FundWatcher
MGRFX
MassMutual Mid Cap Growth Fund
MASSMUTUAL SELECT FUNDS

Portfolio moves

Net position changes between two of this fund's N-PORT snapshots. These are differences between point-in-time reports — not a trade log — and share counts can be affected by splits and other corporate actions.

Dec 31, 2025 → Mar 31, 2026

Expand a category to see the positions behind it, ranked by weight.

Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
FIXED INC CLEARING CORP.REPO 0 62,955,965 62,955,965 2.28% $62.96M
INSULET CORP 0 79,900 79,900 0.61% $16.77M
US FOODS HOLDING CORP 0 180,561 180,561 0.60% $16.65M
STRIDE INC 0 100,188 100,188 0.32% $8.83M
MURPHY USA INC 0 16,726 16,726 0.30% $8.26M
JABIL INC 0 25,192 25,192 0.24% $6.69M
DESCARTES SYS 0 90,674 90,674 0.23% $6.49M
APOGEE THERAPEUTICS INC 0 75,317 75,317 0.23% $6.34M
RAMBUS INC 0 69,700 69,700 0.22% $6.00M
WORKDAY INC CL A 0 45,537 45,537 0.21% $5.92M
DUTCH BROS INC-A 0 115,900 115,900 0.21% $5.87M
ACUITY INC 0 20,500 20,500 0.21% $5.74M
ENTEGRIS INC 0 47,494 47,494 0.20% $5.57M
DECKERS OUTDOOR CORP 0 50,668 50,668 0.18% $5.07M
SOLSTICE ADV MAT 0 63,960 63,960 0.18% $4.87M
CG ONCOLOGY INC 0 68,390 68,390 0.17% $4.63M
SKYWORKS SOLUTIONS INC 0 71,455 71,455 0.14% $3.83M
SYMBOTIC INC 0 70,643 70,643 0.14% $3.76M
KYMERA THERAPEUTICS INC 0 45,100 45,100 0.14% $3.76M
SYNAPTICS INC 0 49,190 49,190 0.12% $3.45M
LEMONADE INC 0 54,654 54,654 0.12% $3.43M
MOTOROLA SOLUTIONS INC 0 7,692 7,692 0.12% $3.34M
T Rowe Price Government Reserve Investment Fund 0 388 388 0.00% $388
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
FIXED INC CLEARING CORP.REPO 81,613,457 0 -81,613,457 0.00% -$81.61M
CCC INTELLIGENT SOLUTIONS HOLD CL A 3,025,414 0 -3,025,414 0.00% -$24.05M
HOLOGIC INC 287,500 0 -287,500 0.00% -$21.42M
EXPAND ENERGY CORP 127,900 0 -127,900 0.00% -$14.12M
MOLINA HEALTHCARE INC 76,700 0 -76,700 0.00% -$13.31M
TOAST INC-A 342,600 0 -342,600 0.00% -$12.17M
COSTAR GROUP INC 169,900 0 -169,900 0.00% -$11.42M
ON HOLDING AG 213,895 0 -213,895 0.00% -$9.94M
MONDAY.COM LTD 59,600 0 -59,600 0.00% -$8.79M
HUBSPOT INC 20,900 0 -20,900 0.00% -$8.39M
ARCELLX INC 124,400 0 -124,400 0.00% -$8.11M
EPAM SYSTEMS INC 39,197 0 -39,197 0.00% -$8.03M
BRUKER CORP 148,648 0 -148,648 0.00% -$7.00M
DUOLINGO INC 37,000 0 -37,000 0.00% -$6.49M
CHARLES RIVER LABS INTL INC 31,373 0 -31,373 0.00% -$6.26M
MASIMO CORP 43,000 0 -43,000 0.00% -$5.59M
ONESTREAM INC 287,319 0 -287,319 0.00% -$5.28M
LAMB WESTON HOLDINGS INC 108,782 0 -108,782 0.00% -$4.56M
MATTEL INC 228,677 0 -228,677 0.00% -$4.54M
KKR & CO INC 27,207 0 -27,207 0.00% -$3.47M
TWILIO INC CLASS A 23,844 0 -23,844 0.00% -$3.39M
CORNING INC 38,000 0 -38,000 0.00% -$3.33M
APPLOVIN CORP 4,484 0 -4,484 0.00% -$3.02M
NETSKOPE INC-A 157,377 0 -157,377 0.00% -$2.76M
CDW CORPORATION 19,883 0 -19,883 0.00% -$2.71M
DOLBY LABORATORIES INC CL A 41,619 0 -41,619 0.00% -$2.67M
CORCEPT THERAPEUTICS INC 67,300 0 -67,300 0.00% -$2.34M
MAPLEBEAR INC 22,300 0 -22,300 0.00% -$1.00M
T. Rowe Price Treasury Reserve Fund 384 0 -384 0.00% -$384
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
CENCORA INC 110,500 131,835 21,335 1.50% $4.09M
ALNYLAM PHARMACEUTICALS INC 105,830 121,989 16,159 1.46% -$1.72M
VERALTO CORP 252,000 327,700 75,700 1.05% $3.83M
PLANET FITNESS INC CL A 340,500 364,301 23,801 0.98% -$9.84M
WEST PHARMACEUTICAL SVCS INC 53,700 97,700 44,000 0.89% $9.71M
UL SOLUTIONS INC CL A 209,483 264,118 54,635 0.82% $6.12M
NATERA INC 99,190 109,546 10,356 0.79% -$815.33K
POOL CORP 92,000 106,126 14,126 0.78% $427.47K
SERVICE CORP INTERNATIONAL INC 228,200 251,347 23,147 0.75% $2.95M
MANHATTAN ASSOCIATES INC 121,900 149,100 27,200 0.72% -$1.28M
ELANCO ANIMAL HEALTH INC 793,100 824,585 31,485 0.71% $1.78M
API GROUP CORP 253,182 465,456 212,274 0.68% $9.17M
PURE STORAGE INC CL A 305,230 308,330 3,100 0.66% -$2.25M
REDDIT INC-A 120,541 132,223 11,682 0.64% -$9.90M
AKAMAI TECHNOLOGIES INC 48,751 154,575 105,824 0.64% $13.50M
TRADEWEB MARKETS INC A 139,500 147,752 8,252 0.63% $2.38M
KNIGHT-SWIFT TRANSPORTATION HOLDINGS INC 278,456 283,485 5,029 0.59% $1.77M
RB GLOBAL INC 111,100 153,800 42,700 0.53% $3.31M
GUIDEWIRE SOFTWARE INC 12,785 89,364 76,579 0.48% $10.80M
ENCOMPASS HEALTH CORP 124,700 136,500 11,800 0.48% -$32.01K
STANDARDAERO INC 507,618 510,818 3,200 0.48% -$1.36M
EQUIFAX INC 53,500 70,226 16,726 0.46% $1.04M
CELSIUS HOLDINGS INC 295,101 345,871 50,770 0.44% -$1.23M
DT MIDSTREAM INC 27,100 88,534 61,434 0.43% $8.68M
DEXCOM INC 128,797 169,248 40,451 0.38% $2.08M
FAIR ISAAC CORP 8,395 9,729 1,334 0.38% -$3.81M
ROBLOX CORP - A 114,661 161,211 46,550 0.33% -$172.89K
Sportradar Holding AG 435,000 540,700 105,700 0.33% -$1.29M
State Street Navigator Securities Lending Government Money Market Portfolio 3,230,812 9,030,388 5,799,576 0.33% $5.80M
CIRCLE INTERNET GROUP INC A 37,067 90,926 53,859 0.31% $5.74M
MUELLER INDUSTRIES INC 69,691 77,635 7,944 0.31% $601.43K
ATLASSIAN CORP PLC CLS A 92,905 104,005 11,100 0.26% -$7.97M
ARISTA NETWORKS INC 26,027 53,623 27,596 0.24% $3.17M
LIVE NATION ENTERTAINMENT INC 37,500 40,292 2,792 0.22% $801.18K
BROADRIDGE FINL 31,700 33,300 1,600 0.20% -$1.66M
LULULEMON ATHLETICA INC 19,862 30,419 10,557 0.17% $529.63K
AURORA INNOVATION INC 750,022 890,623 140,601 0.13% $789.28K
CACI INTL-A 6,040 6,457 417 0.13% $293.60K
BULLISH 35,200 64,700 29,500 0.08% $978.71K
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
HILTON WORLDWIDE HOLDINGS INC 215,000 182,234 -32,766 2.00% -$6.35M
XPO LOGISTICS INC 343,681 278,637 -65,044 1.96% $7.50M
MONOLITHIC POWER SYS INC 59,118 48,041 -11,077 1.90% -$1.06M
LATTICE SEMICONDUCTOR CORP 772,591 543,762 -228,829 1.82% -$6.41M
AGILENT TECHNOLOGIES INC 445,326 434,387 -10,939 1.79% -$11.08M
METTLER-TOLEDO INTL INC 40,325 37,332 -2,993 1.70% -$9.14M
BURLINGTON STORES INC 174,121 143,581 -30,540 1.69% -$3.58M
VIKING HOLDINGS LTD 613,768 549,050 -64,718 1.46% -$3.48M
YUM! BRANDS INC 327,059 242,335 -84,724 1.36% -$11.80M
KEYSIGHT TECHNOLOGIES INC 155,000 131,442 -23,558 1.34% $5.62M
MSCI INC 73,996 68,521 -5,475 1.34% -$5.52M
PTC INC 299,706 257,993 -41,713 1.33% -$15.45M
DOMINOS PIZZA INC 111,005 100,799 -10,206 1.31% -$10.10M
TECHNIPFMC PLC 821,034 515,308 -305,726 1.29% -$962.03K
CHENIERE ENERGY INC 208,160 113,087 -95,073 1.16% -$8.37M
ASSURANT INC 175,800 141,904 -33,896 1.12% -$11.43M
TYLER TECHNOLOGIES INC 91,600 89,663 -1,937 1.11% -$10.88M
OLD DOMINION FRT 181,100 155,317 -25,783 1.10% $1.95M
LIBERTY MEDIA CORP LIBERTY FORMULA ONE CL C 422,924 353,735 -69,189 1.09% -$11.59M
DOLLAR TREE INC 329,000 268,129 -60,871 1.06% -$11.11M
MACOM TECHNOLOGY SOLUTIONS HOLDINGS INC 167,800 129,881 -37,919 1.04% $101.89K
VEEVA SYSTEMS-A 208,034 160,379 -47,655 1.02% -$18.27M
COOPER COS INC 444,300 393,256 -51,044 1.02% -$8.30M
NEW YORK TIMES CO CL A 419,900 335,199 -84,701 1.01% -$1.08M
MICROCHIP TECHNOLOGY 489,400 433,998 -55,402 1.01% -$3.14M
FERGUSON ENTERPRISES INC 134,500 119,039 -15,461 1.00% -$2.18M
QUANTA SVCS INC 57,389 50,187 -7,202 1.00% $3.33M
EQT CORPORATION 458,800 410,459 -48,341 0.94% $1.53M
ROYAL CARIBBEAN CRUISES LTD 93,550 90,469 -3,081 0.90% -$1.20M
MARTIN MAR MTLS 44,500 41,611 -2,889 0.89% -$3.21M
ESAB CORP 260,566 248,610 -11,956 0.87% -$5.08M
INGERSOLL RAND INC 347,600 296,171 -51,429 0.86% -$3.81M
CBOE GLOBAL MARKETS INC 89,700 80,286 -9,414 0.82% $51.29K
ULTA BEAUTY INC 48,003 42,528 -5,475 0.80% -$6.81M
ROSS STORES INC 150,229 102,067 -48,162 0.80% -$4.95M
RAYMOND JAMES FINANCIAL INC. 167,300 149,725 -17,575 0.78% -$5.19M
TRANSUNION 416,593 311,726 -104,867 0.78% -$14.15M
AVERY DENNISON CORP 138,000 123,533 -14,467 0.77% -$3.77M
MARVELL TECHNOLOGY INC 228,860 204,672 -24,188 0.73% $824.24K
TEXTRON INC 345,000 229,833 -115,167 0.73% -$9.95M
BOOZ ALLEN HAMILTON HLDG CL A 266,100 256,617 -9,483 0.72% -$2.42M
TELEFLEX INC 213,800 167,300 -46,500 0.72% -$6.08M
IONIS PHARMACEUTICALS INC 409,616 254,240 -155,376 0.69% -$13.31M
NXP SEMICONDUCTORS NV 124,066 95,944 -28,122 0.68% -$8.04M
FTAI AVIATION LTD 132,026 76,655 -55,371 0.68% -$7.21M
PAYLOCITY HOLDING CORP 182,625 172,218 -10,407 0.67% -$9.24M
LIBERTY LIVE HOLDINGS INC C 217,200 195,008 -22,192 0.66% $289.85K
Ascendis Pharma A/S 80,600 71,578 -9,022 0.59% -$815.11K
BALL CORP 310,000 272,242 -37,758 0.58% -$328.48K
ITT INC 92,500 80,000 -12,500 0.55% -$807.28K
TERADYNE INC 208,706 50,980 -157,726 0.55% -$25.28M
ZOOM VIDEO COMMUNICATIONS INC CL A 228,200 182,200 -46,000 0.53% -$5.04M
BIRKENSTOCK HOLDING LTD 464,958 406,801 -58,157 0.53% -$4.44M
MONGODB INC CL A 70,562 57,108 -13,454 0.51% -$15.64M
CASEY'S GENERAL 35,164 19,183 -15,981 0.50% -$5.47M
UNITED THERAPEUTICS CORP DEL 27,117 23,226 -3,891 0.50% $559.80K
MARKEL GROUP INC 7,700 6,900 -800 0.48% -$3.35M
MCCORMICK-N/V 302,000 255,900 -46,100 0.47% -$7.66M
CLOUDFLARE INC-A 71,372 61,448 -9,924 0.46% -$1.39M
WYNDHAM HOTELS and RESORTS INC 174,900 155,281 -19,619 0.46% -$601.97K
ZSCALER INC 123,231 85,125 -38,106 0.43% -$15.77M
BWX TECHNOLOGIES INC 98,754 56,400 -42,354 0.42% -$5.54M
VISTRA CORP 115,288 75,898 -39,390 0.41% -$7.19M
RBC BEARINGS INC 27,518 20,807 -6,711 0.41% -$1.04M
CYTOKINETICS INC 193,600 158,500 -35,100 0.38% -$1.85M
AMPHENOL CORPORATION CL A 293,070 80,112 -212,958 0.37% -$29.48M
L3HARRIS TECHNOLOGIES INC 33,090 28,343 -4,747 0.35% $68.36K
BUILDERS FIRSTSOURCE 136,703 111,597 -25,106 0.33% -$4.88M
INSMED INC 64,490 55,280 -9,210 0.33% -$2.18M
WINGSTOP INC 68,952 57,872 -11,080 0.32% -$7.48M
TEXAS ROADHOUSE INC 104,400 53,300 -51,100 0.32% -$8.53M
ALIGN TECHNOLOGY INC 147,918 51,155 -96,763 0.32% -$14.33M
BIOGEN INC 51,100 46,700 -4,400 0.31% -$431.58K
BIONTECH SE ADR 104,900 95,800 -9,100 0.31% -$1.47M
ROLLINS INC 175,198 159,166 -16,032 0.31% -$2.01M
VAXCYTE INC 184,071 140,371 -43,700 0.29% -$336.08K
TOPBUILD CORP 28,800 22,650 -6,150 0.29% -$4.06M
ATI INC 90,165 54,092 -36,073 0.28% -$2.48M
IDEXX LABS INC 19,325 13,913 -5,412 0.28% -$5.26M
EAGLE MATERIALS INC 50,076 36,000 -14,076 0.25% -$3.53M
CORPAY INC 49,445 23,345 -26,100 0.25% -$8.09M
PERMIAN RESOURCES CORP CL A 353,818 316,001 -37,817 0.24% $1.77M
CHURCH & DWIGHT 82,337 71,619 -10,718 0.24% -$220.47K
QXO INC 356,330 339,067 -17,263 0.24% -$288.92K
TRACTOR SUPPLY CO. 212,177 141,827 -70,350 0.23% -$4.19M
FORTIVE CORP 141,975 110,681 -31,294 0.22% -$1.72M
ROCKET LAB CORP 186,612 91,533 -95,079 0.21% -$7.14M
RYAN SPECIALTY HOLDINGS INC 183,678 173,241 -10,437 0.21% -$3.64M
RESMED INC 31,659 25,569 -6,090 0.21% -$1.89M
TPG INC 154,878 141,378 -13,500 0.21% -$4.16M
FIRST INDUSTRIAL REALTY TRUST 113,453 97,174 -16,279 0.20% -$875.94K
AVANTOR INC 1,570,600 705,000 -865,600 0.20% -$12.47M
CHIPOTLE MEXICAN GRILL INC 202,446 153,201 -49,245 0.18% -$2.59M
ALCON INC 173,138 63,587 -109,551 0.17% -$8.85M
STERIS PLC 25,283 21,657 -3,626 0.17% -$1.62M
UNITY SOFTWARE INC 387,319 217,287 -170,032 0.17% -$12.34M
KLA CORP 5,250 3,219 -2,031 0.17% -$1.64M
GE HEALTHCARE TECHNOLOGIES INC WI 76,606 65,615 -10,991 0.17% -$1.61M
CRISPR THERAPEUTICS AG 112,414 96,019 -16,395 0.17% -$1.33M
VERTIV HOLDINGS CO 21,110 18,083 -3,027 0.16% $1.11M
RALLIANT CORP 140,871 107,671 -33,200 0.16% -$2.69M
CARIS LIFE SCIENCES INC 278,764 249,038 -29,726 0.16% -$3.07M
AON PLC 24,847 13,701 -11,146 0.16% -$4.35M
WASTE CONNECTIONS INC 31,317 26,824 -4,493 0.16% -$1.13M
DATADOG INC CL A 68,605 36,670 -31,935 0.16% -$5.00M
DRAFTKINGS INC 777,793 199,700 -578,093 0.16% -$22.49M
SNOWFLAKE INC CL A 46,524 27,996 -18,528 0.15% -$5.98M
CINTAS CORP 28,077 24,050 -4,027 0.15% -$1.21M
MCGRAW HILL INC 322,481 288,506 -33,975 0.14% -$1.37M
ASTERA LABS INC 53,382 33,414 -19,968 0.13% -$5.22M
NASDAQ INC 70,035 41,856 -28,179 0.13% -$3.25M
ALLEGRO MICROSYSTEMS INC 223,633 103,594 -120,039 0.12% -$2.63M
BLOCK INC CL A 75,427 49,495 -25,932 0.11% -$1.93M
CARLYLE GROUP INC (THE) 131,145 60,809 -70,336 0.11% -$4.81M
TRADE DESK INC-A 210,327 126,425 -83,902 0.10% -$5.12M
FLOOR & DECOR-A 83,449 56,210 -27,239 0.10% -$2.23M
QUIDELORTHO CORP 266,600 172,000 -94,600 0.10% -$4.79M
REVOLUTION MEDICINES INC 86,100 25,000 -61,100 0.09% -$4.43M
Security Shares Dec 2025 Shares Mar 2026 Δ shares End % Δ value
NUVALENT INC-A 24,303 24,303 0 0.09% $45.20K

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