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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549 SCHEDULE 13G Under t he Secur i t i es Exchange Act of 1934 ( Amendment No. 3) * Al coa Cor por at i on ( Name of I ssuer ) Common St ock ( Ti t l e of Cl ass of Secur i t i es) 013872106 ( CUSI P Number ) December 31, 2019 ( Dat e of Event Whi ch Requi r es Fi l i ng of t hi s St at ement ) Check t he appr opr i at e box t o desi gnat e t he r ul e pur suant t o whi ch t hi s Schedul e i s f i l ed: [ X] Rul e 13d- 1( b) [ ] Rul e 13d- 1( c) [ ] Rul e 13d- 1( d) *The r emai nder of t hi s cover page shal l be f i l l ed out f or a r epor t i ng per son' s i ni t i al f i l i ng on t hi s f or m wi t h r espect t o t he subj ect cl ass of secur i t i es, and f or any subsequent amendment cont ai ni ng i nf or mat i on whi ch woul d al t er t he di scl osur es pr ovi ded i n a pr i or cover page. The i nf or mat i on r equi r ed i n t he r emai nder of t hi s cover page shal l not be deemed t o be "f i l ed" f or t he pur pose of Sect i on 18 of t he Secur i t i es Exchange Act of 1934 ( "Act ") or ot her wi se subj ect t o t he l i abi l i t i es of t hat sect i on of t he Act but shal l be subj ect t o al l ot her pr ovi si ons of t he Act ( however , see t he Not es) . CUSI P: 013872106 Page 1 of 4

NAMES OF REPORTI NG PERSONS 1 I . R. S. I DENTI FI CATI ON NOS. OF ABOVE PERSONS ( ENTI TI ES ONLY) Capi t al Worl d Invest ors ** CHECK THE APPROPRI ATE BOX I F A MEMBER OF A GROUP ( SEE I NSTRUCTI ONS) 2 ( a) ( b) SEC USE ONLY 3 CI TI ZENSHI P OR PLACE OF ORGANI ZATI ON 4 Del aware SOLE VOTI NG POWER 5 12, 449, 964 SHARED VOTI NG POWER 6 NUMBER OF SHARES NONE BENEFICIALLY OWNED BY SOLE DI SPOSI TI VE POWER 7 EACH REPORTING 12, 449, 964 PERSON WITH: SHARED DI SPOSI TI VE POWER 8 NONE AGGREGATE AMOUNT BENEFI CI ALLY OWNED BY EACH REPORTI NG PERSON 9 12, 449, 964 Benef i ci al owner shi p di scl ai med pur suant t o Rul e 13d- 4 CHECK BOX I F THE AGGREGATE AMOUNT I N ROW ( 9) EXCLUDES CERTAI N SHARES ( SEE I NSTRUCTI ONS) 10 PERCENT OF CLASS REPRESENTED BY AMOUNT I N ROW 9 11 6. 7% TYPE OF REPORTI NG PERSON ( SEE I NSTRUCTI ONS) 12 IA ** A di vi si on of Capi t al Resear ch and Management Company ( CRMC) CUSI P: 013872106 Page 2 of 4 SECURITIES AND EXCHANGE COMMISSION Washi ngt on, DC 20549 Schedul e 13G Under t he Securi t i es Exchange Act of 1934 Amendment No. 3 I t em 1( a) Name of I ssuer : Al coa Cor por at i on I t em 1( b) Addr ess of I ssuer ' s Pr i nci pal Execut i ve Of f i ces: 201 I sabel l a St r eet , Sui t e 500 Pi t t sbur gh, PA 15212 I t em 2( a) Name of Per son( s) Fi l i ng: Capi t al Wor l d I nvest or s I t em 2( b) Addr ess of Pr i nci pal Busi ness Of f i ce or , i f none, Resi dence: 333 Sout h Hope St r eet Los Angel es, CA 90071 I t em 2( c) Ci t i zenshi p: N/ A I t em 2( d) Ti t l e of Cl ass of Secur i t i es: Common St ock I t em 2( e) CUSI P Number : 013872106 I t em 3 I f t hi s st at ement i s f i l ed pur suant t o sect i ons 240. 13d- 1( b) or 240. 13d- 2( b) or ( c) , check whet her t he per son f i l i ng i s a: ( e) [ X] An i nvest ment advi ser i n accor dance wi t h sect i on 240. 13d- 1( b) ( 1) ( i i ) ( E) . I t em 4 Owner shi p Pr ovi de t he f ol l owi ng i nf or mat i on r egar di ng t he aggr egat e number and per cent age of t he cl ass of secur i t i es of t he i ssuer i dent i f i ed i n I t em 1. ( a) Amount benef i ci al l y owned: ( b) Per cent of cl ass: ( c) Number of shar es as t o whi ch t he per son has: ( i ) Sol e power t o vot e or t o di r ect t he vot e: ( i i ) Shar ed power t o vot e or t o di r ect t he vot e: ( i i i ) Sol e power t o di spose or t o di r ect t he di sposi t i on of : ( i v) Shar ed power t o di spose or t o di r ect t he di sposi t i on of : See page 2 Capi t al Wor l d I nvest or s di vi si ons of CRMC and Capi t al I nt er nat i onal Li mi t ed col l ect i vel y pr ovi de i nvest ment management ser vi ces under t he name Capi t al Wor l d I nvest or s. Capi t al Wor l d I nvest or s i s deemed t o be t he benef i ci al owner of 12, 449, 964 shar es or 6. 7% of t he 185, 572, 917 shar es bel i eved t o be out st andi ng. I t em 5 Owner shi p of Fi ve Per cent or Less of a Cl ass. I f t hi s st at ement i s bei ng f i l ed t o r epor t t he f act t hat as of t he dat e her eof t he r epor t i ng per son has ceased t o be t he benef i ci al owner of mor e t han f i ve per cent of t he cl ass of secur i t i es, check t he f ol l owi ng: [ ] I t em 6 Owner shi p of Mor e t han Fi ve Per cent on Behal f of Anot her Per son: N/ A I t em 7 I dent i f i cat i on and Cl assi f i cat i on of t he Subsi di ar y Whi ch Acqui r ed t he Secur i t y Bei ng Repor t ed on By t he Par ent Hol di ng Company or Cont r ol Per son: N/ A CUSI P: 013872106 Page 3 of 4 I t em 8 I dent i f i cat i on and Cl assi f i cat i on of Member s of t he Gr oup: N/ A I t em 9 Not i ce of Di ssol ut i on of Gr oup: N/ A I t em 10 Cer t i f i cat i on By si gni ng bel ow, I cer t i f y t hat , t o t he best of my knowl edge and bel i ef , t he secur i t i es r ef er r ed t o above wer e acqui r ed and ar e hel d i n t he or di nar y cour se of busi ness and wer e not acqui r ed and ar e not hel d f or t he pur pose of or wi t h t he ef f ect of changi ng or i nf l uenci ng t he cont r ol of t he i ssuer of t he secur i t i es and wer e not acqui r ed and ar e not hel d i n connect i on wi t h or as a par t i ci pant i n any t r ansact i on havi ng t hat pur pose or ef f ect . Si gnat ur e Af t er r easonabl e i nqui r y and t o t he best of my knowl edge and bel i ef , I cer t i f y t hat t he i nf or mat i on set f or t h i n t hi s st at ement i s t r ue, compl et e and cor r ect . Dat e: Januar y 10, 2020 Si gnat ur e: / s/ Mi chael J. Tr i essl Name/ Ti t l e: Mi chael J. Tr i essl - Seni or Vi ce Pr esi dent and Seni or Counsel , Fund Busi ness Management Gr oup Capi t al Resear ch and Management Company CUSI P: 013872106 Page 4 of 4