Rock Springs Capital Management LP
SEC Form 13F institutional filer · CIK 0001595725
13F-HR · 12 reported holdings · 2026-03-31
Reported long-US-equity value
$0.28B
Top-10 concentration
98.1%
Rock Springs Capital Management LP — $276M AUM allocation strategy
Rock Springs Capital Management LP files SEC Form 13F and reports $276M of long US equity value across 12 reported holdings for 2026-03-31.
Its largest sector bet is Health Care 83.9%, followed by Financials 16.1%.
The top 10 holdings account for 98% 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.
Rock Springs Capital Management LP — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$276M
total across 12 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
98% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$BSX +116K sh · −$5.71M+$UNH +12.2K sh · +$873K+$DXCM +8.3K sh · −$719K
Biggest trims (shares)
−$EW −53.6K sh · −$4.72M−$BNY −9.5K sh · +$979K−$LLY −6.7K sh · −$22.5M
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)
- Health Care Equipment36.1%—
- Pharmaceuticals32.8%—
- Asset Management & Custody Banks16.1%—
- Life Sciences Tools & Services6.0%—
- Managed Health Care5.2%—
- Biotechnology2.8%—
- Health Care Services1.0%—
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 |
|---|---|---|---|---|---|
| $LLY | Eli Lilly and Company | 98.7K | $90.8M | -6.7K | 32.8% |
| $BNY | The Bank of New York Mellon Corporation | 194K | $44.4M | -9.5K | 16.1% |
| $ISRG | Intuitive Surgical Inc | 82K | $37.8M | +0 | 13.7% |
| $BSX | Boston Scientific Corporation | 515K | $32.3M | +116K | 11.7% |
| $DXCM | DexCom Inc | 356K | $22.3M | +8.3K | 8.1% |
| $UNH | UnitedHealth Group Incorporated | 53K | $14.3M | +12.2K | 5.2% |
| $DHR | Danaher Corporation | 61.5K | $11.7M | +0 | 4.2% |
| $REGN | Regeneron Pharmaceuticals Inc | 10.1K | $7.8M | +0 | 2.8% |
| $TMO | Thermo Fisher Scientific Inc | 10K | $4.92M | +0 | 1.8% |
| $SYK | Stryker Corporation | 14.8K | $4.86M | — | 1.8% |
…and 2 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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