ARDSLEY ADVISORY PARTNERS LP
SEC Form 13F institutional filer · CIK 0000900529
13F-HR · 40 reported holdings · 2026-03-31
Reported long-US-equity value
$0.29B
Top-10 concentration
61.1%
ARDSLEY ADVISORY PARTNERS LP — $286M AUM allocation strategy
ARDSLEY ADVISORY PARTNERS LP files SEC Form 13F and reports $286M of long US equity value across 40 reported holdings for 2026-03-31.
Its largest sector bet is Information Technology 40.9%, followed by Consumer Discretionary 12.2% and Communication Services 10.9%.
The top 10 holdings account for 61% 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.
ARDSLEY ADVISORY PARTNERS LP — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$286M
total across 40 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
61% of value
higher = narrower conviction; lower = spread / hedging
Biggest adds (shares)
+$ANET +73.7K sh · +$8.22M+$NOW +60.6K sh · +$5.77M+$EBAY +55.5K sh · +$5.38M
Biggest trims (shares)
−$AMAT −535K sh · +$4.88M−$LITE −73.8K sh · −$25.1M−$TXN −54K sh · −$9.24M
Exited to nil (held last quarter, gone now)
$FSLR ($30.7M last qtr)$TEL ($16.7M last qtr)$BLK ($9.79M last qtr)$CRM ($8.73M last qtr)$PANW ($7.37M last qtr)
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)
- Semiconductors18.5%—
- Broadline Retail12.2%—
- Technology Hardware, Storage & Peripherals9.3%—
- Interactive Media & Services8.6%—
- Communications Equipment7.5%—
- Asset Management & Custody Banks5.2%—
- Health Care Equipment3.3%—
- Semiconductor Materials & Equipment3.0%—
- Other holdings32.5%—
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 |
|---|---|---|---|---|---|
| $AVGO | Broadcom Inc | 89.5K | $27.7M | +5.5K | 9.7% |
| $SNDK | Sandisk Corporation | 42K | $26.7M | -14K | 9.3% |
| $AMZN | Amazon.com Inc | 106K | $22.1M | +52K | 7.7% |
| $ANET | Arista Networks Inc | 174K | $21.3M | +73.7K | 7.5% |
| $META | Meta Platforms Inc | 28K | $16M | +26K | 5.6% |
| $NVDA | NVIDIA Corporation | 87.5K | $15.3M | -37.5K | 5.3% |
| $KKR | KKR & Co. Inc | 350K | $14.9M | +0 | 5.2% |
| $EBAY | eBay Inc | 141K | $12.8M | +55.5K | 4.5% |
| $BSX | Boston Scientific Corporation | 150K | $9.41M | — | 3.3% |
| $GOOGL | Alphabet Inc | 30K | $8.61M | -27K | 3.0% |
…and 30 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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