![Kai Öistämö](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>)
Kai Öistämö
Chief Executive Officer at
VAISALA OYJ
Net worth: 2 M $ as of 2026-05-30
Profile
Dr. Kai O.
Öistämö is an Independent Non-Executive Director at Nokia Oyj, a President & Chief Executive Officer at Vaisala Oyj, a Chairman at Helvar Oy Ab, a Chairman at Fastems Oy Ab and a Chairman at Helvar Ltd. He is on the Board of Directors at Nokia Oyj.
Dr. Öistämö was previously employed as an Executive Partner by SIRIS Capital Group LLC, an Independent Director by Qt Group Plc, a Chief Operating Officer by InterDigital, Inc., a Chairman by oikian solutions Oy, a Chairman by University of Tampere, an Independent Non-Executive Director by Sanoma Oyj, an Independent Director by Nokian Renkaat Oyj, a Chairman by Innovaatiorahoituskeskus Business Finland, and a Technology Director-Signal Processing by Tampere University of Technology.
He also served on the board at Mavenir Ltd., Digia Oyj, Adven Oy, Here Holding Corp., InterDigital Technology Corp.
and Mavenir Systems, Inc. (Texas).
He received his graduate degree from Tampere University of Technology and a doctorate degree from Tampere University of Technology.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
VAISALA OYJ CLASS A 0.07% | 2025-12-30 | 24,529 ( 0.07% ) | 2 M $ | 2026-05-30 |
Kai Öistämö active positions
| Companies | Position | Start |
|---|---|---|
| VAISALA OYJ | Chief Executive Officer | 2020-09-30 |
| NOKIA OYJ | Director/Board Member | 2022-04-04 |
Helvar Oy Ab
 Helvar Oy Ab Electrical ProductsProducer Manufacturing Wholesales & distributes electric lighting fixtures | Chairman | 2014-10-31 |
Helvar Ltd.
 Helvar Ltd. Electronic Production EquipmentElectronic Technology Manufactures and sells lighting solutions such as LED drivers, modules and accessories, ballasts, sensors and software | Chairman | - |
Fastems Oy Ab
 Fastems Oy Ab Industrial MachineryProducer Manufacturing Manufactures flexible manufacturing systems | Chairman | 2014-07-31 |
Former positions of Kai Öistämö
| Companies | Position | End |
|---|---|---|
| INTERDIGITAL, INC. | Chief Operating Officer | 2020-09-29 |
SIRIS Capital Group LLC
 SIRIS Capital Group LLC Investment ManagersFinance SIRIS Capital Group invests in middle market companies located in the United States primarily in North America with an EBITDA of USD 10 - 50 million. The firm focuses on companies operating in the fields of technology and technology-enabled services companies. It provides financing for buyout transactions with an investment size of USD 100 - 500 million. The firm acquires controlling interest. | Corporate Officer/Principal | 2018-09-30 |
Mavenir Ltd.
 Mavenir Ltd. Specialty TelecommunicationsCommunications Provides communication solutions | Director/Board Member | 2018-09-30 |
| QT GROUP OYJ | Director/Board Member | 2017-12-31 |
| ░░░░░░ ░░░░░░░░░ ░░ | ░░░░░░░░ | ░░░░░░░░░░ |
Training of Kai Öistämö
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
84
1st degree connections
20
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 20 |
|---|---|
InterDigital, Inc.
 InterDigital, Inc. Packaged SoftwareTechnology Services Designs, develops and provides advanced wireless technologies | Technology Services |
Nokia Oyj
 Nokia Oyj Telecommunications EquipmentElectronic Technology Provides network infrastructure, technology and software services | Electronic Technology |
Here Holding Corp.
 Here Holding Corp. Data Processing ServicesTechnology Services Provides digital maps and map content processing services | Technology Services |
Mavenir Systems, Inc. (Texas)
 Mavenir Systems, Inc. (Texas) Packaged SoftwareTechnology Services Develops end-to-end cloud-native network Software | Technology Services |
Sanoma Oyj
 Sanoma Oyj Publishing: NewspapersConsumer Services Publishes magazines, newspapers and educational books | Consumer Services |
Vaisala Oyj
 Vaisala Oyj Electronic Equipment/InstrumentsElectronic Technology Develops, manufactures and markets electronic measurement systems for environmental and industrial measurement | Electronic Technology |
Digia Oyj
 Digia Oyj Packaged SoftwareTechnology Services Operates as a software company that engages in the service and maintenance of information and communications technology systems | Technology Services |
Nokian Renkaat Oyj
 Nokian Renkaat Oyj Automotive AftermarketConsumer Durables Manufactures summer and winter tires for passenger cars | Consumer Durables |
University of Tampere
 University of Tampere Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
InterDigital Technology Corp. | |
Innovaatiorahoituskeskus Business Finland
 Innovaatiorahoituskeskus Business Finland Investment ManagersFinance Acts as an alternative investment manager | Finance |
Adven Oy
 Adven Oy Electric UtilitiesUtilities Provides district heating services | Utilities |
Fastems Oy Ab
Fastems Oy Ab Industrial MachineryProducer Manufacturing Manufactures flexible manufacturing systems | Producer Manufacturing |
Helvar Oy Ab
Helvar Oy Ab Electrical ProductsProducer Manufacturing Wholesales & distributes electric lighting fixtures | Producer Manufacturing |
Helvar Ltd.
Helvar Ltd. Electronic Production EquipmentElectronic Technology Manufactures and sells lighting solutions such as LED drivers, modules and accessories, ballasts, sensors and software | Electronic Technology |
Mavenir Ltd.
Mavenir Ltd. Specialty TelecommunicationsCommunications Provides communication solutions | Communications |
Tampere University of Technology
 Tampere University of Technology Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
SIRIS Capital Group LLC
SIRIS Capital Group LLC Investment ManagersFinance SIRIS Capital Group invests in middle market companies located in the United States primarily in North America with an EBITDA of USD 10 - 50 million. The firm focuses on companies operating in the fields of technology and technology-enabled services companies. It provides financing for buyout transactions with an investment size of USD 100 - 500 million. The firm acquires controlling interest. | Finance |
oikian solutions Oy
 oikian solutions Oy Information Technology ServicesTechnology Services Provides an indoor and outdoor location-based marketing platform for media companies and brand owners | Technology Services |
Qt Group Plc
 Qt Group Plc Packaged SoftwareTechnology Services Develops software tools | Technology Services |
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