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Super Investors MacKay Shields LLC
MS

MacKay Shields LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$2.76B
Positions
103
Quarter ended
September 30, 2026
Filed
October 13, 2026

Reported portfolio value by quarter (54 quarters reported)

$16.4B $1.81B
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q3 26

$1.88B in Q2 2013 → $2.76B now. Hover for any quarter.

Holdings

As reported for the quarter ended September 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Alphabet Inc 4.3% Added 0.0% 2,428,006 $120M
HP Hewlett Packard Enterprise C 3.6% Added 0.0% 601,487 $98.6M
Snowflake Inc 2.9% Added 13% 36,870,000 $79.6M
LH Lumentum Hldgs Inc 2.7% Trimmed 21% 10,149,000 $75M
Mks Inc. 2.4% Added 0.0% 36,475,000 $66.9M
Cloudflare Inc 2.4% Added 68% 41,867,000 $66.1M
Revolution Medicines Inc 2.3% Added 61% 48,743,000 $62.8M
Uber Technologies Inc 2.1% Added 14% 51,770,000 $59.3M
TT Tetra Tech Inc New 2.0% Trimmed 0.1% 52,404,000 $55.7M
Western Digital Corp 1.9% Trimmed 51% 4,403,000 $52.7M
Qxo Inc 1.9% Added 20% 1,407,248 $52.2M
PG&E Corp 1.8% Added 11% 51,400,000 $50.4M
Boeing Co 1.8% Added 0.0% 829,048 $48.9M
Nextera Energy Inc 1.7% Unchanged 940,950 $45.9M
MM Merit Med Sys Inc 1.6% Trimmed 0.2% 38,006,000 $44.2M
Microchip Technology Inc. 1.6% Added 6.8% 644,345 $43M
BM Blackrock Mun Target Term Tr 1.6% Unchanged 1,967,980 $43M
Akamai Technologies Inc 1.5% Added 11% 37,876,000 $42.1M
Freshpet Inc 1.5% Added 15% 36,464,000 $41.1M
LM Liberty Media Corp Del 1.4% Added 0.1% 33,914,000 $39.8M
PH Post Hldgs Inc 1.4% Added 0.1% 40,191,000 $39.7M
Datadog Inc 1.4% Unchanged 27,438,000 $39.5M
Oracle Corp 1.4% Added 37% 883,365 $38.8M
Guidewire Software Inc 1.4% Added 59% 39,638,000 $38.8M
AH Affirm Hldgs Inc 1.4% Added 37% 37,054,000 $38.5M
Unity Software Inc 1.3% Added 0.1% 26,935,000 $36.2M
Cyberark Software Ltd 1.3% Unchanged 19,004,000 $35.6M
Irhythm Holdings Inc 1.3% Added 0.0% 32,610,000 $34.7M
Bridgebio Pharma Inc 1.2% Trimmed 0.1% 33,241,000 $34.1M
NO Northern Oil & Gas Inc 1.2% Added 0.1% 33,280,000 $33.4M
LN Live Nation Entertainment In 1.2% Unchanged 29,737,000 $32.6M
On Semiconductor Corp 1.2% Added 0.1% 21,969,000 $32.6M
Fluor Corp 1.2% Added 0.1% 26,188,000 $32.4M
Itron Inc 1.1% New 32,877,000 $31.7M
Axon Enterprise Inc 1.1% New 32,000,000 $31.5M
Etsy Inc 1.1% New 28,370,000 $31.4M
Doordash Inc 1.1% Added 31% 32,353,000 $30.8M
Peloton Interactive Inc 1.1% Added 0.1% 21,530,000 $30.7M
Ares Management Corporation 1.1% Added 60% 766,553 $29.4M
Progress Software Corp 1.0% Added 1.3% 28,955,000 $28.4M
AP Arrowhead Pharmaceuticals In 1.0% Added 33% 27,193,000 $27.8M
NG Nebius Group N.v. 1.0% New 14,822,000 $27.4M
Meritage Homes Corp 1.0% Added 0.3% 28,105,000 $27M
Dropbox Inc 1.0% Unchanged 24,323,000 $27M
SH Siriusxm Holdings Inc 0.9% Unchanged 24,458,000 $26.1M
Biomarin Pharmaceutical Inc 0.9% Added 0.1% 26,468,000 $25.8M
Rubrik Inc. 0.9% Added 45% 21,544,000 $25.7M
Nova Ltd 0.9% New 18,294,000 $25.7M
BO Bank Of Amer Corp 0.9% Added 0.1% 20,836 $25.5M
PD Parsons Corp Del 0.9% Unchanged 26,167,000 $24.6M
Burlington Stores Inc 0.9% Added 0.4% 17,598,000 $24.1M
Cable One Inc 0.8% Trimmed 0.1% 89,763,000 $23.3M
Tempus Ai Inc 0.8% New 18,554,000 $23.3M
PI Patrick Inds Inc 0.8% Trimmed 0.4% 19,038,000 $22.7M
Nine Energy Service Inc 0.8% Trimmed 0.8% 2,988,165 $22.4M
Dexcom Inc 0.8% Added 0.3% 22,472,000 $21.3M
Rivian Automotive Inc 0.7% Added 0.9% 18,738,000 $20.6M
BM Blackrock Muniyield N Y Qual 0.7% Unchanged 2,349,687 $20.6M
BM Blackrock Muniholdings Fd In 0.7% Unchanged 1,982,355 $20.3M
Synaptics Inc 0.7% Trimmed 0.3% 16,119,000 $20.3M

Showing top 60 of 103 positions.

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q3 2026

quarter ended September 30, 2026 · filed October 13, 2026

Company Action Shares changed Value of change % of portfolio
LH Lantheus Hldgs Inc Exited −50,863,000 −$74M —
Western Digital Corp Trimmed −4,549,000 −$54.5M 1.9%
CW Chefs Whse Inc Exited −23,710,000 −$53M —
Etsy Inc Exited −49,886,000 −$50.9M —
IH Integer Hldgs Corp Exited −45,243,000 −$43.9M —
AG Apollo Global Mgmt Inc Exited −713,153 −$43.5M —
JI Jazz Investments I Ltd Exited −20,318,000 −$34.7M —
Itron Inc New +32,877,000 +$31.7M 1.1%
Axon Enterprise Inc New +32,000,000 +$31.5M 1.1%
Etsy Inc New +28,370,000 +$31.4M 1.1%

Showing the 10 largest of 88 changes.

Q2 2026

quarter ended June 30, 2026 · filed July 28, 2026

Company Action Shares changed Value of change % of portfolio
Alphabet Inc New +2,427,303 +$123M 4.1%
Western Digital Corp Trimmed −6,524,000 −$110M 5.1%
AE Advanced Energy Inds Trimmed −34,801,000 −$95M 0.4%
LH Lumentum Hldgs Inc Trimmed −13,902,000 −$90.8M 2.8%
Mirum Pharmaceuticals Inc Trimmed −21,107,000 −$78M 0.2%
MM Merit Med Sys Inc New +38,073,000 +$41.1M 1.4%
Revolution Medicines Inc New +30,344,000 +$38.1M 1.3%
N Ncl Corp Ltd Exited −38,891,000 −$38M —
JI Jazz Investments I Ltd New +20,318,000 +$34.7M 1.2%
Cyberark Software Ltd New +19,004,000 +$31.6M 1.1%

Showing the 10 largest of 104 changes.

Q1 2026

quarter ended March 31, 2026 · filed April 27, 2026

Company Action Shares changed Value of change % of portfolio
IH Integer Hldgs Corp New +45,159,000 +$43.3M 1.6%
SH Seagate Hdd Cayman Trimmed −6,655,000 −$31.6M 1.2%
FM Ford Mtr Co Exited −30,093,000 −$31.3M —
TT Tyler Tex Indpt Sch Dist Exited −30,319,000 −$30.7M —
Oracle Corp New +646,846 +$29.7M 1.1%
Unity Software Inc New +26,902,000 +$26.8M 1.0%
Talos Energy Inc Trimmed −1,679,338 −$26.5M 0.8%
Peloton Interactive Inc New +19,417,000 +$26M 1.0%
Nine Energy Service Inc New +3,066,434 +$25.1M 0.9%
Cable One Inc Exited −24,975,000 −$24.7M —

Showing the 10 largest of 117 changes.

Q4 2025

quarter ended December 31, 2025 · filed January 29, 2026

Company Action Shares changed Value of change % of portfolio
Halozyme Therapeutics Inc Trimmed −45,264,000 −$48.8M 0.2%
Osi Systems Inc Trimmed −28,014,000 −$41.5M 0.2%
SH Seagate Hdd Cayman Trimmed −12,275,000 −$41.3M 1.6%
Nutanix Inc Trimmed −36,136,000 −$40.6M 0.2%
Datadog Inc New +33,802,000 +$33.8M 1.2%
LN Live Nation Entertainment In New +29,685,000 +$31.3M 1.1%
Nutanix Inc New +29,610,000 +$28.6M 1.0%
Guidewire Software Inc New +25,147,000 +$27.7M 1.0%
Ionis Pharmaceuticals Inc Trimmed −17,383,000 −$27.7M 0.6%
AH Affirm Hldgs Inc New +24,259,000 +$26.9M 0.9%

Showing the 10 largest of 123 changes.

Q3 2025

quarter ended September 30, 2025 · filed October 27, 2025

Company Action Shares changed Value of change % of portfolio
Halozyme Therapeutics Inc New +50,503,000 +$58M 2.0%
Nice Ltd Exited −58,184,000 −$57.6M —
Halozyme Therapeutics Inc Exited −43,628,000 −$49.8M —
Nextera Energy Inc Exited −1,204,627 −$48M —
Osi Systems Inc New +32,536,000 +$47.3M 1.6%
Snowflake Inc New +26,382,000 +$40.1M 1.4%
PR Permian Res Oper LLC Exited −14,774,000 −$35.8M —
NA Nuveen Amt Free Qlty Mun Inc Trimmed −2,201,319 −$25.1M 0.7%
CI Chart Inds Inc Exited −400,972 −$24.4M —
Freshpet Inc New +21,572,000 +$24.3M 0.8%

Showing the 10 largest of 118 changes.

Q2 2025

quarter ended June 30, 2025 · filed July 24, 2025

Company Action Shares changed Value of change % of portfolio
Nrg Energy Inc Exited −33,232,000 −$77.4M —
Qxo Inc New +918,702 +$56.6M 1.8%
On Semiconductor Corp New +45,179,000 +$53.6M 1.7%
On Semiconductor Corp Exited −56,011,000 −$48.4M —
Cloudflare Inc Trimmed −31,471,000 −$37.2M 0.2%
Mks Inc. New +37,307,000 +$36.9M 1.2%
Meritage Homes Corp New +37,250,000 +$36.2M 1.2%
Fluor Corp New +26,904,000 +$35.3M 1.1%
Dexcom Inc New +37,468,000 +$35.3M 1.1%
SA Southwest Airls Co Exited −33,931,000 −$33.9M —

Showing the 10 largest of 106 changes.

Q1 2025

quarter ended March 31, 2025 · filed April 29, 2025

Company Action Shares changed Value of change % of portfolio
IH Integer Hldgs Corp Trimmed −38,079,000 −$55.5M 0.2%
Datadog Inc Exited −25,398,000 −$39.4M —
Cloudflare Inc New +37,498,000 +$37.7M 1.2%
Enphase Energy Inc Exited −33,454,000 −$31.3M —
SA Southwest Airls Co Trimmed −28,873,000 −$28.9M 1.1%
Booking Holdings Inc Trimmed −11,000,000 −$27.1M 0.9%
GP Global Pmts Inc New +27,430,000 +$26M 0.8%
Microchip Technology Inc. New +508,650 +$25.5M 0.8%
Kosmos Energy Ltd New +32,707,000 +$25.2M 0.8%
Euronet Worldwide Inc Exited −24,415,000 −$24.3M —

Showing the 10 largest of 113 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 04, 2025

Company Action Shares changed Value of change % of portfolio
Microchip Technology Inc. Exited −77,438,000 −$77.4M —
Zillow Group Inc Exited −49,057,000 −$72.6M —
PG&E Corp New +61,006,000 +$66.4M 2.0%
LH Lumentum Hldgs Inc Trimmed −54,846,000 −$60.2M 0.2%
LN Live Nation Entertainment In Trimmed −35,152,000 −$47.8M 0.2%
SP Shift4 Pmts Inc New +40,000,000 +$43.2M 1.3%
Uber Technologies Inc New +38,010,000 +$42M 1.2%
SP Shift4 Pmts Inc Trimmed −31,244,000 −$42M 0.2%
Boeing Co New +627,351 +$38.6M 1.1%
Envestnet Inc Exited −33,199,000 −$35.3M —

Showing the 10 largest of 97 changes.

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