Impax Asset Management Group plc — 13F Holdings & Portfolio
CIK 1749768 · latest 13F-HR filed 2026-08-11
Impax Asset Management Group plc manages $15.37B in 13F-reported U.S. long-equity assets across 284 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are KLAC (4.87%), NVDA (4.85%), LIN (4.79%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 9 new positions and exited 12; 150 existing positions rose in reported value and 67 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.
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AUM
$15.37B
Long-equity book
Holdings
284
Distinct positions
Period
2026-06-30
Filed 2026-08-11
Q/Q Activity
+9 / −12 / ↑150 / ↓67
vs 2026-03-31
Portfolio charts
Latest quarter's book, what changed, and how the portfolio has evolved across filings.
Portfolio map
Q2 26KLAC4.9% · +582%NVDA4.8% · +2%LIN4.8% · -17%XYL3.4% · -2%MSFT3.3% · +14%AWK3.1% · +27%VLTO3.0% · +54%CTAS2.7% · +60%WCN2.1% · -6%SBS2.0% · +676%WMS1.9% · -4%ECL1.8% · +15%HUBB1.7% · -29%APTV1.6% · -11%VRT1.6% · -33%A1.4% · -9%IEX1.4% · +2%WTS1.4% · -8%APH1.4% · +247%CNM1.3% · +47%MRVL1.3% · -72%RNR1.3% · -4%AOS1.1% · -34%AMAT1.1% · -6%ITRI1.1% · -12%MAS1.1% · -14%MA1.1% · +14%CDNS1.0% · -28%PNR1.0% · +22%TEL1.0% · +2%WAB1.0% · +76%ACM1.0% · +54%SNPS1.0% · +6%DE0.9% · +1142%BMI0.9% · newZWS0.9% · +1%VMI0.8% · -0%FELE0.8% · -9%UNP0.8% · -39%PNFP0.8% · +176%TTEK0.7% · +3%AAPL0.7% · -14%NEE0.7% · +2495%QXO0.7% · +24%TT0.6% · -12%ADSK0.6% · +53%SITE0.6% · +2%LFUS0.6% · -43%MPWR0.6% · -28%CFG0.5% · -13%MWA0.5% · +1%GNRC0.5% · -24%CARR0.4% · -22%TREX0.4% · -26%NXT0.4% · +187%TMO0.4% · +1%GOOGL0.4% · -16%ISRG0.4% · +7%MRSH0.4% · +1%ORA0.4% · -29%
Box 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
6 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 = 34.1%Cumulative share of the portfolio held in the largest N positions.
Firm Profile & Key People
As of the firm’s regulatory filing dated Oct 26, 2026.
Assets Under Management
$25.84B
Discretionary
$24.45B
Employees
165
Accounts
686
Address
7TH FLOOR
30 PANTON STREET
LONDON SW1Y 4AJ
United Kingdom
30 PANTON STREET
LONDON SW1Y 4AJ
United Kingdom
Phone
011 44 20 3912 3000
| Name | Title / Status | Ownership | Type |
|---|---|---|---|
| BOESE, JOHN, AQUINAS Control | CHIEF COMPLIANCE OFFICER since Nov 2020 | Less than 5% | Individual |
| Cockburn, Karen Control | DIRECTOR, CHIEF FINANCIAL OFFICER since Dec 2022 | Less than 5% | Individual |
| IMPAX ASSET MANAGEMENT GROUP PLC Control | PARENT since Jun 1998 | 75% or more | Foreign Entity |
| Johnson, Darren, Michael Control | GLOBAL CHIEF OPERATING OFFICER since Aug 2023 | Less than 5% | Individual |
| SIMM, IAN, RICHARD Control | DIRECTOR, CHIEF EXECUTIVE OFFICER since Aug 1998 | Less than 5% | Individual |
Ownership & leadership changes · 18 filings with changes since Dec 22, 2011
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.
Dec 22, 2025 filing
- AddedJohnson, Darren, Michael · GLOBAL CHIEF OPERATING OFFICER · Less than 5% · control person
Dec 20, 2024 filing
- No longer listedBremner, Catherine, Mary · DIRECTOR, CHIEF STRATEGY OFFICER · Less than 5% · control person · listed since Feb 2022
- No longer listedJENKYN-JONES, BRUCE · DIRECTOR · Less than 5% · control person · listed since Jun 2001
- No longer listedvon Preyss, Daniel, Gunter · DIRECTOR · Less than 5% · control person · listed since Mar 2020
Dec 19, 2023 filing
- No longer listedALEXANDER, MARY, PATRICIA · DIRECTOR · Less than 5% · control person · listed since Jan 2023
- ChangedBremner, Catherine, Mary · title DIRECTOR, CHIEF STRATEGY AND OPERATIONS OFFICER → DIRECTOR, CHIEF STRATEGY OFFICER
Jan 18, 2023 filing
- AddedALEXANDER, MARY, PATRICIA · DIRECTOR · Less than 5% · control person
Dec 13, 2022 filing
- No longer listedRIDGE, CHARLES, DAVID · DIRECTOR, CHIEF FINANCIAL OFFICER · Less than 5% · control person · listed since Aug 2013
- AddedCockburn, Karen · DIRECTOR, CHIEF FINANCIAL OFFICER · Less than 5% · control person
Apr 12, 2022 filing
- AddedBremner, Catherine, Mary · DIRECTOR, CHIEF STRATEGY AND OPERATIONS OFFICER · Less than 5% · control person
Dec 23, 2021 filing
- ChangedSIMM, IAN, RICHARD · title DIRECTOR → DIRECTOR, CHIEF EXECUTIVE OFFICER
Mar 12, 2021 filing
- No longer listedKEEFE, JOSEPH, FRANCIS · DIRECTOR · Less than 5% · control person · listed since Feb 2018
Dec 24, 2020 filing
- No longer listedFALCONER, KEITH · DIRECTOR · Less than 5% · control person · listed since Feb 2004
- AddedBOESE, JOHN, AQUINAS · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ChangedRIDGE, CHARLES, DAVID · title DIRECTOR, CHIEF COMPLIANCE OFFICER AND CHIEF FINANCIAL OFFICER → DIRECTOR, CHIEF FINANCIAL OFFICER
Mar 26, 2020 filing
- No longer listedROSSBACH, PETER, VAN EGMOND · DIRECTOR · Less than 5% · control person · listed since Aug 2005
- Addedvon Preyss, Daniel, Gunter · DIRECTOR · Less than 5% · control person
Older changes (9 more filings)
Dec 23, 2019 filing
- ChangedRIDGE, CHARLES, DAVID · title DIRECTOR AND CHIEF COMPLIANCE OFFICER → DIRECTOR, CHIEF COMPLIANCE OFFICER AND CHIEF FINANCIAL OFFICER
Feb 16, 2018 filing
- AddedKEEFE, JOSEPH, FRANCIS · DIRECTOR · Less than 5% · control person
Feb 13, 2015 filing
- ChangedRIDGE, CHARLES, DAVID · title CHIEF COMPLIANCE OFFICER / DIRECTOR → DIRECTOR AND CHIEF COMPLIANCE OFFICER
Feb 11, 2015 filing
- No longer listedNORMAN, ANNIKA, C · CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Feb 2014
- ChangedRIDGE, CHARLES, DAVID · title DIRECTOR → CHIEF COMPLIANCE OFFICER / DIRECTOR
Dec 25, 2014 filing
- No longer listedBNP PARIBAS INVESTMENT PARTNERS SA · SHAREHOLDER · 25–50% · indirect via IMPAX ASSET MANAGEMENT GROUP PLC · control person · listed since Dec 2007
- No longer listedBNP PARIBAS SA · SHAREHOLDER · 50–75% · indirect via FORTIS BANK SA · control person · listed since May 2009
- No longer listedBNP PARIBAS SA · SHAREHOLDER · 50–75% · indirect via BNP PARIBAS INVESTMENT PARTNERS SA · control person · listed since Apr 2009
- No longer listedFORTIS BANK SA · SHAREHOLDER · 25–50% · indirect via BNP PARIBAS INVESTMENT PARTNERS SA · control person · listed since Apr 2010
- No longer listedSTATE OF BELGIUM · SHAREHOLDER · 25–50% · indirect via FORTIS BANK SA · control person · listed since Oct 2008
Apr 9, 2014 filing
- AddedNORMAN, ANNIKA, C · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ChangedRIDGE, CHARLES, DAVID · title DIRECTOR AND CHIEF COMPLIANCE OFFICER → DIRECTOR
Dec 19, 2013 filing
- No longer listedKNIGHT, MICHAEL, BURT · CHIEF COMPLIANCE OFFICER · Less than 5% · control person · listed since Jul 2008
- ChangedRIDGE, CHARLES, DAVID · title DIRECTOR → DIRECTOR AND CHIEF COMPLIANCE OFFICER
Apr 23, 2012 filing
- No longer listedTAUNT, NIGEL, DAVID WYNNE · DIRECTOR · Less than 5% · control person · listed since Jan 2008
- AddedBNP PARIBAS INVESTMENT PARTNERS SA · SHAREHOLDER · 25–50% · indirect via IMPAX ASSET MANAGEMENT GROUP PLC · control person
- AddedBNP PARIBAS SA · SHAREHOLDER · 50–75% · indirect via FORTIS BANK SA · control person
- AddedBNP PARIBAS SA · SHAREHOLDER · 50–75% · indirect via BNP PARIBAS INVESTMENT PARTNERS SA · control person
- AddedFORTIS BANK SA · SHAREHOLDER · 25–50% · indirect via BNP PARIBAS INVESTMENT PARTNERS SA · control person
- AddedSTATE OF BELGIUM · SHAREHOLDER · 25–50% · indirect via FORTIS BANK SA · control person
Dec 22, 2011 filing (earliest on record)
- ListedFALCONER, KEITH · DIRECTOR · Less than 5% · control person
- ListedIMPAX ASSET MANAGEMENT GROUP PLC · PARENT · 75% or more · control person
- ListedJENKYN-JONES, BRUCE · DIRECTOR · Less than 5% · control person
- ListedKNIGHT, MICHAEL, BURT · CHIEF COMPLIANCE OFFICER · Less than 5% · control person
- ListedRIDGE, CHARLES, DAVID · DIRECTOR · Less than 5% · control person
- ListedROSSBACH, PETER, VAN EGMOND · DIRECTOR · Less than 5% · control person
- ListedSIMM, IAN, RICHARD · DIRECTOR · Less than 5% · control person
- ListedTAUNT, NIGEL, DAVID WYNNE · DIRECTOR · Less than 5% · 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)
- KLA Corp$213.4M +39.8%
- Amphenol Corp$167.2M +384.2%
- Veralto Corp$161.4M +54.1%
- Cintas Corp$156.1M +61.4%
- Deere & Co$135.5M +1298.4%
Top Trims
- eBay Inc-$192.2M -77.8%
- Zoetis Inc-$139.1M -89.8%
- Linde PLC-$112.1M -13.2%
- A O Smith Corp-$105.6M -37.4%
- Hubbell Inc-$80.3M -24.0%
New Positions
- Badger Meter Inc$140.3M
- Teva Pharmaceutical Industries$18.1M
- Zebra Technologies Corp$15.1M
- Equinix Inc$13.9M
- Meritage Homes Corp$9.0M
Exited Positions
- Impax Global Infrastructure ET$70.7M
- Chemed Corp$66.6M
- Sealed Air Corp$6.1M
- Revvity Inc$5.5M
- Biogen Inc$5.3M
Impax Asset Management Group plc 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 | KLA Corp | KLAC | 482480100 | $749.0M | 4.87% | 2,482,564 | SH |
| 2 | NVIDIA Corp | NVDA | 67066G104 | $744.9M | 4.85% | 3,722,756 | SH |
| 3 | Linde PLC | LIN | G54950103 | $736.6M | 4.79% | 1,419,343 | SH |
| 4 | Xylem Inc/NY | XYL | 98419M100 | $528.3M | 3.44% | 4,468,984 | SH |
| 5 | Microsoft Corp | MSFT | 594918104 | $503.8M | 3.28% | 1,350,648 | SH |
| 6 | American Water Works Co Inc | AWK | 030420103 | $471.5M | 3.07% | 3,583,592 | SH |
| 7 | Veralto Corp | VLTO | 92338C103 | $459.9M | 2.99% | 5,186,589 | SH |
| 8 | Cintas Corp | CTAS | 172908105 | $410.5M | 2.67% | 2,413,313 | SH |
| 9 | Waste Connections Inc | WCN | 94106B101 | $329.9M | 2.15% | 1,979,027 | SH |
| 10 | Cia de Saneamento Basico do Es | SBS | 20441A102 | $302.4M | 1.97% | 52,324,409 | SH |
| 11 | Advanced Drainage Systems Inc | WMS | 00790R104 | $289.7M | 1.89% | 1,845,942 | SH |
| 12 | Ecolab Inc | ECL | 278865100 | $275.4M | 1.79% | 988,389 | SH |
| 13 | Hubbell Inc | HUBB | 443510607 | $254.7M | 1.66% | 486,855 | SH |
| 14 | Aptiv PLC | APTV | G3265R107 | $250.9M | 1.63% | 4,087,314 | SH |
| 15 | Vertiv Holdings Co | VRT | 92537N108 | $244.3M | 1.59% | 729,503 | SH |
| 16 | Agilent Technologies Inc | A | 00846U101 | $222.5M | 1.45% | 1,674,957 | SH |
| 17 | IDEX Corp | IEX | 45167R104 | $218.3M | 1.42% | 962,000 | SH |
| 18 | Watts Water Technologies Inc | WTS | 942749102 | $212.7M | 1.38% | 543,412 | SH |
| 19 | Amphenol Corp | APH | 032095101 | $210.8M | 1.37% | 1,195,285 | SH |
| 20 | Core & Main Inc | CNM | 21874C102 | $202.8M | 1.32% | 4,203,618 | SH |
| 21 | Marvell Technology Inc | MRVL | 573874104 | $196.7M | 1.28% | 660,285 | SH |
| 22 | RenaissanceRe Holdings Ltd | RNR | G7496G103 | $195.0M | 1.27% | 615,422 | SH |
| 23 | A O Smith Corp | AOS | 831865209 | $176.5M | 1.15% | 2,813,713 | SH |
| 24 | Applied Materials Inc | AMAT | 038222105 | $175.6M | 1.14% | 242,832 | SH |
| 25 | Itron Inc | ITRI | 465741106 | $166.7M | 1.08% | 1,926,905 | SH |
| 26 | Masco Corp | MAS | 574599106 | $165.3M | 1.08% | 2,031,735 | SH |
| 27 | Mastercard Inc | MA | 57636Q104 | $163.2M | 1.06% | 317,661 | SH |
| 28 | Cadence Design Systems Inc | CDNS | 127387108 | $160.1M | 1.04% | 426,623 | SH |
| 29 | Pentair PLC | PNR | G7S00T104 | $160.0M | 1.04% | 2,087,003 | SH |
| 30 | TE Connectivity PLC | TEL | G87052109 | $153.8M | 1.00% | 762,712 | SH |
| 31 | Westinghouse Air Brake Technol | WAB | 929740108 | $150.6M | 0.98% | 558,757 | SH |
| 32 | AECOM | ACM | 00766T100 | $148.6M | 0.97% | 2,128,339 | SH |
| 33 | Synopsys Inc | SNPS | 871607107 | $148.5M | 0.97% | 332,929 | SH |
| 34 | Deere & Co | DE | 244199105 | $146.0M | 0.95% | 230,130 | SH |
| 35 | Badger Meter Inc | BMI | 056525108 | $140.3M | 0.91% | 945,694 | SH |
| 36 | Zurn Elkay Water Solutions Cor | ZWS | 98983L108 | $133.1M | 0.87% | 2,633,758 | SH |
| 37 | Valmont Industries Inc | VMI | 920253101 | $130.6M | 0.85% | 226,080 | SH |
| 38 | Franklin Electric Co Inc | FELE | 353514102 | $126.0M | 0.82% | 1,175,582 | SH |
| 39 | Union Pacific Corp | UNP | 907818108 | $123.9M | 0.81% | 455,346 | SH |
| 40 | Pinnacle Financial Partners In | PNFP | 72348N109 | $115.2M | 0.75% | 1,142,360 | SH |
| 41 | Tetra Tech Inc | TTEK | 88162G103 | $113.6M | 0.74% | 3,931,741 | SH |
| 42 | Apple Inc | AAPL | 037833100 | $105.0M | 0.68% | 363,014 | SH |
| 43 | NextEra Energy Inc | NEE | 65339F101 | $103.2M | 0.67% | 1,175,682 | SH |
| 44 | QXO Inc | QXO | 82846H405 | $101.3M | 0.66% | 5,861,003 | SH |
| 45 | Trane Technologies PLC | TT | G8994E103 | $99.2M | 0.65% | 202,048 | SH |
| 46 | Autodesk Inc | ADSK | 052769106 | $97.3M | 0.63% | 500,719 | SH |
| 47 | SiteOne Landscape Supply Inc | SITE | 82982L103 | $95.7M | 0.62% | 836,410 | SH |
| 48 | Littelfuse Inc | LFUS | 537008104 | $89.8M | 0.58% | 197,265 | SH |
| 49 | Monolithic Power Systems Inc | MPWR | 609839105 | $87.7M | 0.57% | 63,427 | SH |
| 50 | Citizens Financial Group Inc | CFG | 174610105 | $77.5M | 0.50% | 1,105,960 | SH |
Filing History
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-11 | $15.37B | 284 | 0001749768-26-000004 |
| 2026-03-31 | 2026-05-12 | $14.35B | 287 | 0001749768-26-000002 |
| 2025-12-31 | 2026-01-29 | $15.98B | 279 | 0001749768-26-000001 |
| 2025-09-30 | 2025-11-06 | $17.14B | 275 | 0001749768-25-000052 |
| 2023-12-31 | 2024-01-26 | $24.91B | 366 | 0001749768-24-000007 |
| 2023-09-30 | 2023-11-07 | $22.38B | 395 | 0001749768-23-000017 |
Filer Information
Address
7TH FLOOR30 PANTON STREET
LONDON, X0 SW1Y 4AJ
Phone
00442039123000
Filing Manager
Impax Asset Management Group plc
LONDON, X0
Signatory
Asford Muiruri
Investment Control Associate