# Siena Capital

Siena Capital is a Private Equity based in Evanston, Estonia.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** Evanston, Estonia
- **Region:** Europe
- **Address:** Toom-Rüütli tn 10/1-1, 10130 Tallinn, Estonia
- **Assets under management:** Undisclosed
- **Website:** www.siena.ee

## About

Siena Capital is an SEC-registered investment adviser in Evanston, IL, registered since 2015. The firm manages approximately $379 million in regulatory assets. It has 5 employees and 5 investment advisers.

## Sectors

- Enterprise Software
- Mobility & Transportation
- FinTech
- Digital Health
- PropTech
- Robotics & Automation
- Energy Transition & Renewables
- Media & Entertainment

## People

- Rain Tamm — General Partner
- Rando Rannus — General Partner
- Lauri Isotamm — General Partner

## Questions

### Who runs investment decisions at Siena Capital?

The General Partners — Rain Tamm, Rando Rannus, and Lauri Isotamm — share investment responsibilities. The three have worked together for over 25 years across corporate finance, tech-enabled investments, and startup exits. The firm does not publicly designate a single Chief Investment Officer.

### How does Siena Capital source secondary deal flow?

Siena sources transactions directly from founders and early employees of late-stage European startups. The firm relies on its team's personal networks built over decades in the regional tech ecosystem and its public positioning as the first Baltic-dedicated VC secondary fund to generate inbound liquidity requests.

### What investment stages and geographies does Siena Capital target?

Siena targets growth-stage and pre-IPO technology companies primarily across Northern and Eastern Europe. Confirmed portfolio companies include Bolt, Veriff, Starship Technologies, and Oura — all businesses that raised significant primary venture funding before Siena purchased secondary shares.

### Does Siena Capital participate in primary venture rounds or fund commitments?

Siena's stated strategy is focused on direct secondary transactions — purchasing existing shares from individual stakeholders in venture-backed companies. The firm does not list primary venture round investments or commitments to third-party venture capital funds as part of its disclosed activities.

## Related profiles

- [Siemens Energy Ventures](https://altss.com/profile/siemens-energy-ventures)
- [Sier Capital Partners](https://altss.com/profile/sier-capital-partners)

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Last updated: 2026-06-03T20:00:00.000Z

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