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 and exited 16; 36 existing positions rose in reported value and 22 fell.
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.
Long-equity book
Distinct positions
Filed 2026-07-28
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.
Sector mix
% of 13F valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q1 26 → Q2 26Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.
13F assets and positions
3 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 28.5%Cumulative share of the portfolio held in the largest N positions.
32ND FLOOR
NEW YORK, NY 10171
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| ABOU-JAOUDE, NAIM, (NMN) Control | CHAIRMAN OF THE BOARD OF MANAGERS | Less than 5% | Individual |
| BUSTAMANTE, RENE, ARTURO Control | CHIEF ADMINISTRATIVE OFFICER, EXECUTIVE MANAGING DIRECTOR | Less than 5% | Individual |
| DEPALMA, MICHAEL, (NMN) Control | SENIOR MANAGING DIRECTOR | Less than 5% | Individual |
| DIMELLA, ROBERT, ALAN Control | EXECUTIVE MANAGING DIRECTOR | Less than 5% | Individual |
| HARTE, FRANCIS, MICHAEL Control | ELECTED TO THE BOARD OF MANAGERS | Less than 5% | Individual |
| KARAOGLAN, ALAIN, MAURICE Control | ELECTED TO THE BOARD OF MANAGERS | Less than 5% | Individual |
| LEHNEIS, KIRK, CHRISTOPHER Control | ELECTED TO BOARD OF MANAGERS | Less than 5% | Individual |
| LOFFREDO, JOHN, MICHAEL Control | VICE CHAIRMAN, EXECUTIVE MANAGING DIRECTOR, ELECTED TO THE BOARD OF MANAGERS | Less than 5% | Individual |
| MORIARTY, CORNELIUS, JOSEPH Control | SENIOR MANAGING DIRECTOR | Less than 5% | Individual |
| Micucci, Alison, Hiers Control | CHIEF EXECUTIVE OFFICER, ELECTED TO THE BOARD OF MANAGERS | Less than 5% | Individual |
| NEW YORK LIFE INSURANCE COMPANY Control | INDIRECT INTEREST HOLDER | General partner | Domestic Entity |
| NEW YORK LIFE INVESTMENT MANAGEMENT HOLDINGS LLC Control | SOLE MEMBER | 75% or more | Domestic Entity |
| SABAL, CRAIG, ANDREW Control | ELECTED TO THE BOARD OF MANAGERS | Less than 5% | Individual |
| SUSSER, ANDREW, MARK Control | EXECUTIVE MANAGING DIRECTOR | Less than 5% | Individual |
| CORKER, MICHAEL, DANIEL | CHIEF FINANCIAL OFFICER, SENIOR MANAGING DIRECTOR | Less than 5% | Individual |
| FITZGERALD, CHRISTOPHER, PAUL | CHIEF COMPLIANCE OFFICER, MANAGING DIRECTOR | Less than 5% | Individual |
| LEE, YOUNG, (NMN) | GENERAL COUNSEL, SENIOR MANAGING DIRECTOR | Less than 5% | Individual |
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
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
MacKay Shields LLC Holdings (2026-06-30)
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 | — | 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 | NET | 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 |
32ND FLOOR
NEW YORK, NY 10171