Principal / Operator / Builder

Patient capital,
operated & earned.

Dennis A. Close is the operating principal of Dice Holdings — a private platform with $2B+ in cumulative asset value across real assets, regulated digital markets, and the IRONCLAD compute network. Thirty years of building, scaling, and exiting under institutional scrutiny.

Based Jupiter, Florida

Platform Dice Holdings LLC

Style Family office · Long-hold

Portrait of Dennis A. Close — D.A. CLOSE2026

01 Mandate

Built, scaled, exited — under institutional scrutiny.

One operator. One book. Concentrated positions across three verticals — with third-party institutional validation: a strategic fintech exit and eight marinas designed, built, and delivered — in whole or in part — several subsequently acquired by institutional owners including Blackstone (Safe Harbor) and IGY. No fund cycle. No syndicate. Decisions made with the calendar of a generation.

$2B+Private capital managed

$150MStrategic exit

$500M+Total maritime transactions

8Marinas designed & built

30yrPrincipal operations

02Verticals

Three operating books. One discipline.

Vertical / 01

Platform & Capital Markets

Liquidity One AG · Strategic exit

SEC/FINRA-registered ATS for tokenization, real-time settlement, and collateral optimization. Acquired by DeRisk Digital / Bosonic.

IRONCLAD

Dedicated GPU infrastructure

Single-tenant NVIDIA GPU clusters, owned and operated for enterprise AI. Predictable capacity without the complexity of running a data center.

View platform → Vertical / 03

Marinas & Yachts

8 marinas exited to Blackstone · IGY

Sovereign-grade marina, refit, and waterfront development. Island Gardens Miami, Old Port Cove, Admirals Cove, Harbourside Place — among others.

View portfolio →

03 Background

From the control room to the cap table.

Dennis began his career underway. Eight strategic deterrent patrols aboard SSBN submarines — USS Maryland, USS Kentucky, USS West Virginia — in the U.S. Navy's submarine fleet. Former Top Secret / SCI clearance and Intelligence Custodian.

That standard — zero-fail execution, complete checklists, quiet watches — carried directly into operating private capital. The marinas, the platform, the validator network: all built to the same tolerances.

Full background →

04 Direct line

Inquiries from operators, owners of waterfront assets, and aligned long-hold capital.

Open contact →

Patient capital, operated & earned.