MACKAY SHIELDS LLC — 13F Holdings & Portfolio
CIK 61227 · latest 13F-HR filed 2026-07-28
MACKAY SHIELDS LLC manages $2.99B in 13F-reported U.S. long-equity assets across 306 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are WDC (3.76%), GOOGM (3.29%), MKSI (3.18%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 13 new positions, exited 16, added to 36, and trimmed 22.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
32ND FLOOR
NEW YORK, NY 10171
$2.99B
Long-equity book
306
Distinct positions
2026-06-30
Filed 2026-07-28
+13 / −16 / ↑36 / ↓22
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- MKS INC.$47.1M +77.9%
- WESTERN DIGITAL CORP$40.0M +36.1%
- HEWLETT PACKARD ENTERPRISE C$31.2M +79.9%
- NEXTERA ENERGY INC$23.8M +89.2%
- ARROWHEAD PHARMACEUTICALS IN$21.4M +686.9%
Top Trims
- ADVANCED ENERGY INDS-$82.2M -86.1%
- MIRUM PHARMACEUTICALS INC-$61.8M -89.6%
- LUMENTUM HLDGS INC-$59.4M -41.4%
- IONIS PHARMACEUTICALS INC-$12.0M -76.1%
- ON SEMICONDUCTOR CORP-$10.6M -21.0%
New Positions
- ALPHABET INC$122.6M
- MERIT MED SYS INC$41.1M
- REVOLUTION MEDICINES INC$38.1M
- JAZZ INVESTMENTS I LTD$34.7M
- CYBERARK SOFTWARE LTD$31.6M
Exited Positions
- NCL CORP LTD$38.0M
- SEAGATE HDD CAYMAN$31.5M
- JAZZ INVESTMENTS I LTD$15.9M
- LUMENTUM HLDGS INC$15.6M
- CHEESECAKE FACTORY INC$15.2M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | WESTERN DIGITAL CORP | WDC | 958102AT2 | $112.4M | 3.76% | 6,670,000 | PRN |
| 2 | ALPHABET INC | GOOGM | 02079K404 | $98.1M | 3.29% | 1,944,160 | SH |
| 3 | MKS INC. | MKSI | 55306NAB0 | $94.8M | 3.18% | 32,168,000 | PRN |
| 4 | LANTHEUS HLDGS INC | LNTH | 516544AB9 | $63.0M | 2.11% | 43,266,000 | PRN |
| 5 | LUMENTUM HLDGS INC | LITE | 55024UAF6 | $62.8M | 2.10% | 9,622,000 | PRN |
| 6 | HEWLETT PACKARD ENTERPRISE C | HPEPC | 42824C208 | $57.6M | 1.93% | 492,700 | SH |
| 7 | QXO INC | QXOPB | 82846H504 | $49.8M | 1.67% | 1,013,696 | SH |
| 8 | NEXTERA ENERGY INC | NEEPS | 65339F663 | $47.5M | 1.59% | 885,400 | SH |
| 9 | TETRA TECH INC NEW | TTEK | 88162GAB9 | $46.7M | 1.56% | 44,292,000 | PRN |
| 10 | BOEING CO | BAPA | 097023204 | $46.5M | 1.56% | 685,600 | SH |
| 11 | ETSY INC | ETSY | 29786AAJ5 | $45.5M | 1.53% | 44,632,000 | PRN |
| 12 | UBER TECHNOLOGIES INC | UBER | 90353TAM2 | $43.3M | 1.45% | 36,109,000 | PRN |
| 13 | INTEGER HLDGS CORP | USFD | 45826HAD1 | $41.9M | 1.40% | 43,153,000 | PRN |
| 14 | SNOWFLAKE INC | SNOW | 833445AB5 | $41.6M | 1.39% | 25,007,000 | PRN |
| 15 | CHEFS WHSE INC | CHEF | 163086AE1 | $40.6M | 1.36% | 18,159,000 | PRN |
| 16 | MERIT MED SYS INC | MMSI | 589889AB0 | $39.0M | 1.31% | 36,190,000 | PRN |
| 17 | PG&E CORP | PCG | 69331CAL2 | $38.8M | 1.30% | 37,877,000 | PRN |
| 18 | DATADOG INC | DDOG | 23804LAD5 | $37.4M | 1.25% | 26,233,000 | PRN |
| 19 | MICROCHIP TECHNOLOGY INC. | MCHPP | 595017302 | $37.2M | 1.25% | 482,525 | SH |
| 20 | APOLLO GLOBAL MGMT INC | APO | 03769M304 | $36.4M | 1.22% | 597,400 | SH |
| 21 | REVOLUTION MEDICINES INC | RVMDW | 76155XAA8 | $36.3M | 1.22% | 28,938,000 | PRN |
| 22 | POST HLDGS INC | POST | 737446AT1 | $35.2M | 1.18% | 33,960,000 | PRN |
| 23 | CABLE ONE INC | CABO | 12685JAG0 | $34.9M | 1.17% | 53,520,000 | PRN |
| 24 | LIBERTY MEDIA CORP DEL | FWONA | 531229AQ5 | $34.8M | 1.16% | 28,022,000 | PRN |
| 25 | LIVE NATION ENTERTAINMENT IN | LYV | 538034BC2 | $34.1M | 1.14% | 28,500,000 | PRN |
| 26 | JAZZ INVESTMENTS I LTD | JAZZ | 472145AH4 | $33.5M | 1.12% | 19,636,000 | PRN |
| 27 | IRHYTHM HOLDINGS INC | IRTC | 450056AB2 | $32.5M | 1.09% | 29,518,000 | PRN |
| 28 | AKAMAI TECHNOLOGIES INC | AKAM | 00971TAL5 | $32.4M | 1.08% | 26,957,000 | PRN |
| 29 | BRIDGEBIO PHARMA INC | BBIO | 10806XAD4 | $32.2M | 1.08% | 29,011,000 | PRN |
| 30 | WESTERN DIGITAL CORP | WDC | 958102AT2 | $31.4M | 1.05% | 1,863,000 | PRN |
| 31 | FRESHPET INC | FRPT | 358039AB1 | $30.6M | 1.02% | 26,288,000 | PRN |
| 32 | CYBERARK SOFTWARE LTD | CYBR | 23248VAD7 | $30.2M | 1.01% | 18,176,000 | PRN |
| 33 | CLOUDFLARE INC | PSAPF | 18915MAF4 | $30.0M | 1.00% | 23,645,000 | PRN |
| 34 | ON SEMICONDUCTOR CORP | ON | 682189AS4 | $29.8M | 1.00% | 16,360,000 | PRN |
| 35 | PELOTON INTERACTIVE INC | PTON | 70614WAD2 | $29.0M | 0.97% | 17,864,000 | PRN |
| 36 | NINE ENERGY SERVICE INC | NINE | 65441V200 | $27.5M | 0.92% | 2,116,912 | SH |
| 37 | AFFIRM HLDGS INC | AFRM | 00827BAD8 | $27.4M | 0.92% | 23,386,000 | PRN |
| 38 | FLUOR CORP | FLR | 343412AJ1 | $27.3M | 0.92% | 20,591,000 | PRN |
| 39 | LIBERTY MEDIA CORP DEL | FWONA | 531229AP7 | $26.8M | 0.90% | 23,328,000 | PRN |
| 40 | BURLINGTON STORES INC | BURL | 122017AD8 | $26.7M | 0.90% | 16,755,000 | PRN |
| 41 | UNITY SOFTWARE INC | U | 91332UAH4 | $25.3M | 0.85% | 22,383,000 | PRN |
| 42 | ISHARES GOLD TR | IAU | 464285204 | $24.8M | 0.83% | 328,020 | SH |
| 43 | PARSONS CORP DEL | PSN | 70202LAD4 | $24.6M | 0.83% | 24,984,000 | PRN |
| 44 | PATRICK INDS INC | PATK | 703343AG8 | $24.3M | 0.82% | 16,420,000 | PRN |
| 45 | NORTHERN OIL & GAS INC | NOG | 665531AJ8 | $24.3M | 0.81% | 25,325,000 | PRN |
| 46 | PROGRESS SOFTWARE CORP | PRGS | 743312AD2 | $24.1M | 0.81% | 25,048,000 | PRN |
| 47 | BLACKROCK MUN TARGET TERM TR | BTT | 09257P105 | $23.5M | 0.79% | 1,031,187 | SH |
| 48 | CABLE ONE INC | CABO | 12685JAG0 | $23.4M | 0.78% | 35,843,000 | PRN |
| 49 | DROPBOX INC | DBX | 26210CAD6 | $23.4M | 0.78% | 23,099,000 | PRN |
| 50 | DOORDASH INC | DASH | 25809KAB1 | $23.3M | 0.78% | 23,650,000 | PRN |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-07-28 | $2.99B | 306 | 0000061227-26-000002 |
| 2026-03-31 | 2026-04-27 | $2.73B | 307 | 0001085146-26-000371 |
| 2025-12-31 | 2026-01-29 | $2.86B | 340 | 0000061227-26-000001 |