13D Management LLC
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 15, 2026), 13D Management LLC reported 13 stock positions worth $64.5 million. Its top holding was Twilio Class A (TWLO) at 11.9% of the portfolio, followed by Viasat (VSAT, 11.7%) and Acadia Healthcare (ACHC, 10.7%). Compared with Q4 2025, it opened 1 new position, sold out of 4 and reduced 4. The biggest buy was a new position in Acadia Healthcare (ACHC) and the biggest sale an exit from Southwest Gas (SWX).
- Most Recent 13F
- Q2 2026
- Location
- New York, NY
- CIK
- 0001600133
- Portfolio Value
- $64.5M (Q1 2026)
- SEC Filing
- 0001172661-26-002041 ↗ filed May 15, 2026
Holdings Value
Holdings 13 stocks · $64.5M
| TWLO Twilio Inc. Class A | 11.85% | 60,755 | $7.6M | No change |
| VSAT Viasat Inc. | 11.70% | 164,750 | $7.5M | Reduce -18.3% |
| ACHC Acadia Healthcare Co. Inc. | 10.66% | 294,000 | $6.9M | New |
| PSO Pearson PLC-Sponsored ADR | 9.33% | 458,338 | $6.0M | No change |
| ALV Autoliv Inc. | 9.10% | 55,839 | $5.9M | No change |
| CRL Charles River Laboratories | 6.90% | 25,800 | $4.5M | Reduce -7.9% |
| MRCY Mercury Systems Inc. | 6.83% | 60,462 | $4.4M | Reduce -41.7% |
| EXEL Exelixis Inc. | 6.74% | 101,335 | $4.3M | Reduce -15.8% |
| ITGR Integer Holdings Corp. | 6.41% | 47,000 | $4.1M | No change |
| ETSY Etsy Inc. | 5.57% | 71,836 | $3.6M | No change |
| FUN Six Flags Entertainment Corp. | 5.13% | 186,500 | $3.3M | No change |
| TRIP Tripadvisor Inc. | 4.96% | 300,000 | $3.2M | No change |
| WK Workiva Inc. | 4.81% | 52,000 | $3.1M | No change |
Portfolio Sells Q4 2025 → Q1 2026
| SWX Southwest Gas Holdings Inc. | Sold out | 0.00% | −6.07 |
| BILL Bill Holdings Inc. | Sold out | 0.00% | −5.84 |
| WEX Wex Inc. | Sold out | 0.00% | −5.20 |
| LW Lamb Weston Holdings Inc. | Sold out | 0.00% | −3.79 |
| MRCY Mercury Systems Inc. | Reduce -41.7% | 6.83% | −2.18 |
| CRL Charles River Laboratories | Reduce -7.9% | 6.90% | +0.25 |
| EXEL Exelixis Inc. | Reduce -15.8% | 6.74% | +0.46 |
| VSAT Viasat Inc. | Reduce -18.3% | 11.70% | +3.43 |
Portfolio Buys Q4 2025 → Q1 2026
| ACHC Acadia Healthcare Co. Inc. | New | 10.66% | +10.66 |
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 |