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John Duffield
Director/Board Member at
NEW STAR INVESTMENT TRUST PLC
Net worth: 79 M $ as of 30/09/2026
Profile
Mr. John L.
Duffield is a Chairman at Brompton Asset Management Holdings Ltd. He is on the Board of Directors at New Star Investment Trust Plc and Marcham Farms Ltd. Mr. Duffield was previously employed as a Senior Partner by BROMPTON ASSET MANAGEMENT LLP (INVESTMENT MANAGEMENT), a Chairman by New Star Asset Management Group Ltd. /GB/, a Chief Executive Officer by Jupiter International Group Plc, a Founder by Jupiter Fund Management Plc, and an Executive Chairman by New Star Asset Management Ltd.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 30/09/2025 | 4,25,43,193 ( 59.9% ) | 79 M $ | 30/09/2026 |
John Duffield active positions
| Companies | Position | Start |
|---|---|---|
| NEW STAR INVESTMENT TRUST PLC | Director/Board Member | 05/04/2000 |
Brompton Asset Management Holdings Ltd.
 Brompton Asset Management Holdings Ltd. Investment ManagersFinance Provides fund management services | Chairman | - |
Marcham Farms Ltd.
 Marcham Farms Ltd. Agricultural Commodities/MillingProcess Industries Engages in growing of cereals, leguminous crops and oil seeds | Director/Board Member | 07/08/1996 |
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 | 01/12/2021 |
New Star Asset Management Ltd.
 New Star Asset Management Ltd. Investment Trusts/Mutual FundsMiscellaneous Manages funds | Founder | 01/04/2009 |
Henderson Asset Management Ltd.
 Henderson Asset Management Ltd. Real Estate DevelopmentFinance Provides property management services | Founder | 01/04/2009 |
Jupiter Investment Management Group Ltd.
 Jupiter Investment Management Group Ltd. Investment ManagersFinance Provides investment management services | Chief Executive Officer | 01/01/2000 |
| JUPITER FUND MANAGEMENT PLC | Founder | - |
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
29
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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