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William C O'brien

CRD# 4908752·Registered 2005 - 2022
Previously Registered: Being a previously registered professional could mean that William is no longer operating under the supervision of the SEC or FINRA. That means that the Securities and Exchange Commission may not be able to oversee the services that this specific professional is providing.

Professional Summary

William C O'brien, who also goes by William C Obrien, was a registered financial advisor. William was a previously registered financial professional and started their career in finance 2005 - 2022. William had worked at 5 firms and has passed the Series 65, Series 66 and Series 7 exams.

At a Glance

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Fiduciary Standard

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Fee Structure

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Account Minimum

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Active Clients

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Other Aliases

William C Obrien

Blog Corner

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Videos & Posts

This advisor has not added any videos or posts yet.

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Contact Information

No current employment

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Disclosures are events reported to regulators, such as customer disputes, regulatory actions, employment separations, or financial events. Some are resolved, denied, or contested — a disclosure is not a verdict. We recommend asking an advisor directly about any disclosure on their record.

Disclosures on record.

Disclosures can be potential red flags, including customer disputes, regulatory fines, employer terminations, bankruptcies, judgments, liens, or certain criminal activities. Check for any disclosures as part of your thorough research when choosing an advisor.

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Years of Experience

21 years in the financial services industry

Current & Past Employments

SEI INVESTMENTS MANAGEMENT CORP·CRD# 105146
RIA
Oaks, PA
December 18, 2019 - February 15, 2022
RAYMOND JAMES FINANCIAL SERVICES ADVISORS, INC·CRD# 149018
RIA
Lancaster, PA
November 17, 2009 - November 1, 2010
RAYMOND JAMES FINANCIAL SERVICES, INC.·CRD# 6694
BD
Lancaster, PA
November 13, 2009 - November 1, 2010
NEW ENGLAND SECURITIES·CRD# 615
RIA
Newtown Square, PA
June 20, 2007 - November 11, 2009
NEW ENGLAND SECURITIES·CRD# 615
BD
Newtown Square, PA
May 18, 2007 - November 11, 2009
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED·CRD# 7691
RIA
Exton, PA
April 22, 2005 - February 20, 2007
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED·CRD# 7691
BD
Exton, PA
March 18, 2005 - February 20, 2007

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Current Firm

SI
SEI INVESTMENTS MANAGEMENT CORP

GOAL INVESTOR | SEI PRIVATE WEALTH MANAGEMENT | SEI INVESTMENTS MANAGEMENT CORP | SEI HUNTINGTON STEELE | SEI FIXED INCOME PORTFOLIO MANAGEMENT | SEI ADVISOR NETWORK | GOALINVESTOR

CRD#: 105146 / SEC#: 801-24593
RIA
Registered Investment Advisory firm - SEC (6/27/1985 Approved)

Contact Information

Main Address

One Freedom Valley Drive, Oaks, PA 19456

Phone Number

(610) 676-1000

# of Employees

434

SEC notice filing (53 States and Territories)

Registered to provide investment advisory services in 53 US states and territories.

Documents

Customer Relationship Summary (CRS / SEC)Latest Form ADV

Part 2 Brochures

SIMC FORM ADV PART 2A - INDEPENDENT ADVISOR SOLUTIONS BY SEI (9/1/2026)

Regulatory Assets Under Management

Total Number of Accounts

112,627

AUM (Assets Under Management)

$216,428,500,660

Accountant Surprise Examination Report

Filing DateForm ADV-E CoverForm ADV-E Report
10/27/2025Cover PageReport
01/27/2025Cover PageReport
10/25/2023Cover PageReport

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Other business activities

Information obtained from regulatory filings. Advisors can request corrections through their firm or regulator.

Outside business activity is any business or activity undertaken by an advisor that is outside the scope of their relationship with their firm (e.g., consulting services, real estate, freelance work, teaching, etc.). Investors should stay informed about these activities to ensure no conflicts of interest.

The advisor shows no other business activity.

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Primary Firm SEC Registration

This SEC-registered firm can serve clients nationwide. Some states may require the firm to submit a notice filing if the firm has more than 5 clients or a physical office there. You can view these state-level filings under the section titled "State Registrations and Notice Filings".
SI
SEI INVESTMENTS MANAGEMENT CORP

GOAL INVESTOR | SEI PRIVATE WEALTH MANAGEMENT | SEI INVESTMENTS MANAGEMENT CORP | SEI HUNTINGTON STEELE | SEI FIXED INCOME PORTFOLIO MANAGEMENT | SEI ADVISOR NETWORK | GOALINVESTOR

CRD#: 105146 / SEC#: 801-24593
RIA
Registered Investment Advisory firm - SEC (6/27/1985 Approved)

State Registrations and Notice Filings

Listed states reflect where the advisor is authorized to serve clients under state regulations.
This advisor is not registered in any state.

Don't see your state listed? The advisor may still be able to work with you under the federal De Minimis Rule, which allows up to five investment advisory clients in a state without registration. Some states, like TX, LA, NE, and NH, may still require registration or notice filing. Contact the advisor or their firm to confirm their investment advisory availability in your state.

Exams

Financial professionals may take different exams throughout their careers based on the types of services they provide and roles they perform.

Series 65 — Uniform Investment Adviser Law Examination

Passed Dec 2019About the Series 65 exam

Series 66 — Uniform Combined State Law Examination

Passed Apr 2005About the Series 66 exam

Series 7 — General Securities Representative Examination

Passed Mar 2005About the Series 7 exam

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CRS (Client Relationship Summary)

The CRS(Customer Relationship Summary) document is not provided.

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