Build Capital was established on a simple conviction: durable wealth benefits from deliberate structure, disciplined oversight, and long-term alignment. As financial complexity grows, the need for independent guidance becomes increasingly important.
Steven Castro
Founder & Independent Fiduciary Advisor
More than two decades of experience.
I've spent more than two decades in wealth management, including years at Merrill Lynch and UBS — inside the largest firms in the industry. That experience taught me a great deal about markets, portfolios, and planning. It also taught me something about how advice gets shaped by the environment it's delivered in.
I founded Build Capital because I believe advice works best when it's structured around one thing: the client's interest. No proprietary products. No sales quotas. No pressure to fit your life into a model. Just independent, fiduciary guidance — with your assets held in your name at Altruist, an independent custodian, never with me.
I work with a deliberately small number of professionals, business owners, and families in Phoenix and beyond. Small on purpose: every client gets my direct attention, not a team member's, and every portfolio gets reviewed by the person whose name is on the door.
If you've spent decades building your wealth, you deserve to know — with confidence — that your strategy still fits the life you're living today. That's the conversation I'd welcome having with you.
Build Capital operates as a fiduciary advisory firm. Advice is provided in the client's best interest, without proprietary products, sales quotas, or competing incentives.
Build Capital intentionally maintains a focused advisory practice so each relationship receives meaningful attention and ongoing oversight.
This includes coordination with tax professionals, estate attorneys, and other advisors when appropriate.
Investment decisions rarely exist in isolation. Durable outcomes often depend on how well the broader financial structure works together.
Aligned with one interest. Yours.
Request a Private Introductory ConversationPhoenix, Arizona · Virtual meetings available