| Ford Motor Company Of Canada, Limited CA-E-4ETY-NFAE | Federal corporation | Inactive | OAKVILLE | $16.2B |
| Commissionaires CA-E-VSKV-RZD9 | Licensed business | Cancelled | Toronto | $8.3B |
| Commissionaires (Great Lakes) CA-E-PHDZ-36W6 | Federal not-for-profit corporation | Active | Toronto | $1.2B |
| Hoskin Scientific Limited CA-E-EPA1-13B5 | Federal corporation | Dissolved | OAKVILLE | $696.6M |
| IDEMIA Identity & Security Canada, Inc. CA-E-11NN-XCN9 | Federal corporation | Active | Oakville | $214.6M |
| Atlas Van Lines (canada) LTD. CA-E-MHBR-3B0M | Federal corporation | Active | OAKVILLE | $177.2M |
| Halton Multicultural Council INC CA-E-JAZN-Y35K | Registered charity | Former | OAKVILLE | $119.1M |
| Sandhill Consultants Canada LTD. CA-E-9FRQ-0ZET | Federal corporation | Active | Oakville | $103.3M |
| Siemens Canada Limited CA-E-QHVK-EE2M | Federal corporation | Active | OAKVILLE | $63.7M |
| Vanco Electrical Supplies Ltd. CA-E-E6BZ-H36W | Federal corporation | Inactive | OAKVILLE | $58.6M |
| Totem Inc. CA-E-C5H6-51HQ | Federal corporation | Dissolved | Oakville | $55.4M |
| Royal Moving & Storage INC. CA-E-J4YM-TG1B | Federal corporation | Active | OAKVILLE | $49.5M |
| Millipore (canada) LTD. CA-E-J04V-SQFB | Federal corporation | Dissolved | Oakville | $40.6M |
| Sterling Crane INC. CA-E-471M-YJHH | Federal corporation | Inactive | OAKVILLE | $31.8M |
| Siemens Healthcare Limited CA-E-DE6H-DHV2 | Federal corporation | Active | Oakville | $30.0M |
| Opportunity International Canada CA-E-06WN-A2AJ | Registered charity | Active | Oakville | $20.9M |
| GeneBio Systems, Inc. CA-E-KFJ8-GTDF | Federal corporation | Active | Oakville | $7.3M |
| Avensys Solutions INC. CA-E-AAZZ-GBM4 | Federal corporation | Active | Oakville | $3.7M |
| Kerr Street Community Services CA-E-APEN-VC1H | Registered charity | Current | OAKVILLE | $2.9M |
| Front Line Outreach CA-E-WXWV-CJ7P | Registered charity | Active | Oakville | $2.3M |
| Black Mentorship Inc. CA-E-66D7-1ZH5 | Registered charity | Active | Oakville | $2.1M |
| Lions Foundation Of Canada Dog Guides CA-E-ABQ4-R0FF | Registered charity | Active | Oakville | $1.4M |
| The Women's Centre of Halton CA-E-PNKJ-TMS8 | Registered charity | Active | OAKVILLE | $531K |
| Chartwell Baptist Church CA-E-4972-Q4B6 | Registered charity | Active | OAKVILLE | $513K |
| Mothers Against Drunk Driving (MADD Canada) - CA-E-DVMS-6FAP | Registered charity | Active | OAKVILLE | $474K |
| Islamic Circle of North America CA-E-TWWM-NNK4 | Registered charity | Active | Oakville | $229K |
| River Oaks Community Church CA-E-AK6W-SPPK | Registered charity | Active | OAKVILLE | $151K |
| True North Aid CA-E-ZQ6P-RDB4 | Registered charity | Active | Oakville | $101K |
| H2o4all CA-E-VFFD-BWFQ | Registered charity | Active | Oakville | $91K |
| Trafalgar Oaks Child Care & Learning Centre CA-E-ZMY8-PJ17 | Registered charity | Active | Oakville | $77K |
| Re-Imagine Ontario CA-E-RHSJ-N97N | Registered charity | Active | Oakville | $72K |
| The Meeting House Church Family CA-E-2BGF-7NGS | Registered charity | Dissolved | OAKVILLE | $42K |
| Saint Peter and Saint Paul Coptic Orthodox Church of Oakville CA-E-JA96-9G7G | Registered charity | Active | Oakville | $42K |
| Oakville Parent-Child Centre CA-E-N0KV-996T | Registered charity | Active | Oakville | $41K |
| Saint Mark and Saint Demiana Coptic Orthodox Church CA-E-N0AJ-KSQN | Registered charity | Active | Oakville | $33K |
| Canadian Digestive Health Foundation CA-E-K42K-NYC7 | Registered charity | Active | Oakville | $31K |
| Muslim Association of Milton CA-E-DZY8-MMAA | Registered charity | Active | OAKVILLE | $25K |
| Melanoma Canada CA-E-PGC1-6WWW | Registered charity | Active | Oakville | $22K |
| Adventure Valley Outdoor Education CA-E-VS41-38GJ | Registered charity | Active | Oakville | $22K |
| Oakville Hospital Foundation CA-E-A4X2-HPYC | Registered charity | Active | OAKVILLE | $20K |
| Beneficent Relief CA-E-9PV4-1Z2Y | Registered charity | Active | Oakville | $15K |
| SoChange Foundation CA-E-56WX-XRBS | Registered charity | Active | Oakville | $5K |
| Firefighters Without Borders CA-E-TVB9-4JXS | Registered charity | Active | Oakville | $4K |