<SEC-DOCUMENT>0001387131-21-000064-index.html : 20210105 <SEC-HEADER>0001387131-21-000064.hdr.sgml : 20210105 <ACCEPTANCE-DATETIME>20210105111437 ACCESSION NUMBER: 0001387131-21-000064 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 2 FILED AS OF DATE: 20210105 DATE AS OF CHANGE: 20210105 EFFECTIVENESS DATE: 20210105 FILER: COMPANY DATA: COMPANY CONFORMED NAME: THORNBURG INVESTMENT TRUST CENTRAL INDEX KEY: 0000816153 IRS NUMBER: 061158764 STATE OF INCORPORATION: MA FISCAL YEAR END: 0930 FILING VALUES: FORM TYPE: 497 SEC ACT: 1933 Act SEC FILE NUMBER: 033-14905 FILM NUMBER: 21504341 BUSINESS ADDRESS: STREET 1: 2300 NORTH RIDGETOP ROAD CITY: SANTA FE STATE: NM ZIP: 87506-8361 BUSINESS PHONE: 5059840200 MAIL ADDRESS: STREET 1: 2300 NORTH RIDGETOP ROAD CITY: SANTA FE STATE: NM ZIP: 87506-8361 FORMER COMPANY: FORMER CONFORMED NAME: THORNBURG INCOME TRUST DATE OF NAME CHANGE: 19920703 FORMER COMPANY: FORMER CONFORMED NAME: LIMITED TERM TRUST DATE OF NAME CHANGE: 19870816 <SERIES-AND-CLASSES-CONTRACTS-DATA> <EXISTING-SERIES-AND-CLASSES-CONTRACTS> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000000540 <SERIES-NAME>Thornburg Limited Term Municipal Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000001427 <CLASS-CONTRACT-NAME>Thornburg Limited Term Municipal Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>LTMFX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000001438 <CLASS-CONTRACT-NAME>Thornburg Limited Term Municipal Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>LTMCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000001449 <CLASS-CONTRACT-NAME>Thornburg Limited Term Municipal Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>LTMIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000222321 <CLASS-CONTRACT-NAME>Thornburg Limited Term Municipal Fund - Class C2 <CLASS-CONTRACT-TICKER-SYMBOL>LTMQX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011841 <SERIES-NAME>Thornburg California Limited Term Municipal Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032344 <CLASS-CONTRACT-NAME>Thornburg California Limited Term Municipal Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>LTCAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032345 <CLASS-CONTRACT-NAME>Thornburg California Limited Term Municipal Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>LTCCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032346 <CLASS-CONTRACT-NAME>Thornburg California Limited Term Municipal Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>LTCIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000222322 <CLASS-CONTRACT-NAME>Thornburg California Limited Term Municipal Fund - Class C2 <CLASS-CONTRACT-TICKER-SYMBOL>LTCQX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011842 <SERIES-NAME>Thornburg Limited Term U.S. Government Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032347 <CLASS-CONTRACT-NAME>Thornburg Limited Term U.S. Government Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>LTUSX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032349 <CLASS-CONTRACT-NAME>Thornburg Limited Term U.S. Government Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>LTUCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032350 <CLASS-CONTRACT-NAME>Thornburg Limited Term U.S. Government Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>LTUIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042666 <CLASS-CONTRACT-NAME>Thornburg Limited Term U.S. Government Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>LTURX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000113847 <CLASS-CONTRACT-NAME>Thornburg Limited Term U.S. Government Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>LTGRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000136848 <CLASS-CONTRACT-NAME>Thornburg Limited Term U.S. Government Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>LTUGX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000222323 <CLASS-CONTRACT-NAME>Thornburg Limited Term U.S. Government Fund - Class C2 <CLASS-CONTRACT-TICKER-SYMBOL>LTUQX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011843 <SERIES-NAME>Thornburg New Mexico Intermediate Municipal Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032352 <CLASS-CONTRACT-NAME>Thornburg New Mexico Intermediate Municipal Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>THNMX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032353 <CLASS-CONTRACT-NAME>Thornburg New Mexico Intermediate Municipal Fund - Class D <CLASS-CONTRACT-TICKER-SYMBOL>THNDX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042667 <CLASS-CONTRACT-NAME>Thornburg New Mexico Intermediate Municipal Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>THNIX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011844 <SERIES-NAME>Thornburg Intermediate Municipal Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032354 <CLASS-CONTRACT-NAME>Thornburg Intermediate Municipal Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>THIMX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032355 <CLASS-CONTRACT-NAME>Thornburg Intermediate Municipal Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>THMCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032356 <CLASS-CONTRACT-NAME>Thornburg Intermediate Municipal Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>THMIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000222324 <CLASS-CONTRACT-NAME>Thornburg Intermediate Municipal Fund - Class C2 <CLASS-CONTRACT-TICKER-SYMBOL>THMQX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011845 <SERIES-NAME>Thornburg Limited Term Income Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032357 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>THIFX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032358 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>THICX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032359 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>THIIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042668 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>THIRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000113848 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>THRRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000136849 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>THRIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000177478 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class R6 <CLASS-CONTRACT-TICKER-SYMBOL>THRLX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000222325 <CLASS-CONTRACT-NAME>Thornburg Limited Term Income Fund - Class C2 <CLASS-CONTRACT-TICKER-SYMBOL>THIQX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011846 <SERIES-NAME>Thornburg Small/Mid Cap Core Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032361 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Core Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>TVAFX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032363 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Core Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>TVCFX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032364 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Core Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TVIFX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032366 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Core Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>TVRRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042669 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Core Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>TVIRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042670 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Core Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>TVRFX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011848 <SERIES-NAME>Thornburg New York Intermediate Municipal Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032368 <CLASS-CONTRACT-NAME>Thornburg New York Intermediate Municipal Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>THNYX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000083544 <CLASS-CONTRACT-NAME>Thornburg New York Intermediate Municipal Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TNYIX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011849 <SERIES-NAME>Thornburg International Value Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032369 <CLASS-CONTRACT-NAME>Thornburg International Value Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>TGVAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032371 <CLASS-CONTRACT-NAME>Thornburg International Value Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>THGCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032372 <CLASS-CONTRACT-NAME>Thornburg International Value Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TGVIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032374 <CLASS-CONTRACT-NAME>Thornburg International Value Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>TIVRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042671 <CLASS-CONTRACT-NAME>Thornburg International Value Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>THVRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042672 <CLASS-CONTRACT-NAME>Thornburg International Value Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>TGVRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000113849 <CLASS-CONTRACT-NAME>Thornburg International Value Fund - Class R6 <CLASS-CONTRACT-TICKER-SYMBOL>TGIRX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011850 <SERIES-NAME>Thornburg Small/Mid Cap Growth Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032375 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Growth Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>THCGX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032376 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Growth Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>TCGCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032377 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Growth Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>THIGX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032379 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Growth Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>THGRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042673 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Growth Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>TCGRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042674 <CLASS-CONTRACT-NAME>Thornburg Small/Mid Cap Growth Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>THCRX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000011851 <SERIES-NAME>Thornburg Investment Income Builder Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032380 <CLASS-CONTRACT-NAME>Thornburg Investment Income Builder Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>TIBAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032381 <CLASS-CONTRACT-NAME>Thornburg Investment Income Builder Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>TIBCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000032382 <CLASS-CONTRACT-NAME>Thornburg Investment Income Builder Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TIBIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042675 <CLASS-CONTRACT-NAME>Thornburg Investment Income Builder Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>TIBRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000047041 <CLASS-CONTRACT-NAME>Thornburg Investment Income Builder Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>TIBMX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000058461 <CLASS-CONTRACT-NAME>Thornburg Investment Income Builder Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>TIBGX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000177479 <CLASS-CONTRACT-NAME>Thornburg Investment Income Builder Fund - Class R6 <CLASS-CONTRACT-TICKER-SYMBOL>TIBOX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000012859 <SERIES-NAME>Thornburg Global Opportunities Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000034775 <CLASS-CONTRACT-NAME>Thornburg Global Opportunities Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>THOAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000034776 <CLASS-CONTRACT-NAME>Thornburg Global Opportunities Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>THOCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000034777 <CLASS-CONTRACT-NAME>Thornburg Global Opportunities Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>THOIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000058462 <CLASS-CONTRACT-NAME>Thornburg Global Opportunities Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>THORX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000058463 <CLASS-CONTRACT-NAME>Thornburg Global Opportunities Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>THOVX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000058464 <CLASS-CONTRACT-NAME>Thornburg Global Opportunities Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>THOFX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000177480 <CLASS-CONTRACT-NAME>Thornburg Global Opportunities Fund - Class R6 <CLASS-CONTRACT-TICKER-SYMBOL>THOGX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000015648 <SERIES-NAME>Thornburg International Growth Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042663 <CLASS-CONTRACT-NAME>Thornburg International Growth Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TINGX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042664 <CLASS-CONTRACT-NAME>Thornburg International Growth Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>TIGAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000042665 <CLASS-CONTRACT-NAME>Thornburg International Growth Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>TIGCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000058465 <CLASS-CONTRACT-NAME>Thornburg International Growth Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>TIGVX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000058466 <CLASS-CONTRACT-NAME>Thornburg International Growth Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>TINVX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000058467 <CLASS-CONTRACT-NAME>Thornburg International Growth Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>TINFX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000123223 <CLASS-CONTRACT-NAME>Thornburg International Growth Fund - Class R6 <CLASS-CONTRACT-TICKER-SYMBOL>THGIX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000020097 <SERIES-NAME>Thornburg Strategic Income Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000056389 <CLASS-CONTRACT-NAME>Thornburg Strategic Income Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>TSIAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000056390 <CLASS-CONTRACT-NAME>Thornburg Strategic Income Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>TSICX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000056391 <CLASS-CONTRACT-NAME>Thornburg Strategic Income Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TSIIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000113850 <CLASS-CONTRACT-NAME>Thornburg Strategic Income Fund - Class R3 <CLASS-CONTRACT-TICKER-SYMBOL>TSIRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000113851 <CLASS-CONTRACT-NAME>Thornburg Strategic Income Fund - Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>TSRRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000136850 <CLASS-CONTRACT-NAME>Thornburg Strategic Income Fund - Class R4 <CLASS-CONTRACT-TICKER-SYMBOL>TSRIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000177481 <CLASS-CONTRACT-NAME>Thornburg Strategic Income Fund - Class R6 <CLASS-CONTRACT-TICKER-SYMBOL>TSRSX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000025152 <SERIES-NAME>Thornburg Strategic Municipal Income Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000075018 <CLASS-CONTRACT-NAME>Thornburg Strategic Municipal Income Fund Class A <CLASS-CONTRACT-TICKER-SYMBOL>TSSAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000075019 <CLASS-CONTRACT-NAME>Thornburg Strategic Municipal Income Fund Class C <CLASS-CONTRACT-TICKER-SYMBOL>TSSCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000075020 <CLASS-CONTRACT-NAME>Thornburg Strategic Municipal Income Fund Class I <CLASS-CONTRACT-TICKER-SYMBOL>TSSIX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000027135 <SERIES-NAME>Thornburg Developing World Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000081859 <CLASS-CONTRACT-NAME>Thornburg Developing World Fund Class A <CLASS-CONTRACT-TICKER-SYMBOL>THDAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000081860 <CLASS-CONTRACT-NAME>Thornburg Developing World Fund Class C <CLASS-CONTRACT-TICKER-SYMBOL>THDCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000081861 <CLASS-CONTRACT-NAME>Thornburg Developing World Fund Class I <CLASS-CONTRACT-TICKER-SYMBOL>THDIX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000123224 <CLASS-CONTRACT-NAME>Thornburg Developing World Fund Class R5 <CLASS-CONTRACT-TICKER-SYMBOL>THDRX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000123225 <CLASS-CONTRACT-NAME>Thornburg Developing World Fund Class R6 <CLASS-CONTRACT-TICKER-SYMBOL>TDWRX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000043669 <SERIES-NAME>Thornburg Short Duration Municipal Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000135383 <CLASS-CONTRACT-NAME>Thornburg Short Duration Municipal Fund Class A <CLASS-CONTRACT-TICKER-SYMBOL>TLMAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000135384 <CLASS-CONTRACT-NAME>Thornburg Short Duration Municipal Fund Class I <CLASS-CONTRACT-TICKER-SYMBOL>TLMIX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000043670 <SERIES-NAME>Thornburg Ultra Short Income Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000135385 <CLASS-CONTRACT-NAME>Thornburg Ultra Short Income Fund Class A <CLASS-CONTRACT-TICKER-SYMBOL>TLDAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000135386 <CLASS-CONTRACT-NAME>Thornburg Ultra Short Income Fund Class I <CLASS-CONTRACT-TICKER-SYMBOL>TLDIX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000050704 <SERIES-NAME>Thornburg Better World International Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000160136 <CLASS-CONTRACT-NAME>Thornburg Better World International Fund - Class A <CLASS-CONTRACT-TICKER-SYMBOL>TBWAX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000160137 <CLASS-CONTRACT-NAME>Thornburg Better World International Fund - Class C <CLASS-CONTRACT-TICKER-SYMBOL>TBWCX </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000160138 <CLASS-CONTRACT-NAME>Thornburg Better World International Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TBWIX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000056004 <SERIES-NAME>Thornburg Long/Short Equity Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000176362 <CLASS-CONTRACT-NAME>Thornburg Long/Short Equity Fund- Class I <CLASS-CONTRACT-TICKER-SYMBOL>THLSX </CLASS-CONTRACT> </SERIES> <SERIES> <OWNER-CIK>0000816153 <SERIES-ID>S000064930 <SERIES-NAME>Thornburg Summit Fund <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000210187 <CLASS-CONTRACT-NAME>Thornburg Summit Fund - Class A </CLASS-CONTRACT> <CLASS-CONTRACT> <CLASS-CONTRACT-ID>C000210188 <CLASS-CONTRACT-NAME>Thornburg Summit Fund - Class I <CLASS-CONTRACT-TICKER-SYMBOL>TSUMX </CLASS-CONTRACT> </SERIES> </EXISTING-SERIES-AND-CLASSES-CONTRACTS> </SERIES-AND-CLASSES-CONTRACTS-DATA> </SEC-HEADER> <DOCUMENT> <TYPE>497 <SEQUENCE>1 <FILENAME>tbit-497_010521.htm <DESCRIPTION>DEFINITIVE MATERIALS <TEXT> Document 1 - file: tbit-497_010521.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>2 <FILENAME>tbit-497_010521img001.gif <DESCRIPTION>GRAPHIC <TEXT> Document 2 - file: tbit-497_010521img001.gif
</DOCUMENT> </SEC-DOCUMENT>