Seilern Investment Management Ltd
Long book
$838.5M
Q1 2026
Positions
24
Top-10 weight
71%
concentration
Last quarter
+9.7%
SPY +14.8%
Turnover
0%
of book per quarter
Strategy in plain words
auto-generated from filingsSeilern Investment Management Ltd is a concentrated fundamental stock-picker, running a $838.5M US long book across 24 positions.
The portfolio is concentrated: the top 10 names carry 71% of the portfolio. The book barely moves quarter to quarter — a patient, low-turnover holder. Current anchor positions: MASTERCARD INC - A, UNITEDHEALTH GROUP INC, TYLER TECHNOLOGIES INC, WEST PHARMACEUTICAL SERVICES, VEEVA SYSTEMS INC-CLASS A.
Over the last 6 quarters its long book ran on average 4.4pp per quarter behind the S&P 500, beating the index in 0 of 6 quarters. We rate its filings highest-signal: new buys here are worth attention.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q4 2024
-6.1%
Q1 2025
+6.6%
Q2 2025
+4.9%
Q3 2025
+2.0%
Q4 2025
-16.0%
Q1 2026
+9.7%
Sector allocation
Technology 42%
Healthcare 27%
Services media 15%
Financials 10%
Materials 5%
Industrials 1%
Consumer discretionary 0%
Long book by quarter
What does Seilern Investment own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| MA MASTERCARD INC - A | Services media | 178.0K | $88.9M | 10.6% | -18.8% |
| UNH UNITEDHEALTH GROUP INC | Financials | 281.1K | $76.1M | 9.1% | -21.0% |
| TYL TYLER TECHNOLOGIES INC | Technology | 182.3K | $62.4M | 7.4% | +20.7% |
| WST WEST PHARMACEUTICAL SERVICES | Healthcare | 226.0K | $56.6M | 6.8% | -18.8% |
| VEEV VEEVA SYSTEMS INC-CLASS A | Technology | 316.3K | $55.6M | 6.6% | +0.8% |
| EW EDWARDS LIFESCIENCES CORP | Healthcare | 690.2K | $55.3M | 6.6% | -25.2% |
| GOOGL ALPHABET INC-CL A | Technology | 185.5K | $53.3M | 6.4% | -31.2% |
| ADSK AUTODESK INC | Technology | 205.1K | $49.1M | 5.9% | -13.4% |
| MSFT MICROSOFT CORP | Technology | 131.8K | $48.8M | 5.8% | -28.3% |
| IDXX IDEXX LABORATORIES INC | Materials | 80.8K | $45.4M | 5.4% | -19.8% |
| ISRG INTUITIVE SURGICAL INC | Healthcare | 98.4K | $45.3M | 5.4% | -25.7% |
| ADBE ADOBE INC | Technology | 177.0K | $43.0M | 5.1% | -23.7% |
| CDNS CADENCE DESIGN SYS INC | Technology | 145.7K | $40.5M | 4.8% | -19.5% |
| ZTS ZOETIS INC | Healthcare | 318.8K | $37.7M | 4.5% | -4.4% |
| ACN ACCENTURE PLC-CL A | Services media | 173.0K | $34.3M | 4.1% | -23.6% |
| MTD METTLER-TOLEDO INTERNATIONAL | Healthcare | 22.5K | $28.4M | 3.4% | -57.5% |
| TW TRADEWEB MARKETS INC-CLASS A | Financials | 22.2K | $2.6M | 0.3% | -54.6% |
| BKNG BOOKING HOLDINGS INC | Industrials | 581 | $2.4M | 0.3% | -63.2% |
| CPRT COPART INC | Consumer discretionary | 68.9K | $2.3M | 0.3% | -50.0% |
| GGG GRACO INC | Industrials | 26.3K | $2.2M | 0.3% | -68.5% |
| ADP AUTOMATIC DATA PROCESSING | Technology | 10.8K | $2.2M | 0.3% | -57.0% |
| CME CME GROUP INC | Financials | 7.2K | $2.1M | 0.3% | -69.9% |
| MCO MOODY'S CORP | Services media | 4.7K | $2.1M | 0.2% | -66.1% |
| V VISA INC-CLASS A SHARES | Services media | 5.8K | $1.8M | 0.2% | -66.4% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | Apr 7, 2026 | 24 | $838.5M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Jan 9, 2026 | 24 | $1.29B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Oct 14, 2025 | 22 | $1.38B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Jul 7, 2025 | 22 | $1.52B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | Apr 14, 2025 | 23 | $1.53B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Jan 16, 2025 | 21 | $1.75B | canonical | SEC ↗ |
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