MACKAY SHIELDS LLC
13F Reported Value
ⓘ$2.7B
Holdings
111
Latest Filing
2026-03-31
Filing Quarter
Q1 2026
Portfolio Overview
MACKAY SHIELDS LLC disclosed 111 positions worth $2.7B in its Form 13F-HR for Q1 2026, led by $LITE (Lumentum Holdings Inc.) at 5.3% of the equity portfolio, followed by $WDC and $AEIS. During the quarter the fund opened 7 new positions and exited 24 and a full exit from $TYL. The portfolio is most concentrated in Technology (31.6% of disclosed assets). All figures are sourced directly from MACKAY SHIELDS LLC’s Form 13F-HR filing with the SEC under CIK 61227.
AI Fund Analysis
DiversifyingSector Allocation
AUM History
Top Equity Holdings by Value
Quarterly Activity — Q1 2026
Click any card to unlockTop Holdings
- 63.4#685
Quality
$143.6M26,786,000 sh - 76.8#98
Quality
$110.8M15,476,000 sh - 61.9#779
Quality
$95.4M39,644,000 sh - 32.7
Quality
$69.0M23,054,000 sh - 53.5
Quality
$65.3M1,170,361 sh - 66.9
Quality
$61.2M50,898,000 sh - 59.8
Quality
$60.4M36,510,000 sh - 35.4
Quality
$58.4M77,359,000 sh TETRA TECH INC NEW
—Quality
$57.2M54,518,000 sh- 79.3
Quality
$54.6M45,352,000 sh
| Company | Quality | Value | Shares |
|---|---|---|---|
 Lumentum Holdings Inc.$LITE | 63.4#685 | $143.6M | 26,786,000 |
 WESTERN DIGITAL CORP$WDC | 76.8#98 | $110.8M | 15,476,000 |
 ADVANCED ENERGY INDUSTRIES INC$AEIS | 61.9#779 | $95.4M | 39,644,000 |
 Mirum Pharmaceuticals, Inc.$MIRM | 32.7 | $69.0M | 23,054,000 |
 QXO, Inc.$QXO | 53.5 | $65.3M | 1,170,361 |
 Lantheus Holdings, Inc.$LNTH | 66.9 | $61.2M | 50,898,000 |
 MKS INC$MKSI | 59.8 | $60.4M | 36,510,000 |
 Cable One, Inc.$CABO | 35.4 | $58.4M | 77,359,000 |
| TETRA TECH INC NEW | — | $57.2M | 54,518,000 |
 Uber Technologies, Inc$UBER | 79.3 | $54.6M | 45,352,000 |
Unlock AI quality scores for every holding
32-signal composite ranking on each of MACKAY SHIELDS LLC's 111 positions.
Showing top 10 of 111 holdings.
Sector Allocation
Technology
$862.4M
Other
$504.9M
Healthcare
$308.6M
Industrials
$260.7M
Financials
$186.2M
Communication Services
$143.1M
Consumer Discretionary
$140.4M
Consumer Staples
$129.1M
Full Holdings — MACKAY SHIELDS LLC (Q1 2026)
All 111 disclosed positions from the latest Form 13F-HR, with quarter-over-quarter share changes and 13F Pro quality scores. Sourced from SEC EDGAR.
| # | Ticker | Company | Value | Weight | QoQ | Quality |
|---|---|---|---|---|---|---|
| 1 | $LITE | Lumentum Holdings Inc. | $143.6M | 5.3% | -6% | 63.4 |
| 2 | $WDC | WESTERN DIGITAL CORP | $110.8M | 4.1% | +1958% | 76.8 |
| 3 | $AEIS | ADVANCED ENERGY INDUSTRIES INC | $95.4M | 3.5% | +2508% | 61.9 |
| 4 | $MIRM | Mirum Pharmaceuticals, Inc. | $69.0M | 2.5% | +1% | 32.7 |
| 5 | $QXO | QXO, Inc. | $65.3M | 2.4% | +2508% | 53.5 |
| 6 | $LNTH | Lantheus Holdings, Inc. | $61.2M | 2.2% | +837% | 66.9 |
| 7 | $MKSI | MKS INC | $60.4M | 2.2% | +1166% | 59.8 |
| 8 | $CABO | Cable One, Inc. | $58.4M | 2.1% | +199% | 35.4 |
| 9 | — | TETRA TECH INC NEW | $57.2M | 2.1% | +884% | — |
| 10 | $UBER | Uber Technologies, Inc | $54.6M | 2.0% | +2526% | 79.3 |
| 11 |  $BA | BOEING CO | $53.9M | 2.0% | NEW | 51.8 |
| 12 |  $ON | ON SEMICONDUCTOR CORP | $50.6M | 1.9% | NEW | 42.4 |
| 13 |  $PCG | PG&E Corp | $48.1M | 1.8% | +892% | 59.3 |
| 14 |  $POST | Post Holdings, Inc. | $43.6M | 1.6% | -7% | 53.8 |
| 15 | — | INTEGER HLDGS CORP | $43.3M | 1.6% | NEW | — |
| 16 |  $APO | Apollo Global Management, Inc. | $42.0M | 1.5% | +728% | 55.7 |
| 17 |  $FWONA | Liberty Media Corp | $39.3M | 1.4% | +21% | 51 |
| 18 |  $AKAM | AKAMAI TECHNOLOGIES INC | $39.2M | 1.4% | +511% | 62 |
| 19 | — | HEWLETT PACKARD ENTERPRISE C | $39.0M | 1.4% | +2699% | — |
| 20 |  $SNOW | Snowflake Inc. | $38.5M | 1.4% | +794% | 49.6 |
| 21 | — | NCL CORP LTD | $38.0M | 1.4% | +3% | — |
| 22 |  $BBIO | BridgeBio Pharma, Inc. | $37.4M | 1.4% | +21% | 31.7 |
| 23 |  $NOG | NORTHERN OIL & GAS, INC. | $36.6M | 1.3% | +826% | 45.3 |
| 24 |  $FRPT | Freshpet, Inc. | $36.6M | 1.3% | +75% | 65.1 |
| 25 |  $IRTC | iRhythm Holdings, Inc. | $35.8M | 1.3% | +3160% | 41.1 |
| 26 |  $BTT | BlackRock Municipal 2030 Target Term Trust | $35.6M | 1.3% | +267% | — |
| 27 |  $CHEF | Chefs' Warehouse, Inc. | $35.1M | 1.3% | NEW | 58.3 |
| 28 |  $IAU | ISHARES GOLD TRUST | $34.4M | 1.3% | -18% | — |
| 29 |  $MCHP | MICROCHIP TECHNOLOGY INC | $34.3M | 1.3% | +25% | 40 |
| 30 |  $BURL | Burlington Stores, Inc. | $33.7M | 1.2% | +4% | 59.4 |
| 31 |  $PATK | PATRICK INDUSTRIES INC | $33.2M | 1.2% | NEW | 56 |
| 32 |  $DDOG | Datadog, Inc. | $32.8M | 1.2% | +4% | 62.9 |
| 33 |  $FLR | FLUOR CORP | $32.5M | 1.2% | NEW | 66.2 |
| 34 |  $LYV | Live Nation Entertainment, Inc. | $32.1M | 1.2% | +2409% | 55 |
| 35 |  $ETSY | ETSY INC | $32.0M | 1.2% | +2348% | 50.4 |
| 36 | — | SEAGATE HDD CAYMAN | $31.5M | 1.2% | -48% | — |
| 37 | — | ORACLE CORP | $29.7M | 1.1% | NEW | — |
| 38 |  $DXCM | DEXCOM INC | $27.6M | 1.0% | NEW | 77.9 |
| 39 |  $MTH | Meritage Homes CORP | $27.2M | 1.0% | +1375% | — |
| 40 | — | UNITY SOFTWARE INC | $26.8M | 1.0% | NEW | — |
| 41 |  $NTNX | Nutanix, Inc. | $26.8M | 1.0% | +2096% | 68.8 |
| 42 |  $NEE | NEXTERA ENERGY INC | $26.7M | 1.0% | +49% | 71.7 |
| 43 |  $PTON | PELOTON INTERACTIVE, INC. | $26.0M | 0.9% | NEW | 41.6 |
| 44 |  $PSN | PARSONS CORP | $25.8M | 0.9% | +5% | 60.3 |
| 45 |  $BMRN | BIOMARIN PHARMACEUTICAL INC | $25.6M | 0.9% | +1872% | 74.1 |
| 46 |  $PRGS | PROGRESS SOFTWARE CORP /MA | $25.6M | 0.9% | NEW | 58.2 |
| 47 | — | LIBERTY MEDIA CORP DEL | $25.5M | 0.9% | +2064% | — |
| 48 |  $AFRM | Affirm Holdings, Inc. | $25.5M | 0.9% | +16% | 71.7 |
| 49 |  $NINE | Nine Energy Service, Inc. | $25.1M | 0.9% | NEW | 26.1 |
| 50 |  $GWRE | Guidewire Software, Inc. | $25.1M | 0.9% | +6% | 66.2 |
| 51 |  $BAC | BANK OF AMERICA CORP /DE/ | $24.9M | 0.9% | +8487% | 68.4 |
| 52 |  $DBX | DROPBOX, INC. | $23.1M | 0.8% | +5% | 65.8 |
| 53 |  $MYN | BLACKROCK MUNIYIELD NEW YORK QUALITY FUND, INC. | $22.6M | 0.8% | +269% | — |
| 54 |  $MHD | BLACKROCK MUNIHOLDINGS FUND, INC. | $22.4M | 0.8% | +21% | — |
| 55 | — | GREENBRIER COS INC | $22.0M | 0.8% | +3245% | — |
| 56 |  $TALO | TALOS ENERGY INC. | $20.9M | 0.8% | -49% | 49.2 |
| 57 |  $GPOR | GULFPORT ENERGY CORP | $20.9M | 0.8% | -0% | 64.3 |
| 58 | — | RIVIAN AUTOMOTIVE INC | $19.9M | 0.7% | +3717% | — |
| 59 |  $ALNY | ALNYLAM PHARMACEUTICALS, INC. | $19.1M | 0.7% | +1345% | 60.9 |
| 60 |  $FOUR | Shift4 Payments, Inc. | $18.4M | 0.7% | -49% | 60 |
| 61 |  $UPST | Upstart Holdings, Inc. | $17.9M | 0.7% | +2569% | 51.7 |
| 62 |  $ARES | Ares Management Corp | $17.8M | 0.7% | +1633% | 70.8 |
| 63 |  $MQY | BLACKROCK MUNIYIELD QUALITY FUND, INC. | $17.5M | 0.6% | +2157% | — |
| 64 |  $WFC | WELLS FARGO & COMPANY/MN | $17.1M | 0.6% | NEW | — |
| 65 |  $SYNA | SYNAPTICS Inc | $16.8M | 0.6% | +1761% | 45.3 |
| 66 | — | JAZZ INVESTMENTS I LTD | $15.9M | 0.6% | +7% | — |
| 67 |  $WK | WORKIVA INC | $15.8M | 0.6% | +4% | 52.8 |
| 68 |  $IONS | IONIS PHARMACEUTICALS INC | $15.7M | 0.6% | +1970% | 37.1 |
| 69 | $LITE | Lumentum Holdings Inc. | $15.6M | 0.6% | +1329% | 63.4 |
| 70 |  $CAKE | CHEESECAKE FACTORY INC | $15.2M | 0.6% | +67% | 58.3 |
| 71 |  $MGPI | MGP INGREDIENTS INC | $13.8M | 0.5% | +298% | 28.7 |
| 72 |  $BILL | BILL Holdings, Inc. | $13.5M | 0.5% | +8% | 56.8 |
| 73 |  $MUJ | BLACKROCK MUNIHOLDINGS NEW JERSEY QUALITY FUND, INC. | $13.3M | 0.5% | +198% | — |
| 74 |  $QTWO | Q2 Holdings, Inc. | $13.2M | 0.5% | +1120% | 62.4 |
| 75 |  $AVAV | AeroVironment Inc | $13.0M | 0.5% | +1663% | 42.1 |
| 76 |  $GPN | GLOBAL PAYMENTS INC | $11.4M | 0.4% | -21% | 42.9 |
| 77 |  $VERX | Vertex, Inc. | $8.0M | 0.3% | +1190% | 49.8 |
| 78 |  $SPB | Spectrum Brands Holdings, Inc. | $7.9M | 0.3% | +1666% | 44.8 |
| 79 |  $MIY | BLACKROCK MUNIYIELD MICHIGAN QUALITY FUND, INC. | $7.8M | 0.3% | +57% | — |
| 80 |  $TDOC | Teladoc Health, Inc. | $7.2M | 0.3% | -49% | 38.2 |
| 81 | $LYV | Live Nation Entertainment, Inc. | $7.2M | 0.3% | NEW | 55 |
| 82 |  $OSIS | OSI SYSTEMS INC | $6.9M | 0.3% | +9737% | 64.1 |
| 83 |  $NET | Cloudflare, Inc. | $6.6M | 0.2% | +3056% | 52.6 |
| 84 |  $GLD | SPDR GOLD TRUST | $6.6M | 0.2% | +0% | — |
| 85 |  $WEC | WEC ENERGY GROUP, INC. | $6.5M | 0.2% | +3151% | 67 |
| 86 |  $NBH | NEUBERGER MUNICIPAL FUND INC. | $6.3M | 0.2% | -49% | — |
| 87 |  $SO | SOUTHERN CO | $6.3M | 0.2% | +3069% | 65.1 |
| 88 |  $WBD | Warner Bros. Discovery, Inc. | $6.2M | 0.2% | +917% | 42.1 |
| 89 |  $HALO | HALOZYME THERAPEUTICS, INC. | $5.6M | 0.2% | NEW | 81.2 |
| 90 |  $MYI | BLACKROCK MUNIYIELD QUALITY FUND III, INC. | $5.5M | 0.2% | NEW | — |
| 91 |  $FIVN | Five9, Inc. | $5.5M | 0.2% | -49% | 58.1 |
| 92 |  $NRK | NUVEEN NEW YORK AMT-FREE QUALITY MUNICIPAL INCOME FUND | $5.3M | 0.2% | +198% | — |
| 93 | $NTNX | Nutanix, Inc. | $4.7M | 0.2% | +2949% | 68.8 |
| 94 |  $ITGR | Integer Holdings Corp | $4.5M | 0.2% | +8444% | 50.2 |
| 95 |  $VFL | abrdn National Municipal Income Fund | $4.0M | 0.1% | +0% | — |
| 96 | — | ARROWHEAD PHARMACEUTICALS IN | $3.1M | 0.1% | NEW | — |
| 97 |  $VGM | Invesco Trust for Investment Grade Municipals | $2.1M | 0.1% | +13% | — |
| 98 |  $VKQ | Invesco Municipal Trust | $2.0M | 0.1% | +37% | — |
| 99 |  $MFM | ABERDEEN MUNICIPAL INCOME FUND | $1.8M | 0.1% | -2% | — |
| 100 |  $MUC | BLACKROCK MUNIHOLDINGS CALIFORNIA QUALITY FUND, INC. | $1.5M | 0.1% | -84% | — |
| 101 | — | NUVEEN PA INVT QUALITY MUN F | $1.4M | 0.1% | -49% | — |
| 102 |  $EIM | Eaton Vance Municipal Bond Fund | $1.2M | 0.1% | -50% | — |
| 103 |  $VMO | Invesco Municipal Opportunity Trust | $1.2M | 0.0% | -1% | — |
| 104 |  $NZF | Nuveen Municipal Credit Income Fund | $677,927 | 0.0% | -72% | — |
| 105 |  $BL | BLACKLINE, INC. | $598,329 | 0.0% | +0% | 49.9 |
| 106 |  $PPL | PPL Corp | $586,375 | 0.0% | +0% | 70.3 |
| 107 |  $DUK | Duke Energy CORP | $551,750 | 0.0% | +0% | 64 |
| 108 |  $VKI | Invesco Advantage Municipal Income Trust II | $392,471 | 0.0% | -15% | — |
| 109 | — | NEW YORK LIFE INVTS ACTIVE E | $295,090 | 0.0% | +107% | — |
| 110 |  $WW | WW INTERNATIONAL, INC. | $197,458 | 0.0% | +0% | 26.4 |
| 111 |  $CHGG | CHEGG, INC | $43,425 | 0.0% | +0% | 19.4 |
New Positions (7)
Exited Positions (24)
$TYL TYLER TECHNOLOGIES INC
$RPD Rapid7, Inc.
$EXPE Expedia Group, Inc.
$BFK BLACKROCK MUNICIPAL INCOME TRUST
$MHN BLACKROCK MUNIHOLDINGS NEW YORK QUALITY FUND, INC.
$MTN VAIL RESORTS INC
$MYD BLACKROCK MUNIYIELD FUND, INC.
$BYM BLACKROCK MUNICIPAL INCOME QUALITY TRUST
$F FORD MOTOR CO
$BLE BLACKROCK MUNICIPAL INCOME TRUST II
$MVF BLACKROCK MUNIVEST FUND, INC.
$BNY BLACKROCK NEW YORK MUNICIPAL INCOME TRUST
$BLK BlackRock, Inc.
$KTF DWS MUNICIPAL INCOME TRUSTBrowse Top Institutional Investors
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