M33 Growth

The firm was founded in 2017 by Michael Anello, Brian Shortsleeve, and Gabriel Ling. Anello and Shortsleeve previously held senior roles focused on growth-stage operational investing. The team brought together a hybrid of private equity execution and hands-on operating expertise, positioning M33 as a commercial-scale partner rather than a passive growth-capital provider.

M33 Growth almost exclusively targets revenue-stage companies generating $10 million to $75 million in annual recurring revenue. The firm does not run a seed or Series A practice. Its model is designed to acquire majority positions in bootstrapped or lightly capitalized businesses that have established product-market fit and need go-to-market execution.

The firm uses a proprietary outbound sourcing model concentrated on founder-owned software and digital health companies. M33 specifically targets businesses outside the coastal venture hubs — particularly in the Midwest and Southeast — that have grown without institutional capital. The partnership pool runs shared origination, and the firm often engages founders through direct conversations about liquidity and scaling, rather than through competitive auction processes.

M33 Growth is structured as a private equity firm that operates with a growth-buyout mandate. It acquires majority control in cash-flowing software companies, a posture closer to traditional growth equity with operating influence than to venture capital. The firm embeds sales and revenue operations resources into its portfolio to drive post-close execution.

M33 Growth targets growth-stage and growth-buyout opportunities. The firm writes checks ranging from roughly $30 million to over $100 million per platform, focusing on companies with product-market fit and recurring revenue between $10 million and $75 million. It does not participate in early-stage or pre-revenue venture rounds.

As of the latest available public record, M33 Growth has not announced any separate philanthropic foundations, early-stage venture arm, or real-asset vehicle. The firm operates through its primary growth-equity and buyout fund structures, all managed out of its Boston headquarters.

M33 Growth typically pursues controlling or significant minority positions and structures its own deals rather than co-investing passively alongside other growth-equity firms. The firm's model favors direct negotiation with founders over participating in syndicated rounds. When external capital is added, M33 usually anchors the transaction and selects co-investors selectively on a deal-by-deal basis.