![Arief Widyaman Sidarto](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Net worth: 20 M $ as of 2026-07-30
Arief Widyaman Sidarto currently works at PT Amman Mineral Nusa Tenggara, as Director from 2017, PT Amman Mineral Internasional Tbk, as President Director, SM Investments Pte Ltd., as Director, Slate Alt Pte Ltd., as Director, and Macmahon Holdings Ltd., as Non-Independent Non-Executive Director from 2026.
Mr. Sidarto also formerly worked at Macmahon Holdings Ltd., as Non-Independent Non-Executive Director from 2017 to 2023, PT Rajawali Corp., as Managing Director & Director, and Wellspring Capital Partners Pte Ltd., as Managing Director from 2010 to 2014.
Mr. Sidarto received his undergraduate degree from The Wharton School of the University of Pennsylvania and Masters Business Admin degree from Harvard Business School.
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2025-12-30 | 79,056,600 ( 0.11% ) | 18 M $ | 2026-07-30 | |
| 2026-07-12 | 2,619,447 ( 0.12% ) | 2 M $ | 2026-07-30 |
| Companies | Position | Start |
|---|---|---|
| PT AMMAN MINERAL INTERNASIONAL TBK | Chief Executive Officer | - |
| MACMAHON HOLDINGS LIMITED | Director/Board Member | 2026-04-28 |
PT Amman Mineral Nusa Tenggara
 PT Amman Mineral Nusa Tenggara Other Metals/MineralsNon-Energy Minerals Mines for copper and gold ores | Corporate Officer/Principal | 2017-03-31 |
SM Investments Pte Ltd.
 SM Investments Pte Ltd. Investment ManagersFinance A join venture led by Salim Group and PT Medco Energi Internasional Tbk | Director/Board Member | - |
Slate Alt Pte Ltd. | Director/Board Member | - |
| Companies | Position | End |
|---|---|---|
| MACMAHON HOLDINGS LIMITED | Director/Board Member | 2023-07-12 |
Wellspring Capital Partners Pte Ltd. | Chief Executive Officer | 2013-12-31 |
PT Rajawali Corp.
 PT Rajawali Corp. Specialty TelecommunicationsCommunications Operates as an investment holding company with interests in telecommunications, property, hotel management, and mining industries | Chief Executive Officer | - |
Active
Inactive
Listed companies
Private companies
1st degree connections
1st degree companies
Male
Female
Members of the board
Executives
| Private companies | 9 |
|---|---|
Macmahon Holdings Ltd.
 Macmahon Holdings Ltd. CoalEnergy Minerals Provides mining, civil construction and engineering services | Energy Minerals |
PT Rajawali Corp.
PT Rajawali Corp. Specialty TelecommunicationsCommunications Operates as an investment holding company with interests in telecommunications, property, hotel management, and mining industries | Communications |
PT Amman Mineral Nusa Tenggara
PT Amman Mineral Nusa Tenggara Other Metals/MineralsNon-Energy Minerals Mines for copper and gold ores | Non-Energy Minerals |
The Wharton School of the University of Pennsylvania
 The Wharton School of the University of Pennsylvania Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Harvard Business School
 Harvard Business School Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
PT Amman Mineral Internasional Tbk
 PT Amman Mineral Internasional Tbk Precious MetalsNon-Energy Minerals Provides gold and copper mining services | Non-Energy Minerals |
Wellspring Capital Partners Pte Ltd. | |
SM Investments Pte Ltd.
SM Investments Pte Ltd. Investment ManagersFinance A join venture led by Salim Group and PT Medco Energi Internasional Tbk | Finance |
Slate Alt Pte Ltd. |
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