Quantitative Master Series NPORT-P Master Small Cap Index Series (Sep 2021 report)

Schedule of Investments  (unaudited)  September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Common Stocks
Advertising Agencies — 0.4%
Advantage Solutions, Inc.(a)(b)		114,518	$	990,581
Boston Omaha Corp., Class A(a)		27,302		1,058,772
Cardlytics, Inc.(a)		48,784		4,094,929
Chimera Investment Corp.		358,658		5,326,071
Clear Channel Outdoor Holdings, Inc.(a)		547,175		1,482,844
Emerald Holding, Inc.(a)		39,174		170,015
Entercom Communications Corp.(a)		178,691		657,583
Fluent, Inc.(a)		60,797		138,009
National CineMedia, Inc.		97,245		346,192
QuinStreet, Inc.(a)		73,771		1,295,419
Thryv Holdings, Inc.(a)		10,155		305,056
Viad Corp.(a)		31,036		1,409,345
				17,274,816
Aerospace — 0.7%
AAR Corp.(a)		49,540		1,606,582
Aerojet Rocketdyne Holdings, Inc.		113,894		4,960,084
AeroVironment, Inc.(a)		34,922		3,014,467
AerSale Corp.(a)		18,967		322,439
Astronics Corp.(a)		36,144		508,185
Byrna Technologies, Inc.(a)(b)		28,185		616,124
Columbia Property Trust, Inc.		171,652		3,264,821
Ducommun, Inc.(a)(b)		15,716		791,301
Kaman Corp.		42,238		1,506,629
Kratos Defense & Security Solutions, Inc.(a)		190,348		4,246,664
Macerich Co.		322,322		5,386,001
Moog, Inc., Class A		44,564		3,397,114
Triumph Group, Inc.(a)		96,585		1,799,378
				31,419,789
Agriculture, Fishing & Ranching — 0.3%
Andersons, Inc.		47,652		1,469,111
AquaBounty Technologies, Inc.(a)		77,821		316,731
Cadiz, Inc.(a)(b)		33,554		236,220
Calavo Growers, Inc.		25,263		966,057
Cal-Maine Foods, Inc.		56,028		2,025,973
Fresh Del Monte Produce, Inc.		48,904		1,575,687
GrowGeneration Corp.(a)(b)		81,290		2,005,424
Limoneira Co.		25,358		410,039
MedAvail Holdings, Inc.(a)(b)		16,244		47,433
Sanderson Farms, Inc.		30,745		5,786,209
				14,838,884
Air Transport(a) — 0.5%
Air Transport Services Group, Inc.		88,211		2,276,726
Allegiant Travel Co.		23,175		4,530,249
Atlas Air Worldwide Holdings, Inc.		43,298		3,536,581
Frontier Group Holdings, Inc.(b)		52,782		833,428
Hawaiian Holdings, Inc.		76,108		1,648,499
Mesa Air Group, Inc.		50,631		387,833
SkyWest, Inc.		74,603		3,680,912
Spirit Airlines, Inc.		154,234		4,000,830
Sun Country Airlines Holdings, Inc.		26,169		877,708
				21,772,766
Alternative Energy(a) — 0.3%
Aemetis, Inc.(b)		45,137		825,104
Alto Ingredients, Inc.(b)		106,079		524,030
Ameresco, Inc., Class A		46,465		2,714,950
Centrus Energy Corp., Class A		13,577		524,887
Green Brick Partners, Inc.		46,392		951,964

Security	Shares		Value
Alternative Energy (continued)
Green Plains, Inc.		51,340	$	1,676,251
Infrastructure and Energy Alternatives, Inc.(b)		43,682		499,285
REX American Resources Corp.		8,390		670,109
Sunnova Energy International, Inc.(b)		131,841		4,342,843
				12,729,423
Aluminum — 0.2%
Arconic Corp.(a)(b)		167,607		5,286,325
Century Aluminum Co.(a)		85,046		1,143,868
Kaiser Aluminum Corp.		24,030		2,618,309
				9,048,502
Asset Management & Custodian — 1.0%
Artisan Partners Asset Management, Inc., Class A		88,745		4,341,405
Assetmark Financial Holdings, Inc.(a)		25,780		641,149
B. Riley Financial, Inc.		30,730		1,814,299
Brightsphere Investment Group, Inc.		86,025		2,247,833
Cohen & Steers, Inc.		37,827		3,168,768
Cowen, Inc., Class A		43,664		1,498,112
Diamond Hill Investment Group, Inc.		4,531		795,916
Federated Hermes, Inc.		142,200		4,621,500
Focus Financial Partners, Inc., Class A(a)(b)		90,146		4,720,946
GAMCO Investors, Inc., Class A		8,691		229,269
GCM Grosvenor, Inc., Class A		63,017		725,956
Hamilton Lane, Inc., Class A		52,131		4,421,751
Open Lending Corp., Class A(a)		157,147		5,668,292
Oppenheimer Holdings, Inc., Class A		12,887		583,652
PJT Partners, Inc., Class A		36,339		2,874,778
Pzena Investment Management, Inc., Class A		27,206		267,707
Sculptor Capital Management, Inc.		36,904		1,029,253
StepStone Group, Inc., Class A		60,493		2,579,422
Virtus Investment Partners, Inc.		11,204		3,476,825
WisdomTree Investments, Inc.		213,451		1,210,267
				46,917,100
Auto Parts — 1.1%
Adient PLC(a)(b)		143,112		5,931,992
American Axle & Manufacturing Holdings, Inc.(a)		170,779		1,504,563
Canoo, Inc.(a)(b)		162,997		1,253,447
CarParts.com, Inc.(a)		71,843		1,121,469
Dana, Inc.		219,952		4,891,733
Dorman Products, Inc.(a)		40,733		3,856,193
Fisker, Inc.(a)(b)		252,265		3,695,682
Fox Factory Holding Corp.(a)		64,191		9,278,167
Gentherm, Inc.(a)		49,895		4,038,002
Lordstown Motors Corp., Class A(a)(b)		148,389		1,184,144
Meritor, Inc.(a)		105,280		2,243,517
Standard Motor Products, Inc.		31,903		1,394,480
Stoneridge, Inc.(a)		40,062		816,864
Tenneco, Inc., Class A(a)		107,572		1,535,053
Visteon Corp.(a)(b)		42,136		3,977,217
Workhorse Group, Inc.(a)(b)		188,524		1,442,209
XL Fleet Corp.(a)(b)		61,159		376,739
XPEL Inc.(a)(b)		28,102		2,131,818
				50,673,289
Auto Services — 0.2%
Goodyear Tire & Rubber Co.(a)		419,502		7,425,185
Back Office Support, HR & Consulting — 1.5%
ASGN, Inc.(a)		79,111		8,950,619
Atlas Technical Consultants, Inc.(a)		22,742		231,286
Barrett Business Services, Inc.		11,581		883,167
CBIZ, Inc.(a)		77,919		2,519,900

SERIES SCHEDULE OF INVESTMENTS 1

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Back Office Support, HR & Consulting (continued)
Conduent, Inc.(a)		256,673	$	1,691,475
CRA International, Inc.		11,737		1,165,954
ExlService Holdings, Inc.(a)		50,004		6,156,492
Forrester Research, Inc.(a)		17,200		847,272
GP Strategies Corp.(a)		20,881		432,237
Hackett Group, Inc.		38,500		755,370
Heidrick & Struggles International, Inc.		29,596		1,320,869
HireQuest, Inc.		10,587		204,647
Huron Consulting Group, Inc.(a)		34,108		1,773,616
ICF International, Inc.		29,053		2,594,142
Insperity, Inc.		54,612		6,047,733
Kelly Services, Inc., Class A		52,428		989,841
Kforce, Inc.		31,362		1,870,430
Korn Ferry		83,493		6,041,553
Liquidity Services, Inc.(a)		40,114		866,864
Maximus, Inc.		92,838		7,724,122
NV5 Global, Inc.(a)		19,326		1,904,964
PAE, Inc.(a)		112,896		675,118
Rekor Systems, Inc.(a)		46,305		532,044
Resources Connection, Inc.		47,710		752,864
StarTek, Inc.(a)		27,578		151,955
Target Hospitality Corp.(a)		49,812		185,799
TriNet Group, Inc.(a)		61,825		5,847,408
TrueBlue, Inc.(a)		53,309		1,443,608
TTEC Holdings, Inc.		27,782		2,598,450
				67,159,799
Banks: Diversified — 7.6%
1st Source Corp.		25,200		1,190,448
Allegiance Bancshares, Inc.		31,564		1,204,167
Altabancorp.		29,174		1,288,324
Ambac Financial Group, Inc.(a)		68,315		978,271
Amerant Bancorp, Inc.(a)		35,071		867,657
American National Bankshares, Inc.		17,212		568,684
Ameris Bancorp.		102,221		5,303,225
Arrow Financial Corp.		22,514		773,581
Associated Banc-Corp.		231,005		4,948,127
Atlantic Capital Bancshares, Inc.(a)		35,085		929,402
Atlantic Union Bankshares Corp.		114,822		4,231,191
BancFirst Corp.		27,025		1,624,743
Banco Latinoamericano de Comercio Exterior SA, Class E		48,028		842,411
Bancorp, Inc.(a)(b)		77,374		1,969,168
BancorpSouth Bank		152,410		4,538,770
Bank First Corp.(b)		10,024		710,401
Bank of Marin Bancorp.		21,243		801,923
Bank of NT Butterfield & Son Ltd.		76,267		2,708,241
Banner Corp.		52,372		2,891,458
Bar Harbor Bankshares		21,850		612,892
Blue Ridge Bankshares, Inc.(b)		17,311		304,500
Bridgewater Bancshares, Inc.(a)		35,112		614,811
Bryn Mawr Bank Corp.		29,867		1,372,389
Business First Bancshares, Inc.		28,633		669,726
Byline Bancorp, Inc.		37,376		917,955
Cadence BanCorp.		182,257		4,002,364
Cambridge Bancorp.		10,129		891,352
Camden National Corp.		23,340		1,117,986
Capital Bancorp, Inc.		13,728		330,296
Capital City Bank Group, Inc.		21,636		535,275
Capitol Federal Financial, Inc.		198,169		2,276,962
Capstar Financial Holdings, Inc.		25,571		543,128

Security	Shares		Value
Banks: Diversified (continued)
Carter Bankshares, Inc.(a)		35,497	$	504,767
Cathay General Bancorp		113,031		4,678,353
CBTX, Inc.		31,455		829,783
Central Pacific Financial Corp.		36,134		927,921
Century Bancorp, Inc., Class A		4,500		518,580
CIT Group, Inc.		150,686		7,828,138
Citizens & Northern Corp.		21,059		531,950
City Holding Co.		23,672		1,844,286
Civista Bancshares, Inc.		26,232		609,369	��
CNB Financial Corp.		23,280		566,635
Coastal Financial Corp.(a)		13,132		418,386
Columbia Banking System, Inc.		111,572		4,238,620
Columbia Financial, Inc.(a)		61,595		1,139,507
Community Bank System, Inc.		80,268		5,491,937
Community Trust Bancorp, Inc.		22,638		953,060
ConnectOne Bancorp, Inc.		54,957		1,649,260
CrossFirst Bankshares, Inc.(a)		70,864		921,232
Customers Bancorp, Inc.(a)		42,576		1,831,620
CVB Financial Corp.		196,554		4,003,805
Eagle Bancorp, Inc.		47,681		2,741,657
Eastern Bankshares, Inc.		259,833		5,274,610
Enterprise Bancorp, Inc.		13,849		497,872
Enterprise Financial Services Corp.		53,555		2,424,970
Equity Bancshares, Inc., Class A		20,806		694,504
Farmers National Banc Corp.		42,743		671,493
FB Financial Corp.		53,420		2,290,650
Fidelity D&D Bancorp, Inc.		6,449		325,223
Financial Institutions, Inc.		26,478		811,551
First Bancorp, Inc.		16,608		483,957
First BanCorp, Puerto Rico		315,153		4,144,262
First Bancorp/Southern Pines NC		43,112		1,854,247
First Bancshares, Inc.		32,134		1,246,157
First Bank/Hamilton		24,595		346,544
First Busey Corp.		77,953		1,919,982
First Commonwealth Financial Corp.		139,403		1,900,063
First Community Bancshares, Inc.		25,204		799,471
First Financial Bancorp		143,414		3,357,322
First Financial Bankshares, Inc.		196,220		9,016,309
First Financial Corp.		20,784		873,967
First Foundation, Inc.		57,517		1,512,697
First Internet Bancorp		14,564		454,106
First Interstate Bancsystem, Inc., Class A		61,426		2,473,011
First Merchants Corp.		83,191		3,480,711
First Mid Bancshares, Inc.		23,111		948,938
First Midwest Bancorp, Inc.		171,475		3,259,740
First of Long Island Corp.		40,270		829,562
Five Star Bancorp		8,460		202,532
Flagstar Bancorp, Inc.		78,762		3,999,534
FS Bancorp, Inc.		12,270		424,665
Fulton Financial Corp.		239,355		3,657,344
German American Bancorp, Inc.		38,518		1,487,950
Glacier Bancorp, Inc.		145,011		8,026,359
Great Western Bancorp, Inc.		80,841		2,646,734
Guaranty Bancshares, Inc.		11,719		420,126
Hancock Whitney Corp.		131,239		6,183,982
Hanmi Financial Corp.		35,695		716,042
HarborOne Bancorp, Inc.		79,912		1,121,964
HBT Financial, Inc.		16,051		249,593
Heartland Financial USA, Inc.		63,844		3,069,620
Heritage Commerce Corp.		96,249		1,119,376
Home BancShares, Inc.		231,514		5,447,524

2

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Banks: Diversified (continued)
Hope Bancorp, Inc.		164,675	$	2,377,907
Horizon Bancorp, Inc.		66,840		1,214,483
Howard Bancorp, Inc.(a)		20,178		409,210
Independent Bank Corp.		78,018		4,338,256
Independent Bank Group, Inc.		57,278		4,069,029
International Bancshares Corp.		81,607		3,398,115
Lakeland Bancorp, Inc.		75,630		1,333,357
Lakeland Financial Corp.		36,651		2,611,017
Live Oak Bancshares, Inc.		47,413		3,016,889
Luther Burbank Corp.		30,326		406,672
Macatawa Bank Corp.		45,179		362,787
Mercantile Bank Corp.		22,520		721,316
Merchants Bancorp		13,452		530,950
Metrocity Bankshares, Inc.		28,203		591,417
Metropolitan Bank Holding Corp.(a)		12,018		1,013,117
Mid Penn Bancorp, Inc.		11,675		321,646
Midland States Bancorp, Inc.		32,587		805,877
MVB Financial Corp.		14,651		627,502
National Bank Holdings Corp., Class A		42,117		1,704,896
NBT Bancorp, Inc.		65,310		2,358,997
Nicolet Bankshares, Inc.(a)(b)		15,339		1,137,847
Northrim BanCorp, Inc.		9,948		422,889
OFG Bancorp		75,065		1,893,139
Old National Bancorp		241,751		4,097,679
Old Second Bancorp, Inc.		47,962		626,384
Origin Bancorp, Inc.		33,731		1,428,508
Orrstown Financial Services, Inc.		17,730		414,882
Pacific Premier Bancorp, Inc.		121,865		5,050,086
Park National Corp.		21,882		2,668,510
PCSB Financial Corp.		24,272		447,576
Peapack Gladstone Financial Corp.		30,765		1,026,320
Peoples Bancorp, Inc.		39,600		1,251,756
Peoples Financial Services Corp.		10,739		489,376
Pioneer Bancorp, Inc.(a)		20,117		254,279
Preferred Bank/Los Angeles CA		18,147		1,210,042
Primis Financial Corp.		32,511		470,109
Provident Financial Services, Inc.		116,700		2,738,949
QCR Holdings, Inc.		24,093		1,239,344
RBB Bancorp		26,421		666,073
Red River Bancshares, Inc.		7,783		387,983
Reliant Bancorp, Inc.		23,597		745,429
Renasant Corp.		83,410		3,006,930
Republic Bancorp, Inc., Class A		15,627		791,508
Republic First Bancorp, Inc.(a)(b)		77,302		238,090
S&T Bancorp, Inc.		55,903		1,647,461
Sandy Spring Bancorp, Inc.		72,105		3,303,851
Seacoast Banking Corp. of Florida		76,349		2,581,360
ServisFirst Bancshares, Inc.		75,656		5,886,037
Sierra Bancorp		23,052		559,703
Silvergate Capital Corp., Class A(a)		36,869		4,258,369
Simmons First National Corp., Class A		164,754		4,870,128
SmartFinancial, Inc.		21,356		552,053
South Plains Financial, Inc.		17,062		415,972
South State Corp.		105,792		7,899,489
Southern First Bancshares, Inc.(a)		11,833		633,065
Southside Bancshares, Inc.		48,411		1,853,657
Spirit of Texas Bancshares, Inc.		21,126		511,249
Stock Yards Bancorp, Inc.		34,594		2,028,938
Summit Financial Group, Inc.		19,115		468,509
Texas Capital Bancshares, Inc.(a)		77,047		4,624,361

Security	Shares		Value
Banks: Diversified (continued)
Tompkins Financial Corp.		22,163	$	1,793,208
TowneBank		103,982		3,234,880
Trico Bancshares		40,262		1,747,371
TriState Capital Holdings, Inc.(a)		42,768		904,543
Triumph Bancorp, Inc.(a)		34,915		3,496,039
TrustCo Bank Corp.		30,655		980,040
Trustmark Corp.		95,350		3,072,177
UMB Financial Corp.		66,105		6,393,015
United Bankshares, Inc.		191,677		6,973,209
United Community Banks, Inc.		118,261		3,881,326
Univest Financial Corp.		45,724		1,252,380
Valley National Bancorp		614,054		8,173,059
Veritex Holdings, Inc.		71,024		2,795,505
Washington Trust Bancorp, Inc.		26,664		1,412,659
WesBanco, Inc.		94,378		3,216,402
West BanCorp., Inc.		26,795		804,654
Westamerica BanCorp		40,498		2,278,417
				344,874,172
Banks: Savings, Thrift & Mortgage Lending — 1.1%
Amalgamated Financial Corp.		20,899		330,622
Axos Financial, Inc.(a)		88,144		4,542,942
Banc of California, Inc.		66,911		1,237,184
BankUnited, Inc.		139,380		5,828,872
Berkshire Hills Bancorp, Inc.		65,241		1,760,202
Brookline Bancorp, Inc.		112,560		1,717,666
Finance Of America Cos., Inc., Class A(a)		44,228		218,929
Flushing Financial Corp.		44,444		1,004,434
Great Southern Bancorp, Inc.		14,826		812,613
Heritage Financial Corp.		54,675		1,394,213
Hingham Institution for Savings		2,201		741,077
Home Bancorp, Inc.		12,224		472,824
Home Point Capital, Inc.(b)		7,506		30,925
HomeStreet, Inc.		27,959		1,150,513
Investors Bancorp, Inc.		350,649		5,298,306
Kearny Financial Corp.		113,470		1,410,432
Ladder Capital Corp.		180,104		1,990,149
Meridian Bancorp, Inc.		72,294		1,500,824
Northfield Bancorp, Inc.		74,887		1,285,061
Northwest Bancshares, Inc.		184,801		2,454,157
OceanFirst Financial Corp.		89,605		1,918,443
Premier Financial Corp.		55,468		1,766,101
Provident Bancorp, Inc.		32,679		523,518
Southern Missouri Bancorp, Inc.		12,070		541,822
Washington Federal, Inc.		101,456		3,480,955
Waterstone Financial, Inc.		33,179		679,838
WSFS Financial Corp.		72,072		3,698,014
				47,790,636
Beverage: Soft Drinks — 0.4%
Celsius Holdings, Inc.(a)(b)		81,847		7,373,596
Coca-Cola Consolidated, Inc.		7,185		2,832,183
Duckhorn Portfolio, Inc.(a)(b)		29,354		671,913
National Beverage Corp.		35,891		1,883,919
NewAge, Inc.(a)(b)		243,878		338,991
Primo Water Corp.		237,620		3,735,386
Zevia PBC, Class A(a)		14,065		161,888
				16,997,876
Biotechnology — 9.3%
4D Molecular Therapeutics, Inc.(a)(b)		31,966		862,123
89bio, Inc.(a)		12,295		240,859

SERIES SCHEDULE OF INVESTMENTS 3

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Biotechnology (continued)
9 Meters Biopharma, Inc.(a)(b)		312,482	$	406,227
Acumen Pharmaceuticals, Inc.(a)		14,760		219,334
Adagio Therapeutics, Inc.(a)		32,171		1,358,903
Adicet Bio, Inc.(a)		29,573		231,852
Aduro Biotech, Inc.(c)		21,953		65,859
Adverum Biotechnologies, Inc.(a)		136,226		295,610
Aeglea BioTherapeutics, Inc.(a)		71,346		567,201
Aerovate Therapeutics, Inc.(a)		11,232		235,647
Affimed NV(a)		178,550		1,103,439
Agenus, Inc.(a)		299,297		1,571,309
Agios Pharmaceuticals, Inc.(a)(b)		90,638		4,182,944
Akebia Therapeutics, Inc.(a)		277,261		798,512
Akero Therapeutics, Inc.(a)		38,642		863,649
Akouos, Inc.(a)		36,026		418,262
Albireo Pharma, Inc.(a)(b)		25,915		808,548
Aldeyra Therapeutics, Inc.(a)		73,079		641,634
Alector, Inc.(a)(b)		87,256		1,991,182
Aligos Therapeutics, Inc.(a)		27,566		427,549
Allakos, Inc.(a)(b)		52,712		5,580,619
Allogene Therapeutics, Inc.(a)		103,112		2,649,978
Allovir, Inc.(a)		44,294		1,110,008
Alpine Immune Sciences, Inc.(a)(b)		25,129		268,126
Altimmune, Inc.(a)		61,429		694,762
ALX Oncology Holdings, Inc.(a)(b)		26,983		1,992,964
Amicus Therapeutics, Inc.(a)		409,444		3,910,190
AnaptysBio, Inc.(a)(b)		32,273		875,244
Anavex Life Sciences Corp.(a)(b)		98,098		1,760,859
ANI Pharmaceuticals, Inc.(a)		15,228		499,783
Annexon, Inc.(a)		46,724		869,534
Apellis Pharmaceuticals, Inc.(a)(b)		99,146		3,267,852
Applied Molecular Transport, Inc.(a)		37,144		960,915
Applied Therapeutics, Inc.(a)		33,159		550,439
Arbutus Biopharma Corp.(a)		118,224		507,181
Arcturus Therapeutics Holdings, Inc.(a)(b)		30,796		1,471,433
Arcus Biosciences, Inc.(a)(b)		67,717		2,361,292
Arcutis Biotherapeutics, Inc.(a)(b)		43,527		1,039,860
Ardelyx, Inc.(a)(b)		116,959		154,386
Arena Pharmaceuticals, Inc.(a)		94,219		5,610,741
Arvinas, Inc.(a)		66,608		5,473,845
Atara Biotherapeutics, Inc.(a)		133,582		2,391,118
Athenex, Inc.(a)		159,533		480,194
Athersys, Inc.(a)(b)		255,927		340,383
Atossa Therapeutics, Inc.(a)		177,719		579,364
Atreca, Inc., Class A(a)(b)		45,165		281,378
Avid Bioservices, Inc.(a)(b)		91,969		1,983,771
Avidity Biosciences, Inc.(a)		57,734		1,421,988
Avita Medical, Inc.(a)		35,610		631,009
Avrobio, Inc.(a)		52,376		292,258
Beam Therapeutics, Inc.(a)(b)		75,903		6,604,320
Beyondspring, Inc.(a)(b)		35,019		551,899
BioAtla, Inc.(a)		23,389		688,572
BioCryst Pharmaceuticals, Inc.(a)		269,984		3,879,670
BioDelivery Sciences International, Inc.(a)		139,121		502,227
Biohaven Pharmaceutical Holding Co. Ltd.(a)		84,834		11,784,291
Biomea Fusion, Inc.(a)		12,712		152,163
Bioventus, Inc., Class A(a)		23,631		334,615
Bioxcel Therapeutics, Inc.(a)		25,925		786,824
Black Diamond Therapeutics, Inc.(a)		46,156		390,480
Bluebird Bio, Inc.(a)(b)		102,103		1,951,188
Blueprint Medicines Corp.(a)		89,284		9,179,288
Bolt Biotherapeutics, Inc.(a)		35,008		442,851

Security	Shares		Value
Biotechnology (continued)
Bridgebio Pharma, Inc.(a)(b)		163,072	$	7,643,185
Brooklyn ImmunoTherapeutics, Inc.(a)		44,700		415,710
C4 Therapeutics, Inc.(a)		59,298		2,649,435
Cardiff Oncology, Inc.(a)		53,346		355,284
Caribou Biosciences, Inc.(a)		29,300		699,391
Castle Biosciences, Inc.(a)		33,145		2,204,142
Catalyst Pharmaceuticals, Inc.(a)		150,582		798,085
Celcuity, Inc.(a)		10,906		196,308
Celldex Therapeutics, Inc.(a)		69,289		3,740,913
CEL-SCI Corp.(a)		55,169		606,307
Century Therapeutics, Inc.(a)		14,217		357,700
Cerevel Therapeutics Holdings, Inc.(a)		60,081		1,772,389
ChemoCentryx, Inc.(a)		81,906		1,400,593
Chinook Therapeutics, Inc.(a)		47,027		600,065
Clene, Inc.(a)(b)		31,295		213,745
Clovis Oncology, Inc.(a)(b)		166,183		741,176
Codexis, Inc.(a)(b)		91,580		2,130,151
Codiak Biosciences, Inc.(a)		22,710		370,854
Cogent Biosciences, Inc.(a)		54,386		457,386
Coherus Biosciences, Inc.(a)(b)		101,091		1,624,532
Collegium Pharmaceutical, Inc.(a)		52,060		1,027,664
Contra GTX, Inc.(b)(c)		944		968
Cortexyme, Inc.(a)(b)		30,019		2,751,542
Crinetics Pharmaceuticals, Inc.(a)(b)		54,838		1,154,340
Cue Biopharma, Inc.(a)		46,824		682,226
Cullinan Oncology, Inc.(a)(b)		39,446		890,296
Curis, Inc.(a)		130,842		1,024,493
Cymabay Therapeutics, Inc.(a)		104,476		381,337
Cytokinetics, Inc.(a)		120,541		4,308,135
CytomX Therapeutics, Inc.(a)		91,799		467,257
CytoSorbents Corp.(a)		64,033		519,948
Day One Biopharmaceuticals, Inc.(a)(b)		11,391		270,308
Deciphera Pharmaceuticals, Inc.(a)		62,795		2,133,774
Denali Therapeutics, Inc.(a)		137,342		6,928,904
Design Therapeutics, Inc.(a)(b)		19,579		287,616
Dynavax Technologies Corp.(a)(b)		162,476		3,121,164
Dyne Therapeutics, Inc.(a)		44,808		727,682
Editas Medicine, Inc.(a)		105,523		4,334,885
Eiger Biopharmaceuticals, Inc.(a)		48,670		325,116
Eliem Therapeutics, Inc.(a)		10,890		195,802
Emergent BioSolutions, Inc.(a)		74,869		3,748,691
Epizyme, Inc.(a)		137,866		705,874
Erasca, Inc.(a)		30,012		636,855
Evelo Biosciences, Inc.(a)(b)		47,428		333,893
EyePoint Pharmaceuticals, Inc.(a)(b)		29,501		307,400
Fate Therapeutics, Inc.(a)		123,804		7,337,863
FibroGen, Inc.(a)		133,924		1,368,703
Finch Therapeutics Group, Inc.(a)(b)		13,935		181,155
Foghorn Therapeutics, Inc.(a)		32,469		452,293
Forma Therapeutics Holdings, Inc.(a)		52,861		1,225,847
Forte Biosciences, Inc.(a)(b)		16,626		49,213
Fortress Biotech, Inc.(a)		95,910		308,830
Frequency Therapeutics, Inc.(a)(b)		60,914		430,053
Fulcrum Therapeutics, Inc.(a)		41,003		1,156,695
G1 Therapeutics, Inc.(a)		62,743		842,011
Gemini Therapeutics, Inc.(a)(b)		30,941		125,002
Generation Bio Co.(a)(b)		64,728		1,622,731
Geron Corp.(a)(b)		436,582		598,117
Global Blood Therapeutics, Inc.(a)		90,425		2,304,029
Gossamer Bio, Inc.(a)(b)		87,352		1,098,015
Graphite Bio, Inc.(a)(b)		24,627		403,637

4

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Biotechnology (continued)
Greenwich Lifesciences, Inc.(a)		5,921	$	231,333
Gritstone bio, Inc.(a)		58,919		636,325
GT Biopharma, Inc.(a)		34,934		235,455
Halozyme Therapeutics, Inc.(a)		214,032		8,706,822
Harpoon Therapeutics, Inc.(a)		35,617		281,374
Harvard Bioscience, Inc.(a)		61,301		427,881
Heron Therapeutics, Inc.(a)		151,411		1,618,584
Homology Medicines, Inc.(a)		66,601		524,150
Hookipa Pharma, Inc.(a)		22,901		134,887
Humanigen, Inc.(a)(b)		67,653		401,182
iBio, Inc.(a)		316,447		335,434
Icosavax, Inc.(a)(b)		19,539		578,159
Ideaya Biosciences, Inc.(a)		50,300		1,282,147
IGM Biosciences, Inc.(a)		11,313		743,943
Imago Biosciences, Inc.(a)		14,561		291,657
Immuneering Corp., Class A(a)		12,353		327,972
Immunic, Inc.(a)		28,435		251,650
ImmunityBio, Inc.(a)(b)		101,128		984,987
ImmunoGen, Inc.(a)		289,327		1,640,484
Immunovant, Inc.(a)		58,435		507,800
Impel Neuropharma, Inc.(a)(b)		10,369		126,294
Inhibrx, Inc.(a)		41,060		1,367,709
Inovio Pharmaceuticals, Inc.(a)(b)		314,243		2,249,980
Inozyme Pharma, Inc.(a)		17,048		197,586
Insmed, Inc.(a)(b)		176,818		4,869,568
Instil Bio, Inc.(a)(b)		25,525		456,259
Intellia Therapeutics, Inc.(a)(b)		104,410		14,006,601
Intercept Pharmaceuticals, Inc.(a)(b)		39,764		590,495
Invitae Corp.(a)		305,417		8,683,005
iTeos Therapeutics, Inc.(a)		29,142		786,834
IVERIC bio, Inc.(a)		157,279		2,554,211
Janux Therapeutics, Inc.(a)(b)		16,565		358,301
Jounce Therapeutics, Inc.(a)		59,732		443,809
Kadmon Holdings, Inc.(a)		269,915		2,350,960
Kala Pharmaceuticals, Inc.(a)(b)		61,146		160,203
Kaleido Biosciences, Inc.(a)(b)		19,163		104,630
KalVista Pharmaceuticals, Inc.(a)		28,539		498,006
Karuna Therapeutics, Inc.(a)		33,928		4,150,412
Karyopharm Therapeutics, Inc.(a)(b)		109,244		635,800
KemPharm, Inc.(a)		42,902		400,276
Keros Therapeutics, Inc.(a)		23,575		932,627
Kezar Life Sciences, Inc.(a)		45,133		389,949
Kiniksa Pharmaceuticals Ltd., Class A(a)		41,111		468,254
Kinnate Biopharma, Inc.(a)		35,543		818,200
Kodiak Sciences, Inc.(a)		51,580		4,950,648
Kronos Bio, Inc.(a)(b)		58,058		1,216,896
Krystal Biotech, Inc.(a)(b)		28,585		1,492,423
Kura Oncology, Inc.(a)		97,596		1,827,973
Kymera Therapeutics, Inc.(a)		51,776		3,041,322
Lexicon Pharmaceuticals, Inc.(a)		102,558		493,304
Ligand Pharmaceuticals, Inc.(a)		22,510		3,136,093
Lineage Cell Therapeutics, Inc.(a)(b)		177,498		447,295
Lyell Immunopharma, Inc.(a)		35,757		529,204
MacroGenics, Inc.(a)		93,307		1,953,849
Madrigal Pharmaceuticals, Inc.(a)		17,177		1,370,553
Magenta Therapeutics, Inc.(a)		54,237		394,845
MannKind Corp.(a)(b)		396,730		1,725,776
Marinus Pharmaceuticals, Inc.(a)(b)		55,784		634,822
MaxCyte, Inc.(a)		23,777		290,317
MeiraGTx Holdings plc(a)		49,617		653,952
Mersana Therapeutics, Inc.(a)		104,963		989,801

Security	Shares		Value
Biotechnology (continued)
MiMedx Group, Inc.(a)		165,237	$	1,001,336
Mirum Pharmaceuticals, Inc.(a)		8,546		170,236
Molecular Templates, Inc.(a)		68,237		457,870
Monte Rosa Therapeutics, Inc.(a)(b)		17,497		389,833
Morphic Holding, Inc.(a)		32,042		1,814,859
Mustang Bio, Inc.(a)		80,525		216,612
Myriad Genetics, Inc.(a)		118,117		3,813,998
Neoleukin Therapeutics, Inc.(a)		49,979		361,348
NexImmune, Inc.(a)		8,158		123,512
NGM Biopharmaceuticals, Inc.(a)		49,964		1,050,243
Nkarta, Inc.(a)		22,072		613,822
Nurix Therapeutics, Inc.(a)		49,846		1,493,386
Nuvalent, Inc.(a)		16,230		365,987
Ocugen, Inc.(a)(b)		278,977		2,003,055
Olema Pharmaceuticals, Inc.(a)(b)		38,665		1,065,607
Omega Therapeutics, Inc.(a)		9,752		183,825
Omeros Corp.(a)(b)		90,803		1,252,173
Oncocyte Corp.(a)		110,088		391,913
Oncorus, Inc.(a)		30,013		280,321
Oncternal Therapeutics, Inc.(a)		65,934		274,945
OPKO Health, Inc.(a)(b)		605,169		2,208,867
ORIC Pharmaceuticals, Inc.(a)		46,465		971,583
Outlook Therapeutics, Inc.(a)		125,636		272,630
Oyster Point Pharma, Inc.(a)		21,266		252,002
Pacific Biosciences of California, Inc.(a)		294,652		7,528,359
Passage Bio, Inc.(a)		59,966		597,261
Personalis, Inc.(a)		54,190		1,042,616
Phathom Pharmaceuticals, Inc.(a)		30,061		964,958
PMV Pharmaceuticals, Inc.(a)		39,497		1,177,011
Portage Biotech, Inc.(a)		6,706		136,266
Poseida Therapeutics, Inc.(a)(b)		48,124		350,824
Praxis Precision Medicines, Inc.(a)(b)		49,737		919,637
Precigen, Inc.(a)		144,839		722,747
Precision BioSciences, Inc.(a)(b)		71,991		830,776
Prelude Therapeutics, Inc.(a)(b)		14,971		467,844
Prometheus Biosciences, Inc.(a)(b)		16,327		387,113
Protagonist Therapeutics, Inc.(a)		67,405		1,194,417
Prothena Corp. PLC(a)		54,507		3,882,534
Provention Bio, Inc.(a)		80,450		514,880
PTC Therapeutics, Inc.(a)		109,090		4,059,239
Pulse Biosciences, Inc.(a)		21,148		456,797
Puma Biotechnology, Inc.(a)		47,281		331,440
RadNet, Inc.(a)		66,801		1,957,937
Rapt Therapeutics, Inc.(a)		32,957		1,023,315
Recursion Pharmaceuticals, Inc., Class A(a)(b)		43,331		997,046
REGENXBIO, Inc.(a)		59,760		2,505,139
Relay Therapeutics, Inc.(a)		90,454		2,852,015
Relmada Therapeutics, Inc.(a)		22,508		589,935
Replimune Group, Inc.(a)		43,290		1,283,116
Revolution Medicines, Inc.(a)		89,866		2,472,214
Rhythm Pharmaceuticals, Inc.(a)(b)		67,808		885,572
Rigel Pharmaceuticals, Inc.(a)		256,348		930,543
Rocket Pharmaceuticals, Inc.(a)(b)		60,566		1,810,318
Rubius Therapeutics, Inc.(a)		68,336		1,221,848
Sana Biotechnology, Inc.(a)(b)		131,093		2,952,214
Sangamo Therapeutics, Inc.(a)(b)		177,351		1,597,933
Scholar Rock Holding Corp.(a)		42,334		1,397,869
Selecta Biosciences, Inc.(a)		154,589		643,090
Sensei Biotherapeutics, Inc.(a)(b)		10,002		105,221
Seres Therapeutics, Inc.(a)(b)		105,148		731,830
Sesen Bio, Inc.(a)(b)		256,560		203,503

SERIES SCHEDULE OF INVESTMENTS 5

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Biotechnology (continued)
Shattuck Labs, Inc.(a)		39,554	$	806,111
Sigilon Therapeutics, Inc.(a)(b)		10,362		58,545
Silverback Therapeutics, Inc.(a)(b)		32,599		325,338
Singular Genomics Systems, Inc.(a)		15,014		168,007
Solid Biosciences, Inc.(a)		103,306		246,901
Sorrento Therapeutics, Inc.(a)(b)		425,448		3,246,168
Spero Therapeutics, Inc.(a)(b)		32,911		605,892
SpringWorks Therapeutics, Inc.(a)		43,997		2,791,170
Spruce Biosciences, Inc.(a)(b)		9,625		57,846
SQZ Biotechnologies Co.(a)(b)		33,371		481,210
Stoke Therapeutics, Inc.(a)		28,614		727,940
Summit Therapeutics, Inc.(a)		34,667		173,682
Surface Oncology, Inc.(a)		50,001		378,508
Sutro Biopharma, Inc.(a)		65,442		1,236,199
Syros Pharmaceuticals, Inc.(a)		112,522		502,973
Talaris Therapeutics, Inc.(a)		14,720		199,603
Taysha Gene Therapies, Inc.(a)(b)		32,800		610,736
TCR2 Therapeutics, Inc.(a)		43,536		370,491
Tenaya Therapeutics, Inc.(a)		19,279		398,111
Travere Therapeutics, Inc.(a)		90,084		2,184,537
Trevena, Inc.(a)		237,659		292,321
Trillium Therapeutics, Inc.(a)		147,028		2,581,812
Turning Point Therapeutics, Inc.(a)		69,469		4,614,826
Twist Bioscience Corp.(a)		72,639		7,770,194
UroGen Pharma Ltd.(a)(b)		29,912		503,120
Vanda Pharmaceuticals, Inc.(a)		80,750		1,384,055
Vaxart, Inc.(a)		180,304		1,433,417
Vaxcyte, Inc.(a)		59,852		1,518,445
VBI Vaccines, Inc.(a)		276,911		861,193
Veracyte, Inc.(a)		104,018		4,831,636
Verastem, Inc.(a)		257,792		793,999
Vericel Corp.(a)		69,739		3,403,263
Verrica Pharmaceuticals, Inc.(a)(b)		21,272		265,900
Verve Therapeutics, Inc.(a)		24,058		1,130,726
Viking Therapeutics, Inc.(a)		101,263		635,932
Vincerx Pharma, Inc.(a)		17,365		280,792
Vir Biotechnology, Inc.(a)		91,938		4,001,142
Viracta Therapeutics, Inc.(a)		53,640		430,193
VistaGen Therapeutics, Inc.(a)		281,092		770,192
Vor BioPharma, Inc.(a)		29,060		455,661
Werewolf Therapeutics, Inc.(a)		15,232		261,381
XBiotech, Inc.		21,897		283,566
Xencor, Inc.(a)		89,184		2,912,749
XOMA Corp.(a)		9,810		242,798
Y-mAbs Therapeutics, Inc.(a)		53,449		1,525,434
Zentalis Pharmaceuticals, Inc.(a)		54,094		3,604,824
ZIOPHARM Oncology, Inc.(a)(b)		326,456		594,150
				418,898,517
Building Materials — 0.7%
Aspen Aerogels, Inc.(a)(b)		31,735		1,460,127
BlueLinx Holdings, Inc.(a)(b)		13,410		655,481
Caesarstone Ltd.		34,219		425,000
Cornerstone Building Brands, Inc.(a)		83,579		1,221,089
Gibraltar Industries, Inc.(a)		49,249		3,430,193
Griffon Corp.		69,919		1,720,007
Masonite International Corp.(a)		36,910		3,917,258
Patrick Industries, Inc.		34,215		2,850,109
PGT Innovations, Inc.(a)		87,158		1,664,718

Security	Shares		Value
Building Materials (continued)
Quanex Building Products Corp.		55,582	$	1,190,011
Simpson Manufacturing Co., Inc.		66,001		7,060,127
Summit Materials, Inc., Class A(a)(b)		180,947		5,784,876
				31,378,996
Building: Climate Control — 0.2%
AAON, Inc.		64,833		4,236,188
Comfort Systems USA, Inc.		54,665		3,898,708
View, Inc.(a)(b)		155,523		842,935
				8,977,831
Building: Roofing, Wallboard & Plumbing(a) — 0.2%
Beacon Roofing Supply, Inc.		84,180		4,020,437
Forterra, Inc.		43,495		1,024,742
JELD-WEN Holding, Inc.		128,531		3,217,131
				8,262,310
Cable Television Services(a) — 0.2%
AMC Networks, Inc., Class A(b)		43,254		2,015,204
Liberty Latin America Ltd., Class A		87,902		1,149,758
Liberty Latin America Ltd., Class C		212,722		2,790,913
WideOpenWest, Inc.		80,336		1,578,602
				7,534,477
Casinos & Gambling(a) — 0.5%
Accel Entertainment, Inc.		92,576		1,123,873
Century Casinos, Inc.		41,366		557,200
Full House Resorts, Inc.(b)		47,443		503,370
Golden Nugget Online Gaming, Inc.		61,035		1,060,178
International Game Technology PLC		153,061		4,028,565
Monarch Casino & Resort, Inc.		19,195		1,285,873
Scientific Games Corp., Class A		149,014		12,378,593
				20,937,652
Cement — 0.0%
Concrete Pumping Holdings, Inc.(a)		40,542		346,229
Chemicals: Diversified — 0.7%
AdvanSix, Inc.(a)		40,566		1,612,498
American Vanguard Corp.		45,118		679,026
Avient Corp.		137,476		6,372,013
Cabot Corp.		84,344		4,227,321
CSW Industrials, Inc.		22,312		2,849,242
Danimer Scientific, Inc.(a)(b)		103,837		1,696,697
Ecovyst, Inc.		78,142		911,136
GCP Applied Technologies, Inc.(a)		73,581		1,612,896
Hawkins, Inc.		29,814		1,039,912
Ingevity Corp.(a)		61,649		4,399,889
Landec Corp.(a)(b)		42,588		392,661
Marrone Bio Innovations, Inc.(a)		93,408		84,161
PureCycle Technologies, Inc.(a)(b)		49,237		653,867
Rayonier Advanced Materials, Inc.(a)		91,699		687,743
Sensient Technologies Corp.		63,806		5,811,450
Zymergen, Inc.(a)(b)		26,928		354,642
				33,385,154
Chemicals: Specialty — 0.8%
Amyris, Inc.(a)		264,800		3,635,704
Balchem Corp.		48,879		7,090,877
FutureFuel Corp.		39,115		278,890
Innospec, Inc.		38,359		3,230,595
Kraton Corp.(a)		47,918		2,186,977
Livent Corp.(a)		245,563		5,674,961

6

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Chemicals: Specialty (continued)
Orion Engineered Carbons SA(a)		92,002	$	1,677,196
Park Aerospace Corp.		31,735		434,135
Quaker Chemical Corp.		20,512		4,876,113
Stepan Co.		32,682		3,691,105
Tronox Holdings PLC, Class A		174,544		4,302,510
				37,079,063
Coal — 0.2%
Arch Resources, Inc.(a)		22,776		2,112,474
CONSOL Energy, Inc.(a)		50,564		1,315,675
Peabody Energy Corp.(a)		126,069		1,864,561
Warrior Met Coal, Inc.		76,900		1,789,463
				7,082,173
Commercial Banks — 0.1%
Dime Community Bancshares, Inc.		53,787		1,756,683
HomeTrust Bancshares, Inc.		24,560		687,189
				2,443,872
Commercial Finance & Mortgage Companies — 0.3%
Federal Agricultural Mortgage Corp., Class C		13,666		1,483,034
Meta Financial Group, Inc.		46,248		2,427,095
Ocwen Financial Corp.(a)		11,669		328,249
PennyMac Financial Services, Inc.		49,920		3,051,610
RE/MAX Holdings, Inc., Class A		28,201		878,743
Velocity Financial Inc.(a)(b)		17,616		231,827
Walker & Dunlop, Inc.		44,593		5,061,305
				13,461,863
Commercial Services & Supplies — 0.0%
National Research Corp.		19,745		832,647
Commercial Services: Rental & Leasing — 0.6%
CAI International, Inc.		24,754		1,383,996
GATX Corp.		53,002		4,746,859
GMS, Inc.(a)		64,792		2,837,890
H&E Equipment Services, Inc.		48,832		1,694,959
Herc Holdings, Inc.(a)		38,740		6,332,440
Marlin Business Services Corp.		12,216		271,562
McGrath RentCorp		36,892		2,654,379
NOW, Inc.(a)		167,068		1,278,070
Rush Enterprises, Inc., Class B		10,246		468,959
Triton International Ltd.		101,374		5,275,503
Willis Lease Finance Corp.(a)		4,940		183,719
				27,128,336
Commercial Vehicles & Parts — 0.2%
Blue Bird Corp.(a)		22,856		476,776
Commercial Vehicle Group, Inc.(a)		48,409		457,949
Cooper-Standard Holdings, Inc.(a)		25,764		564,489
Miller Industries, Inc.		17,235		586,679
Modine Manufacturing Co.(a)		71,597		811,194
Motorcar Parts of America, Inc.(a)		27,475		535,763
REV Group, Inc.		40,519		695,306
Rush Enterprises, Inc., Class A		66,079		2,984,128
Shyft Group, Inc.(b)		52,875		2,009,779
Wabash National Corp.		81,178		1,228,223
				10,350,286
Communications Technology — 0.8%
908 Devices, Inc.(a)(d)		19,792		643,636
ADTRAN, Inc.		72,278		1,355,935
Anterix, Inc.(a)		16,723		1,015,086
Avaya Holdings Corp.(a)(b)		124,977		2,473,295

Security	Shares		Value
Communications Technology (continued)
Aviat Networks, Inc.(a)		10,089	$	331,525
Bandwidth, Inc., Class A(a)(b)		34,503		3,114,931
Calix, Inc.(a)		84,857		4,194,481
Casa Systems, Inc.(a)		46,447		314,911
Comtech Telecommunications Corp.		37,606		963,090
Digi International, Inc.(a)		56,150		1,180,273
DZS, Inc.(a)		31,355		384,412
EchoStar Corp., Class A(a)		61,601		1,571,441
Extreme Networks, Inc.(a)		184,719		1,819,482
Harmonic, Inc.(a)		143,427		1,254,986
Infinera Corp.(a)(b)		273,521		2,275,695
Inseego Corp.(a)(b)		129,668		863,589
InterDigital, Inc.		47,093		3,193,847
KVH Industries, Inc.(a)		27,118		261,146
Loral Space & Communications, Inc.		19,206		826,050
Maxar Technologies, Inc.		108,705		3,078,526
NeoPhotonics Corp.(a)		75,663		659,025
NETGEAR, Inc.(a)(b)		45,468		1,450,884
Ooma, Inc.(a)		33,106		616,103
Plantronics, Inc.(a)		63,846		1,641,481
Ribbon Communications, Inc.(a)		123,523		738,667
				36,222,497
Computer Services Software & Systems — 7.9%
A10 Networks, Inc.(a)		89,959		1,212,647
ACI Worldwide, Inc.(a)		178,385		5,481,771
Alarm.com Holdings, Inc.(a)		72,237		5,648,211
Alkami Technology, Inc.(a)		10,447		257,832
Altair Engineering, Inc., Class A(a)(b)		69,686		4,804,153
American Software, Inc., Class A		45,510		1,080,862
Appfolio, Inc., Class A(a)(b)		28,190		3,394,076
Appian Corp.(a)(b)		59,705		5,523,310
Asana, Inc., Class A(a)		112,465		11,678,366
Aterian, Inc.(a)(b)		44,027		476,812
Avid Technology, Inc.(a)		54,365		1,572,236
Benefitfocus, Inc.(a)		41,692		462,781
BigCommerce Holdings, Inc., Series-1(a)		74,168		3,755,868
Blackbaud, Inc.(a)		73,639		5,180,504
Blackline, Inc.(a)(b)		81,767		9,653,412
Blucora, Inc.(a)		71,424		1,113,500
Bottomline Technologies DE, Inc.(a)		67,849		2,665,109
Box, Inc., Class A(a)		217,501		5,148,249
Brightcove, Inc.(a)		60,050		692,977
BTRS Holdings, Inc.(a)(b)		97,883		1,041,475
Cargurus, Inc.(a)		143,244		4,499,294
Cerence, Inc.(a)(b)		57,371		5,513,927
Cleanspark, Inc.(a)(b)		49,621		575,107
Cloudera, Inc.(a)		352,961		5,636,787
CommVault Systems, Inc.(a)		69,035		5,199,026
ComScore, Inc.(a)(b)		90,134		351,523
Cornerstone OnDemand, Inc.(a)		94,695		5,422,236
Covetrus, Inc.(a)		159,416		2,891,806
CSG Systems International, Inc.		48,976		2,360,643
DarioHealth Corp.(a)		19,922		271,935
Digimarc Corp.(a)(b)		17,861		615,133
Digital Turbine, Inc.(a)(b)		137,948		9,483,925
DigitalOcean Holdings, Inc.(a)		75,083		5,828,693
Domo, Inc., Class B(a)		41,395		3,495,394
E2open Parent Holdings, Inc.(a)		245,729		2,776,738
Ebix, Inc.		40,048		1,078,493
Envestnet, Inc.(a)(b)		83,050		6,663,932

SERIES SCHEDULE OF INVESTMENTS 7

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Computer Services Software & Systems (continued)
ePlus, Inc.(a)		20,414	$	2,094,681
Eventbrite, Inc., Class A(a)		120,750		2,283,382
EverQuote, Inc., Class A(a)		28,951		539,357
Evolent Health, Inc., Class A(a)(b)		120,325		3,730,075
fuboTV, Inc.(a)(b)		200,408		4,801,776
GAN Ltd.(a)(b)		60,822		904,423
Grid Dynamics Holdings, Inc.(a)		64,029		1,870,927
Groupon, Inc.(a)(b)		38,791		884,823
GTY Technology Holdings, Inc.(a)(b)		67,891		510,540
HyreCar, Inc.(a)		26,547		225,649
Ideanomics, Inc.(a)(b)		619,244		1,219,911
Inovalon Holdings, Inc., Class A(a)		113,094		4,556,557
Intelligent Systems Corp.(a)		11,424		463,929
JFrog Ltd.(a)(b)		82,508		2,764,018
Limelight Networks, Inc.(a)		179,297		426,727
LivePerson, Inc.(a)(b)		98,044		5,779,694
LiveRamp Holdings, Inc.(a)		99,387		4,694,048
Magnite, Inc.(a)(b)		197,424		5,527,872
ManTech International Corp., Class A		41,267		3,132,991
Marathon Digital Holdings, Inc.(a)(b)		144,236		4,554,973
MicroStrategy, Inc., Class A(a)(b)		11,927		6,898,577
Mimecast Ltd.(a)		92,700		5,895,720
Mitek Systems, Inc.(a)		64,044		1,184,814
Momentive Global, Inc.(a)		197,779		3,876,468
Multiplan Corp.(a)(b)		352,092		1,982,278
NetScout Systems, Inc.(a)		104,713		2,822,015
ON24, Inc.(a)		40,833		814,210
OneSpan, Inc.(a)		56,990		1,070,272
Ouster, Inc.(a)(b)		43,454		318,083
PagerDuty, Inc.(a)		123,269		5,105,802
PAR Technology Corp.(a)(b)		36,018		2,215,467
Parsons Corp.(a)(b)		37,875		1,278,660
Paya Holdings, Inc.(a)(b)		120,126		1,305,770
PDF Solutions, Inc.(a)		43,263		996,780
Perficient, Inc.(a)		49,533		5,730,968
Ping Identity Holding Corp.(a)(b)		75,650		1,858,720
Progress Software Corp.		67,570		3,323,768
PROS Holdings, Inc.(a)		61,030		2,165,344
Q2 Holdings, Inc.(a)(b)		82,431		6,606,020
QAD, Inc., Class A		18,308		1,599,936
Rackspace Technology, Inc.(a)		81,065		1,152,744
Rapid7, Inc.(a)(b)		85,090		9,616,872
Rimini Street, Inc.(a)		67,974		655,949
Riot Blockchain, Inc.(a)(b)		127,384		3,273,769
SailPoint Technologies Holding, Inc.(a)		138,325		5,931,376
Sapiens International Corp. NV		51,299		1,476,385
Schrodinger, Inc.(a)		68,985		3,772,100
SecureWorks Corp., Class A(a)		13,813		274,602
ShotSpotter, Inc.(a)		12,094		439,859
Shutterstock, Inc.		35,613		4,035,665
Simulations Plus, Inc.		22,499		888,710
Smith Micro Software, Inc.(a)		93,421		452,158
Sprout Social, Inc., Class A(a)		68,101		8,304,917
SPS Commerce, Inc.(a)		55,096		8,887,536
Sumo Logic, Inc.(a)(b)		131,952		2,127,066
TechTarget, Inc.(a)		38,426		3,167,071
Telos Corp.(a)		60,834		1,728,902
Tenable Holdings, Inc.(a)		138,548		6,392,605
Tucows, Inc., Class A(a)(b)		14,386		1,135,775

Security	Shares		Value
Computer Services Software & Systems (continued)
Unisys Corp.(a)(b)		100,338	$	2,522,497
Upland Software, Inc.(a)		45,169		1,510,451
Upwork, Inc.(a)		180,263		8,117,243
Varonis Systems, Inc.(a)		160,474		9,764,843
Verint Systems, Inc.(a)(b)		97,857		4,383,015
Veritone, Inc.(a)(b)		43,131		1,030,400
Verra Mobility Corp.(a)		203,479		3,066,429
Viant Technology, Inc., Class A(a)		18,892		230,860
VirnetX Holding Corp.(a)		96,165		376,967
Workiva, Inc.(a)		65,549		9,239,787
Yelp, Inc.(a)		108,122		4,026,463
Yext, Inc.(a)(b)		170,035		2,045,521
Zix Corp.(a)		83,627		591,243
Zuora, Inc., Class A(a)(b)		166,919		2,767,517
				354,912,065
Computer Technology — 0.6%
3D Systems Corp.(a)		183,969		5,072,025
Cantaloupe, Inc.(a)		85,825		925,194
Corsair Gaming, Inc.(a)(b)		41,270		1,070,131
Diebold Nixdorf, Inc.(a)		118,421		1,197,236
Identiv, Inc.(a)		30,066		566,444
Impinj, Inc.(a)(b)		30,549		1,745,264
Insight Enterprises, Inc.(a)		53,009		4,775,051
PC Connection, Inc.		16,720		736,182
Quantum Corp.(a)		90,596		469,287
Super Micro Computer, Inc.(a)		65,531		2,396,469
Synaptics, Inc.(a)		53,399		9,597,402
				28,550,685
Construction — 0.4%
Construction Partners, Inc., Class A(a)(b)		43,178		1,440,850
EMCOR Group, Inc.		80,650		9,305,397
Granite Construction, Inc.		71,582		2,831,068
Great Lakes Dredge & Dock Corp.(a)(b)		96,393		1,454,570
Innovate Corp.(a)(b)		77,220		316,602
Primoris Services Corp.		81,337		1,991,943
Sterling Construction Co., Inc.(a)(b)		41,720		945,793
Tutor Perini Corp.(a)		62,081		805,811
				19,092,034
Consumer Electronics(a) — 0.2%
Sonos, Inc.		182,376		5,901,687
Universal Electronics, Inc.		20,123		991,058
VOXX International Corp.		30,284		346,752
Vuzix Corp.		88,923		930,134
				8,169,631
Consumer Lending — 0.7%
Curo Group Holdings Corp.		32,093		556,172
Encore Capital Group, Inc.(a)(b)		47,709		2,350,622
Enova International, Inc.(a)		55,026		1,901,148
Ezcorp, Inc., Class A(a)		71,050		537,849
FirstCash, Inc.		60,362		5,281,675
LendingTree, Inc.(a)		17,681		2,472,334
Marcus & Millichap, Inc.(a)		35,893		1,457,974
MoneyGram International, Inc.(a)(b)		135,919		1,090,070
Navient Corp.		250,324		4,938,893
Nelnet, Inc., Class A		26,260		2,080,842
Oportun Financial Corp.(a)		30,188		755,606
PRA Group, Inc.(a)		68,675		2,893,965

8

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares	Value
Consumer Lending (continued)
PROG Holdings, Inc.	100,827	$4,235,742
Regional Management Corp.	12,891	749,998
World Acceptance Corp.(a)	6,745	1,278,717
		32,581,607
Consumer Services: Miscellaneous — 0.2%
Cars.com, Inc.(a)	103,348	1,307,352
Chuy’s Holdings, Inc.(a)	30,052	947,540
Franchise Group, Inc.	42,729	1,513,034
KAR Auction Services, Inc.(a)	179,568	2,943,119
WW International, Inc.(a)(b)	83,641	1,526,448
		8,237,493
Containers & Packaging — 0.3%
Greif, Inc., Class A	38,555	2,490,653
Greif, Inc., Class B	10,120	655,776
Myers Industries, Inc.	53,357	1,044,196
O-I Glass, Inc.(a)	239,074	3,411,586
Pactiv Evergreen, Inc.	60,715	760,152
Ranpak Holdings Corp.(a)	59,234	1,588,656
UFP Technologies, Inc.(a)(b)	11,366	700,032
Veritiv Corp.(a)(b)	22,431	2,008,920
		12,659,971
Cosmetics — 0.1%elf Beauty, Inc.(a)	73,849	2,145,314
Inter Parfums, Inc.	27,159	2,030,678
Revlon, Inc., Class A(a)	11,949	120,804
		4,296,796
Diversified Financial Services — 0.7%
Alerus Financial Corp.	21,917	654,880
Associated Capital Group, Inc., Class A	3,113	116,457
Cannae Holdings, Inc.(a)	130,054	4,045,980
European Wax Center, Inc., Class A(a)	14,569	408,078
Greenhill & Co., Inc.	22,224	324,915
Hannon Armstrong Sustainable Infrastructure Capital, Inc.	116,466	6,228,602
Houlihan Lokey, Inc.	76,969	7,088,845
MBIA, Inc.(a)(b)	76,509	983,141
MidWestOne Financial Group, Inc.	23,793	717,597
Moelis & Co., Class A	92,688	5,734,606
Piper Sandler Cos.	26,738	3,702,143
Tiptree, Inc.	37,480	375,550
		30,380,794
Diversified Manufacturing Operations — 0.5%
Barnes Group, Inc.	71,675	2,990,998
Custom Truck One Source, Inc.(a)(b)	69,317	646,727
Enerpac Tool Group Corp.	89,708	1,859,647
Federal Signal Corp.	91,305	3,526,199
Harsco Corp.(a)(b)	117,615	1,993,574
Luxfer Holdings PLC	41,578	816,176
Lydall, Inc.(a)	25,519	1,584,475
OSI Systems, Inc.(a)	26,193	2,483,096
PowerSchool Holdings, Inc., Class A(a)(b)	64,065	1,576,640
Raven Industries, Inc.(a)	54,442	3,136,404
Standex International Corp.	18,771	1,856,639
TriMas Corp.(a)	66,474	2,151,099
		24,621,674
Diversified Materials & Processing — 0.2%
Belden, Inc.(b)	66,534	3,876,271
Encore Wire Corp.	30,769	2,917,824

Security	Shares		Value
Diversified Materials & Processing (continued)
Insteel Industries, Inc.		28,902	$	1,099,721
Koppers Holdings, Inc.(a)		31,212		975,687
NL Industries, Inc.		9,941		57,260
Tredegar Corp.		40,253		490,282
Uranium Energy Corp.(a)(b)		350,571		1,069,242
				10,486,287
Diversified Media — 0.0%
EW Scripps Co., Class A		85,234		1,539,326
Hemisphere Media Group, Inc.(a)		26,455		322,222
				1,861,548
Diversified Retail — 1.0%
Big Lots, Inc.		52,816		2,290,102
BJ’s Wholesale Club Holdings, Inc.(a)		207,768		11,410,618
Dillard’s, Inc., Class A		8,853		1,527,320
Duluth Holdings, Inc., Class B(a)		17,500		238,525
Global Industrial Co.		19,080		722,941
Macy’s, Inc.		469,451		10,609,593
Overstock.com, Inc.(a)(b)		64,869		5,054,592
Porch Group, Inc.(a)		116,742		2,063,999
PriceSmart, Inc.		36,353		2,819,175
Revolve Group, Inc.(a)(b)		54,184		3,346,946
Stitch Fix, Inc., Class A(a)(b)		88,810		3,547,959
Winmark Corp.		5,762		1,239,003
				44,870,773
Drug & Grocery Store Chains — 0.2%
Ingles Markets, Inc., Class A.		21,431		1,415,089
PetMed Express, Inc.		29,675		797,367
Rite Aid Corp.(a)		82,680		1,174,056
Sprouts Farmers Market, Inc.(a)		174,045		4,032,623
Village Super Market, Inc., Class A		13,818		299,574
Weis Markets, Inc.		25,358		1,332,563
				9,051,272
Education Services — 0.6%
2U, Inc.(a)		108,204		3,632,408
Adtalem Global Education, Inc.(a)		75,850		2,867,888
American Public Education, Inc.(a)		30,013		768,633
Coursera, Inc.(a)		87,846		2,780,326
Franklin Covey Co.(a)		19,637		800,993
Graham Holdings Co., Class B		5,812		3,424,198
HealthStream, Inc.(a)		36,244		1,035,854
Houghton Mifflin Harcourt Co.(a)		192,576		2,586,296
Laureate Education, Inc., Class A(a)		152,071		2,583,686
Perdoceo Education Corp.(a)		102,132		1,078,514
Strategic Education, Inc.		36,336		2,561,688
Stride, Inc.(a)(b)		61,371		2,205,674
				26,326,158
Electronic Components — 0.8%
Acacia Research Corp.(a)		73,479		498,922
American Superconductor Corp.(a)(b)		40,149		585,372
Array Technologies, Inc.(a)(b)		193,073		3,575,712
Eos Energy Enterprises, Inc.(a)(b)		64,150		900,024
Methode Electronics, Inc.		59,022		2,481,875
MicroVision, Inc.(a)(b)		251,799		2,782,379
Novanta, Inc.(a)(b)		53,550		8,273,475
NVE Corp.		7,682		491,418
Rogers Corp.(a)		28,523		5,318,969
Sanmina Corp.(a)		97,970		3,775,764
ScanSource, Inc.(a)		38,392		1,335,658

SERIES SCHEDULE OF INVESTMENTS 9

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Electronic Components (continued)
Stem, Inc.(a)		74,511	$	1,780,068
TTM Technologies, Inc.(a)		161,307		2,027,629
Velodyne Lidar, Inc.(a)(b)		107,684		637,489
				34,464,754
Electronic Entertainment — 0.0%
PlayAGS, Inc.(a)		39,489		311,174
Turtle Beach Corp.(a)		23,215		645,841
Via Renewables, Inc.		18,805		191,623
				1,148,638
Electronics(a) — 0.5%
Agilysys, Inc.		29,082		1,522,734
Daktronics, Inc.		60,802		330,155
II-VI, Inc.(b)		159,049		9,441,149
Integer Holdings Corp.		50,207		4,485,493
iRobot Corp.		43,225		3,393,162
Iteris, Inc.(b)		65,743		347,123
nLight, Inc.(b)		64,513		1,818,621
				21,338,437
Energy Equipment — 0.6%
API Group Corp.(a)(e)		299,413		6,093,055
Arcosa, Inc.		73,666		3,695,823
Beam Global(a)(b)		13,184		360,846
Bloom Energy Corp., Class A(a)		212,474		3,977,513
FuelCell Energy, Inc.(a)(b)		497,577		3,328,790
Matador Resources Co.		168,796		6,421,000
SunPower Corp.(a)(b)		124,931		2,833,435
TPI Composites, Inc.(a)		54,901		1,852,909
				28,563,371
Engineering & Contracting Services — 1.0%
Argan, Inc.		22,506		982,837
Dycom Industries, Inc.(a)		45,401		3,234,367
Exponent, Inc.		78,789		8,914,975
Fluor Corp.(a)		211,563		3,378,661
IES Holdings, Inc.(a)		12,597		575,557
KBR, Inc.		215,246		8,480,693
Mistras Group, Inc.(a)		27,467		279,065
MYR Group, Inc.(a)		25,004		2,487,898
NETSTREIT Corp.		59,568		1,408,783
Tetra Tech, Inc.		81,852		12,223,778
VSE Corp.		14,705		708,340
Willdan Group, Inc.(a)		15,414		548,584
				43,223,538
Entertainment(a) — 0.9%
AMC Entertainment Holdings, Inc., Class A(b)		783,773		29,830,400
Chicken Soup For The Soul Entertainment, Inc.		10,364		237,025
Cinemark Holdings, Inc.		165,507		3,179,390
CuriosityStream, Inc.(b)		38,908		410,090
Golden Entertainment, Inc.		25,903		1,271,578
IMAX Corp.		75,894		1,440,468
Lions Gate Entertainment Corp., Class A(b)		109,862		1,558,942
Lions Gate Entertainment Corp., Class B		161,198		2,095,574
				40,023,467
Environmental, Maintenance, & Security Service — 0.5%
ABM Industries, Inc.		102,387		4,608,439
BrightView Holdings, Inc.(a)		60,499		892,965
Brink’s Co.		74,013		4,685,023
Healthcare Services Group, Inc.		114,242		2,854,907
IBEX Holdings Ltd.(a)		10,191		173,247

Security	Shares		Value
Environmental, Maintenance, & Security Service (continued)
Montrose Environmental Group, Inc.(a)		36,369	$	2,245,422
SP Plus Corp.(a)		34,800		1,067,316
UniFirst Corp.		22,656		4,817,119
Vivint Smart Home, Inc.(a)		139,486		1,318,143
				22,662,581
Financial Data & Systems — 0.6%
Atlanticus Holdings Corp.(a)(b)		7,396		392,432
Cass Information Systems, Inc.		22,211		929,530
Donnelley Financial Solutions, Inc.(a)		44,696		1,547,376
Everi Holdings, Inc.(a)		126,074		3,048,469
EVERTEC, Inc.		91,405		4,179,037
Evo Payments, Inc., Class A(a)		68,630		1,625,158
Green Dot Corp., Class A(a)		80,675		4,060,373
GreenBox POS(a)(b)		25,085		207,955
GreenSky, Inc., Class A(a)		111,319		1,244,546
I3 Verticals, Inc., Class A(a)(b)		28,720		695,311
International Money Express, Inc.(a)		48,440		808,948
LendingClub Corp.(a)		149,037		4,208,805
Priority Technology Holdings, Inc.(a)		9,786		65,371
Repay Holdings Corp.(a)(b)		131,837		3,036,206
Value Line, Inc.		1,578		54,062
				26,103,579
Food & Staples Retailing — 0.0%
Natural Grocers by Vitamin Cottage, Inc.		14,822		166,303
Foods — 1.2%
AppHarvest, Inc.(a)(b)		106,445		694,021
B&G Foods, Inc.		97,006		2,899,509
BellRing Brands, Inc., Class A(a)		60,091		1,847,798
Chefs’ Warehouse, Inc.(a)		48,326		1,573,978
HF Foods Group, Inc.(a)		54,160		327,668
Hostess Brands, Inc.(a)		199,564		3,466,427
J&J Snack Foods Corp.		22,736		3,474,516
John B Sanfilippo & Son, Inc.		13,010		1,063,177
Laird Superfood, Inc.(a)(b)		11,995		228,865
Lancaster Colony Corp.		28,430		4,799,268
Medifast, Inc.		17,838		3,436,312
Mission Produce, Inc.(a)		53,823		989,267
Nature’s Sunshine Products, Inc.		13,928		204,045
Performance Food Group Co.(a)		231,199		10,741,506
Seneca Foods Corp., Class A(a)		10,032		483,743
Simply Good Foods Co.(a)(b)		129,454		4,464,869
SpartanNash Co.		55,087		1,206,405
Tattooed Chef, Inc.(a)(b)		72,463		1,335,493
Tootsie Roll Industries, Inc.		24,156		735,067
TreeHouse Foods, Inc.(a)(b)		78,155		3,116,821
United Natural Foods, Inc.(a)		84,930		4,112,311
Utz Brands, Inc.		87,842		1,504,733
Vital Farms, Inc.(a)		35,380		621,627
Whole Earth Brands, Inc.(a)		54,847		633,483
				53,960,909
Forest Products — 0.2%
Boise Cascade Co.		59,930		3,235,021
UFP Industries, Inc.		90,646		6,162,115
				9,397,136
Forms & Bulk Printing Services — 0.1%
Deluxe Corp.		64,081		2,299,867

10

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Forms & Bulk Printing Services (continued)
Ennis, Inc.		39,632	$	747,063
RR Donnelley & Sons Co.(a)		104,632		537,809
				3,584,739
Fruit & Grain Processing — 0.0%
MGP Ingredients, Inc.		22,934		1,493,003
Funeral Parlors & Cemeteries — 0.2%
Carriage Services, Inc.		26,364		1,175,571
Hillenbrand, Inc.		109,803		4,683,098
Matthews International Corp., Class A		46,359		1,608,193
				7,466,862
Gas Pipeline — 0.1%
Altus Midstream Co., Class A		4,956		342,113
Equitrans Midstream Corp.		626,311		6,350,793
				6,692,906
Glass — 0.0%
Apogee Enterprises, Inc.		38,941		1,470,412
Gold(a) — 0.1%
Coeur Mining, Inc.(b)		393,167		2,425,840
Novagold Resources, Inc.		355,241		2,444,058
				4,869,898
Health Care Equipment & Supplies — 0.0%
Inogen, Inc.(a)		31,294		1,348,458
Health Care Facilities — 0.9%
Apollo Medical Holdings, Inc.(a)		57,258		5,213,341
Brookdale Senior Living, Inc.(a)		280,529		1,767,333
CVRx, Inc.(a)		11,889		196,644
Ensign Group, Inc.		80,117		5,999,962
Hanger, Inc.(a)		57,173		1,255,519
Joint Corp.(a)		20,324		1,992,158
LifeStance Health Group, Inc.(a)(b)		68,301		990,364
National HealthCare Corp.		18,914		1,323,602
Ontrak, Inc.(a)(b)		12,797		128,482
Pliant Therapeutics, Inc.(a)(b)		38,444		648,935
RxSight, Inc.(a)(b)		12,164		154,118
Select Medical Holdings Corp.		167,330		6,052,326
Sight Sciences, Inc.(a)		16,298		369,965
Tenet Healthcare Corp.(a)		161,586		10,735,774
U.S. Physical Therapy, Inc.		19,451		2,151,280
				38,979,803
Health Care Management Services — 0.4%
1Life Healthcare, Inc.(a)(b)		176,519		3,574,510
Computer Programs & Systems, Inc.		20,882		740,476
Magellan Health, Inc.(a)		36,600		3,460,530
Option Care Health, Inc.(a)		227,987		5,530,964
Progyny, Inc.(a)		96,252		5,390,112
Triple-S Management Corp.(a)		33,003		1,167,316
				19,863,908
Health Care Services — 2.4%
Accelerate Diagnostics, Inc.(a)(b)		52,110		303,801
Accolade, Inc.(a)		76,076		3,208,125
Addus HomeCare Corp.(a)		24,018		1,915,435
Agiliti, Inc.(a)		38,298		729,194
Alignment Healthcare, Inc.(a)		37,295		595,974
Allscripts Healthcare Solutions, Inc.(a)(b)		189,629		2,535,340
American Well Corp., Class A(a)(b)		281,434		2,563,864
AMN Healthcare Services, Inc.(a)		71,686		8,225,968

Security	Shares		Value
Health Care Services (continued)
Aveanna Healthcare Holdings, Inc.(a)		58,037	$	465,457
Biodesix, Inc.(a)		20,553		168,946
Butterfly Network, Inc.(a)		277,154		2,893,488
Cara Therapeutics, Inc.(a)		69,817		1,078,673
Convey Holding Parent, Inc.(a)		18,454		155,014
CorVel Corp.(a)		13,403		2,495,907
Cross Country Healthcare, Inc.(a)		55,174		1,171,896
Flexion Therapeutics, Inc.(a)(b)		66,694		406,833
Forian, Inc.(a)(b)		26,005		268,372
Health Catalyst, Inc.(a)(b)		76,492		3,825,365
HealthEquity, Inc.(a)		124,436		8,058,475
Inari Medical, Inc.(a)(b)		51,310		4,161,241
LHC Group, Inc.(a)		46,552		7,304,474
MEDNAX, Inc.(a)		114,501		3,255,263
ModivCare, Inc.(a)		18,848		3,423,174
NantHealth, Inc.(a)		45,434		73,149
NeoGenomics, Inc.(a)(b)		173,816		8,384,884
NextGen Healthcare, Inc.(a)		93,671		1,320,761
Omnicell, Inc.(a)		65,886		9,779,459
OptimizeRx Corp.(a)(b)		26,897		2,301,038
Ortho Clinical Diagnostics Holdings PLC(a)		165,985		3,067,403
Pennant Group, Inc.(a)		38,847		1,091,212
Phibro Animal Health Corp., Class A		31,916		687,471
Phreesia, Inc.(a)		74,333		4,586,346
Privia Health Group, Inc.(a)		29,290		690,072
R1 RCM, Inc.(a)		183,629		4,041,674
Ryman Hospitality Properties, Inc.(a)		82,374		6,894,704
SOC Telemed, Inc.(a)(b)		60,432		136,576
Surgery Partners, Inc.(a)(b)		48,016		2,032,997
Tabula Rasa HealthCare, Inc.(a)(b)		35,951		942,276
Talis Biomedical Corp.(a)(b)		18,330		114,562
Tivity Health, Inc.(a)(b)		66,397		1,531,115
Viemed Healthcare, Inc.(a)		53,389		296,309
				107,182,287
Health Care: Miscellaneous(a) — 0.2%
Absci Corp.		21,122		245,649
Berkeley Lights, Inc.		71,992		1,408,164
Medpace Holdings, Inc.		44,330		8,390,782
				10,044,595
Home Building — 0.9%
Beazer Homes USA, Inc.(a)		43,548		751,203
Century Communities, Inc.		44,860		2,756,647
Hovnanian Enterprises, Inc., Class A(a)		7,645		736,901
Installed Building Products, Inc.		36,592		3,920,833
KB Home		127,037		4,944,280
Legacy Housing Corp.(a)		14,089		253,179
LGI Homes, Inc.(a)		33,672		4,778,393
M/I Homes, Inc.(a)(b)		44,516		2,573,025
MDC Holdings, Inc.		85,948		4,015,491
Meritage Homes Corp.(a)		56,663		5,496,311
Taylor Morrison Home Corp.(a)		185,870		4,791,729
Tri Pointe Homes, Inc.(a)		171,730		3,609,765
				38,627,757
Hotel/Motel(a) — 0.2%
Bally’s Corp.		49,563		2,485,089
F45 Training Holdings, Inc.		29,995		448,725
Krispy Kreme, Inc.(b)		32,752		458,528
Marcus Corp.		34,260		597,837

SERIES SCHEDULE OF INVESTMENTS 11

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Hotel/Motel (continued)
NEOGAMES SA		7,862	$	288,693
Red Rock Resorts, Inc., Class A		94,501		4,840,341
Xponential Fitness, Inc., Class A		13,609		172,698
				9,291,911
Household Appliances — 0.0%
Hamilton Beach Brands Holding Co., Class A		10,779		168,907
National Presto Industries, Inc.		7,716		633,329
Snap One Holdings Corp.(a)		17,057		284,340
Traeger, Inc.(a)		32,873		688,032
				1,774,608
Household Equipment & Products — 0.7%
Central Garden & Pet Co.(a)		21,461		1,030,128
Central Garden & Pet Co., Class A(a)		54,278		2,333,954
Energizer Holdings, Inc.		102,337		3,996,260
Helen of Troy Ltd.(a)		36,625		8,228,905
LiveOne, Inc.(a)(b)		71,532		213,881
Tupperware Brands Corp.(a)		71,767		1,515,719
Weber, Inc.(a)(b)		24,323		427,841
Zurn Water Solutions Corp.		184,369		11,853,083
				29,599,771
Household Furnishings — 0.3%
American Woodmark Corp.(a)		24,508		1,602,088
Bassett Furniture Industries, Inc.		13,681		247,763
Casper Sleep, Inc.(a)		39,570		168,964
Ethan Allen Interiors, Inc.		34,222		811,061
Flexsteel Industries, Inc.		9,438		291,445
Hooker Furniture Corp.		18,337		494,916
Kirkland’s, Inc.(a)		21,128		405,869
La-Z-Boy, Inc.		67,768		2,184,163
Lifetime Brands, Inc.		19,521		355,087
Lovesac Co.(a)		19,504		1,289,019
Purple Innovation, Inc.(a)		87,727		1,844,022
Sleep Number Corp.(a)		34,773		3,250,580
				12,944,977
Insurance: Life — 0.4%
American Equity Investment Life Holding Co.		123,982		3,666,148
Bright Health Group, Inc.(a)		68,166		556,235
Citizens, Inc.(a)(b)		76,911		477,617
CNO Financial Group, Inc.		196,824		4,633,237
Independence Holding Co.		8,767		434,756
MetroMile, Inc.(a)		54,157		192,257
National Western Life Group, Inc., Class A		4,419		930,597
Selectquote, Inc.(a)(b)		203,308		2,628,772
Trean Insurance Group, Inc.(a)		31,544		326,480
Trupanion, Inc.(a)(b)		58,162		4,517,443
				18,363,542
Insurance: Multi-Line — 0.5%
American National Group, Inc.		11,181		2,113,544
BRP Group, Inc., Class A(a)		73,211		2,437,194
Crawford & Co., Class A		27,856		249,868
eHealth, Inc.(a)		39,271		1,590,475
Goosehead Insurance, Inc., Class A		26,661		4,060,204
Horace Mann Educators Corp.		66,033		2,627,453
James River Group Holdings Ltd.		48,689		1,837,036
Maiden Holdings Ltd.(a)		93,379		295,078

Security	Shares		Value
Insurance: Multi-Line (continued)
Mr Cooper Group, Inc.(a)		107,834	$	4,439,526
SiriusPoint Ltd.(a)		130,195		1,205,606
				20,855,984
Insurance: Property-Casualty — 1.5%
AMERISAFE, Inc.		28,588		1,605,502
Argo Group International Holdings Ltd.		47,416		2,476,064
Donegal Group, Inc., Class A		16,442		238,245
Employers Holdings, Inc.		44,106		1,741,746
Enstar Group Ltd.(a)		18,875		4,430,529
Essent Group Ltd.		167,854		7,387,255
Genworth Financial, Inc., Class A(a)		761,926		2,857,222
Greenlight Capital Re Ltd., Class A(a)		45,606		337,028
HCI Group, Inc.		9,261		1,025,841
Heritage Insurance Holdings, Inc.		37,672		256,546
Hilltop Holdings, Inc.		96,294		3,145,925
Investors Title Co.		2,120		387,112
Kinsale Capital Group, Inc.		33,173		5,364,074
NI Holdings, Inc.(a)		17,790		312,392
NMI Holdings, Inc., Class A(a)		125,480		2,837,103
Palomar Holdings, Inc.(a)		37,025		2,992,731
ProAssurance Corp.		79,587		1,892,579
Radian Group, Inc.		282,041		6,407,972
RLI Corp.		60,305		6,046,782
Safety Insurance Group, Inc.		21,829		1,729,948
Selective Insurance Group, Inc.		89,577		6,765,751
State Auto Financial Corp.		27,251		1,388,438
Stewart Information Services Corp.		40,510		2,562,663
United Fire Group, Inc.		30,461		703,649
United Insurance Holdings Corp.		29,849		108,352
Universal Insurance Holdings, Inc.		42,660		556,286
				65,557,735
International Trade & Diversified Logistic(a) — 0.1%
CryoPort, Inc.		61,075		4,062,098
Radiant Logistics, Inc.		64,753		413,772
Vectrus, Inc.		17,636		886,738
				5,362,608
Internet Software & Services(a) — 0.2%
1stdibs.com, Inc.(b)		10,479		129,940
ChannelAdvisor Corp.		42,543		1,073,360
eGain Corp.		34,204		348,881
Flywire Corp.(b)		17,853		782,675
Gogo, Inc.(b)		90,829		1,571,342
MediaAlpha, Inc., Class A		32,376		604,784
Outbrain, Inc.		11,684		172,923
Quotient Technology, Inc.		131,056		762,746
TrueCar, Inc.		150,084		624,349
Xometry, Inc., Class A		12,099		697,749
				6,768,749
Leisure Time — 0.8%
Acushnet Holdings Corp.		52,222		2,438,767
American Outdoor Brands, Inc.(a)		20,502		503,529
AMMO, Inc.(a)(b)		131,835		810,785
Callaway Golf Co.(a)		176,805		4,885,122
Clarus Corp.		36,343		931,471
Drive Shack, Inc.(a)		124,388		349,530
Escalade, Inc.		15,322		289,739
Genius Brands International, Inc.(a)(b)		431,518		586,864
Hilton Grand Vacations, Inc.(a)(b)		129,989		6,183,577

12

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Leisure Time (continued)
Johnson Outdoors, Inc., Class A		7,691	$	813,708
Latham Group, Inc.(a)		34,059		558,568
Liberty TripAdvisor Holdings, Inc., Class A(a)		111,831		345,558
Lindblad Expeditions Holdings, Inc.(a)		39,589		577,604
Madison Square Garden Entertainment Corp.(a)		39,820		2,893,719
Nautilus, Inc.(a)(b)		45,255		421,324
OneSpaWorld Holdings Ltd.(a)		87,454		871,916
RCI Hospitality Holdings, Inc.		12,464		853,909
SeaWorld Entertainment, Inc.(a)		78,989		4,369,672
Smith & Wesson Brands, Inc.		72,601		1,507,197
Sturm Ruger & Co., Inc.		26,031		1,920,567
Vista Outdoor, Inc.(a)(b)		88,810		3,579,931
				35,693,057
Life Sciences Tools & Services — 0.0%
WaVe Life Sciences Ltd.(a)		52,402		256,770
Luxury Items — 0.2%
Movado Group, Inc.		24,262		764,010
Signet Jewelers Ltd.		79,086		6,244,631
Stagwell, Inc.(a)(b)		89,570		687,002
				7,695,643
Machinery: Agricultural — 0.1%
Alamo Group, Inc.		14,516		2,025,418
Integral Ad Science Holding Corp.(a)		24,441		504,218
Lindsay Corp.		16,427		2,493,454
Titan International, Inc.(a)		75,991		544,096
Titan Machinery, Inc.(a)		29,884		774,294
				6,341,480
Machinery: Construction & Handling — 0.2%
Astec Industries, Inc.		33,437		1,799,245
Douglas Dynamics, Inc.		35,071		1,273,077
Manitowoc Co., Inc.(a)		51,092		1,094,391
Terex Corp.		104,029		4,379,621
				8,546,334
Machinery: Industrial — 1.6%
AgEagle Aerial Systems, Inc.(a)		100,550		302,656
Altra Industrial Motion Corp.		98,295		5,440,628
Applied Industrial Technologies, Inc.		59,370		5,351,018
Chart Industries, Inc.(a)		55,558		10,617,689
Columbus McKinnon Corp.		42,217		2,041,192
Desktop Metal, Inc., Class A(a)		229,552		1,645,888
DXP Enterprises, Inc.(a)		25,709		760,215
EnPro Industries, Inc.		31,587		2,751,860
EVI Industries, Inc.(a)		7,342		199,702
ExOne Co.(a)		24,529		573,488
Hydrofarm Holdings Group, Inc.(a)(b)		58,984		2,232,545
Hyliion Holdings Corp.(a)(b)		177,447		1,490,555
Hyster-Yale Materials Handling, Inc.		14,893		748,522
John Bean Technologies Corp.		47,773		6,714,495
Kadant, Inc.		17,523		3,576,444
Kennametal, Inc.		127,271		4,356,486
Mayville Engineering Co., Inc.(a)		9,414		176,983
Nikola Corp.(a)(b)		342,531		3,654,806
Omega Flex, Inc.		4,242		605,291
Proto Labs, Inc.(a)(b)		41,980		2,795,868
SPX Corp.(a)		67,529		3,609,425
SPX FLOW, Inc.		63,239		4,622,771

Security	Shares		Value
Machinery: Industrial (continued)
Tennant Co.		26,822	$	1,983,487
Welbilt, Inc.(a)		198,995		4,624,644
				70,876,658
Machinery: Specialty — 0.1%
Albany International Corp., Class A		46,518		3,575,839
Manufactured Housing(a) — 0.2%
Cavco Industries, Inc.		14,005		3,315,543
Skyline Champion Corp.		80,062		4,808,524
				8,124,067
Medical & Dental Instruments & Supplies — 2.2%
Akoya Biosciences, Inc.(a)		12,187		170,131
Alphatec Holdings, Inc.(a)(b)		109,346		1,332,928
AngioDynamics, Inc.(a)		54,478		1,413,159
Anika Therapeutics, Inc.(a)		21,406		911,039
Antares Pharma, Inc.(a)(b)		243,433		886,096
Apyx Medical Corp.(a)		50,717		702,431
Asensus Surgical, Inc.(a)(b)		353,864		654,648
AtriCure, Inc.(a)		69,310		4,820,511
Atrion Corp.		2,173		1,515,668
Avanos Medical, Inc.(a)		72,524		2,262,749
Axogen, Inc.(a)		55,140		871,212
BioLife Solutions, Inc.(a)		36,395		1,540,236
Cardiovascular Systems, Inc.(a)		60,505		1,986,379
Cerus Corp.(a)		250,220		1,523,840
Community Health Systems, Inc.(a)		187,732		2,196,464
CONMED Corp.		44,073		5,766,071
CryoLife, Inc.(a)		58,286		1,299,195
Cutera, Inc.(a)		26,637		1,241,284
Eargo, Inc.(a)		29,019		195,298
Exagen, Inc.(a)		20,018		272,245
InfuSystem Holdings, Inc.(a)		23,537		306,687
Intersect ENT, Inc.(a)		49,911		1,357,579
Invacare Corp.(a)		50,360		239,714
LeMaitre Vascular, Inc.		29,168		1,548,529
LivaNova PLC(a)		81,412		6,447,016
Meridian Bioscience, Inc.(a)		63,560		1,222,894
Merit Medical Systems, Inc.(a)		78,484		5,635,151
NanoString Technologies, Inc.(a)		69,960		3,358,780
Neogen Corp.(a)		164,330		7,136,852
NuVasive, Inc.(a)(b)		78,900		4,722,165
Ocular Therapeutix, Inc.(a)		116,515		1,165,150
OraSure Technologies, Inc.(a)(b)		106,969		1,209,819
Organogenesis Holdings, Inc.(a)		57,622		820,537
Orthofix Medical, Inc.(a)		27,983		1,066,712
OrthoPediatrics Corp.(a)		20,339		1,332,408
Outset Medical, Inc.(a)		68,796		3,401,274
Owens & Minor, Inc.		110,329		3,452,195
Patterson Cos., Inc.		127,815		3,852,344
Pulmonx Corp.(a)(b)		38,148		1,372,565
Retractable Technologies, Inc.(a)		22,619		249,488
SeaSpine Holdings Corp.(a)		50,511		794,538
Senseonics Holdings, Inc.(a)(b)		651,308		2,207,934
Sientra, Inc.(a)		81,563		467,356
STAAR Surgical Co.(a)		71,795		9,227,811
Surmodics, Inc.(a)		20,853		1,159,427
TransMedics Group, Inc.(a)(b)		40,514		1,340,608
Treace Medical Concepts, Inc.(a)		16,003		430,481

SERIES SCHEDULE OF INVESTMENTS 13

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Medical & Dental Instruments & Supplies (continued)
Utah Medical Products, Inc.		5,607	$	520,554
ViewRay, Inc.(a)		220,882		1,592,559
				99,200,711
Medical Equipment(a) — 1.6%
Accuray, Inc.(b)		139,476		550,930
Acutus Medical, Inc.		21,186		187,284
AdaptHealth Corp.(b)		109,766		2,556,450
Alpha Teknova, Inc.		9,420		234,464
Apria, Inc.		22,726		844,271
Bionano Genomics, Inc.(b)		424,973		2,337,352
CareDx, Inc.		76,088		4,821,697
ClearPoint Neuro, Inc.(b)		27,334		485,179
Cytek Biosciences, Inc.		22,296		477,357
Fluidigm Corp.(b)		114,760		756,268
Glaukos Corp.		69,676		3,356,293
Haemonetics Corp.		76,828		5,423,289
Icad, Inc.		29,695		319,221
Inspire Medical Systems, Inc.		41,013		9,551,107
iRadimed Corp.		9,949		334,187
iRhythm Technologies, Inc.		45,126		2,642,579
Lantheus Holdings, Inc.		102,712		2,637,644
Misonix, Inc.		17,761		449,353
Natus Medical, Inc.(b)		50,504		1,266,640
Neuronetics, Inc.(b)		36,640		240,358
Nevro Corp.		52,806		6,145,562
PAVmed, Inc.		106,420		908,827
Quanterix Corp.		47,493		2,364,677
Quotient Ltd.(b)		105,937		247,893
Rapid Micro Biosystems, Inc., Class A		11,718		216,432
Seer, Inc.(b)		63,328		2,186,716
Shockwave Medical, Inc.		51,426		10,587,585
SI-BONE, Inc.		51,670		1,106,771
Silk Road Medical, Inc.		51,381		2,827,496
Soliton, Inc.(b)		18,950		385,822
Stereotaxis, Inc.		67,714		364,301
Tactile Systems Technology, Inc.		28,932		1,286,027
Vapotherm, Inc.		33,189		739,119
Varex Imaging Corp.		59,454		1,676,603
Zynex, Inc.		27,556		313,863
				70,829,617
Medical Services(a) — 0.1%
Aspira Women’s Health, Inc.(b)		130,095		422,809
DermTech, Inc.(b)		35,735		1,147,451
Fulgent Genetics, Inc.(b)		30,574		2,750,131
Innovage Holding Corp.		27,096		179,105
Inotiv, Inc.(b)		18,456		539,653
NeuroPace, Inc.		9,798		155,298
				5,194,447
Metal Fabricating — 0.6%
Compx International, Inc.		2,464		51,202
DMC Global, Inc.(a)		28,677		1,058,468
GrafTech International Ltd.		307,810		3,176,599
Haynes International, Inc.		18,971		706,670
Lawson Products, Inc.(a)		6,868		343,469
MRC Global, Inc.(a)		121,138		889,153
Mueller Industries, Inc.		87,419		3,592,921
Mueller Water Products, Inc., Class A		242,461		3,690,256
NN, Inc.(a)		62,601		328,655

Security	Shares		Value
Metal Fabricating (continued)
Northwest Pipe Co.(a)		14,320	$	339,384
RBC Bearings, Inc.(a)		42,751		9,071,762
Worthington Industries, Inc.		53,223		2,804,852
				26,053,391
Metals & Minerals: Diversified — 0.7%
Commercial Metals Co.		180,840		5,508,386
Compass Minerals International, Inc.		52,140		3,357,816
Constellium SE(a)		184,477		3,464,478
Energy Fuels, Inc.(a)(b)		226,276		1,588,458
Ferroglobe PLC(c)		42,394		—
Gatos Silver, Inc.(a)		69,724		810,890
Hecla Mining Co.		800,957		4,405,263
Intrepid Potash, Inc.(a)		14,601		451,171
Materion Corp.		30,793		2,113,632
Minerals Technologies, Inc.		51,444		3,592,849
MP Materials Corp.(a)		110,313		3,555,388
Oil-Dri Corp. of America		8,646		302,610
Perpetua Resources Corp.(a)		39,494		196,680
PolyMet Mining Corp.(a)(b)		61,631		187,975
SunCoke Energy, Inc.		124,359		780,975
U.S. Silica Holdings, Inc.(a)		111,690		892,403
United States Lime & Minerals, Inc.		3,248		392,358
				31,601,332
Office Supplies & Equipment — 0.3%
ACCO Brands Corp.		141,218		1,213,063
Eastman Kodak Co.(a)(b)		69,585		473,874
Herman Miller, Inc.		112,865		4,250,496
HNI Corp.		65,207		2,394,401
Kimball International, Inc., Class B		54,723		612,897
Pitney Bowes, Inc.		275,637		1,987,343
Steelcase, Inc., Class A		132,169		1,675,903
				12,607,977
Oil & Gas Producers — 0.0%
Kosmos Energy Ltd.(a)		621,587		1,839,898
Oil Well Equipment & Services — 0.7%
Bristow Group, Inc.(a)		28,353		902,476
Cactus, Inc., Class A		84,340		3,181,305
ChampionX Corp.(a)		309,816		6,927,486
Dril-Quip, Inc.(a)		53,209		1,339,803
Frank’s International NV(a)		264,646		778,059
FTS International, Inc., Class A(a)(b)		13,775		338,865
Helix Energy Solutions Group, Inc.(a)		214,480		832,183
Helmerich & Payne, Inc.		160,683		4,404,321
Liberty Oilfield Services, Inc., Class A(a)		142,279		1,725,844
Matrix Service Co.(a)		40,520		423,839
Nabors Industries Ltd.(a)		10,577		1,020,469
National Energy Services Reunited Corp.(a)(b)		55,777		698,328
Newpark Resources, Inc.(a)		134,778		444,767
NexTier Oilfield Solutions, Inc.(a)		245,665		1,130,059
Oceaneering International, Inc.(a)		151,036		2,011,800
Oil States International, Inc.(a)		89,068		569,145
Patterson-UTI Energy, Inc.		283,998		2,555,982
ProPetro Holding Corp.(a)		121,968		1,055,023
RPC, Inc.(a)		88,750		431,325
Select Energy Services, Inc., Class A(a)		87,959		456,507

14

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Oil Well Equipment & Services (continued)
Solaris Oilfield Infrastructure, Inc., Class A		44,889	$	374,374
TETRA Technologies, Inc.(a)		185,918		580,064
				32,182,024
Oil, Gas & Consumable Fuels — 0.1%
Archrock, Inc.		218,921		1,806,098
DHT Holdings, Inc.		217,681		1,421,457
Dorian LPG Ltd.		57,700		716,057
Frontline Ltd.		184,534		1,729,084
				5,672,696
Oil: Crude Producers — 2.6%
Antero Resources Corp.(a)		432,982		8,144,391
Berry Corp.		106,962		771,196
Bonanza Creek Energy, Inc.		46,870		2,245,073
Brigham Minerals, Inc., Class A		63,128		1,209,532
California Resources Corp.(a)		125,549		5,147,509
Callon Petroleum Co.(a)		60,500		2,969,340
Centennial Resource Development, Inc., Class A(a)		274,674		1,840,316
Chesapeake Energy Corp.		149,918		9,233,450
CNX Resources Corp.(a)		328,320		4,143,398
Comstock Resources, Inc.(a)		138,213		1,430,505
Contango Oil & Gas Co.(a)(b)		226,619		1,035,649
CVR Energy, Inc.		46,161		769,042
Denbury, Inc.(a)		76,802		5,395,341
Earthstone Energy, Inc., Class A(a)		32,802		301,778
Extraction Oil & Gas, Inc.(a)		23,858		1,346,784
Falcon Minerals Corp.		63,528		298,582
Gevo, Inc.(a)(b)		294,313		1,954,238
Laredo Petroleum, Inc.(a)(b)		19,197		1,556,301
Magnolia Oil & Gas Corp., Class A		212,568		3,781,585
Meta Materials, Inc.(a)(b)		333,819		1,929,474
Murphy Oil Corp.		222,956		5,567,211
Northern Oil and Gas, Inc.		81,533		1,744,806
Oasis Petroleum, Inc.		30,512		3,033,503
ONE Gas, Inc.		80,107		5,076,381
Ovintiv, Inc.		398,270		13,095,118
PDC Energy, Inc.		151,791		7,193,375
Penn Virginia Corp.(a)		22,943		611,890
Range Resources Corp.(a)		361,839		8,188,417
Riley Exploration Permian, Inc.		3,456		81,147
SM Energy Co.		182,499		4,814,324
Southwestern Energy Co.(a)		1,030,648		5,709,790
Talos Energy, Inc.(a)		56,899		783,499
Tellurian, Inc.(a)		548,908		2,146,230
Ur-Energy, Inc.(a)		266,438		458,273
Vine Energy, Inc., Class A(a)		41,145		677,658
W&T Offshore, Inc.(a)		145,832		542,495
Whiting Petroleum Corp.(a)		59,803		3,493,093
				118,720,694
Oil: Refining & Marketing — 0.3%
Clean Energy Fuels Corp.(a)		237,786		1,937,956
Delek US Holdings, Inc.		99,741		1,792,346
Par Pacific Holdings, Inc.(a)		75,925		1,193,541
PBF Energy, Inc., Class A(a)		146,181		1,895,967
Renewable Energy Group, Inc.(a)		69,048		3,466,210
World Fuel Services Corp.		92,439		3,107,799
				13,393,819
Paints & Coatings — 0.2%
Chase Corp.		11,191		1,143,161

Security	Shares		Value
Paints & Coatings (continued)
Ferro Corp.(a)		124,313	$	2,528,526
HB Fuller Co.		77,999		5,035,616
Kronos Worldwide, Inc.		43,944		545,345
				9,252,648
Paper — 0.2%
Clearwater Paper Corp.(a)		23,817		912,906
Domtar Corp.(a)		75,611		4,123,824
Glatfelter Corp.		66,295		934,759
Neenah, Inc.		25,262		1,177,462
Schweitzer-Mauduit International, Inc.		47,249		1,637,650
Verso Corp., Class A		41,096		852,742
				9,639,343
Personal Care — 0.4%
Beauty Health Co.(a)		131,979		3,427,495
Edgewell Personal Care Co.		81,651		2,963,931
Honest Co., Inc.(a)(b)		38,547		400,118
Nu Skin Enterprises, Inc., Class A		75,485		3,054,878
USANA Health Sciences, Inc.(a)		19,343		1,783,425
Veru, Inc.(a)(b)		95,480		814,444
WD-40 Co.		20,577		4,763,164
				17,207,455
Pharmaceuticals — 2.2%
ACADIA Pharmaceuticals, Inc.(a)(b)		190,329		3,161,365
Aclaris Therapeutics, Inc.(a)		76,857		1,383,426
Aerie Pharmaceuticals, Inc.(a)		68,373		779,452
Alkermes PLC(a)		245,714		7,577,820
Amneal Pharmaceuticals, Inc.(a)		149,149		796,456
Amphastar Pharmaceuticals, Inc.(a)(b)		57,581		1,094,615
Ampio Pharmaceuticals, Inc.(a)(b)		271,916		451,381
Angion Biomedica Corp.(a)(b)		24,033		234,802
Arrowhead Pharmaceuticals, Inc.(a)		154,172		9,624,958
Atea Pharmaceuticals, Inc.(a)(b)		97,104		3,404,466
Athira Pharma, Inc.(a)		48,613		455,990
Avalo Therapeutics, Inc.(a)		57,957		126,346
Axonics, Inc.(a)		69,925		4,551,418
Axsome Therapeutics, Inc.(a)(b)		42,099		1,387,583
Cassava Sciences, Inc.(a)(b)		59,100		3,668,928
Chimerix, Inc.(a)		110,285		682,664
ChromaDex Corp.(a)		84,727		531,238
Citius Pharmaceuticals, Inc.(a)(b)		169,706		344,503
Corcept Therapeutics, Inc.(a)		148,544		2,923,346
CorMedix, Inc.(a)(b)		52,097		242,251
Cyteir Therapeutics, Inc.(a)		11,795		207,002
Dicerna Pharmaceuticals, Inc.(a)		107,094		2,159,015
Durect Corp.(a)		330,083		422,506
Eagle Pharmaceuticals, Inc.(a)		17,404		970,795
Edgewise Therapeutics, Inc.(a)(b)		17,980		298,468
Enanta Pharmaceuticals, Inc.(a)		28,878		1,640,559
Endo International PLC(a)		345,914		1,120,761
Esperion Therapeutics, Inc.(a)(b)		39,709		478,494
Evolus, Inc.(a)		51,241		390,456
Harmony Biosciences Holdings, Inc.(a)(b)		33,492		1,283,748
Heska Corp.(a)		15,256		3,944,286
Ikena Oncology, Inc.(a)(b)		15,652		197,528
Infinity Pharmaceuticals, Inc.(a)		128,670		440,051
Innoviva, Inc.(a)		69,945		1,168,781
Intra-Cellular Therapies, Inc.(a)		107,872		4,021,468
Ironwood Pharmaceuticals, Inc.(a)		222,059		2,900,091
Landos Biopharma, Inc.(a)		8,208		119,837

SERIES SCHEDULE OF INVESTMENTS 15

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Pharmaceuticals (continued)
MEI Pharma, Inc.(a)		169,441	$	467,657
Mind Medicine MindMed, Inc.(a)(b)		548,974		1,279,110
Nuvation Bio, Inc.(a)(b)		101,985		1,013,731
Omthera Pharmaceuticals, Inc.(c)		1,326		—
Oramed Pharmaceuticals, Inc.(a)(b)		45,675		1,003,937
Pacira BioSciences, Inc.(a)		67,293		3,768,408
Paratek Pharmaceuticals, Inc.(a)		68,365		332,254
PetIQ, Inc.(a)		43,291		1,080,976
Prestige Consumer Healthcare, Inc.(a)		75,383		4,229,740
Radius Health, Inc.(a)(b)		70,039		869,184
Rain Therapeutics, Inc.(a)		14,152		211,714
Reata Pharmaceuticals, Inc., Class A(a)(b)		41,657		4,191,111
Revance Therapeutics, Inc.(a)(b)		106,318		2,962,020
Seelos Therapeutics, Inc.(a)		116,865		281,645
SIGA Technologies, Inc.(a)(b)		64,724		478,310
Spectrum Pharmaceuticals, Inc.(a)		283,421		617,858
Supernus Pharmaceuticals, Inc.(a)		74,652		1,990,969
Syndax Pharmaceuticals, Inc.(a)(b)		67,817		1,295,983
Tarsus Pharmaceuticals, Inc.(a)(b)		17,101		368,527
Terns Pharmaceuticals, Inc.(a)		12,074		125,811
TG Therapeutics, Inc.(a)(b)		195,606		6,509,768
TherapeuticsMD, Inc.(a)		504,604		374,113
Theravance Biopharma, Inc.(a)		83,329		616,635
Tonix Pharmaceuticals Holding Corp.(a)(b)		490,626		294,915
Zogenix, Inc.(a)		84,910		1,289,783
				100,841,013
Photography — 0.0%
GoPro, Inc., Class A(a)(b)		189,273		1,771,595
Plastics — 0.1%
Trinseo SA		57,755		3,117,615
Power Transmission Equipment — 0.2%
Advanced Energy Industries, Inc.		58,563		5,138,903
Babcock & Wilcox Enterprises, Inc.(a)		83,634		536,094
Powell Industries, Inc.		13,696		336,511
Vicor Corp.(a)		32,268		4,329,075
				10,340,583
Printing & Copying Services(a) — 0.2%
Casella Waste Systems, Inc., Class A		76,170		5,784,350
Cimpress PLC		26,653		2,314,280
				8,098,630
Producer Durables: Miscellaneous — 0.0%
First Advantage Corp.(a)(b)		38,735		737,902
Park-Ohio Holdings Corp.		13,595		346,944
				1,084,846
Production Technology Equipment — 0.5%
Axcelis Technologies, Inc.(a)		49,360		2,321,401
Cohu, Inc.(a)		74,642		2,384,065
Ichor Holdings Ltd.(a)		43,766		1,798,345
Onto Innovation, Inc.(a)		73,287		5,294,986
Photronics, Inc.(a)		93,999		1,281,206
Ultra Clean Holdings, Inc.(a)		65,723		2,799,800
Veeco Instruments, Inc.(a)		72,417		1,608,382
Xperi Holding Corp.		160,911		3,031,563
				20,519,748
Publishing — 0.2%
Daily Journal Corp.(a)		1,917		614,149
Eros STX Global Corp.(a)		485,200		446,142

Security	Shares		Value
Publishing (continued)
Gannett Co., Inc.(a)		200,394	$	1,338,632
John Wiley & Sons, Inc., Class A		65,886		3,439,908
Meredith Corp.(a)		61,136		3,405,275
Scholastic Corp.		43,239		1,541,470
				10,785,576
Radio & TV Broadcasters — 0.4%
Entravision Communications Corp., Class A		88,471		628,144
Gray Television, Inc.		131,240		2,994,897
iHeartMedia, Inc., Class A(a)(b)		171,185		4,283,049
Liberty Media Corp.-Liberty Braves, Class A(a)		14,423		388,123
Liberty Media Corp.-Liberty Braves, Class C(a)(b)		55,028		1,453,840
Sinclair Broadcast Group, Inc., Class A		67,750		2,146,320
TEGNA, Inc.		338,813		6,681,392
				18,575,765
Railroad Equipment — 0.1%
Greenbrier Cos., Inc.		47,548		2,044,089
Trinity Industries, Inc.		120,079		3,262,546
				5,306,635
Real Estate — 0.7%
Cushman & Wakefield PLC(a)		209,845		3,905,215
eXp World Holdings, Inc.		93,478		3,717,620
Kennedy-Wilson Holdings, Inc.		182,632		3,820,661
Newmark Group, Inc., Class A		225,166		3,222,126
Realogy Holdings Corp.(a)		175,973		3,086,566
Redfin Corp.(a)(b)		154,624		7,746,662
Retail Value, Inc.		26,815		706,039
RMR Group, Inc., Class A		22,731		760,352
St. Joe Co.		49,727		2,093,507
Tejon Ranch Co.(a)		32,564		578,337
				29,637,085
Real Estate Investment Trusts (REITs) — 6.5%
Acadia Realty Trust		130,884		2,671,342
AFC Gamma, Inc.		10,773		232,481
Agree Realty Corp.		102,245		6,771,686
Alexander & Baldwin, Inc.		110,075		2,580,158
Alexander’s, Inc.		3,225		840,499
American Assets Trust, Inc.		76,906		2,877,822
American Finance Trust, Inc.		186,406		1,498,704
Apartment Investment and Management Co., Class A		224,921		1,540,709
Apollo Commercial Real Estate Finance, Inc.		214,194		3,176,497
Apple Hospitality REIT, Inc.		326,329		5,133,155
Arbor Realty Trust, Inc.		201,832		3,739,947
Ares Commercial Real Estate Corp.		62,781		946,737
Armada Hoffler Properties, Inc.		89,285		1,193,740
ARMOUR Residential REIT, Inc.		119,299		1,286,043
Ashford Hospitality Trust, Inc.(a)		27,598		406,243
Blackstone Mortgage Trust, Inc., Class A		221,185		6,706,329
Braemar Hotels & Resorts, Inc.(a)		67,993		329,766
Brandywine Realty Trust		263,181		3,531,889
BrightSpire Capital, Inc.		129,290		1,214,033
Broadmark Realty Capital, Inc.		189,714		1,870,580
Broadstone Net Lease, Inc.		232,445		5,766,960
BRT Apartments Corp.		16,395		316,096
Capstead Mortgage Corp.		143,530		960,216
CareTrust REIT, Inc.		149,492		3,037,677
Catchmark Timber Trust, Inc., Class A		76,183		904,292
Centerspace		21,354		2,017,953
Chatham Lodging Trust(a)		71,747		878,901

16

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Real Estate Investment Trusts (REITs) (continued)
City Office REIT, Inc.		66,662	$	1,190,583
Clipper Realty, Inc.		23,302		188,746
Community Healthcare Trust, Inc.		37,930		1,714,057
CoreCivic, Inc.(a)		182,732		1,626,315
Corporate Office Properties Trust		170,412		4,597,716
CTO Realty Growth, Inc.		9,099		489,162
DiamondRock Hospitality Co.(a)		323,151		3,053,777
DigitalBridge Group, Inc.(a)		726,977		4,383,671
Diversified Healthcare Trust		362,135		1,227,638
Dynex Capital, Inc.		45,934		793,740
Easterly Government Properties, Inc.		132,524		2,737,946
EastGroup Properties, Inc.		60,373		10,059,953
Ellington Financial, Inc.		70,337		1,286,464
Empire State Realty Trust, Inc., Class A		212,920		2,135,588
Equity Commonwealth(a)		175,606		4,562,244
Essential Properties Realty Trust, Inc.		177,858		4,965,795
Farmland Partners, Inc.		43,014		515,738
Four Corners Property Trust, Inc.		117,543		3,157,205
Franklin Street Properties Corp.		148,831		690,576
Geo Group, Inc.		181,328		1,354,520
Getty Realty Corp.		60,118		1,762,059
Gladstone Commercial Corp.		57,026		1,199,257
Gladstone Land Corp.		40,162		914,489
Global Medical REIT, Inc.		93,832		1,379,330
Global Net Lease, Inc.		152,801		2,447,872
Granite Point Mortgage Trust, Inc.		91,236		1,201,578
Great Ajax Corp.		35,257		475,617
Healthcare Realty Trust, Inc.		220,155		6,556,216
Hersha Hospitality Trust(a)		52,620		490,945
Independence Realty Trust, Inc.		159,885		3,253,660
Indus Realty Trust, Inc.		4,483		314,258
Industrial Logistics Properties Trust		98,858		2,511,982
Innovative Industrial Properties, Inc.		36,423		8,419,905
Invesco Mortgage Capital, Inc.		439,731		1,385,153
iStar, Inc.		105,086		2,635,557
Kite Realty Group Trust		126,506		2,575,662
KKR Real Estate Finance Trust, Inc.		54,000		1,139,400
Lexington Realty Trust		423,117		5,394,742
LTC Properties, Inc.		59,517		1,886,094
Mack-Cali Realty Corp.(a)		131,036		2,243,336
MFA Financial, Inc.		689,374		3,150,439
Monmouth Real Estate Investment Corp.		145,021		2,704,642
National Health Investors, Inc.		68,544		3,667,104
National Storage Affiliates Trust		122,968		6,491,481
New York Mortgage Trust, Inc.		586,018		2,496,437
NexPoint Residential Trust, Inc.		34,729		2,149,031
Office Properties Income Trust		73,057		1,850,534
One Liberty Properties, Inc.		25,572		779,690
Orchid Island Capital, Inc.		185,669		907,921
Outfront Media, Inc.		221,842		5,590,418
Paramount Group, Inc.		281,875		2,534,056
Pebblebrook Hotel Trust		195,467		4,380,415
PennyMac Mortgage Investment Trust		151,398		2,981,027
Phillips Edison & Co., Inc.		24,055		738,729
Physicians Realty Trust		326,051		5,745,019
Piedmont Office Realty Trust, Inc., Class A		188,849		3,291,638
Plymouth Industrial REIT, Inc.		46,393		1,055,441
Postal Realty Trust, Inc., Class A		14,866		277,102
PotlatchDeltic Corp.		100,444		5,180,901
Preferred Apartment Communities, Inc.		78,063		954,710

Security	Shares		Value
Real Estate Investment Trusts (REITs) (continued)
PS Business Parks, Inc.		30,397	$	4,764,426
Ready Capital Corp.		89,562		1,292,380
Redwood Trust, Inc.		173,328		2,234,198
Retail Opportunity Investments Corp.		179,348		3,124,242
Retail Properties of America, Inc., Class A		326,363		4,203,555
RLJ Lodging Trust		252,091		3,746,072
RPT Realty		124,389		1,587,204
Sabra Health Care REIT, Inc.		331,229		4,875,691
Safehold, Inc.		27,053		1,944,840
Saul Centers, Inc.		18,784		827,623
Seritage Growth Properties, Class A(a)		60,705		900,255
Service Properties Trust		249,927		2,801,682
STAG Industrial, Inc.		247,302		9,706,603
Summit Hotel Properties, Inc.(a)		157,085		1,512,729
Sunstone Hotel Investors, Inc.(a)		330,699		3,948,546
Tanger Factory Outlet Centers, Inc.		150,303		2,449,939
Terreno Realty Corp.		105,853		6,693,085
TPG RE Finance Trust, Inc.		91,270		1,129,923
UMH Properties, Inc.		66,822		1,530,224
Uniti Group, Inc.		295,200		3,651,624
Universal Health Realty Income Trust		19,651		1,086,111
Urban Edge Properties		177,499		3,250,007
Urstadt Biddle Properties, Inc., Class A		46,471		879,696
Washington Real Estate Investment Trust		126,525		3,131,494
Whitestone REIT		63,460		620,639
Xenia Hotels & Resorts, Inc.(a)		171,661		3,045,266
				293,213,790
Real Estate Management & Development(a) — 0.1%
Bluegreen Vacations Holding Corp.		22,087		569,845
CorePoint Lodging, Inc.		63,254		980,437
Fathom Holdings, Inc.(b)		7,107		189,757
Forestar Group, Inc.		25,815		480,933
Rafael Holdings, Inc., Class B(b)		14,154		434,952
				2,655,924
Recreational Vehicles & Boats — 0.3%
Arcimoto, Inc.(a)(b)		42,318		483,695
Camping World Holdings, Inc., Class A		64,814		2,519,320
Lazydays Holdings, Inc.(a)		10,594		226,076
LCI Industries		37,202		5,008,505
Malibu Boats, Inc., Class A(a)		31,562		2,208,709
Marine Products Corp.		12,431		155,512
MasterCraft Boat Holdings, Inc.(a)(b)		28,157		706,178
Winnebago Industries, Inc.		50,479		3,657,203
				14,965,198
Rental & Leasing Services: Consumer — 0.5%
Avis Budget Group, Inc.(a)		74,086		8,631,760
Rent-A-Center, Inc.		99,286		5,580,866
WillScot Mobile Mini Holdings Corp.(a)(b)		317,724		10,078,205
				24,290,831
Restaurants — 1.4%
Biglari Holdings, Inc., Class B(a)		1,622		278,676
BJ’s Restaurants, Inc.(a)		33,625		1,404,180
Bloomin’ Brands, Inc.(a)		132,890		3,322,250
Brinker International, Inc.(a)		70,134		3,440,073
Carrols Restaurant Group, Inc.		50,844		186,089
Cheesecake Factory, Inc.(a)		69,976		3,288,872
Cracker Barrel Old Country Store, Inc.		36,215		5,064,306
Dave & Buster’s Entertainment, Inc.(a)		65,125		2,496,241
Del Taco Restaurants, Inc.		41,933		366,075

SERIES SCHEDULE OF INVESTMENTS 17

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Restaurants (continued)
Denny’s Corp.(a)(b)		102,838	$	1,680,373
Dine Brands Global, Inc.(a)		24,420		1,983,148
El Pollo Loco Holdings, Inc.(a)		27,176		459,274
Esports Technologies, Inc.(a)(b)		17,117		574,618
Fiesta Restaurant Group, Inc.(a)(b)		26,448		289,870
Hall of Fame Resort & Entertainment Co.(a)		82,051		217,435
Jack in the Box, Inc.		33,474		3,258,024
Kura Sushi USA, Inc., Class A(a)(b)		5,130		224,078
Nathan’s Famous, Inc.		4,875		298,204
Noodles & Co.(a)		67,772		799,710
ONE Group Hospitality, Inc.(a)(b)		27,429		293,216
Papa John’s International, Inc.		50,084		6,360,167
Red Robin Gourmet Burgers, Inc.(a)		23,276		536,745
Rush Street Interactive, Inc.(a)		78,534		1,508,638
Ruth’s Hospitality Group, Inc.(a)		49,520		1,025,559
Shake Shack, Inc., Class A(a)		57,167		4,485,323
Texas Roadhouse, Inc.		106,190		9,698,333
Wingstop, Inc.		45,388		7,440,455
				60,979,932
Scientific Instruments: Control & Filter — 0.6%
Arlo Technologies, Inc.(a)		121,287		777,450
Brady Corp., Class A		70,935		3,596,405
CIRCOR International, Inc.(a)		29,639		978,383
Energy Recovery, Inc.(a)		62,036		1,180,545
ESCO Technologies, Inc.		39,773		3,062,521
Gorman-Rupp Co.		33,421		1,196,806
Helios Technologies, Inc.		50,414		4,139,494
Napco Security Technologies, Inc.(a)		20,827		897,227
Resideo Technologies, Inc.(a)		217,974		5,403,575
Thermon Group Holdings, Inc.(a)		50,449		873,272
Watts Water Technologies, Inc., Class A		41,587		6,990,359
				29,096,037
Scientific Instruments: Electrical — 0.6%
Advent Technologies Holdings, Inc.(a)(b)		24,565		213,716
Allied Motion Technologies, Inc.		17,656		552,280
Atkore, Inc.(a)		70,758		6,150,285
AZZ, Inc.		38,572		2,052,031
EnerSys		65,675		4,888,847
Franklin Electric Co., Inc.		70,391		5,620,721
FTC Solar, Inc.(a)(b)		28,767		224,095
Preformed Line Products Co.		4,580		297,883
Romeo Power, Inc.(a)		190,475		942,851
WESCO International, Inc.(a)(b)		67,816		7,820,541
				28,763,250
Scientific Instruments: Gauges & Meters — 0.3%
Badger Meter, Inc.		44,358		4,486,368
FARO Technologies, Inc.(a)		27,502		1,809,907
Itron, Inc.(a)		68,866		5,208,336
Luna Innovations, Inc.(a)(b)		44,281		420,669
Mesa Laboratories, Inc.		7,312		2,210,856
Transcat, Inc.(a)(b)		10,356		667,755
Vishay Precision Group, Inc.(a)		19,811		688,828
				15,492,719
Scientific Instruments: Pollution Control — 0.3%
CECO Environmental Corp.(a)		50,515		355,626
Covanta Holding Corp.		182,171		3,665,280
Evoqua Water Technologies Corp.(a)		176,080		6,613,565
Heritage-Crystal Clean, Inc.(a)		23,588		683,580

Security	Shares		Value
Scientific Instruments: Pollution Control (continued)
Sharps Compliance Corp.(a)		23,152	$	191,467
Team, Inc.(a)		44,286		133,301
US Ecology, Inc.(a)		48,476		1,568,199
				13,211,018
Securities Brokerage & Services — 0.1%
BGC Partners, Inc., Class A		509,209		2,652,979
StoneX Group, Inc.(a)		25,339		1,669,840
				4,322,819
Semiconductors & Components — 2.1%
Alpha & Omega Semiconductor Ltd.(a)		32,249		1,011,651
Amkor Technology, Inc.		155,567		3,881,397
Atomera, Inc.(a)		30,157		696,325
AXT, Inc.(a)(b)		60,435		503,424
CEVA, Inc.(a)		33,442		1,426,970
CMC Materials, Inc.		43,949		5,415,835
Diodes, Inc.(a)		65,762		5,957,380
DSP Group, Inc.(a)		36,248		794,194
EMCORE Corp.(a)		53,291		398,617
FormFactor, Inc.(a)		116,643		4,354,283
Kopin Corp.(a)		116,604		598,178
Kulicke & Soffa Industries, Inc.		93,000		5,420,040
Lattice Semiconductor Corp.(a)		205,615		13,293,010
MACOM Technology Solutions Holdings, Inc., Class H(a)		73,492		4,767,426
MaxLinear, Inc.(a)		109,127		5,374,505
Power Integrations, Inc.		91,758		9,083,124
Rambus, Inc.(a)		165,133		3,665,953
Semtech Corp.(a)		99,096		7,726,515
Silicon Laboratories, Inc.(a)		67,401		9,446,924
SiTime Corp.(a)		19,859		4,054,612
SkyWater Technology, Inc.(a)(b)		11,711		318,539
SMART Global Holdings, Inc.(a)		26,574		1,182,543
Vishay Intertechnology, Inc.		198,415		3,986,157
				93,357,602
Semiconductors & Semiconductor Equipment — 0.2%
Ambarella, Inc.(a)		53,173		8,281,163
Shipping — 0.5%
A-Mark Precious Metals, Inc.		13,073		784,641
Eagle Bulk Shipping, Inc.(a)(b)		13,991		705,426
Genco Shipping & Trading Ltd.		48,588		978,076
Golar LNG Ltd.(a)		153,782		1,994,553
International Seaways, Inc.		70,537		1,285,184
Matson, Inc.		65,281		5,268,830
Nordic American Tankers Ltd.		225,308		576,788
Safe Bulkers, Inc.(a)(b)		83,629		432,362
Scorpio Tankers, Inc.		74,867		1,388,034
SFL Corp. Ltd.		169,168		1,417,628
SITE Centers Corp.		263,679		4,071,204
Teekay Corp.(a)		100,908		369,323
Teekay Tankers Ltd., Class A(a)		35,500		515,815
Tidewater, Inc.(a)		67,412		812,989
Two Harbors Investment Corp.		476,847		3,023,210
				23,624,063
Software(a) — 0.2%
Castlight Health, Inc., Class B		165,644		260,061
Couchbase, Inc.		14,847		461,890
CS Disco, Inc.		19,444		932,145
EverCommerce, Inc.		24,143		398,118

18

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Software (continued)
Instructure Holdings, Inc.		16,757	$	378,541
Intapp, Inc.		14,616		376,508
Kaltura, Inc.		25,079		258,063
MeridianLink, Inc.		18,512		413,928
Model N, Inc.(b)		53,164		1,780,994
Qualys, Inc.		51,826		5,767,716
				11,027,964
Specialty Retail — 2.3%
1-800-Flowers.com, Inc., Class A(a)		40,523		1,236,357
Aaron’s Co., Inc.		50,244		1,383,720
Abercrombie & Fitch Co., Class A(a)		93,735		3,527,248
Academy Sports & Outdoors, Inc.(a)		117,698		4,710,274
Alta Equipment Group, Inc.(a)		25,535		350,596
American Eagle Outfitters, Inc.		228,811		5,903,324
America’s Car-Mart, Inc.(a)		9,390		1,096,564
Arko Corp.(a)		110,240		1,113,424
Asbury Automotive Group, Inc.(a)		29,257		5,756,022
Barnes & Noble Education, Inc.(a)		57,082		570,249
Bed Bath & Beyond, Inc.(a)		159,847		2,761,357
Big 5 Sporting Goods Corp.		31,459		724,815
Blink Charging Co.(a)(b)		55,247		1,580,617
Boot Barn Holdings, Inc.(a)		43,409		3,857,758
Buckle, Inc.		44,307		1,754,114
Caleres, Inc.		54,533		1,211,723
CarLotz, Inc.(a)		108,646		413,941
Cato Corp., Class A		31,728		524,781
Chico’s FAS, Inc.(a)		182,679		820,229
Children’s Place, Inc.(a)		21,467		1,615,606
Citi Trends, Inc.(a)		14,379		1,049,092
Conn’s, Inc.(a)		27,774		634,080
Container Store Group, Inc.(a)		47,106		448,449
Designer Brands, Inc., Class A(a)		92,336		1,286,240
Genesco, Inc.(a)(b)		22,064		1,273,755
Group 1 Automotive, Inc.		26,444		4,968,299
Guess?, Inc.		60,371		1,268,395
Haverty Furniture Cos., Inc.		24,812		836,412
Hibbett, Inc.		25,072		1,773,593
JOANN, Inc.(b)		17,579		195,830
Lands’ End, Inc.(a)(b)		24,446		575,459
Lumber Liquidators Holdings, Inc.(a)		43,286		808,582
MarineMax, Inc.(a)		31,838		1,544,780
Monro, Inc.		49,817		2,864,976
Murphy USA, Inc.		36,544		6,112,349
National Vision Holdings, Inc.(a)(b)		125,793		7,141,269
ODP Corp.(a)		70,903		2,847,464
OneWater Marine, Inc., Class A		14,774		594,063
Party City Holdco, Inc.(a)	��	167,392		1,188,483
RealReal, Inc.(a)		119,632		1,576,750
Regis Corp.(a)		35,144		122,301
Sally Beauty Holdings, Inc.(a)		171,266		2,885,832
Shift Technologies, Inc.(a)(b)		92,987		645,330
Shoe Carnival, Inc.		28,626		928,055
Sonic Automotive, Inc., Class A		32,409		1,702,769
Sportsman’s Warehouse Holdings, Inc.(a)		65,177		1,147,115
Stamps.com, Inc.(a)		26,872		8,862,117
Tilly’s, Inc., Class A		36,062		505,229
Torrid Holdings, Inc.(a)(b)		18,211		280,996
TravelCenters of America, Inc.(a)		18,773		934,708

Security	Shares		Value
Specialty Retail (continued)
Urban Outfitters, Inc.(a)		104,673	$	3,107,741
Zumiez, Inc.(a)(b)		32,366		1,286,872
				102,310,104
Steel — 0.2%
Allegheny Technologies, Inc.(a)(b)		192,929		3,208,409
Carpenter Technology Corp.		71,719		2,348,080
Olympic Steel, Inc.		14,995		365,278
Ryerson Holding Corp.		24,661		549,201
Schnitzer Steel Industries, Inc., Class A		38,117		1,669,906
TimkenSteel Corp.(a)		69,113		903,998
				9,044,872
Technology: Miscellaneous — 0.3%
Aeva Technologies, Inc.(a)(b)		116,238		922,930
Benchmark Electronics, Inc.		54,239		1,448,724
CTS Corp.		48,687		1,504,915
Fabrinet(a)		56,249		5,766,085
Kimball Electronics, Inc.(a)		36,993		953,309
Plexus Corp.(a)		42,785		3,825,407
				14,421,370
Telecommunications Equipment(a) — 0.3%
Akoustis Technologies, Inc.		76,033		737,520
CalAmp Corp.		52,331		520,693
Cambium Networks Corp.		16,382		592,865
Clearfield, Inc.(b)		17,213		759,954
Knowles Corp.(b)		136,482		2,557,673
Viavi Solutions, Inc.		344,698		5,425,546
Vocera Communications, Inc.		51,289		2,346,985
				12,941,236
Textile Products — 0.0%
Interface, Inc.		87,070		1,319,111
Unifi, Inc.(a)		21,341		468,008
				1,787,119
Textiles Apparel & Shoes — 0.7%
Crocs, Inc.(a)		93,851		13,465,741
Fossil Group, Inc.(a)		71,549		847,856
G-III Apparel Group Ltd.(a)		66,829		1,891,261
Kontoor Brands, Inc.		78,818		3,936,959
Oxford Industries, Inc.		25,042		2,258,037
PLBY Group, Inc.(a)		35,923		846,705
Rocky Brands, Inc.		10,512		500,476
Steven Madden Ltd.		124,318		4,992,611
Superior Group of Cos., Inc.		17,077		397,723
Vera Bradley, Inc.(a)		34,772		327,205
Wolverine World Wide, Inc.		122,143		3,644,747
				33,109,321
Thrifts & Mortgage Finance — 0.2%
22nd Century Group, Inc.(a)		225,030		666,089
Blue Foundry Bancorp(a)		41,952		578,518
Greenlane Holdings, Inc., Class A(a)		13,787		32,675
Turning Point Brands, Inc.		23,259		1,110,617
Universal Corp.		36,468		1,762,499
Vector Group Ltd.		224,543		2,862,923
				7,013,321
Toys — 0.0%
Funko, Inc., Class A(a)		39,036		710,846
Transportation Miscellaneous — 0.2%
Costamare, Inc.		76,637		1,187,107

SERIES SCHEDULE OF INVESTMENTS 19

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series (Percentages shown are based on Net Assets)

Security	Shares		Value
Transportation Miscellaneous (continued)
Echo Global Logistics, Inc.(a)		41,046	$	1,958,305
Hub Group, Inc., Class A(a)		50,235		3,453,656
Textainer Group Holdings Ltd.(a)		73,007		2,548,674
				9,147,742
Truckers — 0.6%
ArcBest Corp.		38,425		3,142,012
Covenant Logistics Group, Inc.(a)		17,465		482,907
Daseke, Inc.(a)(b)		70,869		652,704
Forward Air Corp.		40,972		3,401,496
FRP Holdings, Inc.(a)		10,729		599,966
Heartland Express, Inc.		71,615		1,147,272
Marten Transport Ltd.		89,906		1,410,625
PAM Transportation Services, Inc.(a)		6,494		292,100
Saia, Inc.(a)		40,077		9,539,528
Universal Logistics Holdings, Inc.		12,578		252,566
US Xpress Enterprises, Inc., Class A(a)(b)		35,947		310,223
Werner Enterprises, Inc.		94,671		4,191,085
Yellow Corp.(a)(b)		74,942		423,422
				25,845,906
Utilities: Electrical — 1.0%
ALLETE, Inc.		78,775		4,688,688
Avista Corp.		106,375		4,161,390
Black Hills Corp.		95,276		5,979,522
Clearway Energy, Inc., Class A		60,105		1,694,961
Clearway Energy, Inc., Class C		118,585		3,589,568
MGE Energy, Inc.		55,564		4,083,954
NorthWestern Corp.		79,006		4,527,044
Otter Tail Corp.		61,581		3,446,688
PNM Resources, Inc.		129,388		6,402,118
Portland General Electric Co.		135,410		6,362,916
Unitil Corp.		21,914		937,481
				45,874,330
Utilities: Gas Distributors — 0.5%
Chesapeake Utilities Corp.		26,238		3,149,872
New Jersey Resources Corp.		148,931		5,184,288
Northwest Natural Holding Co.		46,253		2,127,176
South Jersey Industries, Inc.		153,143		3,255,820
Southwest Gas Holdings, Inc.		88,271		5,903,565
Spire, Inc.		76,241		4,664,424
				24,285,145
Utilities: Miscellaneous — 0.2%
Brookfield Infrastructure Corp., Class A(b)		82,706		4,952,435
Ormat Technologies, Inc.		68,530		4,564,784
				9,517,219
Utilities: Telecommunications — 0.9%
8x8, Inc.(a)(b)		167,048		3,907,253
ATN International, Inc.		16,240		760,844
Cogent Communications Holdings, Inc.		64,595		4,575,910
Consolidated Communications Holdings, Inc.(a)		111,749		1,026,973
Globalstar, Inc.(a)(b)		915,952		1,529,640
IDT Corp., Class B(a)		30,847		1,294,032
Iridium Communications, Inc.(a)		180,132		7,178,260
j2 Global, Inc.(a)		66,134		9,035,227
Radius Global Infrastructure, Inc., Class A(a)		89,671		1,464,327
Shenandoah Telecommunications Co.		73,368		2,316,961
Telephone & Data Systems, Inc.		153,417		2,991,632
United States Cellular Corp.(a)		21,987		701,165
Vonage Holdings Corp.(a)		371,498		5,988,548
				42,770,772

Security	Shares		Value
Utilities: Water — 0.4%
American States Water Co.		56,208	$	4,806,908
Artesian Resources Corp., Class A		13,005		496,401
California Water Service Group		78,200		4,608,326
Global Water Resources, Inc.		19,411		363,374
Middlesex Water Co.		26,037		2,676,083
Pure Cycle Corp.(a)		31,022		412,903
SJW Group		42,757		2,824,527
York Water Co.		20,459		893,649
				17,082,171
Total Common Stocks — 98.5% (Cost: $3,199,588,221)				4,446,268,929
	Par (000)
Corporate Bonds
Asset Management & Custodian — 0.0%
GAMCO Investors, Inc., 4.00%, 06/15/23(f)	$	17		16,916
Total Corporate Bonds — 0.0% (Cost: $17,000)				16,916
	Shares
Investment Companies
Equity Funds — 0.5% iShares Russell 2000 ETF(b)(d)		101,958		22,303,313
Total Investment Companies — 0.5% (Cost: $21,822,552)				22,303,313
Total Long-Term Investments —99.0% (Cost: $3,221,427,773)				4,468,589,158
Short-Term Securities
Money Market Funds — 7.4%
BlackRock Cash Funds: Institutional, SL Agency Shares, 0.08%(d)(g)(h)		291,896,984		292,042,933
BlackRock Cash Funds: Treasury, SL Agency Shares, 0.01%(d)(g)		40,942,684		40,942,684
Total Short-Term Securities —7.4% (Cost: $332,875,011)				332,985,617
Total Investments — 106.4% (Cost: $3,554,302,784)				4,801,574,775
Liabilities in Excess of Other Assets — (6.4)%				(290,081,226	)
Net Assets — 100.0%			$	4,511,493,549

^(a)  Non-income producing security.

^(b)  All or a portion of this security is on loan.

^(c)  Security is valued using significant unobservable inputs and is classified as Level 3 in the fair value hierarchy.

^(d)  Affiliate of the Series.

^(e)  Security exempt from registration pursuant to Rule 144A under the Securities Act of 1933, as amended. These securities may be resold in transactions exempt from registration to qualified institutional investors.

^(f)  Step coupon security. Coupon rate will either increase (step-up bond) or decrease (step-down bond) at regular intervals until maturity. Interest rate shown reflects the rate currently in effect.

20

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series

^(g) Annualized 7-day yield as of period end.

^(h)  All or a portion of this security was purchased with the cash collateral from loaned securities.

For Series compliance purposes, the Series’s industry classifications refer to one or more of the industry sub-classifications used by one or more widely recognized market indexes or rating group indexes, and/or as defined by the investment adviser. These definitions may not apply for purposes of this report, which may combine such industry sub-classifications for reporting ease.

Affiliates

Investments in issuers considered to be affiliate(s) of the Series during the period ended September 30, 2021 for purposes of Section 2(a)(3) of the Investment Company Act of 1940, as amended, were as follows:

Affiliated Issuer	Value at 12/31/20		Purchases at Cost			Proceeds from Sales			Net Realized Gain (Loss)		Change in Unrealized Appreciation (Depreciation)			Value at 09/30/21		Shares Held at 09/30/21		Income			Capital Gain Distributions from Underlying Funds
908 Devices, Inc.(a)	$	N/A	$	865,395		$	—		$	—	$	(221,759	)	$	643,636		19,792	$	—		$	—
BlackRock Cash Funds: Institutional, SL Agency Shares		294,236,196		—			(2,156,576	)(b)		15,220		(51,907	)		292,042,933		291,896,984		1,557,860	(c)		—
BlackRock Cash Funds: Treasury, SL Agency Shares		14,601,134		26,341,550	(b)		—			—		—			40,942,684		40,942,684		3,848			—
iShares Russell 2000 ETF		8,597,035		180,554,680			(168,216,773	)��		2,492,869		(1,124,498	)		22,303,313		101,958		216,431			—
									$	2,508,089	$	(1,398,164	)	$	355,932,566			$	1,778,139		$	—

^(a)  As of the beginning of the period, the entity was not considered an affiliate.

^(b)  Represents net amount purchased (sold).

^(c)  All or a portion represents securities lending income earned from the reinvestment of cash collateral from loaned securities, net of fees and collateral investment expenses, and other payments to and from borrowers of securities.

Derivative Financial Instruments Outstanding as of Period End

Futures Contracts

Description	Number of Contracts		Expiration Date		Notional Amount (000)	Value/ Unrealized Appreciation (Depreciation)
Long Contracts
Russell 2000 E-Mini Index		379		12/17/21	$41,705	$	(266,990	)

OTC Total Return Swaps

Reference Entity	Payment Frequency	Counterparty(a)	Termination Date		Net Notional		Accrued Unrealized Appreciation (Depreciation)			Net Value of Reference Entity		Gross Notional Amount Net Asset Percentage
Equity Securities Long	Monthly	Goldman Sachs Bank USA(b)		02/27/23		$196,806	$	20,471	(c)	$	217,329		0.0	%(d)
	Monthly	HSBC Bank USA N.A.(e)		02/10/23		1,339,866		21,583	(f)		1,361,663		0.0	(d)
	Monthly	JPMorgan Chase Bank N.A.(g)		02/08/23		1,136,817		77,297	(h)		1,212,823		0.0	(d)
							$	119,351		$	2,791,815

^(a)  The Series receives the total return on a portfolio of long positions underlying the total return swap. The Series pays the total return on a portfolio of short positions underlying the total return swap. In addition, the Series pays or receives a variable rate of interest, based on a specified benchmark. The benchmark and spread are determined based upon the country and/or currency of the individual underlying positions.

^(c) Amount includes $(52) of net dividends and financing fees.

^(d)  Rounds to less than 0.1%.

^(f)  Amount includes $(214) of net dividends and financing fees.

^(h)  Amount includes $1,291 of net dividends and financing fees.

The following are the specified benchmarks (plus or minus a range) used in determining the variable rate of interest:

SERIES SCHEDULE OF INVESTMENTS 21

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series

OTC Total Return Swaps (continued)

	(b)	(e)	(g)
Range:	65 basis points	65 basis points	65 basis points
Benchmarks:	USD - 1D Overnight Fed Funds Effective Rate (FEDL01)	USD - 1D Overnight Bank Funding Rate (OBFR01)	USD - 1D Overnight Bank Funding Rate (OBFR01)

The following table represents the individual long positions and related values of the equity securities underlying the total return swap with Goldman Sachs Bank USA as of period end, termination date February 27, 2023:

Security	Shares		Value		% of Basket Value
Reference Entity — Long
Common Stocks
Banks: Diversified
Central Pacific Financial Corp.		277	$	7,113		3.3	%
Hanmi Financial Corp.		3,913		78,495		36.1
				85,608
Banks: Savings, Thrift & Mortgage Lending
Homestreet, Inc.		3,201		131,721		60.6
Net Value of Reference Entity — Goldman     Sachs Bank USA			$217,329

The following table represents the individual long positions and related values of the equity securities underlying the total return swap with HSBC Bank PLC as of period end, termination date February 10, 2023:

Security	Shares		Value		% of Basket Value
Reference Entity — Long
Common Stocks
Banks: Diversified
Hope Bancorp, Inc.		5,357	$	77,355		5.7	%
Preferred Bank		1,394		92,952		6.8
United Community Banks Inc.		6,981		229,116		16.8
				399,423
Banks: Savings, Thrift & Mortgage Lending
Berkshire Hills Bancorp, Inc.		1,918		51,748		3.8

Security	Shares		Value		% of Basket Value
Insurance: Property-Casualty
James River Group Holdings Ltd.		6,372	$	240,416		17.7	%
Oil, Gas & Consumable Fuels
Green Plains Inc.		20,523		670,076		49.2
Net Value of Reference Entity — HSBC     Bank PLC			$1,361,663

The following table represents the individual long positions and related values of the equity securities underlying the total return swap with JPMorgan Chase Bank N.A. as of period end, termination date February 8, 2023:

Security	Shares		Value		% of Basket Value
Reference Entity — Long
Common Stocks
Banks: Diversified
Banner Corp.		131	$	7,233		0.6	%
Central Pacific Financial Corp.		6,077		156,057		12.9
Hanmi Financial Corp.		7,638		153,218		12.6
United Community Banks, Inc.		908		29,801		2.5
			346,309
Insurance: Property-Casualty
Pacific Premier Bancorp, Inc.		19,697		816,243		67.3
ProAssurance Corp.		2,114		50,271		4.1
			866,514
Net Value of Reference Entity —     JPMorgan Chase Bank N.A			$1,212,823

Fair Value Hierarchy as of Period End

Various inputs are used in determining the fair value of financial instruments. These inputs to valuation techniques are categorized into a fair value hierarchy consisting of three broad levels for financial reporting purposes as follows:

• Level 1 – Unadjusted price quotations in active markets/exchanges for identical assets or liabilities that the Series has the ability to access;

• Level 2 – Other observable inputs (including, but not limited to, quoted prices for similar assets or liabilities in markets that are active, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates) or other market–corroborated inputs); and

22

Schedule of Investments  (unaudited) (continued) September 30, 2021 Master Small Cap Index Series

Fair Value Hierarchy as of Period End (continued)

• Level 3 – Unobservable inputs based on the best information available in the circumstances, to the extent observable inputs are not available (including the BlackRock Global Valuation Methodologies Committee’s (the “Global Valuation Committee’s”) assumptions used in determining the fair value of financial instruments).

The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. The inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the fair value hierarchy classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Investments classified within Level 3 have significant unobservable inputs used by the Global Valuation Committee in determining the price for Fair Valued Investments. Level 3 investments include equity or debt issued by privately held companies or funds. There may not be a secondary market, and/or there are a limited number of investors. The categorization of a value determined for financial instruments is based on the pricing transparency of the financial instruments and is not necessarily an indication of the risks associated with investing in those securities. For information about the Series’s policy regarding valuation of financial instruments, refer to its most recent financial statements.

The following table summarizes the Series’s financial instruments categorized in the fair value hierarchy. The breakdown of the Series’s financial instruments into major categories is disclosed in the Schedule of Investments above.

	Level 1			Level 2		Level 3		Total
Assets
Investments
Long-Term Investments
Common Stocks	$	4,446,202,102		$	—	$	66,827	$	4,446,268,929
Corporate Bonds		—			16,916		—		16,916
Investment Companies		22,303,313			—		—		22,303,313
Short-Term Securities
Money Market Funds		332,985,617			—		—		332,985,617
	$	4,801,491,032		$	16,916	$	66,827	$	4,801,574,775
Derivative Financial Instruments(a)
Assets
Equity Contracts	$	—		$	119,351	$	—	$	119,351
Liabilities
Equity Contracts		(266,990	)		—		—		(266,990	)
	$	(266,990	)	$	119,351	$	—	$	(147,639	)

^(a)  Derivative financial instruments are swaps and futures contracts. Swaps and futures contracts are valued at the unrealized appreciation (depreciation) on the instrument.

Currency Abbreviation
USD	United States Dollar
Portfolio Abbreviation
ETF	Exchange-Traded Fund
REIT	Real Estate Investment Trust

SERIES SCHEDULE OF INVESTMENTS 23