13D Management LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 14, 2026), 13D Management LLC reported 11 stock positions worth $71.3 million. Its top holding was Viasat (VSAT) at 15.9% of the portfolio, followed by Twilio Class A (TWLO, 11.3%) and Mercury Systems (MRCY, 10.4%). Compared with Q1 2026, it opened 1 new position, sold out of 3 and reduced 2. The biggest buy was a new position in Synopsys (SNPS) and the biggest sale an exit from Acadia Healthcare (ACHC).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001600133
- Portfolio Value
- $71.3M (Q2 2026)
- SEC Filing
- 0001172661-26-003515 ↗ filed Aug 14, 2026
Holdings Value
Holdings 11 stocks · $71.3M
| VSAT Viasat Inc. | 15.89% | 126,250 | $11.3M | Reduce -23.4% |
| TWLO Twilio Inc. Class A | 11.28% | 39,000 | $8.0M | Reduce -35.8% |
| MRCY Mercury Systems Inc. | 10.37% | 60,462 | $7.4M | No change |
| PSO Pearson PLC-Sponsored ADR | 10.21% | 458,338 | $7.3M | No change |
| ALV Autoliv Inc. | 9.09% | 55,839 | $6.5M | No change |
| CRL Charles River Laboratories | 8.20% | 25,800 | $5.9M | No change |
| SNPS Synopsys Inc. | 7.91% | 12,650 | $5.6M | New |
| EXEL Exelixis Inc. | 7.73% | 101,335 | $5.5M | No change |
| ETSY Etsy Inc. | 7.59% | 71,836 | $5.4M | No change |
| ITGR Integer Holdings Corp. | 6.16% | 47,000 | $4.4M | No change |
| FUN Six Flags Entertainment Corp. | 5.57% | 186,500 | $4.0M | No change |
Portfolio Sells Q1 2026 → Q2 2026
Portfolio Buys Q1 2026 → Q2 2026
| SNPS Synopsys Inc. | New | 7.91% | +7.91 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 11 | $71.3M | VSAT, TWLO, MRCY, PSO, ALV |
| Q1 2026 | 13 | $64.5M | TWLO, VSAT, ACHC, PSO, ALV |
| Q4 2025 | 16 | $84.0M | TWLO, MRCY, VSAT, ALV, PSO |
| Q3 2025 | 18 | $104.3M | MRCY, QRVO, VSAT, ALV, PSO |
| Q2 2025 | 20 | $109.6M | TWLO, QRVO, MRCY, SWX, PSO |
| Q1 2025 | 21 | $113.4M | MRCY, PSO, NSIT, APD, SWX |
| Q4 2024 | 21 | $135.0M | TWLO, VSTS, SWX, MRCY, PSO |
| Q3 2024 | 22 | $136.4M | FYBR, NSIT, SWX, EXEL, MDU |
| Q2 2024 | 21 | $137.1M | NSIT, FYBR, SWX, EXEL, TWLO |
| Q1 2024 | 28 | $163.8M | GDDY, SWX, NSIT, FYBR, ELAN |