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Mackay Shields LLC

SEC CIK
0000061227
Latest filing
Jul 28, 2026

Holdings in Q4 2025

Holdings as of Dec 31, 2025, filed Jan 29, 2026. Long positions only; changes compare share counts with Q3 2025.

Institution overview
Positions
132
−4 vs. Q3 2025
Portfolio value
$2.86B
−$82.5M (−2.8%) vs. Q3 2025
Filed
Jan 29, 2026
SEC
Holdings of Mackay Shields LLC in Q4 2025
SecurityClassSharesValue% of portfolioShare changeActionHistory
Western Digital Corp958102AT2NOTE 3.000%11/1–$86.6M3.0%–––
Lumentum Hldgs Inc55024UAF6NOTE 0.500% 6/1–$85.3M3.0%–––
Advanced Energy Inds007973AE0NOTE 2.500% 9/1–$73.3M2.6%–––
Mirum Pharmaceuticals, Inc.604749AB7NOTE 4.000% 5/0–$66.0M2.3%–––
Lantheus Hldgs Inc516544AB9NOTE 2.625%12/1–$65.1M2.3%–––
QXO.PBQXO, Inc.5.50 DEP PFD1,171,159$65.0M2.3%−14,926−1.3%ReducedHistory
Tetra Tech Inc88162GAB9DBCV 2.250% 8/1–$64.8M2.3%–––
BA.PABoeing CoDEP CONV PFD A830,097$57.7M2.0%−11,884−1.4%ReducedHistory
Cable One, Inc.12685JAG0NOTE 1.125% 3/1–$56.7M2.0%–––
Uber Technologies, Inc90353TAM2NOTE 0.875%12/0–$55.4M1.9%–––
Apollo Global Mgmt Inc03769M304SER A MAND CNV714,292$53.9M1.9%−7,555−1.0%Reduced–
Post Hldgs Inc737446AT1NOTE 2.500% 8/1–$53.4M1.9%–––
PG&E Corp69331CAL2NOTE 4.250%12/0–$53.0M1.9%–––
On Semiconductor Corp682189AS4NOTE 5/0–$47.0M1.6%–––
MKS Inc55306NAB0NOTE 1.250% 6/0–$46.7M1.6%–––
iRhythm Holdings, Inc.450056AB2NOTE 1.500% 9/0–$45.7M1.6%–––
Seagate HDD Cayman81180WBL4NOTE 3.500% 6/0–$44.7M1.6%–––
Snowflake Inc.833445AB5NOTE 10/0–$44.4M1.6%–––
Liberty Media Corp531229AQ5NOTE 2.250% 8/1–$43.1M1.5%–––
HPE.PCHewlett Packard Enterprise Co7.625 MAND CONV597,863$39.6M1.4%−7,315−1.2%ReducedHistory
NCL Corp Ltd62886HBD2NOTE 1.125% 2/1–$38.9M1.4%–––
IAUiShares Gold TrustETF475,000$38.6M1.3%−50,000−9.5%ReducedHistory
SHIFT4 PMTS Inc82452JAD1NOTE 0.500% 8/0–$38.1M1.3%–––
Etsy Inc29786AAJ5NOTE 0.125%10/0–$37.5M1.3%–––
Chefs Whse Inc163086AE1NOTE 2.375%12/1–$36.2M1.3%–––
Patk703343AG812/01/2028–$36.0M1.3%–––
Meritage Homes CORP59001ABF8NOTE 1.750% 5/1–$35.9M1.3%–––
MCHPPMicrochip Technology IncDEP SHS REPSTG601,474$35.1M1.2%−7,689−1.3%ReducedHistory
Akamai Technologies Inc00971TAL5NOTE 0.375% 9/0–$34.0M1.2%–––
Dexcom Inc252131AM9NOTE 0.375% 5/1–$34.0M1.2%–––
Datadog, Inc.23804LAD5NOTE 12/0–$33.8M1.2%–New–
Biomarin Pharmaceutical Inc09061GAK7NOTE 1.250% 5/1–$33.3M1.2%–––
TALOTalos Energy Inc.COM3,008,435$33.2M1.2%−90,000−2.9%ReducedHistory
BridgeBio Pharma, Inc.10806XAD4NOTE 2.250% 2/0–$32.3M1.1%–––
Ford MTR Co Del345370CZ1NOTE 3/1–$31.3M1.1%–––
Live Nation Entertainment IN538034BC2NOTE 2.875% 1/1–$31.3M1.1%–New–
BTTBlackRock Municipal 2030 Target Term TrustCOM SHS BEN IN1,364,127$31.1M1.1%−55,767−3.9%ReducedHistory
Tyler Tex Indpt SCH Dist902252AB1NOTE 0.250% 3/1–$30.7M1.1%–––
Burlington Stores, Inc.122017AD8NOTE 1.250%12/1–$30.3M1.1%–––
Fluor Corp343412AJ1NOTE 1.125% 8/1–$30.0M1.1%–––
Liberty Media Corp531229AP7NOTE 3.750% 3/1–$29.8M1.0%–––
Progress Software Corp743312AD2NOTE 3.500% 3/0–$29.0M1.0%–––
Northern Oil & Gas, Inc.665531AJ8NOTE 3.625% 4/1–$29.0M1.0%–––
Nutanix, Inc.67059NAK4NOTE 0.500%12/1–$28.6M1.0%–New–
Guidewire Software, Inc.40171VAC4NOTE 1.250%11/0–$27.7M1.0%–New–
Parsons Corp70202LAD4NOTE 2.625% 3/0–$26.9M0.9%–––
Affirm Hldgs Inc00827BAD8NOTE 0.750%12/1–$26.9M0.9%–New–
Bank of Amer Corp0605056827.25%CNV PFD L20,927$26.2M0.9%+3,343+19.0%Added–
Q2 Hldgs Inc74736LAD1NOTE 0.750% 6/0–$25.9M0.9%–––
MHDBlackRock Muniholdings Fund, Inc.COM2,166,270$25.4M0.9%00.0%UnchangedHistory
Freshpet, Inc.358039AB1NOTE 3.000% 4/0–$25.0M0.9%–––
Cable One, Inc.12685JAE5NOTE 3/1–$24.7M0.9%–––
Dropbox, Inc.26210CAD6NOTE 3/0–$24.6M0.9%–––
NEE.PSNextera Energy IncUNIT 06/01/2027463,345$24.0M0.8%−2,126−0.5%ReducedHistory
ARES.PBAres Management Corp6.75 SE B PFD473,045$23.9M0.8%−7,860−1.6%ReducedHistory
Rivian Automotive, Inc.76954AAB9NOTE 4.625% 3/1–$23.4M0.8%–––
GPORGulfport Energy CorpCOMMON SHARES108,592$22.6M0.8%−22,364−17.1%ReducedHistory
Upstart Hldgs Inc91680MAF4NOTE 1.000%11/1–$22.1M0.8%–New–
Alnylam Pharmaceuticals, Inc.02043QAB3NOTE 1.000% 9/1–$21.8M0.8%–––
Greenbrier Cos Inc393657AM3NOTE 2.875% 4/1–$20.5M0.7%–––
WFC.PLWells Fargo & CompanyPERP PFD CNV A14,770$18.0M0.6%−634−4.1%ReducedHistory
Lumentum Hldgs Inc55024UAD1NOTE 0.500%12/1–$17.8M0.6%–––
Vertex, Inc.92538JAB2NOTE 0.750% 5/0–$17.2M0.6%–––
SYNAPTICS Inc87157DAJ8NOTE 0.750%12/0–$17.1M0.6%–New–
Workiva Inc98139AAD7NOTE 1.250% 8/1–$16.7M0.6%–––
Ionis Pharmaceuticals Inc462222AF7NOTE 1.750% 6/1–$16.6M0.6%–––
Impinj Inc453204AD1NOTE 1.125% 5/1–$16.1M0.6%–––
Global PMTS Inc37940XAU6NOTE 1.500% 3/0–$15.8M0.6%–––
Cheesecake Factory Inc163072AA9NOTE 0.375% 6/1–$15.3M0.5%–––
Jazz Investments I Ltd472145AF8NOTE 2.000% 6/1–$15.2M0.5%–––
MUJBlackRock Muniholdings New Jersey Quality Fund, Inc.COM1,232,873$14.7M0.5%00.0%UnchangedHistory
Teladoc Health, Inc.87918AAF2NOTE 1.250% 6/0–$14.5M0.5%–––
BILL Holdings, Inc.090043AF7NOTE 4/0–$13.9M0.5%–New–
MGP Ingredients Inc55303JAB2NOTE 1.875%11/1–$13.8M0.5%–––
NBHNeuberger Municipal Fund Inc.COM1,233,578$12.5M0.4%00.0%UnchangedHistory
MHNBlackRock Muniholdings New York Quality Fund, Inc.COM1,191,469$12.2M0.4%00.0%UnchangedHistory
Rapid7, Inc.753422AH7NOTE 1.250% 3/1–$11.7M0.4%–––
MYNBlackRock Muniyield New York Quality Fund, Inc.COM1,174,171$11.6M0.4%00.0%UnchangedHistory
Five9, Inc.338307AF8NOTE 1.000% 3/1–$11.6M0.4%–––
AeroVironment Inc008073AA6NOTE 7/1–$11.1M0.4%–––
MUCBlackRock Muniholdings California Quality Fund, Inc.CEF981,326$10.4M0.4%00.0%UnchangedHistory
MQTBlackRock Muniyield Quality Fund II, Inc.COM1,008,573$10.1M0.4%−18,232−1.8%ReducedHistory
Haemonetics Corp Mass405024AB6NOTE 3/0–$8.41M0.3%–––
BFKBlackRock Municipal Income TrustSH BEN INT833,784$8.36M0.3%00.0%UnchangedHistory
MVFBlackRock Munivest Fund, Inc.COM1,192,311$8.26M0.3%−31,554−2.6%ReducedHistory
Amphastar Pharmaceuticals IN03209RAB9NOTE 2.000% 3/1–$8.10M0.3%–––
MIYBlackRock Muniyield Michigan Quality Fund, Inc.COM664,819$7.80M0.3%00.0%UnchangedHistory
Spectrum Brands Inc84762LAZ8NOTE 3.375% 6/0–$7.45M0.3%–––
MYDBlackRock Muniyield Fund, Inc.COM697,362$7.32M0.3%−14,761−2.1%ReducedHistory
Live Nation Entertainment IN538034BA6NOTE 3.125% 1/1–$6.96M0.2%–––
Expedia Group, Inc.30212PBE4NOTE 2/1–$6.86M0.2%–––
Cloudflare, Inc.18915MAC1NOTE 8/1–$6.71M0.2%–––
Osi Systems Inc671044AF2NOTE 2.250% 8/0–$6.71M0.2%–––
CONMED Corp207410AH4NOTE 2.250% 6/1–$6.69M0.2%–––
WBDWarner Bros. Discovery, Inc.Stock226,250$6.52M0.2%−173,750−43.4%ReducedHistory
NRKNuveen New York Amt-Free Quality Municipal Income FundCOM641,105$6.47M0.2%−156,530−19.6%ReducedHistory
Wec Energy Group, Inc.92939UAR7NOTE 4.375% 6/0–$6.22M0.2%–––
GLDSPDR Gold TrustETF15,336$6.08M0.2%00.0%UnchangedHistory
Southern Co842587DZ7NOTE 4.500% 6/1–$5.97M0.2%–––
Halozyme Therapeutics, Inc.40637HAD1NOTE 0.250% 3/0–$5.65M0.2%–––

Sold out since Q3 2025 (14)

Positions held at the end of Q3 2025 that are gone from this filing.

Positions of Mackay Shields LLC sold out since Q3 2025
SecurityClassShares in Q3 2025Value in Q3 2025% of portfolio in Q3 2025History
Lumentum Hldgs Inc55024UAH2NOTE 1.500%12/1–$21.9M0.7%–
NEANuveen AMT-Free Quality Municipal Income FundCOM1,801,320$20.5M0.7%History
NVGNuveen AMT-Free Municipal Credit Income FundCEF1,165,469$14.3M0.5%History
NADNuveen Quality Municipal Income FundCOM1,058,093$12.4M0.4%History
NACNuveen California Quality Municipal Income FundCOM511,343$5.88M0.2%History
SHIFT4 PMTS Inc82452JAB5NOTE 12/1–$4.90M0.2%–
Pebblebrook Hotel Tr70509VAA8NOTE 1.750%12/1–$4.85M0.2%–
VODVodafone Group Public Ltd CoADR371,152$4.31M0.1%History
ENXEaton Vance New York Municipal Bond FundCOM421,971$4.16M0.1%History
Exact Sciences Corp30063PAC9NOTE 0.375% 3/0–$3.73M0.1%–
IQIInvesco Quality Municipal Income TrustCOM94,994$935.7K<0.1%History
Southern Co842587DP9NOTE 3.875%12/1–$738.0K<0.1%–
Bill Com Hldgs Inc090043AB6NOTE 12/0–$73.8K<0.1%–
NINENine Energy Service, Inc.COM116,342$73.5K<0.1%History