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Mackay Shields LLC Top Holdings and 13F Report (2026)

About Mackay Shields LLC

Investment Activity

  • Mackay Shields LLC has $2.73 billion in total holdings as of March 31, 2026.
  • Mackay Shields LLC owns shares of 111 different stocks, but just 53 companies or ETFs make up 80% of its holdings.
  • Approximately 8.42% of the portfolio was purchased this quarter.
  • About 19.30% of the portfolio was sold this quarter.
  • This quarter, Mackay Shields LLC has purchased 132 new stocks and bought additional shares in 27 stocks.
  • Mackay Shields LLC sold shares of 55 stocks and completely divested from 28 stocks this quarter.

Largest Holdings

LUMENTUM HLDGS INC
$143,553,199
WESTERN DIGITAL CORP
$110,830,313
ADVANCED ENERGY INDS
$95,383,178
MIRUM PHARMACEUTICALS INC
$68,958,198
QXO INC
$65,257,945

Largest New Holdings this Quarter

45826HAD1 - INTEGER HLDGS CORP
$43,284,902 Holding
68389X204 - ORACLE CORP
$29,719,538 Holding
91332UAH4 - UNITY SOFTWARE INC
$26,841,871 Holding
70614WAD2 - PELOTON INTERACTIVE INC
$26,005,440 Holding
65441V200 - NINE ENERGY SERVICE INC
$25,144,758 Holding

Largest Purchases this Quarter

INTEGER HLDGS CORP
45,159,000 shares (about $43.28M)
ORACLE CORP
646,846 shares (about $29.72M)
UNITY SOFTWARE INC
26,902,000 shares (about $26.84M)
PELOTON INTERACTIVE INC
19,417,000 shares (about $26.01M)
NINE ENERGY SERVICE INC
3,066,434 shares (about $25.14M)

Largest Sales this Quarter

SEAGATE HDD CAYMAN
6,655,000 shares (about $31.62M)
Talos Energy
1,679,338 shares (about $26.47M)
WESTERN DIGITAL CORP
3,406,000 shares (about $24.39M)
SHIFT4 PMTS INC
19,960,000 shares (about $18.79M)
LUMENTUM HLDGS INC
2,596,000 shares (about $18.35M)

Sector Allocation Over Time

Map of 500 Largest Holdings ofMackay Shields LLC

 
 
Selling
 
 
Neutral
 
 
Buying
Issuer NameHoldings ValueApproximate Purchase/SaleChange in SharesShares Held% of PortfolioSector
LUMENTUM HLDGS INC
$143,553,199$17,422,962 ▼-10.8%26,786,0005.3%NOTE 0.500% 6/1
WESTERN DIGITAL CORP
$110,830,313$24,391,835 ▼-18.0%15,476,0004.1%NOTE 3.000%11/1
ADVANCED ENERGY INDS
$95,383,178$12,015,528 ▼-11.2%39,644,0003.5%NOTE 2.500% 9/1
MIRUM PHARMACEUTICALS INC
$68,958,198$7,412,094 ▼-9.7%23,054,0002.5%NOTE 4.000% 5/0
QXO INC
$65,257,945$44,496 ▼-0.1%1,170,3612.4%5.50 DEP PFD
LANTHEUS HLDGS INC
$61,196,398$6,992,775 ▼-10.3%50,898,0002.2%NOTE 2.625%12/1
MKS INC.
$60,398,440$62,863 ▼-0.1%36,510,0002.2%NOTE 1.250% 6/0
CABLE ONE INC
$58,367,366$6,005,820 ▲11.5%77,359,0002.1%NOTE 1.125% 3/1
TETRA TECH INC NEW
$57,176,031$5,353,895 ▼-8.6%54,518,0002.1%DBCV 2.250% 8/1
UBER TECHNOLOGIES INC
$54,602,805$3,260,372 ▲6.4%45,352,0002.0%NOTE 0.875%12/0
BOEING CO
$53,888,370$44,376 ▼-0.1%829,4142.0%DEP CONV PFD A
ON SEMICONDUCTOR CORP
$50,596,799$269,963 ▼-0.5%39,171,0001.9%NOTE 5/0
PG&E CORP
$48,059,496$5,250,032 ▼-9.8%46,384,0001.8%NOTE 4.250%12/0
POST HLDGS INC
$43,617,687$10,068,456 ▼-18.8%40,228,0001.6%NOTE 2.500% 8/1
INTEGER HLDGS CORP
$43,284,902$43,284,902 ▲New Holding45,159,0001.6%DBCV 1.875% 3/1
APOLLO GLOBAL MGMT INC
$41,972,244$28,401 ▼-0.1%713,8091.5%SER A MAND CNV
LIBERTY MEDIA CORP DEL
$39,259,692$73,962 ▼-0.2%33,972,0001.4%NOTE 2.250% 8/1
AKAMAI TECHNOLOGIES INC
$39,249,674$46,423 ▼-0.1%33,819,0001.4%NOTE 0.375% 9/0
HEWLETT PACKARD ENTERPRISE C
$39,017,575$258,861 ▲0.7%601,8561.4%7.625 MAND CONV
SNOWFLAKE INC
$38,519,136$3,213,279 ▲9.1%32,570,0001.4%NOTE 10/0
NCL CORP LTD
$37,977,0620.0%38,891,0001.4%NOTE 1.125% 2/1
BRIDGEBIO PHARMA INC
$37,363,518$5,200,499 ▲16.2%33,315,0001.4%NOTE 2.250% 2/0
NORTHERN OIL & GAS INC
$36,612,868$3,599,048 ▲10.9%33,296,0001.3%NOTE 3.625% 4/1
FRESHPET INC
$36,577,109$12,016,336 ▲48.9%31,791,0001.3%NOTE 3.000% 4/0
IRHYTHM HOLDINGS INC
$35,753,016$55,879 ▼-0.2%32,631,0001.3%NOTE 1.500% 9/0
Blackrock Municipal 2030 Target Term Trust stock logo
BTT
Blackrock Municipal 2030 Target Term Trust
$35,554,147$4,588,464 ▲14.8%1,566,2621.3%Financial Services
CHEFS WHSE INC
$35,100,896$51,730 ▼-0.1%23,749,0001.3%NOTE 2.375%12/1
iShares Gold Trust stock logo
IAU
iShares Gold Trust
$34,395,624$7,480,376 ▼-17.9%390,1501.3%Finance
MICROCHIP TECHNOLOGY INC.
$34,317,119$24,380 ▼-0.1%601,0471.3%DEP SHS REPSTG
BURLINGTON STORES INC
$33,727,2450.0%20,379,0001.2%NOTE 1.250%12/1
PATRICK INDS INC
$33,200,623$3,490,785 ▼-9.5%19,136,0001.2%NOTE 1.750%12/0
DATADOG INC
$32,796,3900.0%33,802,0001.2%NOTE 12/0
FLUOR CORP
$32,483,988$17,284 ▲0.1%26,312,0001.2%NOTE 1.125% 8/1
LIVE NATION ENTERTAINMENT IN
$32,115,960$56,160 ▲0.2%29,737,0001.2%NOTE 2.875% 1/1
ETSY INC
$32,002,036$4,212,389 ▼-11.6%32,736,0001.2%NOTE 0.125%10/0
SEAGATE HDD CAYMAN
$31,536,807$31,617,573 ▼-50.1%6,638,0001.2%NOTE 3.500% 6/0
ORACLE CORP
$29,719,538$29,719,538 ▲New Holding646,8461.1%6.5 DEP CUM SR D
DEXCOM INC
$27,631,980$6,401,363 ▼-18.8%29,970,0001.0%NOTE 0.375% 5/1
MERITAGE HOMES CORP
$27,195,970$7,972,650 ▼-22.7%28,125,0001.0%NOTE 1.750% 5/1
UNITY SOFTWARE INC
$26,841,871$26,841,871 ▲New Holding26,902,0001.0%NOTE 3/1
NUTANIX INC
$26,814,055$31,658 ▲0.1%29,645,0001.0%NOTE 0.500%12/1
NEXTERA ENERGY INC
$26,667,570$540,810 ▲2.1%472,9361.0%UNIT 06/01/2027
PELOTON INTERACTIVE INC
$26,005,440$26,005,440 ▲New Holding19,417,0001.0%NOTE 5.500%12/0
PARSONS CORP DEL
$25,780,2050.0%26,133,0000.9%NOTE 2.625% 3/0
BIOMARIN PHARMACEUTICAL INC
$25,563,296$7,864,220 ▼-23.5%26,502,0000.9%NOTE 1.250% 5/1
PROGRESS SOFTWARE CORP
$25,556,214$45,425 ▲0.2%28,693,0000.9%NOTE 3.500% 3/0
LIBERTY MEDIA CORP DEL
$25,477,319$5,330,258 ▼-17.3%24,458,0000.9%NOTE 3.750% 3/1
AFFIRM HLDGS INC
$25,467,276$2,711,819 ▲11.9%27,150,0000.9%NOTE 0.750%12/1
NINE ENERGY SERVICE INC
$25,144,758$25,144,758 ▲New Holding3,066,4340.9%COMMON STOCK
GUIDEWIRE SOFTWARE INC
$25,099,8500.0%25,147,0000.9%NOTE 1.250%11/0
BANK AMERICA CORP
$24,884,836$71,553 ▼-0.3%20,8670.9%7.25%CNV PFD L
DROPBOX INC
$23,119,0120.0%24,323,0000.8%NOTE 3/0
BlackRock MuniYield New York Quality Fund, Inc. stock logo
MYN
BlackRock MuniYield New York Quality Fund
$22,556,995$11,284,953 ▲100.1%2,349,6870.8%Finance
BlackRock MuniHoldings Fund, Inc. stock logo
MHD
BlackRock MuniHoldings Fund
$22,360,965$2,074,561 ▼-8.5%1,982,3550.8%Financial Services
GREENBRIER COS INC
$22,046,6690.0%19,032,0000.8%NOTE 2.875% 4/1
Talos Energy Inc. stock logo
TALO
Talos Energy
$20,946,569$26,466,367 ▼-55.8%1,329,0970.8%Energy
GULFPORT ENERGY CORP
$20,859,109$2,115,700 ▼-9.2%98,5920.8%COMMON SHARES
RIVIAN AUTOMOTIVE INC
$19,937,965$6,436 ▲0.0%18,587,0000.7%NOTE 4.625% 3/1
ALNYLAM PHARMACEUTICALS INC
$19,053,164$7,701 ▲0.0%14,844,0000.7%NOTE 1.000% 9/1
SHIFT4 PMTS INC
$18,384,496$18,787,351 ▼-50.5%19,532,0000.7%NOTE 0.500% 8/0
UPSTART HLDGS INC
$17,929,1240.0%25,168,0000.7%NOTE 1.000%11/1
ARES MANAGEMENT CORPORATION
$17,810,582$259,311 ▲1.5%480,0340.7%6.75 SE B PFD
BlackRock MuniYield Quality Fund, Inc. stock logo
MQY
BlackRock MuniYield Quality Fund
$17,502,329$13,573,279 ▲345.5%1,594,0190.6%Finance
WFC.PL
Wells Fargo & Co. Pfd. Series L
$17,127,153$11,604 ▼-0.1%14,7600.6%Finance
SYNAPTICS INC
$16,763,2110.0%16,169,0000.6%NOTE 0.750%12/0
JAZZ INVESTMENTS I LTD
$15,907,2490.0%13,087,0000.6%NOTE 2.000% 6/1
WORKIVA INC
$15,817,9380.0%16,850,0000.6%NOTE 1.250% 8/1
IONIS PHARMACEUTICALS INC
$15,706,0870.0%10,410,0000.6%NOTE 1.750% 6/1
LUMENTUM HLDGS INC
$15,551,800$18,351,124 ▼-54.1%2,200,0000.6%NOTE 0.500%12/1
CHEESECAKE FACTORY INC
$15,177,582$62,139 ▼-0.4%15,388,0000.6%NOTE 0.375% 6/1
MGP INGREDIENTS INC NEW
$13,763,534$62,618 ▲0.5%14,287,0000.5%NOTE 1.875%11/1
BILL HOLDINGS INC
$13,467,2090.0%15,102,0000.5%NOTE 4/0
BlackRock MuniHoldings New Jersey Quality Fund, Inc. stock logo
MUJ
BlackRock MuniHoldings New Jersey Quality Fund
$13,281,574$982,767 ▼-6.9%1,147,9320.5%Finance
Q2 HLDGS INC
$13,226,538$12,198,770 ▼-48.0%13,281,0000.5%NOTE 0.750% 6/0
AEROVIRONMENT INC
$12,961,296$2,951,097 ▲29.5%13,220,0000.5%NOTE 7/1
GLOBAL PMTS INC
$11,372,815$4,185,662 ▼-26.9%12,879,0000.4%NOTE 1.500% 3/0
VERTEX INC
$7,995,543$7,780,529 ▼-49.3%9,185,0000.3%NOTE 0.750% 5/0
SPECTRUM BRANDS INC
$7,861,3220.0%7,857,0000.3%NOTE 3.375% 6/0
BlackRock MuniYield Michigan Quality Fund, Inc. stock logo
MIY
BlackRock MuniYield Michigan Quality Fund
$7,828,551$69,498 ▼-0.9%658,9690.3%Finance
TELADOC HEALTH INC
$7,197,295$7,373,751 ▼-50.6%7,505,0000.3%NOTE 1.250% 6/0
LIVE NATION ENTERTAINMENT IN
$7,178,794$95,697 ▼-1.3%4,726,0000.3%NOTE 3.125% 1/1
OSI SYSTEMS INC
$6,930,211$4,595 ▲0.1%4,525,0000.3%NOTE 2.250% 8/0
CLOUDFLARE INC
$6,648,780$40,970 ▼-0.6%5,680,0000.2%NOTE 8/1
SPDR Gold Shares stock logo
GLD
SPDR Gold Shares
$6,598,9270.0%15,3360.2%Finance
WEC ENERGY GROUP INC
$6,514,430$84,121 ▼-1.3%5,266,0000.2%NOTE 4.375% 6/0
NEUBERGER MUN FD INC
$6,326,262$6,194,556 ▼-49.5%623,2770.2%COM
SOUTHERN CO
$6,264,936$46,654 ▲0.8%5,640,0000.2%NOTE 4.500% 6/1
Warner Bros. Discovery, Inc. stock logo
WBD
Warner Bros. Discovery
$6,212,8250.0%226,2500.2%Consumer Discretionary
HALOZYME THERAPEUTICS INC
$5,615,982$183,536 ▲3.4%5,416,0000.2%NOTE 0.250% 3/0
BlackRock MuniYield Quality Fund III, Inc. stock logo
MYI
BlackRock MuniYield Quality Fund III
$5,530,951$5,530,951 ▲New Holding526,2560.2%Finance
FIVE9 INC
$5,466,213$5,706,151 ▼-51.1%6,265,0000.2%NOTE 1.000% 3/1
Nuveen New York AMT-Free Quality Municipal Income Fund stock logo
NRK
Nuveen New York AMT-Free Quality Municipal Income Fund
$5,307,974$1,237,707 ▼-18.9%519,8800.2%Financial Services
NUTANIX INC
$4,688,713$71,288 ▲1.5%4,604,0000.2%NOTE 0.250%10/0
INTEGER HLDGS CORP
$4,541,170$140,546 ▲3.2%3,845,0000.2%NOTE 2.125% 2/1
abrdn National Municipal Income Fund stock logo
VFL
abrdn National Municipal Income Fund
$4,000,8820.0%401,6950.1%Finance
ARROWHEAD PHARMACEUTICALS IN
$3,111,300$3,111,300 ▲New Holding3,000,0000.1%NOTE 1/1
Inv Vk Tr Inv stock logo
VGM
Inv Vk Tr Inv
$2,064,479$980,841 ▼-32.2%209,1670.1%Finance
Inv Vk Mun Tr stock logo
VKQ
Inv Vk Mun Tr
$1,987,909$1,107,109 ▼-35.8%208,8140.1%Finance
Mfs Muni Inc Tr stock logo
MFM
Mfs Muni Inc Tr
$1,795,705$35,046 ▼-1.9%333,1550.1%Finance
BlackRock MuniHoldings California Quality Fund, Inc. stock logo
MUC
BlackRock MuniHoldings California Quality Fund
$1,527,136$8,678,654 ▼-85.0%146,8400.1%Finance

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