GAGNON SECURITIES LLC
13F filer · CIK 1125725 · New York, NY
Summary
GAGNON SECURITIES LLC reported $507.13M across 82 positions in its 13F for 2026 Q2, filed Aug 5, 2026. The largest holdings are CDNA (10.0%), WGS (7.1%), ENSG (5.5%). Versus 2026 Q1, leaving options aside, it opened 3 new positions, added to 25, trimmed 46 and sold out of 6.
Reported value$507.13M
Positions82
Report period2026 Q2
FiledAug 5, 2026
New positions3
Added25
Trimmed46
Sold out6
Top 25 holdings
By reported value, options listed separately · change vs 2026 Q1
Weight 10.0%Value $50.47MPrice $64.02Shares 1.77M +0.50%Since Jun 30 +124.63%
Weight 7.1%Value $36.03MPrice $75.79Shares 525K +73.14%Since Jun 30 +10.40%
Weight 5.5%Value $27.88MPrice $175.53Shares 174K -3.21%Since Jun 30 +9.50%
Weight 4.5%Value $22.81MPrice $21.03Shares 827K -1.61%Since Jun 30 -23.80%
Weight 4.2%Value $21.42MPrice $212.22Shares 73K -2.33%Since Jun 30 -27.52%
Weight 3.7%Value $18.77MPrice $36.02Shares 511K -0.72%Since Jun 30 -2.01%
Weight 3.6%Value $18.05MPrice $10.60Shares 1.03M +155.47%Since Jun 30 -39.51%
Weight 3.5%Value $17.64MPrice $107.35Shares 222K -1.45%Since Jun 30 +34.96%
Weight 3.4%Value $17.43MPrice $1015Shares 17K -1.36%Since Jun 30 -2.60%
Weight 3.4%Value $17.21MPrice $59.23Shares 325K +5.07%Since Jun 30 +11.99%
Weight 3.1%Value $15.83MPrice $12.58Shares 1.56M -9.67%Since Jun 30 +24.31%
Weight 3.0%Value $15.44MPrice $25.65Shares 609K -1.44%Since Jun 30 +1.10%
Weight 3.0%Value $15.41MPrice $34.01Shares 723K +16.18%Since Jun 30 +59.52%
Weight 3.0%Value $15.19MPrice $95.21Shares 183K +47.25%Since Jun 30 +14.71%
Weight 3.0%Value $15.13MPrice $39.22Shares 536K -0.11%Since Jun 30 +38.88%
Weight 2.6%Value $13.03MPrice $5.72Shares 1.96M +0.81%Since Jun 30 -13.98%
Weight 2.5%Value $12.51MPrice $31.16Shares 367K +35.19%Since Jun 30 -8.59%
Weight 2.4%Value $12.06MPrice $4.62Shares 3.03M -41.76%Since Jun 30 +16.08%
Weight 2.3%Value $11.59MPrice $412.18Shares 29K -7.83%Since Jun 30 +3.65%
Weight 2.1%Value $10.55MPrice $26.37Shares 376K +26.77%Since Jun 30 -6.06%
Weight 1.9%Value $9.74MPrice $5.22Shares 1.54M -17.51%Since Jun 30 -17.67%
Weight 1.9%Value $9.48MPrice $95.46Shares 116K +4.86%Since Jun 30 +17.11%
Weight 1.7%Value $8.74MPrice $11.15Shares 761K +62.54%Since Jun 30 -2.87%
Weight 1.6%Value $8.07MPrice $13.64Shares 1.06M -0.41%Since Jun 30 +78.30%
Weight 1.5%Value $7.74MPrice $52.24Shares 211K -4.14%Since Jun 30 +42.65%
| Stock | Weight | Value | Since Jun 30 | Shares change | Action |
|---|---|---|---|---|---|
| 10.0% | $50.47M | +124.63% | +0.50% | Add | |
| 7.1% | $36.03M | +10.40% | +73.14% | Add | |
| 5.5% | $27.88M | +9.50% | -3.21% | Trim | |
| 4.5% | $22.81M | -23.80% | -1.61% | Trim | |
| 4.2% | $21.42M | -27.52% | -2.33% | Trim | |
| 3.7% | $18.77M | -2.01% | -0.72% | Trim | |
| 3.6% | $18.05M | -39.51% | +155.47% | Add | |
| 3.5% | $17.64M | +34.96% | -1.45% | Trim | |
| 3.4% | $17.43M | -2.60% | -1.36% | Trim | |
| 3.4% | $17.21M | +11.99% | +5.07% | Add | |
| 3.1% | $15.83M | +24.31% | -9.67% | Trim | |
| 3.0% | $15.44M | +1.10% | -1.44% | Trim | |
| 3.0% | $15.41M | +59.52% | +16.18% | Add | |
| 3.0% | $15.19M | +14.71% | +47.25% | Add | |
| 3.0% | $15.13M | +38.88% | -0.11% | Trim | |
| 2.6% | $13.03M | -13.98% | +0.81% | Add | |
| 2.5% | $12.51M | -8.59% | +35.19% | Add | |
| 2.4% | $12.06M | +16.08% | -41.76% | Trim | |
| 2.3% | $11.59M | +3.65% | -7.83% | Trim | |
| 2.1% | $10.55M | -6.06% | +26.77% | Add | |
| 1.9% | $9.74M | -17.67% | -17.51% | Trim | |
| 1.9% | $9.48M | +17.11% | +4.86% | Add | |
| 1.7% | $8.74M | -2.87% | +62.54% | Add | |
| 1.6% | $8.07M | +78.30% | -0.41% | Trim | |
| 1.5% | $7.74M | +42.65% | -4.14% | Trim |
Weight is the share of the reported 13F value, including options at notional value. “Since Jun 30” compares the latest close with the quarter-end price implied by the filing (value ÷ shares).
Largest buys in 2026 Q2
Largest sells in 2026 Q2
Source: SEC Form 13F, values as reported by the filer. Filings lag up to 45 days after quarter end and cover only certain long positions. Research only, not investment advice.