Alta Partners Management Company, L.P.
Long book
$151.0M
Q1 2026
Positions
2
Top-10 weight
100%
concentration
Last quarter
-19.1%
SPY +14.8%
Turnover
0%
of book per quarter
Strategy in plain words
auto-generated from filingsAlta Partners Management Company, L.P. is a diversified fundamental manager, specialised in healthcare (100% of the long book), running a $151.0M US long book across 2 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: TYRA BIOSCIENCES INC, VIR BIOTECHNOLOGY INC.
Over the last 6 quarters its long book ran on average 16pp per quarter ahead of the S&P 500, beating the index in 3 of 6 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
Q4 2024
-31.8%
Q1 2025
+0.9%
Q2 2025
+44.2%
Q3 2025
+83.9%
Q4 2025
+45.8%
Q1 2026
-19.1%
Sector allocation
Healthcare 100%
Long book by quarter
What does Alta Partners own?
Q1 2026 13F13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | Apr 21, 2026 | 2 | $151.0M | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Jan 13, 2026 | 2 | $103.6M | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 7, 2025 | 2 | $60.0M | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Aug 14, 2025 | 2 | $41.6M | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 12, 2025 | 3 | $41.8M | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 5, 2025 | 3 | $63.4M | canonical | SEC ↗ |