American Century Ultra Fund - I Class (TWUIX) N-CEN Annual report (registered investment company)

Pursuant to the Fund’s procedures adopted under Rule 10f-3, the Fund’s Board of Directors/Trustees receives a quarterly report in the form of a checklist as to the satisfaction of the applicable conditions of paragraph (c)(1) through (c)(8) of Rule 10f-3.

Fund	Balanced
Issuer	KKR Group Finance Co VII LLC
Ticker/Sedol	48252DAA3
Principal Amount (US$)	$497,370,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$795,792
Amount Purchased (Foreign$)	N/A
Trade Date	2/18/2020
Price (US$)	$99.474
Price-Foreign	N/A
Underwriter	Citigroup Global Markets Inc
Other Syndicate Members:	Goldman Sachs & Co. LLC, Mizuho Securities USA LLC, Morgan Stanley & Co. LLC, KKR Capital Markets LLC, HSBC Securities (USA) Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Credit Suisse Securities (USA) LLC, Deutsche Bank Securities Inc., J.P. Morgan Securities LLC, Nomura Securities International, Inc., RBC Capital Markets, LLC, SMBC Nikko Securities America, Inc., SunTrust Robinson Humphrey, Inc., UBS Securities LLC, Wells Fargo Securities, LLC
Underwriting Spread	0.875%
Currency	USD

Fund	Balanced
Issuer	Bank of America Corp
Ticker/Sedol	06051GJB6
Principal Amount (US$)	$3,000,000,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$500,000
Amount Purchased (Foreign$)	N/A
Trade Date	4/22/2020
Price (US$)	$100
Price-Foreign	N/A
Underwriter	BofA Securities
Other Syndicate Members:	ABN AMRO Securities (USA) LLC, ANZ Securities, Inc., Banca IMI S.p.A., Banco de Sabadell, S.A., BBVA Securities Inc., BMO Capital Markets Corp., BNY Mellon Capital Markets, LLC, Capital One Securities, Inc., CIBC World Markets Corp., Citizens Capital Markets, Inc., Commerz Markets LLC, Commonwealth Bank of Australia, Credit Agricole Securities (USA) Inc., Danske Markets Inc., DBS Bank Ltd., Huntington Securities, Inc., ING Financial Markets LLC, KeyBanc Capital Markets Inc., Lloyds Securities Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc., nabSecurities, LLC, Natixis Securities Americas LLC, NatWest Markets Securities Inc., Nomura Securities International, Inc., Nordea Bank ABP, RB International Markets (USA) LLC, Regions Securities LLC, Santander Investment Securities Inc., Scotia Capital (USA) Inc., SMBC Nikko Securities America, Inc., Standard Chartered Bank, SunTrust Robinson Humphrey, Inc., TD Securities (USA) LLC, UniCredit Capital Markets LLC, Apto Partners, LLC, Drexel Hamilton, LLC
Underwriting Spread	0.45%
Currency	USD

Fund	Balanced
Issuer	Citigroup Inc
Ticker/Sedol	172967MS7
Principal Amount (US$)	$3,500,000,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$390,000
Amount Purchased (Foreign$)	N/A
Trade Date	5/26/2020
Price (US$)	$100
Price-Foreign	N/A
Underwriter	Citigroup Global Markets Inc
Other Syndicate Members:	Banca IMI S.p.A., BMO Capital Markets Corp., Deutsche Bank Securities Inc., Huntington Securities, Inc., Lloyds Securities Inc., NatWest Markets Securities Inc., RBC Capital Markets, LLC, Scotia Capital (USA) Inc., SG Americas Securities, LLC, SMBC Nikko Securities America, Inc., UBS Securities LLC, UniCredit Capital Markets LLC, ABN AMRO Securities (USA) LLC, Academy Securities, Inc., Bank of China Limited, London Branch, BBVA Securities Inc., Cabrera Capital Markets LLC, Capital One Securities, Inc., CastleOak Securities, L.P., CIBC World Markets Corp., Citizens Capital Markets, Inc., Commonwealth Bank of Australia, Credit Suisse Securities (USA) LLC, DBS Bank Ltd., Desjardins Securities Inc., Fifth Third Securities, Inc., HSBC Securities (USA) Inc., ICBC Standard Bank Plc, ING Financial Markets LLC, KeyBanc Capital Markets Inc., Mischler Financial Group, Inc., nabSecurities, LLC, National Bank of Canada Financial Inc., Natixis Securities Americas LLC, Nomura Securities International, Inc., Regions Securities LLC, Roberts & Ryan Investments Inc., Santander Investment Securities Inc., TD Securities (USA) LLC, U.S. Bancorp Investments, Inc.
Underwriting Spread	0.425%
Currency	USD

Fund	Heritage
Issuer	Argenx SE
Ticker/Sedol	ARGX (04016X101)
Principal Amount (US$)	$528,900,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$3,116,205
Amount Purchased (Foreign$)	N/A
Trade Date	5/28/2020
Price (US$)	$205.00
Price-Foreign	N/A
Underwriter	JP Morgan Securities LLC
Other Syndicate Members:	BOFA Securities, Cowen & Co, JMP Securities, Stifel Nicholas Capital, Wedbush Pac Grow Lifesciences, Nomura International
Underwriting Spread	6.00%
Currency	USD

Fund	NT Heritage
Issuer	Argenx SE
Ticker/Sedol	ARGX (04016X101)
Principal Amount (US$)	$528,900,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$342,350
Amount Purchased (Foreign$)	N/A
Trade Date	5/28/2020
Price (US$)	$205.00
Price-Foreign	N/A
Underwriter	JP Morgan Securities LLC
Other Syndicate Members:	BOFA Securities, Cowen & Co, JMP Securities, Stifel Nicholas Capital, Wedbush Pac Grow Lifesciences, Nomura International
Underwriting Spread	6.00%
Currency	USD

Fund	Balanced
Issuer	Apollo Management Holdings, L.P.
Ticker/Sedol	03765HAF8
Principal Amount (US$)	$498,520,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$398,816
Amount Purchased (Foreign$)	N/A
Trade Date	6/02/2020
Price (US$)	$99.704
Price-Foreign	N/A
Underwriter	Citigroup Global Markets Inc
Other Syndicate Members:	Goldman Sachs & Co. LLC, Mizuho Securities USA LLC, Morgan Stanley & Co. LLC, HSBC Securities (USA) Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Credit Suisse Securities (USA) LLC, Deutsche Bank Securities Inc., J.P. Morgan Securities LLC, Nomura Securities International, Inc., RBC Capital Markets, LLC, UBS Securities LLC, Wells Fargo Securities, LLC, Apollo Global Securities, LLC, BNP Paribas Securities Corp., U.S. Bancorp Investments, Inc., MUFG Securities Americas Inc, SG Americas Securities, LLC
Underwriting Spread	0.65%
Currency	USD

Fund	Balanced
Issuer	Bank of America Corp
Ticker/Sedol	06051GJD2
Principal Amount (US$)	$3,000,000,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$680,000
Amount Purchased (Foreign$)	N/A
Trade Date	6/16/2020
Price (US$)	$100
Price-Foreign	N/A
Underwriter	BofA Securities
Other Syndicate Members:	ABN AMRO Securities (USA) LLC, ANZ Securities, Inc., Banca IMI S.p.A.,Bankinter S.A., S.A., BBVA Securities Inc., BMO Capital Markets Corp., Capital One Securities, Inc., CIBC World Markets Corp., Citizens Capital Markets, Inc., Commerz Markets LLC, Commonwealth Bank of Australia, Credit Agricole Securities (USA) Inc., Danske Markets Inc., DBS Bank Ltd., DZ Financial Markets LLC, Huntington Securities, Inc., ICBC Standard Bank PLC, ING Financial Markets LLC, KeyBanc Capital Markets Inc., Lloyds Securities Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc., nabSecurities, LLC, Natixis Securities Americas LLC, NatWest Markets Securities Inc., Nomura Securities International, Inc., Nordea Bank ABP, Rabo Securities USA, Inc., RBC Capital Markets, LLC, RB International Markets (USA) LLC, Regions Securities LLC, Santander Investment Securities Inc., SMBC Nikko Securities America, Inc., SG Americas Securities, LLC, TD Securities (USA) LLC, UniCredit Capital Markets LLC, Academy Securities, Inc., Bancroft Capital, LLC, CastleOak Securities, L.P., Siebert Williams Shank & Co., LLC
Underwriting Spread	0.35%
Currency	USD

Fund	Balanced
Issuer	Bank of America Corp
Ticker/Sedol	06051GJE0
Principal Amount (US$)	$3,000,000,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$600,000
Amount Purchased (Foreign$)	N/A
Trade Date	6/16/2020
Price (US$)	$100
Price-Foreign	N/A
Underwriter	BofA Securities
Other Syndicate Members:	ABN AMRO Securities (USA) LLC, ANZ Securities, Inc., Banca IMI S.p.A.,Bankinter S.A., S.A., BBVA Securities Inc., BMO Capital Markets Corp., Capital One Securities, Inc., CIBC World Markets Corp., Citizens Capital Markets, Inc., Commerz Markets LLC, Commonwealth Bank of Australia, Credit Agricole Securities (USA) Inc., Danske Markets Inc., DBS Bank Ltd., DZ Financial Markets LLC, Huntington Securities, Inc., ICBC Standard Bank PLC, ING Financial Markets LLC, KeyBanc Capital Markets Inc., Lloyds Securities Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc., nabSecurities, LLC, Natixis Securities Americas LLC, NatWest Markets Securities Inc., Nomura Securities International, Inc., Nordea Bank ABP, Rabo Securities USA, Inc., RBC Capital Markets, LLC, RB International Markets (USA) LLC, Regions Securities LLC, Santander Investment Securities Inc., SMBC Nikko Securities America, Inc., Standard Chartered Bank, SG Americas Securities, LLC, TD Securities (USA) LLC, UniCredit Capital Markets LLC, Academy Securities, Inc., Bancroft Capital, LLC, CastleOak Securities, L.P., Siebert Williams Shank & Co., LLC
Underwriting Spread	0.75%
Currency	USD

Fund	Balanced
Issuer	Freddie Mac
Ticker/Sedol	3137EAEX3
Principal Amount (US$)	$4,984,950,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$1,894,281
Amount Purchased (Foreign$)	N/A
Trade Date	9/23/2020
Price (US$)	$99.699
Price-Foreign	N/A
Underwriter	Citigroup
Other Syndicate Members:	Deutsche Bank Securities Inc., Nomura Securities International, Inc., Academy Securities Inc., Bancroft Capital LLC/CA, Blaylock Van LLC, CastleOak Securities, R Seelaus & Co. Inc., Siebert Williams Shank & Co LLC
Underwriting Spread	0.10%
Currency	USD

Fund	Balanced
Issuer	Fannie Mae
Ticker/Sedol	3135G05Y5
Principal Amount (US$)	$3,994,280,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$1,997,140
Amount Purchased (Foreign$)	N/A
Trade Date	10/07/2020
Price (US$)	$99.857
Price-Foreign	N/A
Underwriter	Citigroup Global Markets Inc
Other Syndicate Members:	J.P. Morgan Securities LLC, Nomura Securities International, Inc., Siebert Williams Shank & Co, LLC, Alamo Capital Financial Services, BANCROFT CAPITAL LLC, CastleOak Securities, L.P., MFR Securities, Inc., Multi-Bank Securities, Inc.
Underwriting Spread	0.125%
Currency	USD

Fund	Balanced
Issuer	Bank of America Corporation
Ticker/Sedol	06051GJM2
Principal Amount (US$)	$1,000,000,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$155,000
Amount Purchased (Foreign$)	N/A
Trade Date	10/16/2020
Price (US$)	$100
Price-Foreign	N/A
Underwriter	BofA Securities, Inc.
Other Syndicate Members:	Academy Securities, Inc., ANZ Securities, Inc., BBVA Securities Inc., BMO Capital Markets Corp., Capital One Securities, Inc., CastleOak Securities, L.P., CIBC World Markets Corp., Commerz Markets LLC, Commonwealth Bank of Australia, Danske Markets Inc., DNB Markets, Inc., Drexel Hamilton, LLC, HSBC Securities (USA) Inc., Huntington Securities, Inc., ICBC Standard Bank Plc, ING Financial Markets LLC, Intesa Sanpaolo S.p.A., KeyBanc Capital Markets Inc., Lloyds Securities Inc., MFR Securities, Inc., Mizuho Securities USA LLC, MUFG Securities Americas Inc., nabSecurities, LLC, NatWest Markets Securities Inc., Nomura Securities International, Inc., Nordea Bank ABP, Nykredit Bank A/S, Penserra Securities LLC, PNC Capital Markets LLC, R. Seelaus & Co., LLC, Rabo Securities USA, Inc., Regions Securities LLC, Santander Investment Securities Inc., Scotia Capital (USA) Inc., SMBC Nikko Securities America, Inc., Standard Chartered Bank, Truist Securities, Inc., U.S. Bancorp Investments, Inc., UBS Securities LLC, UniCredit Capital Markets LLC, Westpac Capital Markets LLC
Underwriting Spread	0.875%
Currency	USD

Fund	Small Cap Growth
Issuer	Array Technologies Inc
Ticker/Sedol	ARRY (04271T100)
Principal Amount (US$)	$990,000,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$3,836,206
Amount Purchased (Foreign$)	N/A
Trade Date	10/15/2020
Price (US$)	$22.00
Price-Foreign	N/A
Underwriter	Goldman Sachs
Other Syndicate Members:	Morgan Stanley & Co. LLC, BofA Securities, Inc., Robert W. Baird & Co Incorporated, Guggenheim Securities, LLC, Piper Sandler & Co., William Blair & Company L.L.C., Telsey Advisory Group, Loop Capital Markets LLC, Samuel A. Ramirez & Company, Inc., Amerivet Securities, Inc., Nomura Securities International, Inc., Jefferies & Company, Inc.
Underwriting Spread	5.50%
Currency	USD

Fund	Small Cap Growth
Issuer	Leslie’s Inc
Ticker/Sedol	LESL (527064109)
Principal Amount (US$)	$680,000,000
Principal Amount (Foreign$)	N/A
Amount Purchased (US$)	$1,864,084
Amount Purchased (Foreign$)	N/A
Trade Date	10/29/2020
Price (US$)	$17.00
Price-Foreign	N/A
Underwriter	Goldman Sachs
Other Syndicate Members:	Morgan Stanley & Co. LLC, BofA Securities, Inc., Robert W. Baird & Co Incorporated, Guggenheim Securities, LLC, Piper Sandler & Co., William Blair & Company L.L.C., Telsey Advisory Group, Loop Capital Markets LLC, Samuel A. Ramirez & Company, Inc., Amerivet Securities, Inc., Nomura Securities International, Inc., Jefferies & Company, Inc.
Underwriting Spread	3.45%
Currency	USD