DFX Intelligence

RIA Intelligence

Registered investment advisers, the advisors registered through them, the capital they report, the private vehicles they run and the people who own them, as a graph with a filing date behind every number. RAUM is what the adviser filed, a move is two registration dates, and a class is a rule you can read.

Registered advisor

William Arthur Oneil

Mfs Institutional Advisors Inc.otherBoston, Ma dual registrantIAPD 6983697
Feed of 09/15/2026
Also filed as William Arthur Oneil
At current firm
0 y
since Apr 10, 2026
In the industry
10 y
since Aug 1, 2016 (earliest exam, job or registration)
Prior registered firms
3
IAPD previous registrations
State registrations
1
current, as an IAR
Firms today
1
current registrations
Exams
S66, S63
IA exams only
Book size
not public
not estimated here
Signals
2
dated events on this person
Registration history
IAPD current and previous registrations
Moves
a registration end followed by a registration begin elsewhere
Signals
  • William Arthur Oneil left Putnam Investment Management, Llc for Mfs Institutional Advisors Inc. (registered 2026-04-10)
    May 28, 2024 · Advisor changed firm · fact
  • William Arthur Oneil left Amundi Asset Management Us, Inc. for Putnam Investment Management, Llc (registered 2022-05-25)
    May 6, 2022 · Advisor changed firm · fact
Transition signals

Mobility scoring is not published yet. The observable conditions this page will draw on once the historical validation is done: tenure, the firm’s own departures and ownership changes, new state registrations, a new adviser entity with this person on Schedule A, and colleagues’ moves. Until precision and lead time are measured on known moves, no label is printed. Read the methodology.

Provenance
Source
IAPD individual compilation feedreportedadviserinfo.sec.gov
Firm class
Other adviserderived
Years in industry
10derivedfrom the earliest dated exam, employment or registration
Not published
disclosure flags, outside business text, branch street address