Orion Legal Group
2 lawyers · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 764 handling Business & Corporate Law.
Free consultation
Free consultationAbout Orion Legal Group
Orion Legal Group is a small Toronto business law firm founded by Peter Mantas and Matthew Castel, who are managing partners at Orion and also general partners at the investment firm Logos LP. Both are graduates of the BCL/LLB program at McGill University's Faculty of Law. The firm works from First Canadian Place at 100 King Street West in Toronto's Financial District, focusing on corporate, commercial, and transactional legal work for technology and other growth stage companies, along with more established businesses across Canada.
Rather than billing by the hour, Orion prices its work on fixed fees, with payment options that can include subscriptions, project based pricing, deferred payment, volume discounts, or equity. Both founders came to law from outside conventional practice. Mantas held senior product management roles at Wolters Kluwer's legal research group and at Proofpoint, an eDiscovery and archiving company, and worked in the capital markets, alternative investments, and tax groups at McCarthy Tetrault LLP. Castel worked in product and legal roles at the technology companies Clio and Fiix, and practised intellectual property and commercial law at Fasken Martineau and Davis Polk before co-founding Orion.
Practice areas
Milestones & recognition
- Co-founder Peter Mantas founded BOTN.bio (Back of the Napkin Bios), a biotechnology research publication that produces independent investment research.
- Co-founder Peter Mantas previously served on the board of directors of Clinical Laserthermia AB, a company listed on the Nasdaq Stockholm exchange.
- Co-founder Matthew Castel's research on the societal impacts of emerging technology has been cited by the Supreme Court of Canada.
Good to know
Wheelchair accessibleFees & payment
Flat fee
Free consultationLawyers 2
This firm’s lawyers at a glance
- Law schools
- McGill University (2) 2 of 2 lawyers
Who handles what
The neighbourhood
Orion's office is in First Canadian Place, the 72 storey tower at King and Bay Streets in the heart of Toronto's Financial District. Completed in 1975, the building was Canada's tallest for 50 years before being surpassed in 2025, and it's anchored by the Bank of Montreal. Several other Canadian and international law firms, including Osler, Hoskin & Harcourt, Bennett Jones, DLA Piper, and Gowling WLG, also keep offices in the tower, along with a shopping concourse connected to Toronto's underground PATH network.
Orion is a much smaller practice than many of its tower neighbours, with two lawyers who concentrate on fixed fee corporate, commercial, and transactional work for growth stage and technology companies.
Frequently asked questions
- Does Orion Legal Group bill by the hour?
- No. Orion prices its work on a fixed fee basis instead of hourly billing, with payment options that can include subscriptions, project based pricing, deferred payment, volume discounts, or equity.
- Can Orion Legal Group act as our company's outside general counsel?
- Yes. Its General Counsel as a Service offering provides ongoing legal and operational support for a flat monthly fee, covering commercial contracting, corporate transactions, and talent augmentation without the cost of hiring a full time in house lawyer.
- Does Orion Legal Group work with startups and help with fundraising?
- Yes. The firm has an emerging growth practice covering equity issuance, employment matters, commercial contracts, and fundraising support for founders and growth stage companies.
- Does Orion Legal Group handle mergers, acquisitions, and other corporate transactions?
- Yes. Its transaction management service covers debt and equity financing, mergers and acquisitions, business sales, franchise expansion, and corporate reorganizations, and the firm can act as lead counsel or alongside another law firm on a deal.
- Can Orion Legal Group provide extra legal staffing for a specific project?
- Yes. Its talent augmentation service deploys lawyers, paralegals, researchers, and consultants on a fixed fee basis to help in house teams manage contract work, legal research, and RFP or procurement documentation during busy periods.
- Where is Orion Legal Group located?
- The firm's office is in First Canadian Place at 100 King Street West, Suite 5700, in Toronto's Financial District.
Where to find them
First Canadian Place, 100 King Street West, Suite 5700, Toronto, ON M5X 1C7 · 416-849-6199
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Legal AidListing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗