Rubicon Founders LLC
Long book
$137.6M
Q1 2026
Positions
3
Top-10 weight
100%
concentration
Last quarter
+44.5%
SPY +14.8%
Turnover
0%
of book per quarter
Strategy in plain words
auto-generated from filingsRubicon Founders LLC is a diversified fundamental manager, specialised in healthcare (90% of the long book), running a $137.6M US long book across 3 positions.
The portfolio is extremely concentrated — the top 10 positions are almost the whole book. The book barely moves quarter to quarter — a patient, low-turnover holder. Current anchor positions: PRIVIA HEALTH GROUP INC, EVOLENT HEALTH INC - A, GILON HEALTH INC.
Over the last 9 quarters its long book ran on average 1.6pp per quarter behind the S&P 500, beating the index in 3 of 9 quarters. We rate its filings as signal-bearing: position changes reflect genuine views.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-11.3%
Q2 2024
+4.8%
Q3 2024
+7.4%
Q4 2024
+14.8%
Q1 2025
+3.2%
Q2 2025
-2.7%
Q3 2025
-17.0%
Q4 2025
-17.6%
Q1 2026
+44.5%
Sector allocation
Healthcare 90%
Services media 10%
Long book by quarter
What does Rubicon Founders own?
Q1 2026 13F13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 15, 2026 | 3 | $137.6M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR/ANEW HOLDINGS | May 15, 2026 | 1 | $4.3M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 17, 2026 | 2 | $160.2M | confidential canonical | SEC ↗ |
| Q3 2025 | 13F-HR/ANEW HOLDINGS | May 15, 2026 | 1 | $6.5M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 14, 2025 | 2 | $193.0M | confidential canonical | SEC ↗ |
| Q2 2025 | 13F-HR/ANEW HOLDINGS | May 15, 2026 | 1 | $14.5M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR/ANEW HOLDINGS | Nov 17, 2025 | 1 | $65.5M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 1 | $132.8M | confidential canonical | SEC ↗ |
| Q1 2025 | 13F-HR/ANEW HOLDINGS | May 15, 2026 | 1 | $26.8M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR/ANEW HOLDINGS | Nov 17, 2025 | 1 | $6.2M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 15, 2025 | 1 | $129.6M | confidential canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 12, 2025 | 1 | $112.9M | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 14, 2024 | 1 | $105.1M | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Nov 14, 2024 | 1 | $100.3M | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | Nov 14, 2024 | 1 | $102.1M | canonical | SEC ↗ |