Greenstone Partners & Co., LLC — 13F Holdings & Portfolio
CIK 1845565 · latest 13F-HR filed 2026-08-14
Greenstone Partners & Co., LLC manages $432.6M in 13F-reported U.S. long-equity assets across 8 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are APP (23.25%), VSTS (17.10%), AYI (15.65%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 0 new positions and exited 1; 4 existing positions rose in reported value and 3 fell.
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.
Long-equity book
Distinct positions
Filed 2026-08-14
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.
Sector mix
% of 13F valueSectors from each company's SIC code; funds and ETFs grouped separately.
Biggest buys and sells
Q1 26 → Q2 26Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.
13F assets and positions
4 quartersTotal reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.
Top positions over time
reported valueThe eight largest current positions, valued at each quarter end.
Concentration
top 10 = 100%Cumulative share of the portfolio held in the largest N positions.
As of the firm’s regulatory filing dated Jun 12, 2026.
SUITE 300
LARKSPUR, CA 94939
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| KAZMIEROWSKI, AILEEN, HENRY Control | CHIEF FINANCIAL OFFICER & CHIEF COMPLIANCE OFFICER since May 2024 | Less than 5% | Individual |
| THE GREGORY AND VIRGINIA TUSHER TRUST, DATED APRIL 4, 2001 Control | MEMBER since Jun 2005 | 75% or more | Domestic Entity |
| TUSHER, GREGORY, MALCOLM Control | MANAGER since May 2005 | Less than 5% | Individual |
| TUSHER, GREGORY, MALCOLM Control Indirect owner via THE GREGORY AND VIRGINIA TUSHER TRUST, DATED APRIL 4, 2001 | TRUSTEE since Apr 2001 | General partner, trustee or manager | Individual |
Ownership & leadership changes · 5 filings with changes since May 15, 2014
From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.
- ChangedTUSHER, GREGORY, MALCOLM · ownership 75% or more → Less than 5%
- No longer listedBothelio, Zachary · CHIEF COMPLIANCE OFFICER; CHIEF FINANCIAL OFFICER · Less than 5% · control person · listed since Aug 2022
- AddedKAZMIEROWSKI, AILEEN, HENRY · CHIEF FINANCIAL OFFICER & CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- No longer listedRONCES, BETHY · CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Oct 2021
- AddedTHE GREGORY AND VIRGINIA TUSHER TRUST, DATED APRIL 4, 2001 · MEMBER · 75% or more · control person
- AddedTUSHER, GREGORY, MALCOLM · TRUSTEE · General partner, trustee or manager · indirect via THE GREGORY AND VIRGINIA TUSHER TRUST, DATED APRIL 4, 2001 · control person
- ChangedTUSHER, GREGORY, MALCOLM · title MANAGING MEMBER → MANAGER
- AddedBothelio, Zachary · CHIEF COMPLIANCE OFFICER; CHIEF FINANCIAL OFFICER · Less than 5% · control person
- AddedRONCES, BETHY · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ChangedTUSHER, GREGORY, MALCOLM · title MANAGING MEMBER, CHIEF COMPLIANCE OFFICER → MANAGING MEMBER
- ListedTUSHER, GREGORY, MALCOLM · MANAGING MEMBER, CHIEF COMPLIANCE OFFICER · 75% or more · control person
Quarter-over-quarter changes
Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.
Top Adds (vs prior quarter)
- VESTIS CORPORATION$33.9M +84.7%
- APPLOVIN CORP$22.9M +29.5%
- ACUITY INC$17.3M +34.4%
- SOMNIGROUP INTERNATIONAL INC$2.6M +6.1%
Top Trims
- CHARTER COMMUNICATIONS INC-$12.8M -34.1%
- PROCORE TECHNOLOGIES INC-$11.0M -28.7%
- GUIDEWIRE SOFTWARE INC-$10.7M -17.7%
Greenstone Partners & Co., LLC Holdings (2026-06-30)
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 | $100.6M | 23.25% | 195,251 | SH |
| 2 | VESTIS CORPORATION | VSTS | 29430C102 | $74.0M | 17.10% | 5,094,356 | SH |
| 3 | ACUITY INC | AYI | 00508Y102 | $67.7M | 15.65% | 179,710 | SH |
| 4 | GUIDEWIRE SOFTWARE INC | GWRE | 40171V100 | $49.8M | 11.51% | 404,584 | SH |
| 5 | SOMNIGROUP INTERNATIONAL INC | SGI | 88023U101 | $44.6M | 10.31% | 568,634 | SH |
| 6 | APPFOLIO INC | APPF | 03783C100 | $43.9M | 10.14% | 273,617 | SH |
| 7 | PROCORE TECHNOLOGIES INC | PCOR | 74275K108 | $27.3M | 6.32% | 672,813 | SH |
| 8 | CHARTER COMMUNICATIONS INC | CHTR | 16119P108 | $24.8M | 5.73% | 174,167 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $432.6M | 8 | 0001420506-26-001719 |
| 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 |
LARKSPUR, CA 94939