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John Duffield
Director/Board Member at
NEW STAR INVESTMENT TRUST PLC
Net worth: 77 M $ as of 30/05/2026
Profile
John Lincoln Duffield was the founder of Henderson Asset Management Ltd., founded in 2000, where he held the title of Chairman in 2009.
Mr. Duffield was the founder of Jupiter Investment Management Group Ltd., founded in 1985, where he held the title of Chief Executive Officer in 2000.
Mr. Duffield was the founder of Brompton AM LLP (Investment Management), founded in 2009, where he held the title of Senior Partner from 2009 to 2021.
Mr. Duffield is also the founder of Jupiter Fund Management Plc,New Star Asset Management Ltd...
Mr. Duffield currently holds the position of Deputy Chairman at New Star Investment Trust Plc since 2000.
Mr. Duffield is a Director at Brompton Asset Management Holdings Ltd. since 2009.
Mr. Duffield is a Director at Marcham Farms Ltd. since 1996.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 29/09/2025 | 42,543,193 ( 59.9% ) | 77 M $ | 30/05/2026 |
John Duffield active positions
| Companies | Position | Start |
|---|---|---|
| NEW STAR INVESTMENT TRUST PLC | Director/Board Member | 04/04/2000 |
Brompton Asset Management Holdings Ltd.
 Brompton Asset Management Holdings Ltd. Investment ManagersFinance Provides fund management services | Director/Board Member | 06/04/2009 |
Marcham Farms Ltd.
 Marcham Farms Ltd. Agricultural Commodities/MillingProcess Industries Engages in growing of cereals, leguminous crops and oil seeds | Director/Board Member | 06/08/1996 |
Former positions of John Duffield
| Companies | Position | End |
|---|---|---|
Brompton Asset Management LLP
 Brompton Asset Management LLP Investment ManagersFinance Brompton aims to provide investors with outstanding risk-adjusted returns over the long-term through investing in a broad range of asset classes from equities, bonds and commercial property as well as alternative investments such as commodities and hedge funds. The firm’s real estate investment team takes a core plus approach to investing clients’ capital in investment strategies aimed at producing attractive risk-adjusted returns in international markets. The team builds relatively-conservative real estate portfolios offering stable and growing income returns and opportunities for value creation. | Chief Executive Officer | 30/11/2021 |
New Star Asset Management Ltd.
 New Star Asset Management Ltd. Investment Trusts/Mutual FundsMiscellaneous Manages funds | Founder | 31/03/2009 |
Henderson Asset Management Ltd.
 Henderson Asset Management Ltd. Real Estate DevelopmentFinance Provides property management services | Founder | 31/03/2009 |
Jupiter Investment Management Group Ltd.
 Jupiter Investment Management Group Ltd. Investment ManagersFinance Provides investment management services | Chief Executive Officer | 31/12/1999 |
| JUPITER FUND MANAGEMENT PLC | Founder | - |
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
23
1st degree connections
8
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 8 |
|---|---|
New Star Investment Trust Plc
 New Star Investment Trust Plc Investment Trusts/Mutual FundsMiscellaneous Functions as a closed-end investment fund or Investment trust | Miscellaneous |
Jupiter Fund Management Plc
 Jupiter Fund Management Plc Investment Trusts/Mutual FundsMiscellaneous Provides investment management services | Miscellaneous |
Henderson Asset Management Ltd.
Henderson Asset Management Ltd. Real Estate DevelopmentFinance Provides property management services | Finance |
New Star Asset Management Ltd.
New Star Asset Management Ltd. Investment Trusts/Mutual FundsMiscellaneous Manages funds | Miscellaneous |
Jupiter Investment Management Group Ltd.
Jupiter Investment Management Group Ltd. Investment ManagersFinance Provides investment management services | Finance |
Brompton Asset Management LLP
Brompton Asset Management LLP Investment ManagersFinance Brompton aims to provide investors with outstanding risk-adjusted returns over the long-term through investing in a broad range of asset classes from equities, bonds and commercial property as well as alternative investments such as commodities and hedge funds. The firm’s real estate investment team takes a core plus approach to investing clients’ capital in investment strategies aimed at producing attractive risk-adjusted returns in international markets. The team builds relatively-conservative real estate portfolios offering stable and growing income returns and opportunities for value creation. | Finance |
Brompton Asset Management Holdings Ltd.
Brompton Asset Management Holdings Ltd. Investment ManagersFinance Provides fund management services | Finance |
Marcham Farms Ltd.
Marcham Farms Ltd. Agricultural Commodities/MillingProcess Industries Engages in growing of cereals, leguminous crops and oil seeds | Process Industries |
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