![Stephen Kelley](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>)
Stephen Kelley
Chief Executive Officer at
ADVANCED ENERGY INDUSTRIES, INC.
Net worth: 32 M $ as of 2026-06-29
Profile
Stephen Douglas Kelley is currently President, Chief Executive Officer & Director at Advanced Energy Industries, Inc. since 2021.
He is Managing Director at Capital Southwest Management Co. and Independent Director at Onto Innovation, Inc. since 2023.
Formerly, he was President, Chief Executive Officer & Director at Amkor Technology, Inc. from 2013 to 2020, Chief Executive Officer at Scio Diamond Technology Corp.
from 2012 to 2013, Director at Global Semiconductor Alliance, Director at Switch Bulb Co., Inc., Vice President and General Manager-Standard Linear & Logic Group at Texas Instruments Incorporated from 2003 to 2008, Chief Operating Officer & Executive Vice President at Wolfspeed, Inc. from 2008 to 2011, and Senior Vice President & General Manager at Philips Semiconductors, Inc. from 1993 to 2003.
Education includes undergraduate studies at Massachusetts Institute of Technology and graduate studies at Santa Clara University.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-03-09 | 80,376 ( 0.21% ) | 30 M $ | 2026-06-29 | |
| 2026-05-19 | 6,384 ( 0.01% ) | 2 M $ | 2026-06-29 |
Stephen Kelley active positions
| Companies | Position | Start |
|---|---|---|
| ADVANCED ENERGY INDUSTRIES, INC. | Chief Executive Officer | 2021-02-28 |
| ONTO INNOVATION INC. | Director/Board Member | 2023-01-23 |
Capital Southwest Management Co.
 Capital Southwest Management Co. Investment ManagersFinance Capital Southwest Management invest in middle-market companies located in the United States with an EBITDA of USD 3 - 20 million. The firm focuses on companies operating across a broad range of sectors and industries. It provides equity and debt financing for acquisitions, dividend recapitalizations, refinancing, bolt-on acquisitions and growth transactions. It makes co-investments. | Private Equity Investor | - |
Former positions of Stephen Kelley
| Companies | Position | End |
|---|---|---|
| AMKOR TECHNOLOGY, INC. | Chief Executive Officer | 2020-06-16 |
| SCIO DIAMOND TECHNOLOGY CORPORATION | President | 2013-01-31 |
| WOLFSPEED, INC. | Chief Operating Officer | 2011-10-17 |
| TEXAS INSTRUMENTS INCORPORATED | Corporate Officer/Principal | 2007-12-31 |
Philips Semiconductors, Inc.
 Philips Semiconductors, Inc. SemiconductorsElectronic Technology Manufactures semiconductors | Corporate Officer/Principal | 2002-12-31 |
Training of Stephen Kelley
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
63
1st degree connections
12
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 12 |
|---|---|
Texas Instruments Incorporated
 Texas Instruments Incorporated SemiconductorsElectronic Technology Manufactures and sells analog semiconductors & embedded processing products | Electronic Technology |
Wolfspeed, Inc.
 Wolfspeed, Inc. SemiconductorsElectronic Technology Develops and manufactures semiconductors & related devices | Electronic Technology |
Advanced Energy Industries, Inc.
 Advanced Energy Industries, Inc. Electronic Production EquipmentElectronic Technology Develops and supplies power conversion and control systems | Electronic Technology |
Amkor Technology, Inc.
 Amkor Technology, Inc. SemiconductorsElectronic Technology Provides outsourced semiconductor packaging and test services | Electronic Technology |
Scio Diamond Technology Corp.
 Scio Diamond Technology Corp. Other Consumer SpecialtiesConsumer Durables Operates as a diamond technology company | Consumer Durables |
Massachusetts Institute of Technology
 Massachusetts Institute of Technology Finance/Rental/LeasingFinance Functions as a College/University | Finance |
Santa Clara University
 Santa Clara University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Philips Semiconductors, Inc.
Philips Semiconductors, Inc. SemiconductorsElectronic Technology Manufactures semiconductors | Electronic Technology |
Global Semiconductor Alliance
 Global Semiconductor Alliance Miscellaneous Commercial ServicesCommercial Services Provides information on and organizes events for the semiconductor industry in order to ensure growth and profitability of the industry | Commercial Services |
Switch Bulb Co., Inc.
 Switch Bulb Co., Inc. Electrical ProductsProducer Manufacturing Designs LED lighting solutions | Producer Manufacturing |
Capital Southwest Management Co.
Capital Southwest Management Co. Investment ManagersFinance Capital Southwest Management invest in middle-market companies located in the United States with an EBITDA of USD 3 - 20 million. The firm focuses on companies operating across a broad range of sectors and industries. It provides equity and debt financing for acquisitions, dividend recapitalizations, refinancing, bolt-on acquisitions and growth transactions. It makes co-investments. | Finance |
Onto Innovation, Inc.
 Onto Innovation, Inc. Electronic Equipment/InstrumentsElectronic Technology Develops process control systems | Electronic Technology |
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