Impax Asset Management
Impax Asset Management · SEC CIK 1749768
The transition to a sustainable economy.
This filing is 158 days old. Impax Asset Management keeps roughly 90% of its positions in a typical quarter, so about 84% of this book is likely still intact today.
How half-life is computedSnapshot half-life is the number of days after the period end at which half of this specific fund's reported book is expected to have changed, measured from its own past filings. It is a decay estimate, not knowledge of current positions.
Largest holdings, as filed
Top 10 of 287 positions. Weights are against the whole filed book. 13F filings cover US-listed holdings only.
| Company | Ticker | Value | % of book | Freshness |
|---|---|---|---|---|
| Linde PLC | $848.63M | 5.9% | n/a | |
| NVIDIA Corp | NVDA | $635.01M | 4.4% | |
| Xylem Inc/NY | XYL | $547.97M | 3.8% | |
| KLA Corp | KLAC | $535.65M | 3.7% | |
| Microsoft Corp | MSFT | $440.09M | 3.1% | |
| American Water Works Co Inc | AWK | $383.40M | 2.7% | |
| Waste Connections Inc | WCN | $343.95M | 2.4% | |
| Hubbell Inc | HUBB | $335.06M | 2.3% | |
| Aptiv PLC | $318.84M | 2.2% | n/a | |
| Veralto Corp | VLTO | $298.51M | 2.1% |
Freshness: how likely each position is still held today, from this fund's own turnover history, each position's tenure and the filing's age. Hover a bar for the numbers. Method.
What changed last quarter
Between Q1 2026 and Q1 2026, the largest add was KLAC (shares up 582%), now $749.01M; the largest trim was XYL (shares down 6%). All of it computed from the two filings, nothing inferred.
Biggest buys, Q1 2026
Exited since Q1 2026
None of the previous quarter's 40 largest positions disappeared from the latest filing.
Exit scan covers the previous quarter's 40 largest positions, a stated bound, because reading a mega fund's entire book per page render is not honest engineering.
Common questions
What are Impax Asset Management's biggest holdings?
As of the Q1 2026 13F, the largest reported positions at Impax Asset Management are Linde PLC (5.9% of the book), NVDA (4.4% of the book), XYL (3.8% of the book).
How big is Impax Asset Management's portfolio?
The latest 13F reports $14.35B across 287 US-listed positions. 13F filings cover US-listed holdings only, so non-US positions and shorts are not included.
Does Impax Asset Management still hold these positions?
Unknown for certain: a 13F may be filed up to 45 days after quarter end. Based on Impax Asset Management's own filing history, the fund keeps roughly 90% of positions in a typical quarter, so at 158 days since the period end roughly 84% of this book is likely intact. The snapshot half-life for this fund is about 615 days.
What did Impax Asset Management buy and sell last quarter?
Between Q1 2026 and Q1 2026, the largest add was KLAC (shares up 582%), now $749.01M; the largest trim was XYL (shares down 6%). All of it computed from the two filings, nothing inferred.
Funds with overlapping books
Inside the app: the full book for Impax Asset Management, quarter on quarter buys and sells, consensus across 140+ funds and copy-to-watchlist.
Source: SEC EDGAR 13F filings. Values are as filed and cover US-listed positions only. A 13F may be filed up to 45 days after the quarter ends, so positions can change before the filing is even public; the freshness figures above quantify that lag instead of hiding it. Educational information, not financial advice.