statements of operations and of changes
in net assets and the  financial  highlights  present  fairly,  in all  material
respects,  the  financial  position of Thornburg  Value Fund series of Thornburg
Investment  Trust  (hereafter  referred to as the "Fund") at September 30, 1999,
the results of its operations,  the changes in its net assets, and the financial
highlights  for the year then  ended,  in  conformity  with  generally  accepted
accounting  principles.  These  financial  statements  and financial  highlights
(hereafter referred to as "financial  statements") are the responsibility of the
Fund's  management;  our  responsibility  is to  express  an  opinion  on  these
financial  statements  based  on our  audit.  We  conducted  our  audit of these
financial  statements in accordance with generally accepted auditing  standards,
which require that we plan and perform the audit to obtain reasonable  assurance
about whether the financial  statements  are free of material  misstatement.  An
audit includes examining,  on a test basis,  evidence supporting the amounts and
disclosures in the financial  statements,  assessing the  accounting  principles
used and  significant  estimates made by management,  and evaluating the overall
financial  statement  presentation.  We believe that our audit,  which  included
confirmation  of  securities at September  30, 1999 by  correspondence  with the
custodian  and brokers,  provides a reasonable  basis for the opinion  expressed
above. The financial statements for the year ended September 30, 1998, including
the  financial  highlights  for each of the four years in the period then ended,
were audited by other  independent  accountants  whose report dated  October 23,
1998  expressed  an   unqualified   opinion  on  those   financial   statements.
PricewaterhouseCoopers LLP New York, New York October 29, 1999

change in Independent accountants

Thornburg Investment Trust
On August 13, 1999,  McGladrey & Pullen, LLP (McGladrey) resigned as independent
auditors of the Fund  pursuant to an  agreement  by  PricewaterhouseCoopers  LLP
(PwC) to acquire McGladrey's investment company practice. The McGladrey partners
and  professionals  serving the Fund at the time of the acquisition  joined PwC.
The reports of McGladrey on the financial statements of the Fund during the past
two fiscal years contained no adverse opinion or disclaimer of opinion, and were
not  qualified  or  modified  as  to  uncertainty,  audit  scope  or  accounting
principles.  In connection  with its audits for the two most recent fiscal years
and through August 13, 1999, there were no  disagreements  with McGladrey on any
matter of accounting principle or practices,  financial statement disclosure, or
auditing  scope  or  procedure,  which  disagreements,  if not  resolved  to the
satisfaction  of McGladrey would have caused it to make reference to the subject
matter of disagreement in connection with its report. On September 22, 1999, the
Fund,  with the  approval  of its Board of  Directors  and its Audit  Committee,
engaged PwC as its independent auditor.  Index Comparisons  Thornburg Value Fund
Index Comparison Compares performance of Thornburg Value Fund and the Standard &
Poor's 500 Index for the period  October 1, 1995 to  September  30,  1999.  Past
performance  of the  Index  and  the  Fund  may  not  be  indicative  of  future
performance.












Class A Shares
Average Annual Total Returns (at max. offering price) (periods ended 9/30/99)
One Year:                           29.39%
Three Year                          24.94%
Since Inception (10/1/95):          24.73%












Class C Shares
Average Annual Total Returns (periods ending 9/30/99)
One Year:                           34.45%
Three Years:                        Letter to shareholders
William V. Fries, CFA
Portfolio Manager
Dear Fellow Shareholders,
The fiscal year ended  September 30 was excellent for the Thornburg  Value Fund.
The results for the calendar  year-to-date  and since inception are shown in the
table  below.  Since  the end of the  fiscal  year  investment  performance  has
continued  to be healthy.  Total  return  performance  as of 9/30/99  Inception:
11/2/98 I Shares

Net Asset Value    Cal. YTD          1 Year*   3 Years*  Since Incept.*
                    13.42%          35.99%    27.02%**  26.28%**







Past  performance  cannot  guarantee  future results.  * Reflects  purchase of A
Shares at NAV until I Share inception of 11/2/98 ** Annualized.


Y2k Update
We Are Ready for the Year 2000

Dear Shareholder,

I wish to inform you about our success with respect to being Year 2000 compliant
in the computer  systems used to manage your Thornburg  funds  investment.  Your
shareholder  records  are  kept  on a large  computer  system  belonging  to our
transfer  agent,  DST Systems.  Accounting  data  pertaining to your  investment
portfolio  reside  on  large  systems  belonging  to State  Street  Bank and its
affiliates. We have smaller computer networks at Thornburg Investment Management
to help us  organize  and  manage our  investment  activities.  I will  describe
briefly the Year 2000 status of each area.

Shareholder  records for  Thornburg  funds are kept on computers  that use a DST
software  system called "TA 2000." DST is one of the largest  mutual fund record
processors in the world,  keeping shareholder records for many large mutual fund
families.  The TA 2000 system,  as is name implies,  was built with 4-digit year
description  fields  in order to be Year 2000  compliant.  To quote  from  DST's
February 1999  newsletter,  "Internal 2000 readiness  testing of TA 2000 and TRA
2000 is complete.  Several retests of critical TA 2000 (and TRAC 2000) functions
were also completed  successfully in 1998. With the completion of these internal
tests,  the TA 2000 (and TRAC 2000)  systems  are  considered  to be Y2K ready."
There are no hedge words in the preceeding 3 sentences!  I am not  surprised.  I
first  heard DST talk about  taking  concrete  measures  to deal with Y2K issues
about 8 years ago. If you worry about  electric power  continuity,  I can inform
you that DST maintains its own diesel powered backup generating station adjacent
to its computer facility.
Both are located in geologically stable limestone caves east of Kansas City.

Asset custody and fund  accounting  records of the Thornburg funds are stored on
State Street Bank computers.  We use a variety of software  systems to carry out
all activities relating to running the funds. We are informed that this software
infrastructure has been 100% tested and corrected to be Year 2000 compliant. You
can monitor State Street  Bank's  disclosure  yourself on the internet  website,
statestreet.com.

Thornburg Investment  Management has a computer network to help us carry out our
daily  business  of managing  the assets in our mutual  funds.  Our  information
technology  director,  Stewart Kane,  has made a great effort to be certain that
our software platforms are Year 2000 compliant.

We look forward to the new year.




Brian McMahon
President, Thornburg Investment Management

Investment Manager
Thornburg Investment Management, Inc.
119 East Marcy Street
Santa Fe, New Mexico 87501
800.847.0200

Principal Underwriter
Thornburg Securities Corporation
119 East Marcy Street
Santa Fe, New Mexico 87501
800.847.0200
This report is submitted for the general information of the
shareholders  of the Fund. It is not authorized for  distribution to prospective
investors in the Fund unless preceded or accompanied by an effective prospectus,
which  includes  information  regarding  the  Fund's  objectives  and  policies,
experience of its management,  marketability of shares,  and other  information.
Performance  data quoted  represent past performance and do not guarantee future
results.





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