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

About Mackay Shields LLC

Investment Activity

  • Mackay Shields LLC has $2.99 billion in total holdings as of March 31, 2026.
  • Mackay Shields LLC owns shares of 108 different stocks, but just 53 companies or ETFs make up 80% of its holdings.
  • Approximately 15.88% of the portfolio was purchased this quarter.
  • About 21.22% of the portfolio was sold this quarter.
  • This quarter, Mackay Shields LLC has purchased 111 new stocks and bought additional shares in 16 stocks.
  • Mackay Shields LLC sold shares of 59 stocks and completely divested from 16 stocks this quarter.

Largest Holdings

WESTERN DIGITAL CORP
$150,816,792
ALPHABET INC
$122,643,950
MKS INC.
$107,477,663
LUMENTUM HLDGS INC
$84,112,403
LANTHEUS HLDGS INC
$74,003,121

Largest New Holdings this Quarter

02079K404 - ALPHABET INC
$122,643,950 Holding
589889AB0 - MERIT MED SYS INC
$41,080,767 Holding
76155XAA8 - REVOLUTION MEDICINES INC
$38,069,140 Holding
472145AH4 - JAZZ INVESTMENTS I LTD
$34,657,429 Holding
23248VAD7 - CYBERARK SOFTWARE LTD
$31,616,914 Holding

Largest Purchases this Quarter

ALPHABET INC
2,427,303 shares (about $122.64M)
MERIT MED SYS INC
38,073,000 shares (about $41.08M)
REVOLUTION MEDICINES INC
30,344,000 shares (about $38.07M)
JAZZ INVESTMENTS I LTD
20,318,000 shares (about $34.66M)
CYBERARK SOFTWARE LTD
19,004,000 shares (about $31.62M)

Largest Sales this Quarter

WESTERN DIGITAL CORP
6,524,000 shares (about $109.91M)
ADVANCED ENERGY INDS
34,801,000 shares (about $95.04M)
LUMENTUM HLDGS INC
13,902,000 shares (about $90.76M)
MIRUM PHARMACEUTICALS INC
21,107,000 shares (about $78.04M)
ON SEMICONDUCTOR CORP
17,222,000 shares (about $31.36M)

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
WESTERN DIGITAL CORP
$150,816,792$109,911,612 ▼-42.2%8,952,0005.1%NOTE 3.000%11/1
ALPHABET INC
$122,643,950$122,643,950 ▲New Holding2,427,3034.1%DEP SHS RP1/20 A
MKS INC.
$107,477,663$117,881 ▼-0.1%36,470,0003.6%NOTE 1.250% 6/0
LUMENTUM HLDGS INC
$84,112,403$90,758,354 ▼-51.9%12,884,0002.8%NOTE 0.500% 6/1
LANTHEUS HLDGS INC
$74,003,121$50,923 ▼-0.1%50,863,0002.5%NOTE 2.625%12/1
HEWLETT PACKARD ENTERPRISE C
$70,210,944$69,246 ▼-0.1%601,2632.4%7.625 MAND CONV
CABLE ONE INC
$58,775,896$8,192,453 ▲16.2%89,888,0002.0%NOTE 1.125% 3/1
QXO INC
$57,413,691$42,858 ▼-0.1%1,169,4881.9%5.50 DEP PFD
BOEING CO
$56,171,414$50,161 ▼-0.1%828,6741.9%DEP CONV PFD A
TETRA TECH INC NEW
$55,268,887$2,184,620 ▼-3.8%52,445,0001.9%DBCV 2.250% 8/1
UBER TECHNOLOGIES INC
$54,331,944$14,372 ▲0.0%45,364,0001.8%NOTE 0.875%12/0
SNOWFLAKE INC
$54,155,943$48,263 ▼-0.1%32,541,0001.8%NOTE 10/0
CHEFS WHSE INC
$53,041,671$87,247 ▼-0.2%23,710,0001.8%NOTE 2.375%12/1
ETSY INC
$50,886,574$17,493,981 ▲52.4%49,886,0001.7%NOTE 0.125%10/0
NEXTERA ENERGY INC
$50,463,149$25,099,591 ▲99.0%940,9501.7%UNIT 06/01/2027
PG&E CORP
$47,525,062$70,592 ▲0.1%46,453,0001.6%NOTE 4.250%12/0
MICROCHIP TECHNOLOGY INC.
$46,450,746$188,115 ▲0.4%603,4911.6%DEP SHS REPSTG
Blackrock Municipal 2030 Target Term Trust stock logo
BTT
Blackrock Municipal 2030 Target Term Trust
$44,771,545$9,139,085 ▲25.6%1,967,9801.5%Finance
INTEGER HLDGS CORP
$43,942,264$81,585 ▲0.2%45,243,0001.5%DBCV 1.875% 3/1
APOLLO GLOBAL MGMT INC
$43,457,785$39,975 ▼-0.1%713,1531.5%SER A MAND CNV
LIBERTY MEDIA CORP DEL
$42,050,710$96,771 ▼-0.2%33,894,0001.4%NOTE 2.250% 8/1
POST HLDGS INC
$41,655,230$69,493 ▼-0.2%40,161,0001.4%NOTE 2.500% 8/1
MERIT MED SYS INC
$41,080,767$41,080,767 ▲New Holding38,073,0001.4%NOTE 3.000% 2/0
AKAMAI TECHNOLOGIES INC
$40,843,389$246,088 ▲0.6%34,024,0001.4%NOTE 0.375% 9/0
ON SEMICONDUCTOR CORP
$39,963,727$31,357,023 ▼-44.0%21,949,0001.3%NOTE 5/0
NINE ENERGY SERVICE INC
$39,180,461$713,846 ▼-1.8%3,011,5651.3%COMMON STOCK
DATADOG INC
$39,071,712$9,062,336 ▼-18.8%27,438,0001.3%NOTE 12/0
REVOLUTION MEDICINES INC
$38,069,140$38,069,140 ▲New Holding30,344,0001.3%NOTE 0.500% 5/0
FRESHPET INC
$36,956,373$10,459 ▲0.0%31,800,0001.2%NOTE 3.000% 4/0
BRIDGEBIO PHARMA INC
$36,917,577$62,160 ▼-0.2%33,259,0001.2%NOTE 2.250% 2/0
IRHYTHM HOLDINGS INC
$35,896,303$36,339 ▼-0.1%32,598,0001.2%NOTE 1.500% 9/0
LIVE NATION ENTERTAINMENT IN
$35,565,4520.0%29,737,0001.2%NOTE 2.875% 1/1
PELOTON INTERACTIVE INC
$34,867,996$3,376,676 ▲10.7%21,499,0001.2%NOTE 5.500%12/0
FLUOR CORP
$34,699,438$192,281 ▼-0.6%26,167,0001.2%NOTE 1.125% 8/1
JAZZ INVESTMENTS I LTD
$34,657,429$34,657,429 ▲New Holding20,318,0001.2%NOTE 3.125% 9/1
NORTHERN OIL & GAS INC
$31,899,375$52,780 ▼-0.2%33,241,0001.1%NOTE 3.625% 4/1
AFFIRM HLDGS INC
$31,704,730$43,266 ▼-0.1%27,113,0001.1%NOTE 0.750%12/1
CYBERARK SOFTWARE LTD
$31,616,914$31,616,914 ▲New Holding19,004,0001.1%NOTE 6/1
CLOUDFLARE INC
$31,512,824$31,512,824 ▲New Holding24,872,0001.1%NOTE 6/1
UNITY SOFTWARE INC
$30,459,761$2,264 ▲0.0%26,904,0001.0%NOTE 3/1
ORACLE CORP
$29,118,755$47,118 ▼-0.2%645,8011.0%6.5 DEP CUM SR D
MERITAGE HOMES CORP
$28,997,541$97,241 ▼-0.3%28,031,0001.0%NOTE 1.750% 5/1
PATRICK INDS INC
$28,330,050$26,673 ▼-0.1%19,118,0000.9%NOTE 1.750%12/0
LIBERTY MEDIA CORP DEL
$28,083,8990.0%24,458,0000.9%NOTE 3.750% 3/1
BURLINGTON STORES INC
$27,985,049$4,550,025 ▼-14.0%17,529,0000.9%NOTE 1.250%12/1
PROGRESS SOFTWARE CORP
$27,466,838$98,954 ▼-0.4%28,590,0000.9%NOTE 3.500% 3/0
BANK OF AMER CORP
$26,133,216$76,619 ▼-0.3%20,8060.9%7.25%CNV PFD L
PARSONS CORP DEL
$25,808,512$33,534 ▲0.1%26,167,0000.9%NOTE 2.625% 3/0
BIOMARIN PHARMACEUTICAL INC
$25,738,211$66,210 ▼-0.3%26,434,0000.9%NOTE 1.250% 5/1
iShares Gold Trust stock logo
IAU
iShares Gold Trust
$24,768,790$4,691,436 ▼-15.9%328,0200.8%ETF
DROPBOX INC
$24,614,8760.0%24,323,0000.8%NOTE 3/0
ARROWHEAD PHARMACEUTICALS IN
$24,483,945$20,893,397 ▲581.9%20,457,0000.8%NOTE 1/1
DOORDASH INC
$24,370,238$24,370,238 ▲New Holding24,710,0000.8%NOTE 5/1
SYNAPTICS INC
$24,040,1730.0%16,169,0000.8%NOTE 0.750%12/0
GUIDEWIRE SOFTWARE INC
$23,976,838$227,150 ▼-0.9%24,911,0000.8%NOTE 1.250%11/0
BlackRock MuniYield New York Quality Fund, Inc. stock logo
MYN
BlackRock MuniYield New York Quality Fund
$23,849,3230.0%2,349,6870.8%Finance
BlackRock MuniHoldings Fund, Inc. stock logo
MHD
BlackRock MuniHoldings Fund
$23,590,0250.0%1,982,3550.8%Finance
RIVIAN AUTOMOTIVE INC
$22,057,291$8,310 ▼0.0%18,580,0000.7%NOTE 4.625% 3/1
GREENBRIER COS INC
$21,770,7050.0%19,032,0000.7%NOTE 2.875% 4/1
DEXCOM INC
$20,922,195$7,051,848 ▼-25.2%22,415,0000.7%NOTE 0.375% 5/1
UPSTART HLDGS INC
$20,632,9870.0%25,168,0000.7%NOTE 1.000%11/1
BlackRock MuniYield Quality Fund, Inc. stock logo
MQY
BlackRock MuniYield Quality Fund
$18,490,6210.0%1,594,0190.6%Finance
SHIFT4 PMTS INC
$18,294,935$358,125 ▼-1.9%19,157,0000.6%NOTE 0.500% 8/0
ARES MANAGEMENT CORPORATION
$18,111,249$11,288 ▼-0.1%479,7350.6%6.75 SE B PFD
ALNYLAM PHARMACEUTICALS INC
$17,866,207$12,044 ▼-0.1%14,834,0000.6%NOTE 1.000% 9/1
WELLS FARGO & CO
$17,114,375$13,925 ▼-0.1%14,7480.6%PERP PFD CNV A
GULFPORT ENERGY CORP
$16,547,786$183,276 ▼-1.1%97,5120.6%COMMON SHARES
NUTANIX INC
$16,339,716$12,902,112 ▼-44.1%16,565,0000.5%NOTE 0.500%12/1
WORKIVA INC
$15,544,291$248,371 ▼-1.6%16,585,0000.5%NOTE 1.250% 8/1
RUBRIK INC.
$15,173,388$15,173,388 ▲New Holding14,825,0000.5%NOTE 6/1
Talos Energy Inc. stock logo
TALO
Talos Energy
$15,026,053$2,132,590 ▼-12.4%1,163,9080.5%Energy
MGP INGREDIENTS INC NEW
$13,859,418$42,815 ▼-0.3%14,243,0000.5%NOTE 1.875%11/1
ADVANCED ENERGY INDS
$13,226,484$95,043,335 ▼-87.8%4,843,0000.4%NOTE 2.500% 9/1
BILL HOLDINGS INC
$13,083,6180.0%15,102,0000.4%NOTE 4/0
ALPHABET INC
$12,597,500$12,597,500 ▲New Holding250,0000.4%DEP SHS RP1/20 B
GLOBAL PMTS INC
$11,591,1000.0%12,879,0000.4%NOTE 1.500% 3/0
NEXTERA ENERGY INC
$10,973,610$10,973,610 ▲New Holding228,9030.4%UNIT 02/15/2029
BlackRock MuniHoldings New Jersey Quality Fund, Inc. stock logo
MUJ
BlackRock MuniHoldings New Jersey Quality Fund
$10,856,829$3,274,214 ▼-23.2%881,9520.4%Finance
Warner Bros. Discovery, Inc. stock logo
WBD
Warner Bros. Discovery
$9,545,880$3,514,055 ▲58.3%358,0600.3%Communication Services
LIFE360 INC
$9,169,363$9,169,363 ▲New Holding8,870,0000.3%NOTE 6/0
GUARDANT HEALTH INC
$8,928,130$8,928,130 ▲New Holding7,179,0000.3%NOTE 11/1
LIVE NATION ENTERTAINMENT IN
$8,330,294$89,075 ▼-1.1%4,676,0000.3%NOTE 3.125% 1/1
SPECTRUM BRANDS INC
$8,208,2080.0%7,857,0000.3%NOTE 3.375% 6/0
VERTEX INC
$8,188,752$29,527 ▼-0.4%9,152,0000.3%NOTE 0.750% 5/0
TELADOC HEALTH INC
$7,313,6230.0%7,505,0000.2%NOTE 1.250% 6/0
CLOUDFLARE INC
$7,242,981$55,251 ▼-0.8%5,637,0000.2%NOTE 8/1
MIRUM PHARMACEUTICALS INC
$7,199,153$78,044,439 ▼-91.6%1,947,0000.2%NOTE 4.000% 5/0
WEC ENERGY GROUP INC
$6,396,106$128,864 ▼-2.0%5,162,0000.2%NOTE 4.375% 6/0
SOUTHERN CO
$6,134,334$78,208 ▼-1.3%5,569,0000.2%NOTE 4.500% 6/1
HALOZYME THERAPEUTICS INC
$6,007,958$10,000 ▼-0.2%5,407,0000.2%NOTE 0.250% 3/0
OSI SYSTEMS INC
$5,979,843$53,332 ▼-0.9%4,485,0000.2%NOTE 2.250% 8/0
BlackRock MuniYield Michigan Quality Fund, Inc. stock logo
MIY
BlackRock MuniYield Michigan Quality Fund
$5,886,496$2,199,054 ▼-27.2%479,7470.2%Finance
SPDR Gold Shares stock logo
GLD
SPDR Gold Shares
$5,649,4760.0%15,3360.2%ETF
FIVE9 INC
$5,475,796$97,862 ▼-1.8%6,155,0000.2%NOTE 1.000% 3/1
NUTANIX INC
$5,163,914$24,794 ▼-0.5%4,582,0000.2%NOTE 0.250%10/0
BlackRock MuniYield Quality Fund III, Inc. stock logo
MYI
BlackRock MuniYield Quality Fund III
$4,877,335$969,370 ▼-16.6%439,0040.2%Finance
SOUTHERN CO
$4,870,689$4,870,689 ▲New Holding4,815,0000.2%NOTE 3.250% 6/1
INTEGER HLDGS CORP
$4,572,930$108,358 ▼-2.3%3,756,0000.2%NOTE 2.125% 2/1
abrdn National Municipal Income Fund stock logo
VFL
abrdn National Municipal Income Fund
$4,165,5770.0%401,6950.1%Finance
IONIS PHARMACEUTICALS INC
$3,752,378$12,429,169 ▼-76.8%2,414,0000.1%NOTE 1.750% 6/1

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