Greenstone Partners & Co., LLC
Long book
$395.1M
Q1 2026
Positions
9
Top-10 weight
100%
concentration
Last quarter
+12.7%
SPY +14.8%
Turnover
25%
of book per quarter
Strategy in plain words
auto-generated from filingsGreenstone Partners & Co., LLC is a concentrated fundamental stock-picker, running a $395.1M US long book across 9 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. Turnover is modest: positions are typically held for years. Current anchor positions: APPLOVIN CORP-CLASS A, GUIDEWIRE SOFTWARE INC, ACUITY INC, APPFOLIO INC - A, SOMNIGROUP INTERNATIONAL INC.
Over the last 9 quarters its long book ran on average 7.8pp per quarter ahead of the S&P 500, beating the index in 4 of 9 quarters. We rate its filings highest-signal: new buys here are worth attention.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
+4.3%
Q2 2024
+22.4%
Q3 2024
+63.7%
Q4 2024
-12.3%
Q1 2025
+19.1%
Q2 2025
+27.2%
Q3 2025
-4.5%
Q4 2025
-22.1%
Q1 2026
+12.7%
Sector allocation
Technology 56%
Industrials 14%
Other 11%
Consumer discretionary 10%
Communications 10%
Long book by quarter
What does Greenstone Partners own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| APP APPLOVIN CORP-CLASS A | Technology | 195.3K | $77.7M | 19.7% | Held |
| GWRE GUIDEWIRE SOFTWARE INC | Technology | 404.3K | $60.5M | 15.3% | +117.4% |
| AYI ACUITY INC | Industrials | 179.7K | $50.4M | 12.7% | -6.8% |
| APPF APPFOLIO INC - A | Technology | 273.5K | $43.2M | 10.9% | +45.8% |
| SGI SOMNIGROUP INTERNATIONAL INC | Other | 568.4K | $42.0M | 10.6% | +8.1% |
| VSTS VESTIS CORP | Consumer discretionary | 5.1M | $40.0M | 10.1% | Held |
| PCOR PROCORE TECHNOLOGIES INC | Technology | 672.4K | $38.3M | 9.7% | +28.6% |
| CHTR CHARTER COMMUNICATIONS INC-A | Communications | 174.2K | $37.6M | 9.5% | +3896.3% |
| XPO XPO INC | Industrials | 27.7K | $5.4M | 1.4% | -85.7% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 14, 2026 | 9 | $395.1M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 18, 2026 | 12 | $514.4M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Feb 25, 2026 | 11 | $546.9M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 11 | $426.8M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 14, 2025 | 10 | $376.7M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 14, 2025 | 9 | $426.2M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 14, 2024 | 9 | $286.6M | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 13, 2024 | 9 | $239.4M | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 9, 2024 | 9 | $222.8M | canonical | SEC ↗ |
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