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Holdings (Monthly) Guide ↗

MFS Blended Research Mid Cap Equity Fund

· MFS Series Trust X
Monthly Holdings $2.9B AUM 175 positions Period May 2026 Filed Jul 23, 2026 EDGAR ↗ ← All Funds
All 37 New 96 Added 27 Reduced 15 Exited · May 2026 vs Feb 2026
# Name Ticker Since Shares Shares Δ Value Val Δ% % Port Cat
1 Western Digital Corp. 958102105 Feb 2026 162,701 +107,857 $86.4M +463.4% 2.95% EC
2 Flex Ltd. N/A Feb 2026 520,069 -26,052 $78.4M +127.8% 2.67% EC
3 Valero Energy Corp. 91913Y100 Feb 2026 238,023 -1,128 $58.3M +19.1% 1.99% EC
4 Ciena Corp. 171779309 Feb 2026 96,080 +10,394 $55.7M +86.6% 1.90% EC
5 Viking Holdings Ltd. N/A Feb 2026 591,770 NEW $54.5M — 1.86% EC
6 Okta, Inc. 679295105 Feb 2026 433,850 +51,886 $53.5M +93.1% 1.82% EC
7 Northern Trust Corp. 665859104 Feb 2026 311,632 +26,291 $51.6M +26.3% 1.76% EC
8 Aramark 03852U106 Feb 2026 936,189 +78,979 $50.0M +39.3% 1.70% EC
9 Westinghouse Air Brake Technologies Corp. 929740108 Feb 2026 182,211 +15,372 $47.6M +8.1% 1.62% EC
10 Edison International 281020107 Feb 2026 666,924 +56,262 $46.6M +2.2% 1.59% EC
11 Popular, Inc. 733174700 Feb 2026 297,168 +25,069 $44.1M +19.8% 1.50% EC
12 Phillips 66 718546104 Feb 2026 246,223 -58,727 $43.3M -8.0% 1.48% EC
13 Humana, Inc. 444859102 Feb 2026 139,856 +1,142 $42.7M +61.6% 1.46% EC
14 PG&E Corp. 69331C108 Feb 2026 2,605,314 +219,793 $42.6M -6.1% 1.45% EC
15 Ameriprise Financial, Inc. 03076C106 Feb 2026 94,773 +7,994 $42.2M +3.5% 1.44% EC
16 Curtiss-Wright Corp. 231561101 Feb 2026 54,997 +4,641 $41.1M +16.6% 1.40% EC
17 TechnipFMC plc N/A Feb 2026 581,897 NEW $39.8M — 1.36% EC
18 Datadog, Inc. 23804L103 Feb 2026 160,055 -49,776 $39.6M +68.5% 1.35% EC
19 Illumina, Inc. 452327109 Feb 2026 234,067 +69,131 $38.1M +72.0% 1.30% EC
20 AGCO Corp. 001084102 Feb 2026 322,601 +27,214 $36.2M -10.2% 1.23% EC
21 Synchrony Financial 87165B103 Feb 2026 487,212 +41,104 $34.8M +12.9% 1.19% EC
22 Aptiv plc N/A Feb 2026 511,539 NEW $34.8M — 1.18% EC
23 BWX Technologies, Inc. 05605H100 Feb 2026 167,272 -4,813 $32.8M -7.6% 1.12% EC
24 Equitable Holdings, Inc. 29452E101 Feb 2026 789,086 +66,568 $32.6M +12.3% 1.11% EC
25 AMETEK, Inc. 031100100 Feb 2026 143,271 +71,919 $32.4M +89.6% 1.10% EC
26 Masco Corp. 574599106 Feb 2026 459,905 +38,799 $32.3M +7.1% 1.10% EC
27 Everest Group Ltd. N/A Feb 2026 99,258 NEW $32.2M — 1.10% EC
28 WP Carey, Inc. 92936U109 Feb 2026 429,379 +18,990 $32.0M +4.3% 1.09% EC
29 TKO Group Holdings, Inc. 87256C101 Feb 2026 153,705 +12,967 $31.5M +0.1% 1.07% EC
30 Envista Holdings Corp. 29415F104 Feb 2026 1,333,961 +112,537 $31.4M -11.9% 1.07% EC
31 Teradyne, Inc. 880770102 Feb 2026 81,807 +62,017 $30.6M +383.5% 1.04% EC
32 O'Reilly Automotive, Inc. 67103H107 Feb 2026 346,042 +29,193 $30.1M +1.1% 1.02% EC
33 Dollar General Corp. 256677105 Feb 2026 270,766 +22,844 $29.9M -22.7% 1.02% EC
34 Texas Capital Bancshares, Inc. 88224Q107 Feb 2026 297,624 -6,215 $29.6M +2.3% 1.01% EC
35 Mohawk Industries, Inc. 608190104 Feb 2026 273,158 +23,045 $29.3M -6.3% 1.00% EC
36 Dexcom, Inc. 252131107 Feb 2026 391,759 +229,638 $28.9M +142.7% 0.98% EC
37 Highwoods Properties, Inc. 431284108 Feb 2026 1,073,865 +90,594 $28.0M +26.7% 0.96% EC
38 IQVIA Holdings, Inc. 46266C105 Feb 2026 153,521 +12,952 $28.0M +11.3% 0.95% EC
39 Hartford Insurance Group, Inc. (The) 416515104 Feb 2026 218,091 +8,658 $27.7M -6.0% 0.94% EC
40 Leidos Holdings, Inc. 525327102 Feb 2026 214,777 +18,119 $27.4M -20.3% 0.94% EC
41 Textron, Inc. 883203101 Feb 2026 297,698 +25,116 $27.3M +1.6% 0.93% EC
42 Brunswick Corp. 117043109 Feb 2026 322,493 +129,740 $27.0M +76.0% 0.92% EC
43 RPM International, Inc. 749685103 Feb 2026 244,136 +3,608 $25.9M -5.7% 0.88% EC
44 Eastman Chemical Co. 277432100 Feb 2026 332,284 +28,033 $25.2M +9.7% 0.86% EC
45 MYR Group, Inc. 55405W104 Feb 2026 53,526 +20,095 $24.9M +175.8% 0.85% EC
46 Avient Corp. 05368V106 Feb 2026 682,378 +57,567 $24.2M -5.8% 0.82% EC
47 Amkor Technology, Inc. 031652100 Feb 2026 341,983 +10,567 $23.8M +50.1% 0.81% EC
48 Omnicom Group, Inc. 681919106 Feb 2026 320,467 +27,036 $23.3M -6.9% 0.79% EC
49 Incyte Corp. 45337C102 Feb 2026 240,499 +20,289 $23.3M +4.3% 0.79% EC
50 Roku, Inc. 77543R102 Feb 2026 175,977 +113,358 $22.9M +271.8% 0.78% EC
51 Portland General Electric Co. 736508847 Feb 2026 449,070 +173,943 $22.5M +51.6% 0.77% EC
52 Exelixis, Inc. 30161Q104 Feb 2026 442,427 +37,324 $22.3M +25.1% 0.76% EC
53 Biogen, Inc. 09062X103 Feb 2026 113,786 +19,270 $22.3M +23.0% 0.76% EC
54 McKesson Corp. 58155Q103 Feb 2026 29,237 -5,462 $21.7M -36.6% 0.74% EC
55 Verisk Analytics, Inc. 92345Y106 Feb 2026 119,371 +10,070 $20.9M -7.9% 0.71% EC
56 TriNet Group, Inc. 896288107 Feb 2026 447,398 +37,742 $20.4M +31.0% 0.70% EC
57 Ingredion, Inc. 457187102 Feb 2026 200,802 +24,374 $20.4M -1.7% 0.69% EC
58 Cousins Properties, Inc. 222795502 Feb 2026 759,581 +64,080 $20.4M +26.4% 0.69% EC
59 Voya Financial, Inc. 929089100 Feb 2026 250,062 -8,469 $20.3M +17.5% 0.69% EC
60 Ferguson Enterprises, Inc. 31488V107 Feb 2026 89,155 +7,522 $20.1M -5.4% 0.69% EC
61 Essential Properties Realty Trust, Inc. 29670E107 Feb 2026 654,957 +55,255 $20.0M -1.6% 0.68% EC
62 Universal Health Services, Inc. 913903100 Feb 2026 134,228 +11,324 $19.6M -22.6% 0.67% EC
63 Jones Lang LaSalle, Inc. 48020Q107 Feb 2026 69,002 +5,822 $19.5M -2.3% 0.66% EC
64 Zoom Communications, Inc. 98980L101 Feb 2026 189,528 -15,778 $19.3M +26.8% 0.66% EC
65 nVent Electric plc N/A Feb 2026 114,838 NEW $19.2M — 0.65% EC
66 Ross Stores, Inc. 778296103 May 2026 81,495 NEW $18.9M — 0.64% EC
67 Cirrus Logic, Inc. 172755100 Feb 2026 108,787 +9,179 $18.5M +31.5% 0.63% EC
68 Expand Energy Corp. 165167735 Feb 2026 194,855 +174,702 $18.1M +733.0% 0.62% EC
69 Raymond James Financial, Inc. 754730109 Feb 2026 125,961 +10,626 $18.1M +2.3% 0.62% EC
70 ROBLOX Corp. 771049103 Feb 2026 373,490 -68,338 $17.6M -41.9% 0.60% EC
71 CareTrust REIT, Inc. 14174T107 Feb 2026 414,666 -12,847 $16.9M -2.5% 0.58% EC
72 JB Hunt Transport Services, Inc. 445658107 Feb 2026 60,864 +5,135 $16.8M +29.3% 0.57% EC
73 Jacobs Solutions, Inc. 46982L108 Feb 2026 136,908 +28,176 $16.4M +9.5% 0.56% EC
74 Talen Energy Corp. 87422Q109 Feb 2026 41,282 +24,874 $16.0M +162.3% 0.54% EC
75 Etsy, Inc. 29786A106 Feb 2026 235,085 +19,832 $16.0M +35.2% 0.54% EC
76 Simon Property Group, Inc. 828806109 Feb 2026 75,104 +22,040 $15.4M +42.3% 0.52% EC
77 Monolithic Power Systems, Inc. 609839105 Feb 2026 9,743 -1,708 $15.3M +16.6% 0.52% EC
78 CBRE Group, Inc. 12504L109 Feb 2026 121,645 +43,940 $15.2M +32.6% 0.52% EC
79 Zebra Technologies Corp. 989207105 Feb 2026 60,595 +50,601 $14.8M +559.6% 0.50% EC
80 Texas Roadhouse, Inc. 882681109 Feb 2026 79,430 +6,701 $14.3M +7.9% 0.49% EC
81 Lamar Advertising Co. 512816109 Feb 2026 91,587 -46,009 $14.0M -26.3% 0.48% EC
82 Dropbox, Inc. 26210C104 Feb 2026 514,736 -23,343 $13.8M +2.9% 0.47% EC
83 SkyWest, Inc. 830879102 Feb 2026 158,624 +13,383 $13.6M -10.1% 0.46% EC
84 Albertsons Cos., Inc. 013091103 Feb 2026 849,436 +71,663 $13.3M -4.8% 0.45% EC
85 United Airlines Holdings, Inc. 910047109 Feb 2026 114,145 -62,541 $13.1M -30.2% 0.45% EC
86 Sandisk Corp. 80004C200 Feb 2026 7,702 -1,690 $13.1M +118.8% 0.44% EC
87 MFS Institutional Money Market Portfolio 55291X109 Feb 2026 12,926,160 -9,865,636 $12.9M -43.3% 0.44% STIV
88 GoDaddy, Inc. 380237107 Feb 2026 148,585 -338 $12.8M -1.7% 0.43% EC
89 Antero Resources Corp. 03674X106 Feb 2026 352,712 +238,646 $12.6M +200.3% 0.43% EC
90 Banc of California, Inc. 05990K106 Feb 2026 655,186 +97,712 $12.6M +22.3% 0.43% EC
91 Axis Capital Holdings Ltd. N/A Feb 2026 131,310 NEW $12.5M — 0.42% EC
92 Flowserve Corp. 34354P105 Feb 2026 162,618 +13,717 $12.3M -6.8% 0.42% EC
93 NRG Energy, Inc. 629377508 Feb 2026 91,341 -82,347 $12.2M -60.6% 0.42% EC
94 National Fuel Gas Co. 636180101 Feb 2026 156,606 -54,822 $12.1M -37.1% 0.41% EC
95 US Foods Holding Corp. 912008109 Feb 2026 146,198 -59,338 $12.0M -39.7% 0.41% EC
96 Constellium SE N/A Feb 2026 333,386 NEW $11.4M — 0.39% EC
97 Anglogold Ashanti plc N/A Feb 2026 117,377 NEW $11.4M — 0.39% EC
98 Lincoln National Corp. 534187109 Feb 2026 316,460 +43,206 $11.2M +19.2% 0.38% EC
99 Newell Brands, Inc. 651229106 Feb 2026 3,233,698 +272,805 $11.0M -18.4% 0.37% EC
100 Corebridge Financial, Inc. 21871X109 Feb 2026 388,444 -420,269 $10.5M -49.8% 0.36% EC
101 Albemarle Corp. 012653101 Feb 2026 58,785 +15,565 $10.4M +34.3% 0.35% EC
102 Atmos Energy Corp. 049560105 Feb 2026 58,780 +4,958 $9.9M -1.1% 0.34% EC
103 Polaris, Inc. 731068102 Feb 2026 138,608 +20,696 $9.8M +36.6% 0.33% EC
104 Vistra Corp. 92840M102 Feb 2026 56,292 +50,668 $9.0M +822.3% 0.31% EC
105 Pentair plc N/A Feb 2026 125,844 NEW $8.9M — 0.30% EC
106 M&T Bank Corp. 55261F104 Feb 2026 39,915 +3,368 $8.6M +8.8% 0.29% EC
107 Ameren Corp. 023608102 Feb 2026 75,505 +62,451 $8.2M +451.3% 0.28% EC
108 Tutor Perini Corp. 901109108 Feb 2026 110,681 +9,337 $7.9M +3.6% 0.27% EC
109 Advanced Energy Industries, Inc. 007973100 Feb 2026 25,971 +12,386 $7.8M +72.2% 0.27% EC
110 Align Technology, Inc. 016255101 Feb 2026 44,827 -4,593 $7.8M -16.5% 0.27% EC
111 Versigent plc N/A Feb 2026 177,389 NEW $7.8M — 0.27% EC
112 Allegion plc N/A Feb 2026 58,444 NEW $7.6M — 0.26% EC
113 Bath & Body Works, Inc. 070830104 Feb 2026 362,451 +30,577 $7.3M -3.9% 0.25% EC
114 Corning, Inc. 219350105 May 2026 39,658 NEW $7.2M — 0.24% EC
115 Centene Corp. 15135B101 May 2026 119,255 NEW $7.1M — 0.24% EC
116 Hilton Worldwide Holdings, Inc. 43300A203 May 2026 21,512 NEW $7.0M — 0.24% EC
117 Chord Energy Corp. 674215207 May 2026 52,067 NEW $6.9M — 0.23% EC
118 Pegasystems, Inc. 705573103 Feb 2026 183,280 +15,463 $6.5M -10.8% 0.22% EC
119 State Street Corp. 857477103 May 2026 36,005 NEW $5.6M — 0.19% EC
120 MongoDB, Inc. 60937P106 Feb 2026 15,730 +1,327 $5.3M +11.6% 0.18% EC
121 Ford Motor Co. 345370860 Feb 2026 299,894 +25,299 $5.2M +35.2% 0.18% EC
122 Garrett Motion, Inc. 366505105 Feb 2026 154,587 +13,042 $5.1M +75.7% 0.17% EC
123 Sylvamo Corp. 871332102 Feb 2026 126,443 +10,667 $5.0M -7.4% 0.17% EC
124 Grand Canyon Education, Inc. 38526M106 Feb 2026 29,318 +2,473 $4.4M +2.9% 0.15% EC
125 Guidewire Software, Inc. 40171V100 Feb 2026 27,372 -54,013 $4.2M -64.7% 0.14% EC
126 Arxis, Inc. 04339D105 May 2026 92,393 NEW $4.2M — 0.14% EC
127 Permian Resources Corp. 71424F105 May 2026 212,597 NEW $4.1M — 0.14% EC
128 Carnival Corp. Ltd. N/A Feb 2026 143,095 NEW $4.0M — 0.14% EC
129 Constellation Brands, Inc. 21036P108 May 2026 27,908 NEW $3.9M — 0.13% EC
130 Visteon Corp. 92839U206 Feb 2026 31,637 -9,570 $3.7M -5.1% 0.13% EC
131 Q2 Holdings, Inc. 74736L109 Feb 2026 78,035 +6,583 $3.7M +7.5% 0.13% EC
132 Wolverine World Wide, Inc. 978097103 Feb 2026 199,367 +16,819 $3.5M +8.5% 0.12% EC
133 Hanover Insurance Group, Inc. (The) 410867105 Feb 2026 18,665 +1,573 $3.5M +12.6% 0.12% EC
134 NNN REIT, Inc. 637417106 Feb 2026 76,983 +6,494 $3.4M +7.3% 0.12% EC
135 Chewy, Inc. 16679L109 Feb 2026 144,951 +12,229 $3.3M -10.2% 0.11% EC
136 New York Times Co. (The) 650111107 May 2026 42,569 NEW $3.2M — 0.11% EC
137 Beacon Financial Corp. 084680107 May 2026 107,807 NEW $3.1M — 0.11% EC
138 Indivior Pharmaceuticals, Inc. 45579U109 Feb 2026 86,562 +29,310 $3.1M +66.4% 0.11% EC
139 Waters Corp. 941848103 May 2026 7,610 NEW $2.9M — 0.10% EC
140 Millicom International Cellular SA N/A Feb 2026 33,728 NEW $2.9M — 0.10% EC
141 Box, Inc. 10316T104 Feb 2026 99,065 +8,357 $2.7M +25.0% 0.09% EC
142 ACI Worldwide, Inc. 004498101 Feb 2026 58,247 -37,415 $2.5M -33.0% 0.09% EC
143 Assurant, Inc. 04621X108 Feb 2026 9,000 +759 $2.2M +18.4% 0.08% EC
144 Primoris Services Corp. 74164F103 May 2026 17,019 NEW $2.1M — 0.07% EC
145 TD SYNNEX Corp. 87162W100 May 2026 8,108 NEW $2.1M — 0.07% EC
146 BILL Holdings, Inc. 090043100 Feb 2026 54,900 +4,631 $2.0M -9.2% 0.07% EC
147 SM Energy Co. 78454L100 May 2026 61,935 NEW $1.9M — 0.06% EC
148 California Resources Corp. 13057Q305 May 2026 29,175 NEW $1.7M — 0.06% EC
149 EnerSys 29275Y102 May 2026 7,434 NEW $1.7M — 0.06% EC
150 CH Robinson Worldwide, Inc. 12541W209 Feb 2026 9,450 -39,521 $1.7M -81.4% 0.06% EC
151 Timken Co. (The) 887389104 May 2026 12,989 NEW $1.7M — 0.06% EC
152 Crane Co. 224408104 Feb 2026 8,760 +739 $1.6M -0.3% 0.05% EC
153 Terex Corp. 880779103 May 2026 27,042 NEW $1.6M — 0.05% EC
154 UMB Financial Corp. 902788108 May 2026 11,141 NEW $1.5M — 0.05% EC
155 Evergy, Inc. 30034W106 May 2026 17,013 NEW $1.4M — 0.05% EC
156 Simpson Manufacturing Co., Inc. 829073105 May 2026 7,333 NEW $1.4M — 0.05% EC
157 Hexcel Corp. 428291108 May 2026 15,283 NEW $1.4M — 0.05% EC
158 Advanced Drainage Systems, Inc. 00790R104 May 2026 9,450 NEW $1.3M — 0.04% EC
159 UFP Industries, Inc. 90278Q108 Feb 2026 15,087 +1,274 $1.2M -14.0% 0.04% EC
160 TPG, Inc. 872657101 Feb 2026 21,516 +1,816 $916K +7.1% 0.03% EC
✕ Builders FirstSource, Inc. 12008R107 — 196,889 SOLD $20.5M — — —
✕ AES Corp. (The) 00130H105 — 1,155,979 SOLD $20.0M — — —
✕ Carnival Corp. 143658300 — 566,680 SOLD $17.9M — — —
✕ Veeva Systems, Inc. 922475108 — 58,358 SOLD $10.6M — — —
✕ Amphenol Corp. 032095101 — 60,912 SOLD $8.9M — — —
✕ Tapestry, Inc. 876030107 — 52,072 SOLD $8.1M — — —
✕ General Mills, Inc. 370334104 — 127,357 SOLD $5.8M — — —
✕ Organon & Co. 68622V106 — 750,657 SOLD $5.5M — — —
✕ Stanley Black & Decker, Inc. 854502101 — 57,463 SOLD $5.0M — — —
✕ VeriSign, Inc. 92343E102 — 18,785 SOLD $4.3M — — —
✕ Fluor Corp. 343412102 — 64,317 SOLD $3.4M — — —
✕ VF Corp. 918204108 — 144,491 SOLD $2.8M — — —
✕ Trimble, Inc. 896239100 — 30,458 SOLD $2.0M — — —
✕ NewMarket Corp. 651587107 — 3,094 SOLD $1.9M — — —
✕ Covista, Inc. 00737L103 — 7,283 SOLD $0.7M — — —