Adhesion Wealth Partnered with Fidelity Investments

The firm introduced custom model portfolios to help registered investment advisors streamline their operations.

Updated on Sept. 28, 2026 in Investing

Isometric editorial illustration of stacked geometric volumes representing financial account sleeves in muted tones of teal, mustard, and slate blue. — Adhesion Wealth has launched a new custom model portfolio offering in partnership with Fidelity Investments to streamline advisor operations. AI Illustration. Upload story photo >

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Adhesion Wealth has launched a new custom model portfolio offering in partnership with Fidelity Investments. The initiative integrates Fidelity's research and construction capabilities with Adhesion's tax-management and rebalancing technology.

Why it matters

Registered investment advisors are increasingly looking to provide personalized investment experiences without the burden of maintaining extensive internal infrastructure and staffing for custom management.

Fidelity Investments added 14 models to the Adhesion Essentials platform. Total third-party model portfolio assets reached $943 billion as of March 31, 2026, with custom models accounting for $258 billion.

The players

Adhesion Wealth

A Charlotte-based financial technology provider that specializes in trading, rebalancing, and tax-management services for investment advisors.

Fidelity Investments

A multinational financial services corporation that provides investment research, portfolio construction, and brokerage services.

AssetMark

A wealth management platform provider that acquired Adhesion Wealth in 2022.

The details

The offering utilizes unified managed account technology to hold various investment strategies in separate account sleeves, enabling multi-sleeve portfolios. Adhesion Wealth has opted to waive both its platform fee and its Tax Management Services fee for users of this new service.

AssetMark acquired Adhesion Wealth in 2022.
Total third-party model portfolio assets reached $943 billion by March 31, 2026.
Adhesion Wealth launched Tax Management Services in July 2026.
Adhesion Wealth plans to launch a Manager Research Center in late 2026.

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Market Dynamics

This partnership follows the established industry shift toward the adoption of third-party model portfolios to achieve scale. It positions Adhesion Wealth to capture more of the rapidly growing managed account market against competitors focusing on proprietary solutions.

Registered investment advisors using this platform can now implement multi-sleeve portfolios without paying platform or tax management fees. This reduces the overhead costs for firms aiming to offer personalized investment strategies to their individual clients.

The takeaway

The move underscores a broader shift where technology providers are prioritizing tax optimization and outsourcing to differentiate their offerings. Financial advisors can utilize these integrated tools to deliver complex portfolio management without needing to build the infrastructure in-house.