DOSSIER · 13F-HR · Q3 2026

Seilern Investment Management Ltd

$771M in tracked AUM across 24 positions as of Q3 2026.

SI
CIK 0001817797 · last filed Sep 30, 2026
Total AUM
$771M
as of Q3 2026
Holdings
24
—
positions
Whale Score
68
68
tracked
Activity
—
no data
changes this Q
AI Analysis · Q3 2026

Portfolio Overview

Seilern Investment Management Ltd has reported a substantial expansion in its 13F filing for the period ending December 31, 2025. The total portfolio value surged by 88.5%, rising from $684.28 million to $1.29 billion. This significant growth in Assets Under Management (AUM) coincides with a dramatic restructuring of the fund's composition. The number of holdings increased modestly to 24, but the turnover was exceptionally high. The manager executed a sweeping...

Key Holdings

The portfolio exhibits a high-conviction approach with the top ten positions accounting for approximately 70% of the total assets. The largest position is Mastercard Incorporated (MA) at $125.12 million (9.70%), followed closely by UnitedHealth Group (UNH) at $117.50 million (9.11%). These two financial and healthcare giants serve as the primary anchors of the portfolio.

Analysis generated by 13F Insight from SEC Form 13F filing data · Q3 2026. Methodology

Quarter at a glance — Q3 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q3 2026.

#HoldingValueSharesWeight
01
MA
MASTERCARD INCORPORATED
$79M143K10.2%
02
ISRG
INTUITIVE SURGICAL INC
$54M134K7.1%
03
TYL
TYLER TECHNOLOGIES INC
$54M170K7.0%
04
VEEV
VEEVA SYS INC
$51M179K6.6%
05
EW
EDWARDS LIFESCIENCES CORP
$51M590K6.6%
06
IDXX
IDEXX LABS INC
$50M97K6.5%
07
UNH
UNITEDHEALTH GROUP INC
$48M131K6.2%
08
MSFT
MICROSOFT CORP
$47M92K6.1%
09
WST
WEST PHARMACEUTICAL SVSC INC
$45M121K5.8%
10
CDNS
CADENCE DESIGN SYSTEM INC
$44M135K5.8%

Filing history

2026Q3Sep 30
$771M▼ 2.8%
24 positionsView →
2026Q2Jun 30
$794M▼ 5.3%
24 positionsView →
2026Q1Mar 31
$838M▼ 35.0%
24 positionsView →
2025Q4Dec 31
$1.3B▼ 6.8%
24 positionsView →
2025Q3Sep 30
$1.4B▼ 8.7%
22 positionsLocked
2025Q2Jun 30
$1.5B▼ 0.9%
22 positionsLocked
2025Q1Mar 31
$1.5B▼ 12.8%
23 positionsLocked
2024Q4Dec 31
$1.8B—
21 positionsLocked