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

Selling

Neutral

Buying

Latest 13F Holdings and Changes Since Previous Quarterly Filing

Issuer Name	Holdings Value	Approximate Purchase/Sale	Change in Shares	Shares Held	% of Portfolio	Sector
WESTERN DIGITAL CORP	$150,816,792	$109,911,612 â–¼	-42.2%	8,952,000	5.1%	NOTE 3.000%11/1
ALPHABET INC	$122,643,950	$122,643,950 â–²	New Holding	2,427,303	4.1%	DEP SHS RP1/20 A
MKS INC.	$107,477,663	$117,881 â–¼	-0.1%	36,470,000	3.6%	NOTE 1.250% 6/0
LUMENTUM HLDGS INC	$84,112,403	$90,758,354 â–¼	-51.9%	12,884,000	2.8%	NOTE 0.500% 6/1
LANTHEUS HLDGS INC	$74,003,121	$50,923 â–¼	-0.1%	50,863,000	2.5%	NOTE 2.625%12/1
HEWLETT PACKARD ENTERPRISE C	$70,210,944	$69,246 â–¼	-0.1%	601,263	2.4%	7.625 MAND CONV
CABLE ONE INC	$58,775,896	$8,192,453 â–²	16.2%	89,888,000	2.0%	NOTE 1.125% 3/1
QXO INC	$57,413,691	$42,858 â–¼	-0.1%	1,169,488	1.9%	5.50 DEP PFD
BOEING CO	$56,171,414	$50,161 â–¼	-0.1%	828,674	1.9%	DEP CONV PFD A
TETRA TECH INC NEW	$55,268,887	$2,184,620 â–¼	-3.8%	52,445,000	1.9%	DBCV 2.250% 8/1
UBER TECHNOLOGIES INC	$54,331,944	$14,372 â–²	0.0%	45,364,000	1.8%	NOTE 0.875%12/0
SNOWFLAKE INC	$54,155,943	$48,263 â–¼	-0.1%	32,541,000	1.8%	NOTE 10/0
CHEFS WHSE INC	$53,041,671	$87,247 â–¼	-0.2%	23,710,000	1.8%	NOTE 2.375%12/1
ETSY INC	$50,886,574	$17,493,981 â–²	52.4%	49,886,000	1.7%	NOTE 0.125%10/0
NEXTERA ENERGY INC	$50,463,149	$25,099,591 â–²	99.0%	940,950	1.7%	UNIT 06/01/2027
PG&E CORP	$47,525,062	$70,592 â–²	0.1%	46,453,000	1.6%	NOTE 4.250%12/0
MICROCHIP TECHNOLOGY INC.	$46,450,746	$188,115 â–²	0.4%	603,491	1.6%	DEP SHS REPSTG
BTT Blackrock Municipal 2030 Target Term Trust	$44,771,545	$9,139,085 â–²	25.6%	1,967,980	1.5%	Finance
INTEGER HLDGS CORP	$43,942,264	$81,585 â–²	0.2%	45,243,000	1.5%	DBCV 1.875% 3/1
APOLLO GLOBAL MGMT INC	$43,457,785	$39,975 â–¼	-0.1%	713,153	1.5%	SER A MAND CNV
LIBERTY MEDIA CORP DEL	$42,050,710	$96,771 â–¼	-0.2%	33,894,000	1.4%	NOTE 2.250% 8/1
POST HLDGS INC	$41,655,230	$69,493 â–¼	-0.2%	40,161,000	1.4%	NOTE 2.500% 8/1
MERIT MED SYS INC	$41,080,767	$41,080,767 â–²	New Holding	38,073,000	1.4%	NOTE 3.000% 2/0
AKAMAI TECHNOLOGIES INC	$40,843,389	$246,088 â–²	0.6%	34,024,000	1.4%	NOTE 0.375% 9/0
ON SEMICONDUCTOR CORP	$39,963,727	$31,357,023 â–¼	-44.0%	21,949,000	1.3%	NOTE 5/0
NINE ENERGY SERVICE INC	$39,180,461	$713,846 â–¼	-1.8%	3,011,565	1.3%	COMMON STOCK
DATADOG INC	$39,071,712	$9,062,336 â–¼	-18.8%	27,438,000	1.3%	NOTE 12/0
REVOLUTION MEDICINES INC	$38,069,140	$38,069,140 â–²	New Holding	30,344,000	1.3%	NOTE 0.500% 5/0
FRESHPET INC	$36,956,373	$10,459 â–²	0.0%	31,800,000	1.2%	NOTE 3.000% 4/0
BRIDGEBIO PHARMA INC	$36,917,577	$62,160 â–¼	-0.2%	33,259,000	1.2%	NOTE 2.250% 2/0
IRHYTHM HOLDINGS INC	$35,896,303	$36,339 â–¼	-0.1%	32,598,000	1.2%	NOTE 1.500% 9/0
LIVE NATION ENTERTAINMENT IN	$35,565,452		0.0%	29,737,000	1.2%	NOTE 2.875% 1/1
PELOTON INTERACTIVE INC	$34,867,996	$3,376,676 â–²	10.7%	21,499,000	1.2%	NOTE 5.500%12/0
FLUOR CORP	$34,699,438	$192,281 â–¼	-0.6%	26,167,000	1.2%	NOTE 1.125% 8/1
JAZZ INVESTMENTS I LTD	$34,657,429	$34,657,429 â–²	New Holding	20,318,000	1.2%	NOTE 3.125% 9/1
NORTHERN OIL & GAS INC	$31,899,375	$52,780 â–¼	-0.2%	33,241,000	1.1%	NOTE 3.625% 4/1
AFFIRM HLDGS INC	$31,704,730	$43,266 â–¼	-0.1%	27,113,000	1.1%	NOTE 0.750%12/1
CYBERARK SOFTWARE LTD	$31,616,914	$31,616,914 â–²	New Holding	19,004,000	1.1%	NOTE 6/1
CLOUDFLARE INC	$31,512,824	$31,512,824 â–²	New Holding	24,872,000	1.1%	NOTE 6/1
UNITY SOFTWARE INC	$30,459,761	$2,264 â–²	0.0%	26,904,000	1.0%	NOTE 3/1
ORACLE CORP	$29,118,755	$47,118 â–¼	-0.2%	645,801	1.0%	6.5 DEP CUM SR D
MERITAGE HOMES CORP	$28,997,541	$97,241 â–¼	-0.3%	28,031,000	1.0%	NOTE 1.750% 5/1
PATRICK INDS INC	$28,330,050	$26,673 â–¼	-0.1%	19,118,000	0.9%	NOTE 1.750%12/0
LIBERTY MEDIA CORP DEL	$28,083,899		0.0%	24,458,000	0.9%	NOTE 3.750% 3/1
BURLINGTON STORES INC	$27,985,049	$4,550,025 â–¼	-14.0%	17,529,000	0.9%	NOTE 1.250%12/1
PROGRESS SOFTWARE CORP	$27,466,838	$98,954 â–¼	-0.4%	28,590,000	0.9%	NOTE 3.500% 3/0
BANK OF AMER CORP	$26,133,216	$76,619 â–¼	-0.3%	20,806	0.9%	7.25%CNV PFD L
PARSONS CORP DEL	$25,808,512	$33,534 â–²	0.1%	26,167,000	0.9%	NOTE 2.625% 3/0
BIOMARIN PHARMACEUTICAL INC	$25,738,211	$66,210 â–¼	-0.3%	26,434,000	0.9%	NOTE 1.250% 5/1
IAU iShares Gold Trust	$24,768,790	$4,691,436 â–¼	-15.9%	328,020	0.8%	ETF
DROPBOX INC	$24,614,876		0.0%	24,323,000	0.8%	NOTE 3/0
ARROWHEAD PHARMACEUTICALS IN	$24,483,945	$20,893,397 â–²	581.9%	20,457,000	0.8%	NOTE 1/1
DOORDASH INC	$24,370,238	$24,370,238 â–²	New Holding	24,710,000	0.8%	NOTE 5/1
SYNAPTICS INC	$24,040,173		0.0%	16,169,000	0.8%	NOTE 0.750%12/0
GUIDEWIRE SOFTWARE INC	$23,976,838	$227,150 â–¼	-0.9%	24,911,000	0.8%	NOTE 1.250%11/0
MYN BlackRock MuniYield New York Quality Fund	$23,849,323		0.0%	2,349,687	0.8%	Finance
MHD BlackRock MuniHoldings Fund	$23,590,025		0.0%	1,982,355	0.8%	Finance
RIVIAN AUTOMOTIVE INC	$22,057,291	$8,310 â–¼	0.0%	18,580,000	0.7%	NOTE 4.625% 3/1
GREENBRIER COS INC	$21,770,705		0.0%	19,032,000	0.7%	NOTE 2.875% 4/1
DEXCOM INC	$20,922,195	$7,051,848 â–¼	-25.2%	22,415,000	0.7%	NOTE 0.375% 5/1
UPSTART HLDGS INC	$20,632,987		0.0%	25,168,000	0.7%	NOTE 1.000%11/1
MQY BlackRock MuniYield Quality Fund	$18,490,621		0.0%	1,594,019	0.6%	Finance
SHIFT4 PMTS INC	$18,294,935	$358,125 â–¼	-1.9%	19,157,000	0.6%	NOTE 0.500% 8/0
ARES MANAGEMENT CORPORATION	$18,111,249	$11,288 â–¼	-0.1%	479,735	0.6%	6.75 SE B PFD
ALNYLAM PHARMACEUTICALS INC	$17,866,207	$12,044 â–¼	-0.1%	14,834,000	0.6%	NOTE 1.000% 9/1
WELLS FARGO & CO	$17,114,375	$13,925 â–¼	-0.1%	14,748	0.6%	PERP PFD CNV A
GULFPORT ENERGY CORP	$16,547,786	$183,276 â–¼	-1.1%	97,512	0.6%	COMMON SHARES
NUTANIX INC	$16,339,716	$12,902,112 â–¼	-44.1%	16,565,000	0.5%	NOTE 0.500%12/1
WORKIVA INC	$15,544,291	$248,371 â–¼	-1.6%	16,585,000	0.5%	NOTE 1.250% 8/1
RUBRIK INC.	$15,173,388	$15,173,388 â–²	New Holding	14,825,000	0.5%	NOTE 6/1
TALO Talos Energy	$15,026,053	$2,132,590 â–¼	-12.4%	1,163,908	0.5%	Energy
MGP INGREDIENTS INC NEW	$13,859,418	$42,815 â–¼	-0.3%	14,243,000	0.5%	NOTE 1.875%11/1
ADVANCED ENERGY INDS	$13,226,484	$95,043,335 â–¼	-87.8%	4,843,000	0.4%	NOTE 2.500% 9/1
BILL HOLDINGS INC	$13,083,618		0.0%	15,102,000	0.4%	NOTE 4/0
ALPHABET INC	$12,597,500	$12,597,500 â–²	New Holding	250,000	0.4%	DEP SHS RP1/20 B
GLOBAL PMTS INC	$11,591,100		0.0%	12,879,000	0.4%	NOTE 1.500% 3/0
NEXTERA ENERGY INC	$10,973,610	$10,973,610 â–²	New Holding	228,903	0.4%	UNIT 02/15/2029
MUJ BlackRock MuniHoldings New Jersey Quality Fund	$10,856,829	$3,274,214 â–¼	-23.2%	881,952	0.4%	Finance
WBD Warner Bros. Discovery	$9,545,880	$3,514,055 â–²	58.3%	358,060	0.3%	Communication Services
LIFE360 INC	$9,169,363	$9,169,363 â–²	New Holding	8,870,000	0.3%	NOTE 6/0
GUARDANT HEALTH INC	$8,928,130	$8,928,130 â–²	New Holding	7,179,000	0.3%	NOTE 11/1
LIVE NATION ENTERTAINMENT IN	$8,330,294	$89,075 â–¼	-1.1%	4,676,000	0.3%	NOTE 3.125% 1/1
SPECTRUM BRANDS INC	$8,208,208		0.0%	7,857,000	0.3%	NOTE 3.375% 6/0
VERTEX INC	$8,188,752	$29,527 â–¼	-0.4%	9,152,000	0.3%	NOTE 0.750% 5/0
TELADOC HEALTH INC	$7,313,623		0.0%	7,505,000	0.2%	NOTE 1.250% 6/0
CLOUDFLARE INC	$7,242,981	$55,251 â–¼	-0.8%	5,637,000	0.2%	NOTE 8/1
MIRUM PHARMACEUTICALS INC	$7,199,153	$78,044,439 â–¼	-91.6%	1,947,000	0.2%	NOTE 4.000% 5/0
WEC ENERGY GROUP INC	$6,396,106	$128,864 â–¼	-2.0%	5,162,000	0.2%	NOTE 4.375% 6/0
SOUTHERN CO	$6,134,334	$78,208 â–¼	-1.3%	5,569,000	0.2%	NOTE 4.500% 6/1
HALOZYME THERAPEUTICS INC	$6,007,958	$10,000 â–¼	-0.2%	5,407,000	0.2%	NOTE 0.250% 3/0
OSI SYSTEMS INC	$5,979,843	$53,332 â–¼	-0.9%	4,485,000	0.2%	NOTE 2.250% 8/0
MIY BlackRock MuniYield Michigan Quality Fund	$5,886,496	$2,199,054 â–¼	-27.2%	479,747	0.2%	Finance
GLD SPDR Gold Shares	$5,649,476		0.0%	15,336	0.2%	ETF
FIVE9 INC	$5,475,796	$97,862 â–¼	-1.8%	6,155,000	0.2%	NOTE 1.000% 3/1
NUTANIX INC	$5,163,914	$24,794 â–¼	-0.5%	4,582,000	0.2%	NOTE 0.250%10/0
MYI BlackRock MuniYield Quality Fund III	$4,877,335	$969,370 â–¼	-16.6%	439,004	0.2%	Finance
SOUTHERN CO	$4,870,689	$4,870,689 â–²	New Holding	4,815,000	0.2%	NOTE 3.250% 6/1
INTEGER HLDGS CORP	$4,572,930	$108,358 â–¼	-2.3%	3,756,000	0.2%	NOTE 2.125% 2/1
VFL abrdn National Municipal Income Fund	$4,165,577		0.0%	401,695	0.1%	Finance
IONIS PHARMACEUTICALS INC	$3,752,378	$12,429,169 â–¼	-76.8%	2,414,000	0.1%	NOTE 1.750% 6/1

Showing largest 100 holdings. View all holdings.

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

About Mackay Shields LLC

Investment Activity

Largest Holdings

Largest New Holdings this Quarter

Largest Purchases this Quarter

Largest Sales this Quarter

Sector Allocation Over Time

Latest 13F Holdings and Changes Since Previous Quarterly Filing

More Institutional Buying and Selling Information

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

About Mackay Shields LLC

Investment Activity

Largest Holdings

Largest New Holdings this Quarter

Largest Purchases this Quarter

Largest Sales this Quarter

Sector Allocation Over Time

Map of 500 Largest Holdings ofMackay Shields LLC

Latest 13F Holdings and Changes Since Previous Quarterly Filing

More Institutional Buying and Selling Information

MarketBeat All Access Features

Best-in-Class Portfolio Monitoring

Stock Ideas and Recommendations

Advanced Stock Screeners and Research Tools