Greenstone Partners & Co., LLC — 13F Holdings & Portfolio
CIK 1845565 · latest 13F-HR filed 2026-05-14
Greenstone Partners & Co., LLC manages $395.1M in 13F-reported U.S. long-equity assets across 9 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are APP (19.67%), GWRE (15.31%), AYI (12.75%). Quarter over quarter (versus its 2025-09-30 filing) the fund opened 0 new positions, exited 2, added to 5, and trimmed 3.
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.
$395.1M
Long-equity book
9
Distinct positions
2026-03-31
Filed 2026-05-14
+0 / −2 / ↑5 / ↓3
vs 2025-09-30
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- GUIDEWIRE SOFTWARE INC$31.5M +108.9%
- CHARTER COMMUNICATIONS INC$30.1M +398.6%
- VESTIS CORPORATION$25.8M +180.8%
- SOMNIGROUP INTERNATIONAL INC$19.1M +83.1%
- APPFOLIO INC$6.6M +17.9%
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 | APPLOVIN CORP | APP | 03831W108 | $77.7M | 19.67% | 195,251 | SH |
| 2 | GUIDEWIRE SOFTWARE INC | GWRE | 40171V100 | $60.5M | 15.31% | 404,319 | SH |
| 3 | ACUITY INC | AYI | 00508Y102 | $50.4M | 12.75% | 179,710 | SH |
| 4 | APPFOLIO INC | APPF | 03783C100 | $43.2M | 10.93% | 273,497 | SH |
| 5 | SOMNIGROUP INTERNATIONAL INC | SGI | 88023U101 | $42.0M | 10.63% | 568,354 | SH |
| 6 | VESTIS CORPORATION | VSTS | 29430C102 | $40.0M | 10.14% | 5,094,356 | SH |
| 7 | PROCORE TECHNOLOGIES INC | PCOR | 74275K108 | $38.3M | 9.70% | 672,423 | SH |
| 8 | CHARTER COMMUNICATIONS INC | CHTR | 16119P108 | $37.6M | 9.52% | 174,158 | SH |
| 9 | XPO INC | XPO | 983793100 | $5.4M | 1.36% | 27,715 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-03-31 | 2026-05-14 | $395.1M | 9 | 0001420506-26-000995 |
| 2025-12-31 | 2026-02-18 | $514.4M | 12 | 0001941040-26-000189 |
| 2025-09-30 | 2026-02-25 | $546.9M | 11 | 0001420506-26-000618 |