Rational Investment Management, LLC

Updated today

Find your advisor

Client assets under management

$402,587,949

Clients

91% high-net worth

Advisors

of 2 employees

Firm type

Supported

1-3 advisors or $200M+ in AUM

Clients per advisor

Typical

Average account size

$4,328,903

About

Rational Investment Management provides discretionary investment supervisory services primarily to individual and high‑net‑worth clients, managing roughly $402.6 million with a small advisory team. The firm’s brochure also discloses that it serves a limited number of non‑retail entities — including banking/thrift institutions, insurance companies, state or municipal governments, other investment advisers, and a sovereign wealth fund — client types that are uncommon for firms of this size.

The firm develops client‑specific Investment Policy Statements to document objectives, tax considerations, and risk tolerance, then implements those plans mainly with institutional asset‑class mutual funds and ETFs (including DFA and Avantis products). RIM cites research sources such as DFA white papers and Schwab Institutional materials and typically operates on a discretionary basis, executing trades through its chosen custodian.

A disclosed operational feature is an affiliation between one principal and a separate accounting practice, which the brochure notes could create conflicts of interest and is managed through periodic internal oversight. Also atypical for a small team, the firm manages a relatively large asset base while declining to participate in wrap programs or accept performance‑based fees, relying on third‑party custodians for custody and reporting.

Client services

Financial planning Portfolio management

Expertise

Passive / index investing

Fee options

Percentage

$0 - $1,000,000: 1.00% annually $1,000,001 - $2,000,000: 0.75% annually $2,000,001 - $10,000,000: 0.50% annually $10,000,001+: 0.25% annually

Other

Account minimum: $1,000,000

Main office location

Rational Investment Management, LLC

Mill Valley CA, United States

Number of offices

Most active in

California

Disclosures

Business activities & affiliations

Is active or affiliated with:

Accountant / CPA / tax prep

They offer tax and accounting services, typically for separate fees.

Is not active or affiliated with:

Insurance agent

They sell insurance products and may earn commissions on those sales.

Broker-dealer / trader

They provide brokerage services and may earn transaction-based compensation in addition to advisory fees.

Bank

They're affiliated with a bank that may offer its own financial products and services.

Trust company

They provide trust and estate administration services, typically for separate fees.

Fund sponsor

They manage or sponsor investment funds and may earn management or performance-based fees if clients invest in them.

Lawyer

They provide legal services, typically billed separately.

Real estate agent

They facilitate real estate transactions and may earn commissions.

Other specialized services

They may provide services such as pension consulting or municipal advisory work, typically for separate fees.

Forms ADV

Form ADV Part 2: Client Brochure Form ADV Part 3: Client Relationship

Quick links

Website 415-379-0749

Advisors at this firm

Daniel S

Series 63, Series 65

Mill Valley, CA

Rational Investment Management, LLC

Daniel Sinton is a financial advisor at Rational Investment Management, LLC with 18 years of industry experience. He holds Series 63 and Series 65 licenses and has been with Rational Investment Management since 2012. Rational Investment Management provides discretionary investment supervisory services primarily to individual and high-net-worth clients, focusing on tailored Investment Policy Statements and an investment approach that utilizes institutional asset-class mutual funds and ETFs. The firm manages approximately $351 million in discretionary assets for about 94 clients and serves a range of institutional clients uncommon for firms of its size.

Passive / index investing

Brian P

CFP®

Mill Valley, CA

Rational Investment Management, LLC

Brian Proses is a CFP® professional with 11 years of experience in financial advising. He is a principal at Rational Investment Management, LLC, a firm based in Mill Valley, CA. In addition to his advisory role, he owns and operates Charles W. Proses Accountancy Corporation, an accounting firm. Rational Investment Management provides discretionary investment supervisory services primarily to individual and high-net-worth clients, focusing on tailored Investment Policy Statements and institutional asset-class mutual funds and ETFs. The firm manages approximately $351 million in discretionary assets and serves around 94 clients with ongoing portfolio construction and regular reviews.

Passive / index investing

Not sure where to start?

We'll help you think it through – whether you ultimately need an advisor or not.

Call (201) 292-4557

Warmer provides personalized recommendations and introductions to independent fiduciary advisors. We do not supervise advisors, manage or hold assets, guarantee performance, or provide advice about specific investments.

Each advisor listed on our site is an independent fiduciary responsible for their own advice. Warmer may receive fees from advisors for participation or referrals; these fees are paid by advisors and do not affect the fees clients pay for advisory services.

For advisor listings, we rely on sources including public filings and data provided by advisors, and we cannot guarantee that all information is current or accurate. Please review an advisor's Form ADV and do your own diligence before entering into an advisory relationship.

By using our service, you agree to Warmer's Terms of Service and Advisory Agreement and Privacy Policy. Logos provided by Logo.dev

Find the right match for you

Answer a few quick questions and we'll tailor results to your goals, so you can hire smarter.

Find your advisor

A smarter way to hire an advisor

Compare and choose confidently

Warmer combines best-in-class advisor data with guidance to help you clarify what you need, understand why an advisor may—or may not—fit, and move forward with confidence.

How Warmer works

Thoughtfully vetted, clearly explained

We review rigorously and transparently

Get to know your advisors' credentials, disciplinary history, specialization, client fit, and communication style. We're selective about who we recommend—and tell you why we think someone fits your situation.

Our methodology

Always free and always on your side

Free. Confidence that lasts

We help you book free consultations with your matches. You only pay an advisor if you decide to hire them. And our support doesn't end with an introduction—we're here to make sure the relationship works for you—and if not, to navigate next steps with clarity.

Our ongoing support