Launching Alt Goes Mainstream to educate the market

In this episode of The Rainmaker Podcast, Gui Costin sits down with Michael Sidgmore, Partner and Co-Founder of Broadhaven Ventures and Founder of Alt Goes Mainstream, to unpack one of the most important structural shifts in asset management today: the convergence of private markets and private wealth.

Michael begins by walking through his path from growing up outside Washington, D.C., to studying at the London School of Economics, where he first gained exposure to private markets by leading one of the world’s largest student-run hedge fund and private equity conferences. That early immersion led to roles at Goldman Sachs’ Principal Strategic Investments group, early-stage operating experience at Mosaic, and ultimately a formative stretch at iCapital, where he helped build distribution efforts pre-product, with a blank slate approach to the wealth channel.

That experience shaped his long-term thesis: private markets are becoming mainstream, and the infrastructure supporting them must evolve accordingly.

At Broadhaven Ventures, Michael invests across fintech, asset management, and market infrastructure businesses that sit between general partners (GPs) and limited partners (LPs). His focus centers on the “plumbing” of private markets, from pre-investment distribution to post-investment reporting and analytics, particularly as more capital flows in from the wealth channel.

The conversation then turns to Alt Goes Mainstream (AGM), Michael’s media platform designed to educate both private markets professionals and wealth managers about their growing intersection. His “north star” is clear: education drives allocation. As large asset managers increasingly prioritize private wealth distribution, they must rethink branding, marketing, and direct engagement. Meanwhile, wealth managers must better understand how private markets firms operate, structure products, and build long-term partnerships.

Gui and Michael explore the evolving role of brand in asset management. Distribution, they note, is expensive and operationally complex, but firms that invest in both boots-on-the-ground sales and aerial marketing support can “own the narrative.” In an environment where attention is fragmented and algorithms are controlled by third parties, direct communication, whether through podcasts, newsletters, or owned media studios, has become a strategic advantage.

Ultimately, the episode highlights a defining industry shift: distribution is no longer optional for firms seeking scale. As private markets expand into wealth, success will favor those who combine infrastructure, education, and authentic brand-building to meet in the middle.

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