AI Portfolio Summary
In 2026 Q1, MACKAY SHIELDS LLC maintained a portfolio of 139 distinct positions. The most significant new addition to the portfolio was INTEGER HLDGS CORP, which now represents 1.59% of the total fund value. The fund also reduced its exposure to SEAGATE HDD CAYMAN by 50.1%.
Total Positions
139
Quarter
2026 Q1
Top Holding
N/A (5.3%)
Top 10 Concentration
28.4%
Turnover Rate
23.4%
Sector HHI
0.18
Items per page:
Showing 1-50 of 139
| Stock | History | Sector / Type | Port % | Prev % | Rank / Prev | Conviction | Change | % Change | Influence | Shares | Mkt Value | Avg Cost | Price Held | 1st Owned | Source | Source Date | Date Reported |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
N/A
LUMENTUM HLDGS ...
|
—
|
Bond/Debt | 5.26% | 2.99% |
#1
1
Prev: #2
|
4.6 | -3,251,000 | -10.8% |
P
S
|
26,786,000 | $143,553,199 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
WESTERN DIGITAL...
|
—
|
Bond/Debt | 4.06% | 3.03% |
#2
1
Prev: #1
|
3.6 | -3,406,000 | -18.0% |
P
S
|
15,476,000 | $110,830,313 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
ADVANCED ENERGY...
|
—
|
Bond/Debt | 3.50% | 2.56% |
#3
Prev: #3
|
2.9 | -4,994,000 | -11.2% |
P
S
|
39,644,000 | $95,383,178 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
MIRUM PHARMACEU...
|
—
|
Bond/Debt | 2.53% | 2.31% |
#4
Prev: #4
|
2.0 | -2,478,000 | -9.7% |
P
S
|
23,054,000 | $68,958,198 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
QXOBV
QXO INC
|
Preferred | 2.39% | 2.28% |
#5
1
Prev: #6
|
2.0 | -798 | -0.1% |
P
S
|
1,170,361 | $65,257,945 | 2025 Q2 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
N/A
LANTHEUS HLDGS ...
|
—
|
Bond/Debt | 2.24% | 2.28% |
#6
1
Prev: #5
|
1.4 | -5,816,000 | -10.3% |
P
S
|
50,898,000 | $61,196,398 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
MKS INC.
|
—
|
Bond/Debt | 2.21% | 1.63% |
#7
8
Prev: #15
|
1.4 | -38,000 | -0.1% |
P
S
|
36,510,000 | $60,398,440 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
CABLE ONE INC
|
—
|
Bond/Debt | 2.14% | 1.98% |
#8
1
Prev: #9
|
2.9 | 7,960,000 | 11.5% |
P
S
|
77,359,000 | $58,367,366 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
TETRA TECH INC ...
|
—
|
Unknown | 2.10% | 2.27% |
#9
2
Prev: #7
|
1.3 | -5,105,000 | -8.6% |
P
S
|
54,518,000 | $57,176,031 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
UBER TECHNOLOGI...
|
—
|
Bond/Debt | 2.00% | 1.94% |
#10
Prev: #10
|
2.8 | 2,708,000 | 6.4% |
P
S
|
45,352,000 | $54,602,805 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
BA/PRA
BOEING CO
|
Preferred | 1.98% | 2.02% |
#11
3
Prev: #8
|
1.3 | -683 | -0.1% |
P
S
|
829,414 | $53,888,370 | 2024 Q4 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
N/A
ON SEMICONDUCTO...
|
—
|
Bond/Debt | 1.86% | 1.64% |
#12
2
Prev: #14
|
1.2 | -209,000 | -0.5% |
P
S
|
39,171,000 | $50,596,799 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
PG&E CORP
|
—
|
Bond/Debt | 1.76% | 1.85% |
#13
Prev: #13
|
1.2 | -5,067,000 | -9.8% |
P
S
|
46,384,000 | $48,059,496 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
POST HLDGS INC
|
—
|
Bond/Debt | 1.60% | 1.87% |
#14
2
Prev: #12
|
1.1 | -9,286,000 | -18.8% |
P
S
|
40,228,000 | $43,617,687 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
INTEGER HLDGS C...
|
—
|
Unknown | 1.59% | — |
#15
Prev: #—
|
4.1 | 45,159,000 | no change |
NEW
|
45,159,000 | $43,284,902 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
APO/PRA
APOLLO GLOBAL M...
|
Unknown | 1.54% | 1.89% |
#16
5
Prev: #11
|
1.1 | -483 | -0.1% |
P
S
|
713,809 | $41,972,244 | 2023 Q3 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
N/A
LIBERTY MEDIA C...
|
—
|
Bond/Debt | 1.44% | 1.51% |
#17
2
Prev: #19
|
1.1 | -64,000 | -0.2% |
P
S
|
33,972,000 | $39,259,692 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
AKAMAI TECHNOLO...
|
—
|
Bond/Debt | 1.44% | 1.19% |
#18
11
Prev: #29
|
1.1 | -40,000 | -0.1% |
P
S
|
33,819,000 | $39,249,674 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
HPE/PRC
HEWLETT PACKARD...
|
Unknown | 1.43% | 1.39% |
#19
1
Prev: #20
|
1.1 | 3,993 | 0.7% |
P
S
|
601,856 | $39,017,575 | 2024 Q3 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
N/A
SNOWFLAKE INC
|
—
|
Bond/Debt | 1.41% | 1.55% |
#20
2
Prev: #18
|
2.6 | 2,717,000 | 9.1% |
P
S
|
32,570,000 | $38,519,136 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
NCL CORP LTD
|
—
|
Bond/Debt | 1.39% | 1.36% |
#21
Prev: #21
|
1.6 | no change | no change |
P
S
|
38,891,000 | $37,977,062 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
BRIDGEBIO PHARM...
|
—
|
Bond/Debt | 1.37% | 1.13% |
#22
12
Prev: #34
|
2.5 | 4,637,000 | 16.2% |
P
S
|
33,315,000 | $37,363,518 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
NORTHERN OIL & ...
|
—
|
Bond/Debt | 1.34% | 1.02% |
#23
20
Prev: #43
|
2.5 | 3,273,000 | 10.9% |
P
S
|
33,296,000 | $36,612,868 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
FRESHPET INC
|
—
|
Bond/Debt | 1.34% | 0.87% |
#24
27
Prev: #51
|
3.0 | 10,444,000 | 48.9% |
P
S
|
31,791,000 | $36,577,109 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
IRHYTHM HOLDING...
|
—
|
Bond/Debt | 1.31% | 1.60% |
#25
9
Prev: #16
|
1.0 | -51,000 | -0.2% |
P
S
|
32,631,000 | $35,753,016 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
BTT
BLACKROCK MUN T...
|
Financial Services | 1.30% | 1.09% |
#26
11
Prev: #37
|
2.5 | 202,135 | 14.8% |
P
S
|
1,566,262 | $35,554,147 | 2016 Q3 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
N/A
CHEFS WHSE INC
|
—
|
Bond/Debt | 1.29% | 1.27% |
#27
2
Prev: #25
|
1.0 | -35,000 | -0.1% |
P
S
|
23,749,000 | $35,100,896 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
IAU
ISHARES GOLD TR
|
ETF | 1.26% | 1.35% |
#28
6
Prev: #22
|
1.0 | -84,850 | -17.9% |
P
S
|
390,150 | $34,395,624 | 2017 Q1 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
MCHPP
MICROCHIP TECHN...
|
Technology | 1.26% | 1.23% |
#29
1
Prev: #28
|
1.0 | -427 | -0.1% |
P
S
|
601,047 | $34,317,119 | 2025 Q1 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
N/A
BURLINGTON STOR...
|
—
|
Bond/Debt | 1.24% | 1.06% |
#30
9
Prev: #39
|
1.5 | no change | no change |
P
S
|
20,379,000 | $33,727,245 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
PATRICK INDS IN...
|
—
|
Bond/Debt | 1.22% | 1.26% |
#31
5
Prev: #26
|
1.0 | -2,012,000 | -9.5% |
P
S
|
19,136,000 | $33,200,623 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
DATADOG INC
|
—
|
Bond/Debt | 1.20% | 1.18% |
#32
1
Prev: #31
|
1.5 | no change | no change |
P
S
|
33,802,000 | $32,796,390 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
FLUOR CORP
|
—
|
Bond/Debt | 1.19% | 1.05% |
#33
7
Prev: #40
|
1.0 | 14,000 | 0.1% |
P
S
|
26,312,000 | $32,483,988 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
LIVE NATION ENT...
|
—
|
Bond/Debt | 1.18% | 1.09% |
#34
2
Prev: #36
|
1.0 | 52,000 | 0.2% |
P
S
|
29,737,000 | $32,115,960 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
ETSY INC
|
—
|
Bond/Debt | 1.17% | 1.31% |
#35
11
Prev: #24
|
1.0 | -4,309,000 | -11.6% |
P
S
|
32,736,000 | $32,002,036 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
SEAGATE HDD CAY...
|
—
|
Bond/Debt | 1.16% | 1.56% |
#36
19
Prev: #17
|
0.5 | -6,655,000 | -50.1% |
P
S
|
6,638,000 | $31,536,807 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
ORACLE CORP
|
—
|
Unknown | 1.09% | — |
#37
Prev: #—
|
3.9 | 646,846 | no change |
NEW
|
646,846 | $29,719,538 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
DEXCOM INC
|
—
|
Bond/Debt | 1.01% | 1.19% |
#38
8
Prev: #30
|
0.9 | -6,943,000 | -18.8% |
P
S
|
29,970,000 | $27,631,980 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
MERITAGE HOMES ...
|
—
|
Bond/Debt | 1.00% | 1.26% |
#39
12
Prev: #27
|
0.4 | -8,245,000 | -22.7% |
P
S
|
28,125,000 | $27,195,970 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
UNITY SOFTWARE ...
|
—
|
Bond/Debt | 0.98% | — |
#40
Prev: #—
|
3.9 | 26,902,000 | no change |
NEW
|
26,902,000 | $26,841,871 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
NUTANIX INC
|
—
|
Bond/Debt | 0.98% | 1.00% |
#41
3
Prev: #44
|
0.9 | 35,000 | 0.1% |
P
S
|
29,645,000 | $26,814,055 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
NEE/PRS
NEXTERA ENERGY ...
|
Unknown | 0.98% | 0.84% |
#42
12
Prev: #54
|
0.9 | 9,591 | 2.1% |
P
S
|
472,936 | $26,667,570 | 2025 Q3 | 13F Filing | 2026-03-31 | 2026-04-27 | |||
|
N/A
PELOTON INTERAC...
|
—
|
Bond/Debt | 0.95% | — |
#43
Prev: #—
|
3.9 | 19,417,000 | no change |
NEW
|
19,417,000 | $26,005,440 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
PARSONS CORP DE...
|
—
|
Bond/Debt | 0.95% | 0.94% |
#44
2
Prev: #46
|
1.4 | no change | no change |
P
S
|
26,133,000 | $25,780,205 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
BIOMARIN PHARMA...
|
—
|
Bond/Debt | 0.94% | 1.16% |
#45
13
Prev: #32
|
0.4 | -8,153,000 | -23.5% |
P
S
|
26,502,000 | $25,563,296 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
PROGRESS SOFTWA...
|
—
|
Bond/Debt | 0.94% | 1.02% |
#46
4
Prev: #42
|
0.9 | 51,000 | 0.2% |
P
S
|
28,693,000 | $25,556,214 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
LIBERTY MEDIA C...
|
—
|
Bond/Debt | 0.93% | 1.04% |
#47
6
Prev: #41
|
0.9 | -5,117,000 | -17.3% |
P
S
|
24,458,000 | $25,477,319 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
AFFIRM HLDGS IN...
|
—
|
Bond/Debt | 0.93% | 0.94% |
#48
1
Prev: #47
|
2.4 | 2,891,000 | 11.9% |
P
S
|
27,150,000 | $25,467,276 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
NINE ENERGY SER...
|
—
|
Unknown | 0.92% | — |
#49
Prev: #—
|
3.9 | 3,066,434 | no change |
NEW
|
3,066,434 | $25,144,758 | — | 13F Filing | 2026-03-31 | 2026-04-27 | ||
|
N/A
GUIDEWIRE SOFTW...
|
—
|
Bond/Debt | 0.92% | 0.97% |
#50
5
Prev: #45
|
1.4 | no change | no change |
P
S
|
25,147,000 | $25,099,850 | — | 13F Filing | 2026-03-31 | 2026-04-27 |
Showing 1-50 of 139 holdings