13F Insight
DOSSIER · 13F-HR · Q1 2026

MACKAY SHIELDS LLC

$2.7B in tracked AUM across 307 positions as of Q1 2026.

MS
CIK 0000061227 · last filed Mar 31, 2026
Total AUM
$2.7B
as of Q1 2026
Holdings
307
—
positions
Whale Score
50
50
tracked
Activity
—
no data
changes this Q
AI Analysis · Q1 2026

MACKAY SHIELDS LLC filed its latest 13F-HR for Q1 2026. See the latest holdings and position changes below.

Quarter at a glance — Q1 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q1 2026.

#HoldingValueSharesWeight
01
LITE 0.5 06/15/28
LUMENTUM HLDGS INC
$144M26.8M5.3%02
WDC 3 11/15/28
WESTERN DIGITAL CORP
$111M15.5M4.1%03
AEIS 2.5 09/15/28
ADVANCED ENERGY INDS
$95M39.6M3.5%04
MIRM 4 05/01/29
MIRUM PHARMACEUTICALS INC
$69M23.1M2.5%05
QXO 5.5 05/15/28
QXO INC
$65M1.2M2.4%06
LNTH 2.625 12/15/27
LANTHEUS HLDGS INC
$61M50.9M2.2%07
MKSI 1.25 06/01/30
MKS INC.
$60M36.5M2.2%08
CABO 1.125 03/15/28
CABLE ONE INC
$58M77.4M2.1%09
TTEK 2.25 08/15/28
TETRA TECH INC NEW
$57M54.5M2.1%10
90353TAM2
UBER TECHNOLOGIES INC
$55M45.4M2.0%

Filing history

2026Q1Mar 31
$2.7B▼ 4.5%
307 positionsView →2025Q4Dec 31
$2.9B▲ 6.7%
340 positionsView →2025Q3Sep 30
$2.7B▼ 14.2%
320 positionsView →2025Q2Jun 30
$3.1B▲ 10.7%
364 positionsLocked2025Q1Mar 31
$2.8B▼ 16.9%
324 positionsLocked2024Q4Dec 31
$3.4B▼ 7.0%
367 positionsLocked2024Q3Sep 30
$3.6B▲ 10.9%
368 positionsLocked2024Q2Jun 30
$3.3B▼ 8.8%
345 positionsLocked2024Q1Mar 31
$3.6B▲ 5.3%
361 positionsLocked2023Q4Dec 31
$3.4B▼ 5.7%
360 positionsLocked2023Q3Sep 30
$3.6B▲ 1.6%
333 positionsLocked2023Q2Jun 30
$3.6B▼ 1.8%
374 positionsLocked
Showing 12 of 100