Seilern Investment Management Ltd
SEC Form 13F institutional filer · CIK 0001817797
13F-HR · 22 reported holdings · 2026-03-31
Seilern Investment Management Ltd is a Swiss asset manager.
Reported long-US-equity value
$0.83B
Top-10 concentration
71.0%
Seilern Investment Management Ltd — $834M AUM allocation strategy
Seilern Investment Management Ltd files SEC Form 13F and reports $834M of long US equity value across 22 reported holdings for 2026-03-31.
Its largest sector bet is Health Care 48.1%, followed by Information Technology 33.3% and Financials 10.9%.
The top 10 holdings account for 71% of reported value — a conviction-weighted book concentrated in its best ideas. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.
Seilern Investment Management Ltd — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$834M
total across 22 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
71% of value
higher = narrower conviction; lower = spread / hedging
Biggest trims (shares)
−$EW −233K sh · −$23.4M−$GOOG −83.9K sh · −$31M−$UNH −74.8K sh · −$41.4M
Added from nil (new positions)
None this quarter
Exited to nil (held last quarter, gone now)
None this quarter
Sector allocation (share of reported value)
each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Industry allocation (share of reported value)
- Application Software23.4%—
- Health Care Equipment17.5%—
- Transaction & Payment Processing Services10.7%—
- Managed Health Care9.2%—
- Health Care Supplies6.8%—
- Health Care Technology6.7%—
- Interactive Media & Services6.4%—
- Systems Software5.9%—
- Other holdings13.6%—
the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Top S&P 500 holdings
10 of 10 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $MA | Mastercard Incorporated | 178K | $88.9M | -41.2K | 10.7% |
| $UNH | UnitedHealth Group Incorporated | 281K | $76.1M | -74.8K | 9.1% |
| $TYL | Tyler Technologies Inc | 182K | $62.4M | +31.2K | 7.5% |
| $WST | West Pharmaceutical Services Inc | 226K | $56.6M | -52.2K | 6.8% |
| $VEEV | Veeva Systems Inc | 316K | $55.6M | +2.45K | 6.7% |
| $EW | Edwards Lifesciences Corporation | 690K | $55.3M | -233K | 6.6% |
| $GOOG | Alphabet Inc. Class C Capital Stock | 185K | $53.3M | -83.9K | 6.4% |
| $ADSK | Autodesk Inc | 205K | $49.1M | -31.9K | 5.9% |
| $MSFT | Microsoft Corporation | 132K | $48.8M | -52K | 5.9% |
| $IDXX | IDEXX Laboratories Inc | 80.8K | $45.4M | -20K | 5.4% |
…and 12 more holdings in the full 13F filing (top positions only shown).
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
← All 13F filers·← QuantOrb.pro
How to read Δ QoQ — the five insight categories, and the caveats
The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.
Conviction & concentration shifts
New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.
Sector & macro allocation rotations
Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.
Crowding & smart-money consensus
When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.
Derivative & option overlays
Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.
Who reads this
| Retail "cloners" | High-conviction ideas to replicate ~45 days after quarter-end. |
| Corporate IR | Which funds bought or dumped the stock, before the next call. |
| Quant / algo traders | Cross-sectional factor inputs: flow, momentum, ownership. |
Four caveats before you trade on it
- 45-day lag — holdings are quarter-end; positions may already be closed.
- Long-only — 13Fs miss shorts, pair trades and cash.
- No non-US / fixed income — the picture is US equities plus options.
- Corporate actions — splits and spinoffs distort raw share deltas.
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