T.
ROWE
PRICE
Mid-Cap
Index
Fund
March
31,
2022
(Unaudited)
1
Portfolio
of
Investments
‡
Shares
$
Value
(Cost
and
value
in
$000s)
‡
COMMON
STOCKS
99.9%
COMMUNICATION
SERVICES
3.7%
Entertainment
1.6%
Liberty
Media-Liberty
Formula
One,
Class
A (1)
552
35
Liberty
Media-Liberty
Formula
One,
Class
C (1)
4,599
321
Madison
Square
Garden
Sports (1)
441
79
Playtika
Holding (1)
2,319
45
Roku (1)
2,738
343
Skillz,
Class
A (1)(2)
6,847
21
Spotify
Technology (1)
3,208
484
World
Wrestling
Entertainment,
Class
A (2)
1,022
64
Zynga,
Class
A (1)
23,909
221
1,613
Interactive
Media
&
Services
0.6%
IAC/InterActiveCorp (1)
1,779
178
Pinterest,
Class
A (1)
13,228
326
TripAdvisor (1)
2,361
64
Vimeo (1)
3,287
39
607
Media
1.5%
Altice
USA,
Class
A (1)
4,719
59
Cable
One
125
183
Liberty
Broadband,
Class
A (1)
549
72
Liberty
Broadband,
Class
C (1)
3,270
442
Liberty
Media-Liberty
SiriusXM,
Class
A (1)
2,165
99
Liberty
Media-Liberty
SiriusXM,
Class
C (1)
3,707
170
Loyalty
Ventures (1)
458
8
New
York
Times,
Class
A
3,863
177
Nexstar
Media
Group,
Class
A
917
173
Sirius
XM
Holdings (2)
20,268
134
1,517
Total
Communication
Services
3,737
CONSUMER
DISCRETIONARY
10.4%
Auto
Components
0.5%
Gentex
5,509
161
Lear
1,397
199
QuantumScape (1)(2)
5,746
115
475
Automobiles
0.4%
Harley-Davidson
3,515
138
Rivian
Automotive,
Class
A (1)
3,434
173
T.
ROWE
PRICE
Mid-Cap
Index
Fund
2
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Thor
Industries (2)
1,241
98
409
Diversified
Consumer
Services
1.0%
ADT
3,580
27
Bright
Horizons
Family
Solutions (1)
1,399
186
Chegg (1)
3,153
114
Frontdoor (1)
1,893
56
Grand
Canyon
Education (1)
925
90
H&R
Block
3,773
98
Mister
Car
Wash (1)
1,753
26
Service
Corp
International
3,732
246
Terminix
Global
Holdings (1)
2,785
127
970
Hotels,
Restaurants
&
Leisure
2.3%
Aramark
5,392
203
Boyd
Gaming
1,913
126
Choice
Hotels
International
812
115
Churchill
Downs
858
190
DraftKings,
Class
A (1)(2)
7,164
139
Hyatt
Hotels,
Class
A (1)
1,153
110
Marriott
Vacations
Worldwide
969
153
Planet
Fitness,
Class
A (1)
1,939
164
Six
Flags
Entertainment (1)
1,802
78
Travel
+
Leisure
1,976
114
Vail
Resorts
928
242
Wendy's
4,159
91
Wyndham
Hotels
&
Resorts
2,134
181
Yum
China
Holdings
9,958
414
2,320
Household
Durables
0.5%
Leggett
&
Platt
3,053
106
Tempur
Sealy
International
4,146
116
Toll
Brothers
2,543
120
TopBuild (1)
769
139
481
Internet
&
Direct
Marketing
Retail
0.6%
DoorDash,
Class
A (1)
3,405
399
Qurate
Retail,
Series
A
8,123
39
Wayfair,
Class
A (1)(2)
1,772
196
634
Leisure
Products
0.8%
Brunswick
1,792
145
Mattel (1)
8,116
180
T.
ROWE
PRICE
Mid-Cap
Index
Fund
3
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Peloton
Interactive,
Class
A (1)
6,930
183
Polaris
1,329
140
YETI
Holdings (1)
1,993
120
768
Multiline
Retail
0.3%
Kohl's
3,215
195
Nordstrom
2,584
70
Ollie's
Bargain
Outlet
Holdings (1)
1,492
64
329
Specialty
Retail
2.3%
AutoNation (1)
964
96
Burlington
Stores (1)
1,543
281
Carvana (1)
1,817
217
Dick's
Sporting
Goods (2)
1,405
140
Five
Below (1)
1,282
203
Floor
&
Decor
Holdings,
Class
A (1)
2,368
192
Foot
Locker
2,073
61
GameStop,
Class
A (1)(2)
1,493
249
Gap
4,772
67
Leslie's (1)(2)
3,628
70
Lithia
Motors
685
206
Penske
Automotive
Group
697
65
Petco
Health
&
Wellness (1)(2)
1,234
24
RH (1)
408
133
Victoria's
Secret (1)
1,744
90
Vroom (1)(2)
2,632
7
Williams-Sonoma
1,688
245
2,346
Textiles,
Apparel
&
Luxury
Goods
1.7%
Capri
Holdings (1)
3,360
173
Carter's
967
89
Columbia
Sportswear
915
83
Deckers
Outdoor (1)
628
172
Hanesbrands
8,087
120
Lululemon
Athletica (1)
2,649
967
Skechers
USA,
Class
A (1)
3,070
125
1,729
Total
Consumer
Discretionary
10,461
CONSUMER
STAPLES
2.8%
Beverages
0.7%
Boston
Beer,
Class
A (1)
217
84
Keurig
Dr
Pepper
16,240
616
700
T.
ROWE
PRICE
Mid-Cap
Index
Fund
4
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Food
&
Staples
Retailing
0.5%
Albertsons,
Class
A
3,723
124
Casey's
General
Stores
858
170
Grocery
Outlet
Holding (1)(2)
2,044
67
U.S.
Foods
Holding (1)
5,141
193
554
Food
Products
1.3%
Beyond
Meat (1)(2)
1,360
66
Bunge
3,195
354
Darling
Ingredients (1)
3,757
302
Flowers
Foods
4,409
113
Freshpet (1)
952
98
Hain
Celestial
Group (1)
2,060
71
Ingredion
1,562
136
Pilgrim's
Pride (1)
1,060
26
Post
Holdings (1)
1,339
93
Seaboard
6
25
1,284
Household
Products
0.1%
Reynolds
Consumer
Products
1,212
36
Spectrum
Brands
Holdings
935
83
119
Personal
Products
0.2%
Coty,
Class
A (1)
7,894
71
Herbalife
Nutrition (1)
2,373
72
Olaplex
Holdings (1)
1,831
29
172
Total
Consumer
Staples
2,829
ENERGY
2.2%
Energy
Equipment
&
Services
0.2%
NOV
9,069
178
178
Oil,
Gas
&
Consumable
Fuels
2.0%
Antero
Midstream
7,893
86
Cheniere
Energy
5,442
755
Continental
Resources
1,517
93
DT
Midstream
2,250
122
EQT
7,081
244
HF
Sinclair (1)
3,426
136
New
Fortress
Energy
591
25
Targa
Resources
5,237
395
T.
ROWE
PRICE
Mid-Cap
Index
Fund
5
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Texas
Pacific
Land
137
185
2,041
Total
Energy
2,219
FINANCIALS
13.9%
Banks
2.9%
Bank
of
Hawaii
929
78
Bank
OZK
2,770
118
BOK
Financial
704
66
Commerce
Bancshares
2,569
184
Cullen/Frost
Bankers
1,329
184
East
West
Bancorp
3,282
259
First
Citizens
BancShares,
Class
A
283
189
First
Hawaiian
2,973
83
First
Horizon
12,302
289
FNB
7,977
99
PacWest
Bancorp
2,673
115
Pinnacle
Financial
Partners
1,730
159
Popular
1,844
151
Prosperity
Bancshares
2,080
144
Synovus
Financial
3,380
166
Umpqua
Holdings
4,906
93
Webster
Financial
4,151
233
Western
Alliance
Bancorp
2,417
200
Wintrust
Financial
1,321
123
2,933
Capital
Markets
5.0%
Affiliated
Managers
Group
945
133
Ares
Management,
Class
A
3,302
268
Blackstone
Group
16,290
2,068
Carlyle
Group
3,800
186
Evercore,
Class
A
889
99
Interactive
Brokers
Group,
Class
A
1,871
123
Janus
Henderson
Group
3,870
135
Jefferies
Financial
Group
4,988
164
KKR
12,925
756
Lazard,
Class
A
2,336
81
LPL
Financial
Holdings
1,851
338
Morningstar
545
149
SEI
Investments
2,489
150
Stifel
Financial
2,376
161
Tradeweb
Markets,
Class
A
2,442
215
Virtu
Financial,
Class
A
2,049
76
5,102
T.
ROWE
PRICE
Mid-Cap
Index
Fund
6
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Consumer
Finance
0.8%
Ally
Financial
7,852
341
Credit
Acceptance (1)(2)
183
101
OneMain
Holdings
2,549
121
SLM
6,487
119
Upstart
Holdings (1)(2)
1,120
122
804
Diversified
Financial
Services
0.9%
Apollo
Global
Management
8,570
531
Equitable
Holdings
8,149
252
Voya
Financial
2,568
171
954
Insurance
3.3%
Alleghany (1)
309
262
American
Financial
Group
1,578
230
Arch
Capital
Group (1)
8,641
418
Assured
Guaranty
1,571
100
Axis
Capital
Holdings
1,806
109
Brighthouse
Financial (1)
1,808
93
CNA
Financial
616
30
Erie
Indemnity,
Class
A
585
103
Fidelity
National
Financial
6,342
310
First
American
Financial
2,479
161
GoHealth,
Class
A (1)(2)
1,026
1
Hanover
Insurance
Group
832
124
Kemper
1,403
79
Lemonade (1)(2)
852
22
Markel (1)
314
463
Mercury
General
588
32
Old
Republic
International
6,516
169
Primerica
913
125
Reinsurance
Group
of
America
1,561
171
RenaissanceRe
Holdings
1,013
161
Unum
Group
4,747
150
White
Mountains
Insurance
Group
66
75
3,388
Mortgage
Real
Estate
Investment
Trusts
0.7%
AGNC
Investment,
REIT
12,206
160
Annaly
Capital
Management,
REIT
32,860
231
New
Residential
Investment,
REIT
10,089
111
Starwood
Property
Trust,
REIT
6,742
163
665
T.
ROWE
PRICE
Mid-Cap
Index
Fund
7
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Thrifts
&
Mortgage
Finance
0.3%
MGIC
Investment
7,441
101
New
York
Community
Bancorp
10,524
113
Rocket,
Class
A
3,029
34
TFS
Financial
1,098
18
UWM
Holdings
2,012
9
275
Total
Financials
14,121
HEALTH
CARE
9.9%
Biotechnology
3.3%
Alnylam
Pharmaceuticals (1)
2,787
455
BioMarin
Pharmaceutical (1)
4,241
327
CureVac (1)(2)
1,185
23
Exact
Sciences (1)
4,019
281
Exelixis (1)
7,208
164
Horizon
Therapeutics (1)
5,072
534
Ionis
Pharmaceuticals (1)
3,270
121
Iovance
Biotherapeutics (1)
3,383
56
Mirati
Therapeutics (1)
978
81
Natera (1)
1,950
79
Neurocrine
Biosciences (1)
2,177
204
Novavax (1)
1,756
129
Sage
Therapeutics (1)
1,146
38
Sarepta
Therapeutics (1)
1,940
152
Seagen (1)
3,138
452
Ultragenyx
Pharmaceutical (1)
1,518
110
United
Therapeutics (1)
1,027
184
3,390
Health
Care
Equipment
&
Supplies
1.8%
Envista
Holdings (1)
3,766
184
Figs,
Class
A (1)
1,684
36
Globus
Medical,
Class
A (1)
1,825
135
ICU
Medical (1)
454
101
Insulet (1)
1,537
409
Integra
LifeSciences
Holdings (1)
1,685
108
Masimo (1)
1,164
169
Novocure (1)
2,382
197
Penumbra (1)
805
179
Quidel (1)
858
97
Tandem
Diabetes
Care (1)
1,442
168
Zimvie (1)
453
10
1,793
T.
ROWE
PRICE
Mid-Cap
Index
Fund
8
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Health
Care
Providers
&
Services
1.0%
Acadia
Healthcare (1)
2,060
135
agilon
health (1)
3,895
99
Amedisys (1)
747
129
Chemed
345
175
Encompass
Health
2,272
161
Guardant
Health (1)(2)
2,092
139
Oak
Street
Health (1)(2)
2,195
59
Premier,
Class
A
2,764
98
Signify
Health,
Class
A (1)
1,499
27
1,022
Health
Care
Technology
1.1%
Certara (1)
2,540
55
Change
Healthcare (1)
5,830
127
Definitive
Healthcare (1)
450
11
Teladoc
Health (1)(2)
3,514
253
Veeva
Systems,
Class
A (1)
3,219
684
1,130
Life
Sciences
Tools
&
Services
1.8%
10X
Genomics,
Class
A (1)
1,969
150
Adaptive
Biotechnologies (1)
2,425
34
Avantor (1)
13,993
473
Azenta
1,705
141
Bruker
2,383
153
Maravai
LifeSciences
Holdings,
Class
A (1)
2,562
90
QIAGEN (1)(2)
5,279
259
Repligen (1)
1,273
240
Sotera
Health (1)
2,223
48
Syneos
Health (1)
2,367
192
1,780
Pharmaceuticals
0.9%
Elanco
Animal
Health (1)
10,351
270
Jazz
Pharmaceuticals (1)
1,394
217
Nektar
Therapeutics (1)
4,029
22
Perrigo
3,114
120
Royalty
Pharma,
Class
A
7,563
294
923
Total
Health
Care
10,038
INDUSTRIALS
&
BUSINESS
SERVICES
13.4%
Aerospace
&
Defense
1.4%
Axon
Enterprise (1)
1,510
208
BWX
Technologies
2,147
116
Curtiss-Wright
909
137
T.
ROWE
PRICE
Mid-Cap
Index
Fund
9
Shares
$
Value
(Cost
and
value
in
$000s)
‡
HEICO
1,037
159
HEICO,
Class
A
1,830
232
Hexcel
1,948
116
Mercury
Systems (1)
1,307
84
Spirit
AeroSystems
Holdings,
Class
A
2,441
119
Virgin
Galactic
Holdings (1)(2)
4,021
40
Woodward
1,435
179
1,390
Air
Freight
&
Logistics
0.2%
GXO
Logistics (1)
2,254
161
161
Airlines
0.2%
Copa
Holdings,
Class
A (1)(2)
703
59
JetBlue
Airways (1)
7,382
110
169
Building
Products
1.5%
Advanced
Drainage
Systems
1,428
170
Armstrong
World
Industries
1,109
100
AZEK (1)
2,627
65
Builders
FirstSource (1)
4,405
284
Carlisle
1,194
294
Hayward
Holdings (1)
1,106
18
Lennox
International
768
198
Owens
Corning
2,332
213
Trex (1)
2,693
176
1,518
Commercial
Services
&
Supplies
0.5%
Clean
Harbors (1)
1,180
132
Driven
Brands
Holdings (1)
1,188
31
IAA (1)
3,144
120
MSA
Safety
855
113
Stericycle (1)
2,132
126
522
Construction
&
Engineering
0.6%
AECOM
3,111
239
MasTec (1)
1,346
117
MDU
Resources
4,698
125
Valmont
Industries
490
117
598
Electrical
Equipment
1.7%
Acuity
Brands
806
153
ChargePoint
Holdings (1)(2)
5,185
103
Fluence
Energy (1)
828
11
T.
ROWE
PRICE
Mid-Cap
Index
Fund
10
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Hubbell
1,259
231
nVent
Electric
3,879
135
Plug
Power (1)
11,896
340
Regal
Rexnord
1,568
233
Sensata
Technologies
Holding (1)
3,620
184
Shoals
Technologies
Group,
Class
A (1)
2,369
41
Sunrun (1)
4,714
143
Vertiv
Holdings
7,497
105
1,679
Machinery
2.1%
AGCO
1,452
212
Allison
Transmission
Holdings
2,419
95
Crane
1,150
125
Donaldson
2,876
149
Enovis (1)
3,241
129
Flowserve
3,033
109
Gates
Industrial (1)
2,122
32
Graco
3,904
272
ITT
2,007
151
Lincoln
Electric
Holdings
1,336
184
Middleby (1)
1,281
210
Oshkosh
1,544
156
Timken
1,498
91
Toro
2,437
208
2,123
Marine
0.1%
Kirby (1)
1,390
100
100
Professional
Services
2.1%
Booz
Allen
Hamilton
Holding
3,054
268
CACI
International,
Class
A (1)
541
163
Clarivate (1)
10,833
182
CoStar
Group (1)
9,102
606
Dun
&
Bradstreet
Holdings (1)
3,799
66
FTI
Consulting (1)
781
123
Legalzoom.com (1)
2,129
30
ManpowerGroup
1,265
119
Science
Applications
International
1,326
122
TransUnion
4,448
460
2,139
Road
&
Rail
2.3%
AMERCO
209
125
Knight-Swift
Transportation
Holdings
3,742
189
Landstar
System
890
134
T.
ROWE
PRICE
Mid-Cap
Index
Fund
11
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Lyft,
Class
A (1)
6,844
263
Ryder
System
1,217
97
Schneider
National,
Class
B
1,152
29
TuSimple
Holdings,
Class
A (1)
3,028
37
Uber
Technologies (1)
37,507
1,338
XPO
Logistics (1)
2,254
164
2,376
Trading
Companies
&
Distributors
0.7%
Air
Lease
2,496
111
Core
&
Main,
Class
A (1)
1,237
30
MSC
Industrial
Direct,
Class
A
1,047
89
SiteOne
Landscape
Supply (1)
1,026
166
Univar
Solutions (1)
3,898
125
Watsco
760
232
753
Total
Industrials
&
Business
Services
13,528
INFORMATION
TECHNOLOGY
28.9%
Communications
Equipment
0.5%
Ciena (1)
3,587
217
CommScope
Holding (1)
4,487
35
Lumentum
Holdings (1)(2)
1,688
165
Ubiquiti (2)
143
42
Viasat (1)
1,650
81
540
Electronic
Equipment,
Instruments
&
Components
1.4%
Arrow
Electronics (1)
1,567
186
Avnet
2,315
94
Cognex
3,975
307
Coherent (1)
569
156
Jabil
3,254
201
Littelfuse
558
139
National
Instruments
3,090
125
TD
SYNNEX
971
100
Vontier
3,945
100
1,408
IT
Services
7.3%
Amdocs
2,860
235
Block,
Class
A (1)
11,151
1,512
Bread
Financial
Holdings
1,181
66
Cloudflare,
Class
A (1)
6,086
729
Concentrix
981
163
Euronet
Worldwide (1)
1,179
153
Fastly,
Class
A (1)
2,357
41
T.
ROWE
PRICE
Mid-Cap
Index
Fund
12
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Genpact
4,262
185
Globant (1)
940
246
GoDaddy,
Class
A (1)
3,903
327
Kyndryl
Holdings (1)
5,084
67
MongoDB (1)
1,475
654
Okta (1)
2,929
442
Paysafe (1)
7,998
27
Sabre (1)
7,588
87
Shift4
Payments,
Class
A (1)(2)
1,019
63
Snowflake,
Class
A (1)
4,703
1,078
SolarWinds
805
11
StoneCo,
Class
A (1)
5,020
59
Switch,
Class
A
2,677
83
Thoughtworks
Holding (1)
930
19
Twilio,
Class
A (1)
3,870
638
Western
Union
9,144
171
WEX (1)
1,040
186
Wix.com (1)
1,242
130
7,372
Semiconductors
&
Semiconductor
Equipment
3.5%
Allegro
MicroSystems (1)(2)
895
25
Cirrus
Logic (1)
1,327
113
Entegris
3,129
411
First
Solar (1)
2,466
207
GLOBALFOUNDRIES (1)
1,224
76
Marvell
Technology
19,590
1,405
MKS
Instruments
1,286
193
ON
Semiconductor (1)
9,837
616
Universal
Display
1,007
168
Wolfspeed (1)
2,682
305
3,519
Software
15.6%
Alteryx,
Class
A (1)
1,371
98
Anaplan (1)
3,336
217
Aspen
Technology (1)
1,554
257
Atlassian,
Class
A (1)
3,238
951
Avalara (1)
1,993
198
Bentley
Systems,
Class
B
3,214
142
Bill.com
Holdings (1)
2,170
492
Black
Knight (1)
3,537
205
C3.ai,
Class
A (1)(2)
1,400
32���
CDK
Global
2,724
133
Coupa
Software (1)
1,733
176
Crowdstrike
Holdings,
Class
A (1)
4,631
1,052
Datadog,
Class
A (1)
5,910
895
T.
ROWE
PRICE
Mid-Cap
Index
Fund
13
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Datto
Holding (1)(2)
527
14
DocuSign (1)
4,483
480
Dolby
Laboratories,
Class
A
1,497
117
DoubleVerify
Holdings (1)
1,302
33
Dropbox,
Class
A (1)
6,916
161
Duck
Creek
Technologies (1)
1,700
38
Dynatrace (1)
4,629
218
Elastic (1)
1,745
155
Everbridge (1)
883
39
Fair
Isaac (1)
592
276
Five9 (1)
1,571
173
Guidewire
Software (1)
1,953
185
HubSpot (1)
1,047
497
Informatica,
Class
A (1)
819
16
Jamf
Holding (1)(2)
1,193
42
Mandiant (1)
5,463
122
Manhattan
Associates (1)
1,473
204
N-able (1)
905
8
nCino (1)
1,253
51
NCR (1)
2,919
117
New
Relic (1)
1,230
82
Nutanix,
Class
A (1)
4,986
134
Palantir
Technologies,
Class
A (1)
38,575
530
Palo
Alto
Networks (1)
2,246
1,398
Paycor
HCM (1)
1,050
31
Paylocity
Holding (1)
925
190
Pegasystems
954
77
Procore
Technologies (1)
1,389
81
RingCentral,
Class
A (1)
1,901
223
Smartsheet,
Class
A (1)
2,791
153
Splunk (1)
3,688
548
SS&C
Technologies
Holdings
5,209
391
Teradata (1)
2,512
124
Trade
Desk,
Class
A (1)
10,089
699
Unity
Software (1)
3,502
347
VMware,
Class
A
5,177
589
Workday,
Class
A (1)
4,456
1,067
Zendesk (1)
2,802
337
Zoom
Video
Communications,
Class
A (1)
5,057
593
Zscaler (1)
1,833
442
15,830
Technology
Hardware,
Storage
&
Peripherals
0.6%
Dell
Technologies,
Class
C (1)
6,304
316
Pure
Storage,
Class
A (1)
6,347
224
T.
ROWE
PRICE
Mid-Cap
Index
Fund
14
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Xerox
Holdings
3,013
61
601
Total
Information
Technology
29,270
MATERIALS
4.8%
Chemicals
1.5%
Ashland
Global
Holdings
1,200
118
Axalta
Coating
Systems (1)
4,751
117
Chemours
3,648
115
Diversey
Holdings (1)
1,722
13
Element
Solutions
5,393
118
Huntsman
4,826
181
NewMarket
142
46
Olin
3,296
172
RPM
International
2,969
242
Scotts
Miracle-Gro
957
118
Valvoline
4,220
133
Westlake
773
95
1,468
Construction
Materials
0.1%
Eagle
Materials
902
116
116
Containers
&
Packaging
1.1%
AptarGroup
1,528
180
Ardagh
Metal
Packaging (1)
2,448
20
Berry
Global
Group (1)
3,144
182
Crown
Holdings
2,858
357
Graphic
Packaging
Holding
6,577
132
Silgan
Holdings
1,955
90
Sonoco
Products
2,284
143
1,104
Metals
&
Mining
1.9%
Alcoa
4,279
385
Cleveland-Cliffs (1)
10,377
334
Reliance
Steel
&
Aluminum
1,449
266
Royal
Gold
1,525
215
Southern
Copper
1,961
149
Steel
Dynamics
4,381
366
United
States
Steel
6,018
227
1,942
Paper
&
Forest
Products
0.2%
Louisiana-Pacific
2,043
127
T.
ROWE
PRICE
Mid-Cap
Index
Fund
15
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Sylvamo (1)
794
26
153
Total
Materials
4,783
REAL
ESTATE
7.9%
Equity
Real
Estate
Investment
Trusts
7.2%
American
Campus
Communities,
REIT
3,186
178
American
Homes
4
Rent,
Class
A,
REIT
6,846
274
Americold
Realty
Trust,
REIT
6,209
173
Apartment
Income
REIT
3,656
195
Brixmor
Property
Group,
REIT
6,889
178
Camden
Property
Trust,
REIT
2,297
382
Cousins
Properties,
REIT
3,398
137
CubeSmart,
REIT
5,069
264
Douglas
Emmett,
REIT
3,906
131
EPR
Properties,
REIT
1,727
94
Equity
LifeStyle
Properties,
REIT
4,114
315
First
Industrial
Realty
Trust,
REIT
2,994
185
Gaming
&
Leisure
Properties,
REIT
5,419
254
Healthcare
Trust
of
America,
Class
A,
REIT
5,067
159
Highwoods
Properties,
REIT
2,383
109
Hudson
Pacific
Properties,
REIT
3,398
94
Invitation
Homes,
REIT
13,868
557
JBG
SMITH
Properties,
REIT
2,854
83
Kilroy
Realty,
REIT
2,701
206
Lamar
Advertising,
Class
A,
REIT
2,005
233
Life
Storage,
REIT
1,895
266
Medical
Properties
Trust,
REIT
13,741
291
National
Retail
Properties,
REIT
4,089
184
Omega
Healthcare
Investors,
REIT
5,555
173
Orion
Office
REIT
1,280
18
Park
Hotels
&
Resorts,
REIT
5,524
108
Rayonier,
REIT
3,311
136
Rexford
Industrial
Realty,
REIT
3,736
279
SL
Green
Realty,
REIT (2)
1,576
128
Spirit
Realty
Capital,
REIT
2,966
137
STORE
Capital,
REIT
5,687
166
Sun
Communities,
REIT
2,662
467
VICI
Properties,
REIT
14,619
416
WP
Carey,
REIT
4,393
355
7,325
Real
Estate
Management
&
Development
0.7%
Howard
Hughes (1)
968
101
Jones
Lang
LaSalle (1)
1,174
281
Opendoor
Technologies,
Class
A (1)
10,636
92
T.
ROWE
PRICE
Mid-Cap
Index
Fund
16
Shares
$
Value
(Cost
and
value
in
$000s)
‡
Zillow
Group,
Class
A (1)
1,413
68
Zillow
Group,
Class
C (1)(2)
3,833
189
731
Total
Real
Estate
8,056
UTILITIES
2.0%
Electric
Utilities
1.0%
Avangrid
1,356
63
Hawaiian
Electric
Industries
2,458
104
IDACORP
1,173
135
OGE
Energy
4,646
190
PG&E (1)
46,225
552
1,044
Gas
Utilities
0.3%
National
Fuel
Gas
2,033
140
UGI
4,841
175
315
Independent
Power
&
Renewable
Electricity
Producers
0.4%
Brookfield
Renewable,
Class
A
2,976
130
Vistra
11,139
259
389
Water
Utilities
0.3%
Essential
Utilities
5,361
274
274
Total
Utilities
2,022
Total
Common
Stocks
(Cost
$106,273)
101,064
SHORT-TERM
INVESTMENTS
0.0%
Money
Market
Funds
0.0%
T.
Rowe
Price
Government
Reserve
Fund,
0.29% (3)(4)
1,030
1
Total
Short-Term
Investments
(Cost
$1)
1
T.
ROWE
PRICE
Mid-Cap
Index
Fund
17
Shares
$
Value
(Cost
and
value
in
$000s)
‡
SECURITIES
LENDING
COLLATERAL
2.6%
INVESTMENTS
IN
A
POOLED
ACCOUNT
THROUGH
SECURITIES
LENDING
PROGRAM
WITH
STATE
STREET
BANK
AND
TRUST
COMPANY
2.6%
Money
Market
Funds
2.6%
T.
Rowe
Price
Government
Reserve
Fund,
0.29% (3)(4)
2,640,554
2,641
Total
Investments
in
a
Pooled
Account
through
Securities
Lending
Program
with
State
Street
Bank
and
Trust
Company
2,641
Total
Securities
Lending
Collateral
(Cost
$2,641)
2,641
Total
Investments
in
Securities
102.5%
(Cost
$108,915)
$
103,706
Other
Assets
Less
Liabilities
(2.5)%
(
2,497
)
Net
Assets
100.0%
$
101,209
‡
Shares
are
denominated
in
U.S.
dollars
unless
otherwise
noted.
(1)
Non-income
producing
(2)
All
or
a
portion
of
this
security
is
on
loan
at
March
31,
2022.
(3)
Seven-day
yield
(4)
Affiliated
Companies
REIT
A
domestic
Real
Estate
Investment
Trust
whose
distributions
pass-through
with
original
tax
character
to
the
shareholder
T.
ROWE
PRICE
Mid-Cap
Index
Fund
18
The
accompanying
notes
are
an
integral
part
of
this
Portfolio
of
Investments.
AFFILIATED
COMPANIES
($000s)
The
fund
may
invest
in
certain
securities
that
are
considered
affiliated
companies.
As
defined
by
the
1940
Act,
an
affiliated
company
is
one
in
which
the
fund
owns
5%
or
more
of
the
outstanding
voting
securities,
or
a
company
that
is
under
common
ownership
or
control.
The
following
securities
were
considered
affiliated
companies
for
all
or
some
portion
of
the
three
months
ended
March
31,
2022.
Net
realized
gain
(loss),
investment
income,
change
in
net
unrealized
gain/loss,
and
purchase
and
sales
cost
reflect
all
activity
for
the
period
then
ended.
Affiliate
Net
Realized
Gain
(Loss)
Change
in
Net
Unrealized
Gain/Loss
Investment
Income
T.
Rowe
Price
Government
Reserve
Fund,
0.29%
$
—
$
—
$
—
++
Totals
$
—
#
$
—
$
—
+
Supplementary
Investment
Schedule
Affiliate
Value
12/31/21
Purchase
Cost
Sales
Cost
Value
03/31/22
T.
Rowe
Price
Government
Reserve
Fund,
0.29%
$
1,337
¤
¤
$
2,642
Total
$
2,642
^
#
Capital
gain
distributions
from
mutual
funds
represented
$0
of
the
net
realized
gain
(loss).
++
Excludes
earnings
on
securities
lending
collateral,
which
are
subject
to
rebates
and
fees.
+
Investment
income
comprised
$0
of
dividend
income
and
$0
of
interest
income.
¤
Purchase
and
sale
information
not
shown
for
cash
management
funds.
^
The
cost
basis
of
investments
in
affiliated
companies
was
$2,642.
T.
ROWE
PRICE
Mid-Cap
Index
Fund
Unaudited
Notes
to
Portfolio
of
Investments
19
T.
Rowe
Price
Mid-Cap
Index
Fund (the
fund) is
registered
under
the
Investment
Company
Act
of
1940
(the
1940
Act)
as
an
open-end
management
investment
company
and
follows
accounting
and
reporting
guidance
of
the
Financial
Accounting
Standards
Board
Accounting
Standards
Codification
Topic
946.
The
accompanying
Portfolio
of
Investments
was
prepared
in
accordance
with
accounting
principles
generally
accepted
in
the
United
States
of
America
(GAAP).
For
additional
information
on
the
fund’s
significant
accounting
policies
and
investment
related
disclosures,
please
refer
to
the
fund’s most
recent
semiannual
or
annual
shareholder
report
and
its
prospectus.
VALUATION
Fair
Value
The
fund’s
financial
instruments
are
valued
at
the
close
of
the
New
York
Stock
Exchange
(NYSE),
normally
4
p.m.
ET,
each
day
the
NYSE
is
open
for
business,
and
are
reported
at
fair
value,
which
GAAP
defines
as
the
price
that
would
be
received
to
sell
an
asset
or
paid
to
transfer
a
liability
in
an
orderly
transaction
between
market
participants
at
the
measurement
date. The
T.
Rowe
Price
Valuation
Committee
(the
Valuation
Committee)
is
an
internal
committee
that
has
been
delegated
certain
responsibilities
by
the
fund’s
Board
of
Directors
(the
Board)
to
ensure
that
financial
instruments
are
appropriately
priced
at
fair
value
in
accordance
with
GAAP
and
the
1940
Act.
Subject
to
oversight
by
the
Board,
the
Valuation
Committee
develops
and
oversees
pricing-related
policies
and
procedures
and
approves
all
fair
value
determinations.
Specifically,
the
Valuation
Committee
establishes
policies
and
procedures
used
in
valuing
financial
instruments,
including
those
which
cannot
be
valued
in
accordance
with
normal
procedures
or
using
pricing
vendors;
determines
pricing
techniques,
sources,
and
persons
eligible
to
effect
fair
value
pricing
actions;
evaluates
the
services
and
performance
of
the
pricing
vendors;
oversees
the
pricing
process
to
ensure
policies
and
procedures
are
being
followed;
and
provides
guidance
on
internal
controls
and
valuation-related
matters.
The
Valuation
Committee
provides
periodic
reporting
to
the
Board
on
valuation
matters.
Various
valuation
techniques
and
inputs
are
used
to
determine
the
fair
value
of
financial
instruments.
GAAP
establishes
the
following
fair
value
hierarchy
that
categorizes
the
inputs
used
to
measure
fair
value:
Level
1
–
quoted
prices
(unadjusted)
in
active
markets
for
identical
financial
instruments
that
the
fund
can
access
at
the
reporting
date
Level
2
–
inputs
other
than
Level
1
quoted
prices
that
are
observable,
either
directly
or
indirectly
(including,
but
not
limited
to,
quoted
prices
for
similar
financial
instruments
in
active
markets,
quoted
prices
for
identical
or
similar
financial
instruments
in
inactive
markets,
interest
rates
and
yield
curves,
implied
volatilities,
and
credit
spreads)
T.
ROWE
PRICE
Mid-Cap
Index
Fund
20
Level
3
–
unobservable
inputs
(including
the fund’s
own
assumptions
in
determining
fair
value)
Observable
inputs
are
developed
using
market
data,
such
as
publicly
available
information
about
actual
events
or
transactions,
and
reflect
the
assumptions
that
market
participants
would
use
to
price
the
financial
instrument.
Unobservable
inputs
are
those
for
which
market
data
are
not
available
and
are
developed
using
the
best
information
available
about
the
assumptions
that
market
participants
would
use
to
price
the
financial
instrument.
GAAP
requires
valuation
techniques
to
maximize
the
use
of
relevant
observable
inputs
and
minimize
the
use
of
unobservable
inputs.
When
multiple
inputs
are
used
to
derive
fair
value,
the
financial
instrument
is
assigned
to
the
level
within
the
fair
value
hierarchy
based
on
the
lowest-level
input
that
is
significant
to
the
fair
value
of
the
financial
instrument.
Input
levels
are
not
necessarily
an
indication
of
the
risk
or
liquidity
associated
with
financial
instruments
at
that
level
but
rather
the
degree
of
judgment
used
in
determining
those
values.
Valuation
Techniques
Equity
securities,
including
exchange-traded
funds, listed
or
regularly
traded
on
a
securities
exchange
or
in
the
over-the-counter
(OTC)
market
are
valued
at
the
last
quoted
sale
price
or,
for
certain
markets,
the
official
closing
price
at
the
time
the
valuations
are
made.
OTC
Bulletin
Board
securities
are
valued
at
the
mean
of
the
closing
bid
and
asked
prices.
A
security
that
is
listed
or
traded
on
more
than
one
exchange
is
valued
at
the
quotation
on
the
exchange
determined
to
be
the
primary
market
for
such
security.
Listed
securities
not
traded
on
a
particular
day
are
valued
at
the
mean
of
the
closing
bid
and
asked
prices
for
domestic
securities.
Investments
in
mutual
funds
are
valued
at
the
mutual
fund’s
closing
NAV
per
share
on
the
day
of
valuation.
Investments
for
which
market
quotations
or
market-based
valuations
are
not
readily
available
or
deemed
unreliable
are
valued
at
fair
value
as
determined
in
good
faith
by
the
Valuation
Committee,
in
accordance
with
fair
valuation
policies
and
procedures.
The
objective
of
any
fair
value
pricing
determination
is
to
arrive
at
a
price
that
could
reasonably
be
expected
from
a
current
sale.
Financial
instruments
fair
valued
by
the
Valuation
Committee
are
primarily
private
placements,
restricted
securities,
warrants,
rights,
and
other
securities
that
are
not
publicly
traded.
Factors
used
in
determining
fair
value
vary
by
type
of
investment
and
may
include
market
or
investment
specific
considerations.
The
Valuation
Committee
typically
will
afford
greatest
weight
to
actual
prices
in
arm’s
length
transactions,
to
the
extent
they
represent
orderly
transactions
between
market
participants,
transaction
information
can
be
reliably
obtained,
and
prices
are
deemed
representative
of
fair
value.
However,
the
Valuation
Committee
may
also
consider
other
valuation
methods
such
as
market-based
valuation
multiples;
a
discount
or
premium
from
market
value
of
a
similar,
freely
traded
security
of
the
same
issuer;
discounted
cash
flows;
yield
to
maturity;
or
some
combination.
Fair
value
T.
ROWE
PRICE
Mid-Cap
Index
Fund
21
determinations
are
reviewed
on
a
regular
basis
and
updated
as
information
becomes
available,
including
actual
purchase
and
sale
transactions
of
the
investment.
Because
any
fair
value
determination
involves
a
significant
amount
of
judgment,
there
is
a
degree
of
subjectivity
inherent
in
such
pricing
decisions,
and
fair
value
prices
determined
by
the
Valuation
Committee
could
differ
from
those
of
other
market
participants.
Valuation
Inputs
On
March
31,
2022,
all
of
the
fund’s
financial
instruments
were
classified
as
Level
1,
based
on
the
inputs
used
to
determine
their
fair
values.
OTHER
MATTERS
Unpredictable
events
such
as
environmental
or
natural
disasters,
war,
terrorism,
pandemics,
outbreaks
of
infectious
diseases,
and
similar
public
health
threats
may
significantly
affect
the
economy
and
the
markets
and
issuers
in
which
a
fund
invests.
Certain
events
may
cause
instability
across
global
markets,
including
reduced
liquidity
and
disruptions
in
trading
markets,
while
some
events
may
affect
certain
geographic
regions,
countries,
sectors,
and
industries
more
significantly
than
others,
and
exacerbate
other
pre-existing
political,
social,
and
economic
risks.
Since
2020,
a
novel
strain
of
coronavirus
(COVID-19)
has
resulted
in
disruptions
to
global
business
activity
and
caused
significant
volatility
and
declines
in
global
financial
markets.
In
February
2022,
Russian
forces
entered
Ukraine
and
commenced
an
armed
conflict.
Economic
sanctions
have
since
been
imposed
on
Russia
and
certain
of
its
citizens,
including
the
exclusion
of
Russia
from
the
SWIFT
global
payments
network.
As
a
result, Russian-related
stocks
and
debt
have
since
suffered
significant
declines
in
value.
The
duration
of
the
coronavirus
outbreak
and
the
Russian-Ukraine
conflict,
and
their
effects
on
the
financial
markets,
cannot
be
determined
with
certainty.
The fund’s
performance
could
be
negatively
impacted
if
the
value
of
a
portfolio
holding
were
harmed
by
these
and
such
other
events.
Management
is
actively
monitoring
these
events.