Seilern Investment Management
Peter SeilernLONDON, X0files as Seilern Investment Management Ltd
$794m in 24 US stocks at the end of 30 June 2026. The top 10 are 69.2% of the money. It changed about 6.6% of the portfolio this quarter.
Value
$794m
Stocks
24
Top 10 share
69.2%
Turnover
6.6%
What changed this quarter
New
Bought for the first time this quarter.
None this quarter.
Added
Bought more of a stock they already held.
- Idexx LaboratoriesIDXX6.5% of the fund+21%
- Intuitive SurgicalISRG5.8% of the fund+18%
- AutodeskADSK5.6% of the fund+11%
- ZoetisZTS4.2% of the fund+44%
- CopartCPRT3.7% of the fund+1429%
Cut
Sold some of their stake.
- MastercardMA11.0% of the fund-5%
- UnitedHealth GroupUNH8.4% of the fund-43%
- Edwards LifesciencesEW6.8% of the fund-13%
- Tyler TechnologiesTYL6.4% of the fund-5%
- West Pharmaceutical ServicesWST6.3% of the fund-39%
- AlphabetGOOGL5.5% of the fund-35%
- MicrosoftMSFT5.4% of the fund-13%
- Cadence Design SystemsCDNS5.4% of the fund-22%
- Mettler Toledo InternationalMTD3.4% of the fund-7%
- AccentureACN2.6% of the fund-5%
- Booking HoldingsBKNG0.3% of the fund-15%
- Tradeweb MarketsTW0.2% of the fund-12%
- VisaV0.2% of the fund-3%
- Automatic Data ProcessingADP0.2% of the fund-22%
- Moody'sMCO0.2% of the fund-23%
- GracoGGG0.2% of the fund-36%
- CME GroupCME0.1% of the fund-47%
Sold out
Sold their entire stake.
None this quarter.
Holdings
| Company | Share of fund | Value | Shares | Change |
|---|---|---|---|---|
| MastercardMA | 11.0% | $87m | 169,410 | -5% |
| UnitedHealth GroupUNH | 8.4% | $67m | 160,023 | -43% |
| Veeva SystemsVEEV | 7.1% | $56m | 317,032 | Held |
| Edwards LifesciencesEW | 6.8% | $54m | 600,231 | -13% |
| Idexx LaboratoriesIDXX | 6.5% | $51m | 97,560 | +21% |
| Tyler TechnologiesTYL | 6.4% | $51m | 173,172 | -5% |
| West Pharmaceutical ServicesWST | 6.3% | $50m | 138,230 | -39% |
| Intuitive SurgicalISRG | 5.8% | $46m | 115,695 | +18% |
| AutodeskADSK | 5.6% | $44m | 227,675 | +11% |
| AlphabetGOOGL | 5.5% | $43m | 121,426 | -35% |
| MicrosoftMSFT | 5.4% | $43m | 115,127 | -13% |
| Cadence Design SystemsCDNS | 5.4% | $43m | 114,321 | -22% |
| AdobeADBE | 4.6% | $37m | 179,896 | Held |
| ZoetisZTS | 4.2% | $33m | 460,006 | +44% |
| CopartCPRT | 3.7% | $30m | 1,052,697 | +1429% |
| Mettler Toledo InternationalMTD | 3.4% | $27m | 21,057 | -7% |
| AccentureACN | 2.6% | $20m | 163,642 | -5% |
| Booking HoldingsBKNG | 0.3% | $2m | 12,358 | -15% |
| Tradeweb MarketsTW | 0.2% | $2m | 19,488 | -12% |
| VisaV | 0.2% | $2m | 5,621 | -3% |
| Automatic Data ProcessingADP | 0.2% | $2m | 8,408 | -22% |
| Moody'sMCO | 0.2% | $2m | 3,630 | -23% |
| GracoGGG | 0.2% | $1m | 16,788 | -36% |
| CME GroupCME | 0.1% | $839,154 | 3,800 | -47% |
Over time and by industry
Value over time
Jun '25
Dec '25
Jun '26
Value is down 47.6% since 30 June 2025.
Where the money is
Health care48.4%
Technology30.0%
Financial services11.8%
Media & telecom5.5%
Industrials4.1%
Retail & consumer0.3%
From the fund's 13F filings. They list US stocks and options only, 45 days after each quarter, and leave out cash, bonds, shorts and foreign shares.