Octagon Capital Advisors LP
13F filer · CIK 1839435 · New York, NY
Summary
Octagon Capital Advisors LP reported $1.11B across 27 positions in its 13F for 2026 Q2, filed Aug 14, 2026. The largest holdings are DNTH (16.1%), DFTX (12.5%), ABVX (11.9%). Versus 2026 Q1, leaving options aside, it opened 4 new positions, added to 4, trimmed 6 and sold out of 7.
Reported value$1.11B
Positions27incl. options
Report period2026 Q2
FiledAug 14, 2026
New positions4
Added4
Trimmed6
Sold out7
Top 25 holdings
By reported value, options listed separately · change vs 2026 Q1
Weight 16.1%Value $179.53MPrice $87.16Shares 1.84M -5.39%Since Jun 30 -10.59%
Weight 12.5%Value $138.77MPrice $38.21Shares 2.95M +20.90%Since Jun 30 -18.77%
Weight 11.9%Value $132.33MPrice $98.50Shares 993K +46.68%Since Jun 30 -26.08%
Weight 8.2%Value $90.94MPrice $31.66Shares 2.35MSince Jun 30 -18.19%
Weight 7.2%Value $79.66MPrice $7.29Shares 2.83MSince Jun 30 -74.09%
Weight 6.2%Value $68.47MPrice $29.54Shares 1.97MSince Jun 30 -14.97%
Weight 5.9%Value $66.01MPrice $4.99Shares 9.69M +9.41%Since Jun 30 -26.73%
Weight 3.9%Value $42.84MPrice $7.14Shares 1.75MSince Jun 30 -70.87%
Weight 3.6%Value $39.68MPrice $87.54Shares 339KSince Jun 30 -25.22%
Weight 3.2%Value $35.55MPrice $110.51Shares 310K -27.06%Since Jun 30 -3.63%
Weight 2.8%Value $30.97MPrice $19.69Shares 961KSince Jun 30 -38.91%
Weight 2.7%Value $29.58MPrice $37.25Shares 490KSince Jun 30 -38.29%
Weight 1.9%Value $21.48MPrice $1.45Shares 10.28MSince Jun 30 -30.62%
Weight 1.8%Value $20.38MPrice $7.87Shares 2.08M -34.47%Since Jun 30 -19.86%
Weight 1.8%Value $19.75MPrice $65.87Shares 270KSince Jun 30 -9.94%
Weight 1.6%Value $18.21MPrice $16.39Shares 1.25MSince Jun 30 +12.49%
Weight 1.4%Value $15.79MPrice $31.73Shares 457K +176.80%Since Jun 30 -8.24%
Weight 1.0%Value $10.75MPrice $15.65Shares 935KSince Jun 30 +36.09%
Weight 1.0%Value $10.61MPrice $6.18Shares 1.35M -39.64%Since Jun 30 -21.37%
Weight 0.8%Value $9.42MPrice $11.55Shares 574KSince Jun 30 -29.57%
Weight 0.8%Value $9.03MPrice $28.07Shares 361KSince Jun 30 +12.28%
Weight 0.6%Value $6.29MPrice $7.32Shares 954KSince Jun 30 +11.08%
Weight 0.5%Value $5.87MPrice $14.42Shares 315K -78.79%Since Jun 30 -22.68%
Weight 0.4%Value $4.69MPrice $4.55Shares 1.00MSince Jun 30 -2.99%
Weight 0.2%Value $1.69MPrice $0.32Shares 3.05M -41.90%Since Jun 30 -42.41%
| Stock | Weight | Value | Since Jun 30 | Shares change | Action |
|---|---|---|---|---|---|
| 16.1% | $179.53M | -10.59% | -5.39% | Trim | |
| 12.5% | $138.77M | -18.77% | +20.90% | Add | |
| 11.9% | $132.33M | -26.08% | +46.68% | Add | |
| 8.2% | $90.94M | -18.19% | — | Hold | |
| 7.2% | $79.66M | -74.09% | — | Hold | |
| 6.2% | $68.47M | -14.97% | — | Hold | |
| 5.9% | $66.01M | -26.73% | +9.41% | Add | |
| 3.9% | $42.84M | -70.87% | — | Hold | |
| 3.6% | $39.68M | -25.22% | — | Hold | |
| 3.2% | $35.55M | -3.63% | -27.06% | Trim | |
| 2.8% | $30.97M | -38.91% | — | Hold | |
| 2.7% | $29.58M | -38.29% | — | Hold | |
| 1.9% | $21.48M | -30.62% | — | Hold | |
| 1.8% | $20.38M | -19.86% | -34.47% | Trim | |
| 1.8% | $19.75M | -9.94% | — | Hold | |
| 1.6% | $18.21M | +12.49% | — | New | |
| 1.4% | $15.79M | -8.24% | +176.80% | Add | |
| 1.0% | $10.75M | +36.09% | — | New | |
| 1.0% | $10.61M | -21.37% | -39.64% | Trim | |
| 0.8% | $9.42M | -29.57% | — | Hold | |
| 0.8% | $9.03M | +12.28% | — | New | |
| 0.6% | $6.29M | +11.08% | — | New | |
| 0.5% | $5.87M | -22.68% | -78.79% | Trim | |
| 0.4% | $4.69M | -2.99% | — | Hold | |
| 0.2% | $1.69M | -42.41% | -41.90% | 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
Options
Notional value, listed apart from stocks
ERASCA INCNo ticker matchCALL$22.99MNew
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.