13D Management LLC — 13F Holdings & Portfolio
CIK 1600133 · latest 13F-HR filed 2026-05-15
13D Management LLC manages $64.5M in 13F-reported U.S. long-equity assets across 13 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are TWLO (11.85%), VSAT (11.70%), ACHC (10.66%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 1 new position, exited 4, added to 3, and trimmed 9.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
$64.5M
Long-equity book
13
Distinct positions
2026-03-31
Filed 2026-05-15
+1 / −4 / ↑3 / ↓9
vs 2025-12-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- VIASAT INC$593.2K +8.5%
- INTEGER HLDGS CORP$449.8K +12.2%
- SIX FLAGS ENTERTAINMENT CORP$449.5K +15.7%
Top Trims
- MERCURY SYS INC-$3.2M -41.8%
- WORKIVA INC-$1.4M -30.9%
- TRIPADVISOR INC-$1.2M -26.8%
- CHARLES RIV LABS INTL INC-$1.1M -20.3%
- TWILIO INC-$997.6K -11.5%
Exited Positions
- SOUTHWEST GAS HLDGS INC$5.1M
- BILL HOLDINGS INC$4.9M
- WEX INC$4.4M
- LAMB WESTON HLDGS INC$3.2M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | TWILIO INC | TWLO | 90138F102 | $7.6M | 11.85% | 60,755 | SH |
| 2 | VIASAT INC | VSAT | 92552V100 | $7.5M | 11.70% | 164,750 | SH |
| 3 | ACADIA HEALTHCARE COMPANY IN | ACHC | 00404A109 | $6.9M | 10.66% | 294,000 | SH |
| 4 | PEARSON PLC | PSO | 705015105 | $6.0M | 9.33% | 458,338 | SH |
| 5 | AUTOLIV INC | ALV | 052800109 | $5.9M | 9.10% | 55,839 | SH |
| 6 | CHARLES RIV LABS INTL INC | CRL | 159864107 | $4.5M | 6.90% | 25,800 | SH |
| 7 | MERCURY SYS INC | MRCY | 589378108 | $4.4M | 6.83% | 60,462 | SH |
| 8 | EXELIXIS INC | EXEL | 30161Q104 | $4.3M | 6.74% | 101,335 | SH |
| 9 | INTEGER HLDGS CORP | ITGR | 45826H109 | $4.1M | 6.41% | 47,000 | SH |
| 10 | ETSY INC | ETSY | 29786A106 | $3.6M | 5.57% | 71,836 | SH |
| 11 | SIX FLAGS ENTERTAINMENT CORP | FUN | 83001C108 | $3.3M | 5.13% | 186,500 | SH |
| 12 | TRIPADVISOR INC | TRIP | 896945201 | $3.2M | 4.96% | 300,000 | SH |
| 13 | WORKIVA INC | WK | 98139A105 | $3.1M | 4.81% | 52,000 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-15 | $64.5M | 13 | 0001172661-26-002041 |
| 2025-12-31 | 2026-02-17 | $84.0M | 16 | 0001172661-26-000830 |
| 2025-09-30 | 2025-11-14 | $104.3M | 18 | 0001172661-25-004791 |