Mackay Shields LLC holds a diversified book of 111 stocks worth $2.7B as of Q1 2026 (disclosed Apr 27, 2026, a ~45-day 13F lag). This quarter they opened Integer Holdings Corp and trimmed Lumentum Holdings Inc. Their largest long position is Lumentum Holdings Inc at 5% of the equity book.
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Use Arkolith to show MACKAY SHIELDS LLC's latest holdings, largest changes, and filing provenance.
Top-heavy: diversified book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
4% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices, no cost basis
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Lumentum Hldgs Inc NOTE 0.500% 6/1 | $143.6M | 26.79M | 5.3% | ▼−11% Reduced · −3.3M sh | |
| 2 | Western Digital Corp NOTE 3.000%11/1 | $110.8M | 15.48M | 4.1% | ▼−18% Reduced · −3.4M sh | |
| 3 | Advanced Energy Inds NOTE 2.500% 9/1 | $95.4M | 39.64M | 3.5% | ▼−11% Reduced · −5.0M sh | |
| 4 | Mirum Pharmaceuticals Inc NOTE 4.000% 5/0 | $69.0M | 23.05M | 2.5% | ▼−9.7% Reduced · −2.5M sh | |
| 5 | Qxo Inc 5.50 DEP PFD | $65.3M | 1.17M | 2.4% | ▼−0.1% Reduced · −798 sh | |
| 6 | Lantheus Hldgs Inc NOTE 2.625%12/1 | $61.2M | 50.90M | 2.2% | ▼−10% Reduced · −5.8M sh | |
| 7 | MKS Inc. NOTE 1.250% 6/0 | $60.4M | 36.51M | 2.2% | ▼−0.1% Reduced · −38K sh | |
| 8 | Cable One Inc NOTE 1.125% 3/1 | $58.4M | 77.36M | 2.1% | ▲+11% Added · +8.0M sh | |
| 9 | Tetra Tech Inc New DBCV 2.250% 8/1 | $57.2M | 54.52M | 2.1% | ▼−8.6% Reduced · −5.1M sh | |
| 10 | Uber Technologies Inc NOTE 0.875%12/0 | $54.6M | 45.35M | 2.0% | ▲+6.3% Added · +2.7M sh | |
| 11 | Boeing Co DEP CONV PFD A | $53.9M | 829.4K | 2.0% | ▼−0.1% Reduced · −683 sh | |
| 12 | On Semiconductor Corp NOTE 5/0 | $50.6M | 39.17M | 1.9% | ▼−0.5% Reduced · −209K sh | |
| 13 | PG&E Corp NOTE 4.250%12/0 | $48.1M | 46.38M | 1.8% | ▼−9.8% Reduced · −5.1M sh | |
| 14 | Post Hldgs Inc NOTE 2.500% 8/1 | $43.6M | 40.23M | 1.6% | ▼−19% Reduced · −9.3M sh | |
| 15 | Integer Hldgs Corp DBCV 1.875% 3/1 | $43.3M | 45.16M | 1.6% | ▲New New position | |
| 16 | Apollo Global Mgmt Inc SER A MAND CNV | $42.0M | 713.8K | 1.5% | ▼−0.1% Reduced · −483 sh | |
| 17 | Liberty Media Corp Del NOTE 2.250% 8/1 | $39.3M | 33.97M | 1.4% | ▼−0.2% Reduced · −64K sh | |
| 18 | Akamai Technologies Inc NOTE 0.375% 9/0 | $39.2M | 33.82M | 1.4% | ▼−0.1% Reduced · −40K sh | |
| 19 | Hewlett Packard Enterprise C 7.625 MAND CONV | $39.0M | 601.9K | 1.4% | ▲+0.7% Added · +4K sh | |
| 20 | Snowflake Inc NOTE 10/0 | $38.5M | 32.57M | 1.4% | ▲+9.1% Added · +2.7M sh | |
| 21 | NCL Corp Ltd NOTE 1.125% 2/1 | $38.0M | 38.89M | 1.4% | —Held | |
| 22 | Bridgebio Pharma Inc NOTE 2.250% 2/0 | $37.4M | 33.31M | 1.4% | ▲+16% Added · +4.6M sh | |
| 23 | Northern Oil & Gas Inc NOTE 3.625% 4/1 | $36.6M | 33.30M | 1.3% | ▲+11% Added · +3.3M sh | |
| 24 | Freshpet Inc NOTE 3.000% 4/0 | $36.6M | 31.79M | 1.3% | ▲+49% Added · +10.4M sh | |
| 25 | Irhythm Holdings Inc NOTE 1.500% 9/0 | $35.8M | 32.63M | 1.3% | ▼−0.1% Reduced · −51K sh | |
| 26 | BlackRock Mun Target Term TR COM SHS BEN IN | $35.6M | 1.57M | 1.3% | ▲+15% Added · +202K sh | |
| 27 | Chefs Whse Inc NOTE 2.375%12/1 | $35.1M | 23.75M | 1.3% | ▼−0.1% Reduced · −35K sh | |
| 28 | Ishares Gold TR ISHARES NEW | $34.4M | 390.1K | 1.3% | ▼−18% Reduced · −85K sh | |
| 29 | Microchip Technology Inc. DEP SHS REPSTG | $34.3M | 601.0K | 1.3% | ▼−0.1% Reduced · −427 sh | |
| 30 | Burlington Stores Inc NOTE 1.250%12/1 | $33.7M | 20.38M | 1.2% | —Held | |
| 31 | Patrick Inds Inc NOTE 1.750%12/0 | $33.2M | 19.14M | 1.2% | ▼−9.5% Reduced · −2.0M sh | |
| 32 | Datadog Inc NOTE 12/0 | $32.8M | 33.80M | 1.2% | —Held | |
| 33 | Fluor Corp NOTE 1.125% 8/1 | $32.5M | 26.31M | 1.2% | ▲+0.1% Added · +14K sh | |
| 34 | Live Nation Entertainment In NOTE 2.875% 1/1 | $32.1M | 29.74M | 1.2% | ▲+0.2% Added · +52K sh | |
| 35 | Etsy Inc NOTE 0.125%10/0 | $32.0M | 32.74M | 1.2% | ▼−12% Reduced · −4.3M sh | |
| 36 | Seagate HDD Cayman NOTE 3.500% 6/0 | $31.5M | 6.64M | 1.2% | ▼−50% Reduced · −6.7M sh | |
| 37 | Oracle Corp 6.5 DEP CUM SR D | $29.7M | 646.8K | 1.1% | ▲New New position | |
| 38 | Dexcom Inc NOTE 0.375% 5/1 | $27.6M | 29.97M | 1.0% | ▼−19% Reduced · −6.9M sh | |
| 39 | Meritage Homes Corp NOTE 1.750% 5/1 | $27.2M | 28.13M | 1.0% | ▼−23% Reduced · −8.2M sh | |
| 40 | Unity Software Inc NOTE 3/1 | $26.8M | 26.90M | 1.0% | ▲New New position | |
| 41 | Nutanix Inc NOTE 0.500%12/1 | $26.8M | 29.64M | 1.0% | ▲+0.1% Added · +35K sh | |
| 42 | NextEra Energy Inc UNIT 06/01/2027 | $26.7M | 472.9K | 1.0% | ▲+2.1% Added · +10K sh | |
| 43 | Peloton Interactive Inc NOTE 5.500%12/0 | $26.0M | 19.42M | 1.0% | ▲New New position | |
| 44 | Parsons Corp Del NOTE 2.625% 3/0 | $25.8M | 26.13M | 0.9% | —Held | |
| 45 | Biomarin Pharmaceutical Inc NOTE 1.250% 5/1 | $25.6M | 26.50M | 0.9% | ▼−24% Reduced · −8.2M sh | |
| 46 | Progress Software Corp NOTE 3.500% 3/0 | $25.6M | 28.69M | 0.9% | ▲+0.2% Added · +51K sh | |
| 47 | Liberty Media Corp Del NOTE 3.750% 3/1 | $25.5M | 24.46M | 0.9% | ▼−17% Reduced · −5.1M sh | |
| 48 | Affirm Hldgs Inc NOTE 0.750%12/1 | $25.5M | 27.15M | 0.9% | ▲+12% Added · +2.9M sh | |
| 49 | Nine Energy Service Inc COMMON STOCK | $25.1M | 3.07M | 0.9% | ▲New New position | |
| 50 | Guidewire Software Inc NOTE 1.250%11/0 | $25.1M | 25.15M | 0.9% | —Held |
As-of date vs the date the SEC received each filing
| Quarter | As of | Filed | Positions | Value | Form |
|---|---|---|---|---|---|
| Q1 2026 | Mar 31, 2026 | Apr 27, 2026 | 307 | $2.7B | 13F-HR |
| Q4 2025 | Dec 31, 2025 | Jan 29, 2026 | 340 | $2.9B | 13F-HR |
| Q3 2025 | Sep 30, 2025 | Oct 27, 2025 | 354 | $2.9B | 13F-HR |
| Q2 2025 | Jun 30, 2025 | Jul 24, 2025 | 364 | $3.1B | 13F-HR |
| Q1 2025 | Mar 31, 2025 | Apr 29, 2025 | 361 | $3.1B | 13F-HR |
| Q4 2024 | Dec 31, 2024 | Feb 4, 2025 | 367 | $3.4B | 13F-HR |
| Q3 2024 | Sep 30, 2024 | Oct 31, 2024 | 368 | $3.6B | 13F-HR |
| Q2 2024 | Jun 30, 2024 | Aug 8, 2024 | 345 | $3.3B | 13F-HR |
| Q1 2024 | Mar 31, 2024 | May 3, 2024 | 361 | $3.6B | 13F-HR |
| Q4 2023 | Dec 31, 2023 | Feb 2, 2024 | 360 | $3.4B | 13F-HR |
| Q3 2023 | Sep 30, 2023 | Oct 25, 2023 | 333 | $3.6B | 13F-HR |
| Q2 2023 | Jun 30, 2023 | Jul 27, 2023 | 374 | $3.6B | 13F-HR |
| Q1 2023 | Mar 31, 2023 | Apr 27, 2023 | 386 | $3.6B | 13F-HR |
| Q4 2022 | Dec 31, 2022 | Jan 31, 2023 | 462 | $3.9B | 13F-HR |
| Q3 2022 | Sep 30, 2022 | Nov 2, 2022 | 466 | $4.0B | 13F-HR |
| Q2 2022 | Jun 30, 2022 | Aug 3, 2022 | 498 | $4.1B | 13F-HR |
| Q1 2022 | Mar 31, 2022 | May 13, 2022 | 1,438 | $11.4B | 13F-HR |
| Q4 2021 | Dec 31, 2021 | Feb 4, 2022 | 1,442 | $12.0B | 13F-HR |
| Q3 2021 | Sep 30, 2021 | Jan 18, 2022 | 1,395 | $10.6B | 13F-HR/A |
| Q2 2021 | Jun 30, 2021 | Aug 13, 2021 | 1,378 | $10.6B | 13F-HR |
| Q1 2021 | Mar 31, 2021 | May 14, 2021 | 2,988 | $13.7B | 13F-HR |
| Q4 2020 | Dec 31, 2020 | Feb 16, 2021 | 3,172 | $14.5B | 13F-HR |
| Q3 2020 | Sep 30, 2020 | Nov 4, 2020 | 2,990 | $14.7B | 13F-HR |
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.