Fund Holdings As of 6/30/2021 MassMutual Core Bond Fund Barings Prior to 5/1/2021, the Fund name was MassMutual Premier Core Bond Fund. Fund Weighting Security Name % Position Market Value USTREAS T-Bill Auction Ave 3 Mon 12.74 195,233,310 Us 2yr Note (Cbt) Sep21 Xcbt 20210930 10.04 153,783,578 Us Ultra Bond Cbt Sep21 Xcbt 20210921 3.37 51,640,250 Federal National Mortgage Association 3% 2.80 42,905,303 United States Treasury Bonds 3.5% 2.11 32,271,048 United States Treasury Bonds 2.25% 1.58 24,149,075 Federal National Mortgage Association 2% 1.39 21,330,781 Government National Mortgage Association 3.5% 1.29 19,783,269 United States Treasury Notes 0.5% 1.14 17,538,543 Us 5yr Note (Cbt) Sep21 Xcbt 20210930 1.12 17,156,727 Federal National Mortgage Association 2% 1.06 16,297,232 Federal National Mortgage Association 3.5% 1.06 16,265,953 BGME TRUST 2021-VR 2.99% 1.06 16,166,916 United States Treasury Notes 0.12% 0.97 14,904,792 Fnma Pass-Thru I 3.5% 0.76 11,608,875 Federal Home Loan Mortgage Corporation 2% 0.73 11,214,546 Federal Home Loan Mortgage Corporation 3.5% 0.67 10,299,581 Government National Mortgage Association 3% 0.67 10,215,474 Government National Mortgage Association 3% 0.66 10,043,755 Government National Mortgage Association 3% 0.58 8,946,807 Government National Mortgage Association 2.5% 0.49 7,454,812 AT&T Inc 3.55% 0.44 6,810,636 JBS Finance Luxembourg S A R L 3.62% 0.43 6,547,970 Federal National Mortgage Association 3.5% 0.40 6,109,087 Government National Mortgage Association 3.5% 0.39 5,908,132 Government National Mortgage Association 3% 0.37 5,686,578 Anheuser-Busch Companies LLC / Anheuser-Busch InBev Worldwide Inc 4.9% 0.36 5,584,457 The Allstate Corporation 5.75% 0.35 5,411,088 Federal Home Loan Mortgage Corporation 2% 0.35 5,337,279 STARWOOD MORTGAGE RESIDENTIAL TRUST 2.36% 0.35 5,291,708 Federal National Mortgage Association 4% 0.34 5,220,031 MHC COMMERCIAL MORTGAGE TRUST 2021-MHC 2.17% 0.34 5,146,429 Sammons Financial Group Inc 3.35% 0.33 5,131,180 EXTENDED STAY AMERICA TRUST 1% 0.33 5,120,709 SANTANDER DRIVE AUTO RECEIVABLES TRUST 1.35% 0.33 5,005,103 Athene Holding Ltd 6.15% 0.32 4,935,500 VASA TRUST 2021-VASA 2.17% 0.32 4,880,463 Sallie Mae Pfd 144A 1% 0.31 4,811,340 American International Group, Inc. 5.75% 0.31 4,787,944 Sixth Street Specialty Lending Inc 3.88% 0.31 4,782,157 The Boeing Company 1.43% 0.31 4,760,780 BENCHMARK MORTGAGE TRUST 2.85% 0.31 4,721,807 Wave 2019-1 LLC/LTD 3.6% 0.30 4,625,519 Blackrock Tcp Capital Corp 3.9% 0.29 4,482,578 ECMC GROUP STUDENT LOAN TRUST 0.89% 0.29 4,465,868 Morgan Stanley 4.35% 0.29 4,446,539 COLD STORAGE TRUST 2.17% 0.29 4,440,048 BUSINESS JET SECURITIES LLC 2.16% 0.29 4,402,587 Aventura Mall Trust 4.25% 0.29 4,376,639 AmTrust Financial Services Inc. 6.12% 0.29 4,369,914 SOFI ALTERNATIVE TRUST 4.56% 0.28 4,351,926 Fnma Pass-Thru I 4.5% 0.28 4,349,952 Trinity Rail Leasing 2019 Llc 3.82% 0.28 4,314,035 Antares Holdings LP 6% 0.28 4,261,743 Trinity Rail Leasing 2019 Llc 3.1% 0.28 4,261,284 Credit Suisse AG 6.5% 0.27 4,204,260 Aircastle Limited 4.4% 0.27 4,104,801 SLG OFFICE TRUST 2.85% 0.26 4,039,149 BP Capital Markets plc 4.38% 0.26 4,020,375 Prudential Financial, Inc. 5.7% 0.26 3,964,893 Brighthouse Financial Inc. 5.62% 0.25 3,905,788 VEREIT Operating Partnership L.P 3.1% 0.25 3,862,799 NELNET STUDENT LOAN TRUST 2019-4 1.74% 0.25 3,862,597 NMLT 2021-INV1 TRUST 2.71% 0.24 3,735,551 NAVIENT PRIVATE EDUCATION LOAN TRUST 4.04% 0.24 3,730,151 Thrust Engine Leasing 2021 Dac / Thrust Engine Leasing 2021 Statutory Trust 0.24 3,699,859 BGME TRUST 2021-VR 2.99% 0.24 3,698,574 Bank of Nova Scotia 4.65% 0.24 3,638,750 Mizrahi Tefahot Bank Limited 3.08% 0.24 3,620,850 Mplx Lp 6.88% 0.24 3,616,030 El Puerto de Liverpool S.A.B. de C.V. 3.95% 0.24 3,607,031 Global Atlantic Finance Company 1% 0.23 3,590,561 Colombia (Republic of) 6.12% 0.23 3,526,800 Elmwood Clo Ii Ltd / Llc 1.34% 0.23 3,503,150 Fund Weighting Security Name % Position Market Value NAVIENT PRIVATE EDUCATION REFI LOAN TRUST 2.52% 0.23 3,495,463 Discover Bank 4.68% 0.23 3,478,541 Weir Group 2.2% 0.22 3,430,442 SMB PRIVATE EDUCATION LOAN TRUST 2.76% 0.22 3,425,948 Horizon Aircraft Finance III Ltd/LLC 3.42% 0.22 3,415,218 DROP MORTGAGE TRUST 2.32% 0.22 3,375,520 GOODGREEN 2.76% 0.22 3,361,052 Avolon Holdings Funding Limited 4.25% 0.22 3,351,021 Mexico (United Mexican States) 4.75% 0.22 3,343,608 NEWREZ WAREHOUSE SECURITIZATION TRUST 2021-1 1.49% 0.22 3,339,999 CNO Financial Group, Inc. 5.25% 0.22 3,331,831 Nordea Bank ABP 6.62% 0.22 3,316,777 Hercules Capital Inc 4.62% 0.21 3,271,492 Triton Container International Limited 2.05% 0.21 3,236,636 B.A.T. Capital Corporation 4.7% 0.21 3,227,698 First Republic Bank San Francisco 4.38% 0.21 3,213,721 BENCHMARK MORTGAGE TRUST 2.85% 0.21 3,185,451 NAVIENT PRIVATE EDUCATION LOAN TRUST 2.95% 0.21 3,176,321 Viterra Finance B.V. 3.2% 0.21 3,168,012 JPMDB Commercial Mortgage Securities Trust 2017-C7 4.3% 0.20 3,129,009 Athene Global Funding 2015-1 2.67% 0.20 3,123,239 Federal National Mortgage Association 3% 0.20 3,113,722 Enlink Midstream Partners LP 4.15% 0.20 3,112,694 AXIS Specialty Finance PLC 4% 0.20 3,058,081 Us Long Bond(Cbt) Sep21 Xcbt 20210921 0.20 3,054,250 The Timken Company 4.5% 0.20 3,052,408 NAVIENT STUDENT LOAN TRUST 1.44% 0.20 3,043,038 HCA Inc. 3.5% 0.20 3,016,055 WELLS FARGO COMMERCIAL MORTGAGE TRUST 1.92% 0.20 3,007,507 BENCHMARK MORTGAGE TRUST 3.09% 0.20 2,990,260 JPMBB COMMERCIAL MORTGAGE SECURITIES TRUST 3.9% 0.19 2,985,277 BANK 2020-BNK30 3.02% 0.19 2,970,164 EQT Corporation 3.9% 0.19 2,967,362 Planet Fitness Incorporation 3.86% 0.19 2,965,928 Jackson Park Trust 2019-Lic 3.13% 0.19 2,932,512 Blackrock Tcp Capital Corp 4.12% 0.19 2,903,314 Host Hotels & Resorts, L.P. 3.5% 0.19 2,895,073 J.G. WENTWORTH XXXIV LLC 3.26% 0.19 2,873,908 Bpce Sa 1.65% 0.19 2,873,755 Enstar Finance Llc 5.75% 0.19 2,865,375 MANHATTAN WEST 2020-1MW MORTGAGE TRUST 2.41% 0.19 2,863,163 STARWOOD MORTGAGE RESIDENTIAL TRUST 2.49% 0.19 2,839,956 Glencore Funding LLC 4.62% 0.18 2,833,621 NELNET STUDENT LOAN TRUST 3.45% 0.18 2,809,110 Associated Banc-Corp 4.25% 0.18 2,807,409 BLUEMOUNTAIN CLO LTD 1.98% 0.18 2,750,000 Dupont De Nemours Inc 5.32% 0.18 2,734,230 Microsoft Corporation 2.92% 0.18 2,717,212 COLLEGE AVE STUDENT LOANS LLC 3.81% 0.18 2,706,524 Avnet, Inc. 3% 0.18 2,683,280 RenaissanceRe Finance Inc 3.45% 0.17 2,679,247 Enterprise Products Operating LP 5.25% 0.17 2,675,498 Spirit Realty LP 4% 0.17 2,667,393 Charter Communications Operating, LLC/Charter Communications Operating Capi 0.17 2,625,120 Apidos Clo 1.89% 0.17 2,610,133 Castlelake Aircraft Securitization 4.12% 0.17 2,598,278 LIFE 2021-BMR MORTGAGE TRUST 1.82% 0.17 2,556,967 Brookfield Finance Inc. 4.85% 0.17 2,554,953 Ares Finance Co LLC 4% 0.17 2,545,476 ONEMAIN DIRECT AUTO RECEIVABLES TRUST 3.95% 0.17 2,540,884 Syngenta Finance N.V. 4.44% 0.17 2,533,413 Blue Owl Finance Llc 3.12% 0.16 2,518,791 General Motors Company 6.8% 0.16 2,514,083 Nrz Advance Receivables Trust 2015-On1 5.47% 0.16 2,501,580 Slam 2021-1 Limited / Slam 2021-1 Llc 2.43% 0.16 2,500,296 Golub Cap Bdc Inc 3.38% 0.16 2,493,676 Bm1105923 Swaption Dec32 2.94 Put 0.16 2,480,518 Brookfield Finance Inc. 4.35% 0.16 2,478,718 STORE Capital Corp 4.62% 0.16 2,478,240 NAVIENT PRIVATE EDUCATION REFI LOAN TRUST 2.78% 0.16 2,470,510 Vivint Solar Fin V 2018 7.37% 0.16 2,469,213 THL CREDIT WIND RIVER 2018-3 CLO LTD 1.89% 0.16 2,440,112 Trinity Rail Leasing 2010 LLC 4.62% 0.16 2,439,409 EXTENDED STAY AMERICA TRUST 1% 0.16 2,417,243 Adams Outdoor Advertising LP 4.81% 0.16 2,415,730 BBCMS MORTGAGE TRUST 4.41% 0.16 2,385,762 Lazard Group LLC 4.5% 0.15 2,369,829 BX COMMERCIAL MORTGAGE TRUST 2.07% 0.15 2,367,843 Enstar Group Ltd 4.95% 0.15 2,355,992 Park Aerospace Holdings Limited 4.5% 0.15 2,338,620 Energy Transfer LP 6.25% 0.15 2,325,388 Fund Weighting Security Name % Position Market Value Navient Student Loan Trust 1.34% 0.15 2,316,873 BX COMMERCIAL MORTGAGE TRUST 1.9% 0.15 2,302,871 CARVANA AUTO RECEIVABLES TRUST 1.82% 0.15 2,298,858 Plains All American Pipeline L.P./PAA Finance Corp.