OSK on Toronto Stock Exchange

Osisko Mining

Logo: Osisko Mining, Public domain, via Wikimedia Commons5

Canadian mining company

Osisko Mining Inc. (formerly Oban Mining Corporation) is a Canadian company that conducts mineral exploration work with a focus on seeking to develop a gold mine in Ontario or Quebec. It adopted its name following the 2015 merger of five companies that resulted in the re-uniting of the executive management team of the original Osisko Mining Corporation. On October 25, 2024, Gold Fields completed the acquisition of Osisko Mining for $1.39 billion.3 Its shares trade on Toronto Stock Exchange under the symbol OSK.1 Wikipedia text CC BY-SA 4.0

$134.84 up 1.93 (1.45%)Price as of Oct 21, 2026 at 18:59 UTC

Last updated Oct 21, 2026.

Overview

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Osisko Mining Inc. (formerly Oban Mining Corporation) is a Canadian company that conducts mineral exploration work with a focus on seeking to develop a gold mine in Ontario or Quebec. It adopted its name following the 2015 merger of five companies that resulted in the re-uniting of the executive management team of the original Osisko Mining Corporation.3

Corporate structure

Osisko Mining sits at the top of its group. 1 entity, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

Major holders of Osisko Mining

  • Osisko Mining A8

Built from major holders from Schedules 13D and 13G. Each entity in the chart links to its source.

The story

The new Osisko Mining Corporation is the continuation of Oban Mining Corporation, which itself was the result of the 2014 merger between two Toronto Stock Exchange-listed mineral exploration companies active in South America, Braeval Mining Corporation and Oban Exploration Limited.

The other mineral exploration companies involved in the 2015 merger were the TSX Venture Exchange-listed companies Eagle Hill Exploration whose Windfall Lake project would become Osisko's principal project, Temex Resources who brought with it net smelter return royalties on the Canadian Malartic Mine and Goldcorp's Éléonore mine, as well as Corona Gold and Ryan Gold whose primary assets were cash and securities.

With John Burzynski emerging as the CEO, Oban would acquire TSX-Venture listed companies Northern Gold Mining, for its Golden Bear project in Ontario, and NioGold Mining Corporation, for its Marban project in Quebec, before it re-named itself to Osisko Mining Corporation in June 2016.

In 2018, the company was re-aligned its board of directors. In 2019, Osisko acquired the Stornoway Diamond Corporation for its Renard diamond mine, and through its subsidiary O3 Mining Inc. acquired Alexandria Minerals Corporation.

On October 25, 2024, the acquisition of Osisko Mining for $1.39 billion by Gold Fields was completed.

From Wikipedia’s article on Osisko Mining, shared under CC BY-SA 4.0.6

Calendar

Coming up

  1. Oct 29, 2026 · Before the openReports results for the quarter ending Sep/2026 A year earlier it reported $3.20 a share, on Oct 29, 2025.7

Upcoming dates from Nasdaq's calendar; past results from the company's 8-K filings (Item 2.02). The full markets calendar

Filings

1 filings to the SEC since October 2021: 1 large holders. The latest 1:

  1. Feb 14, 2023SC 13G/A EDGAR

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

Major holders

Investors who own more than 5% of the shares must tell the SEC: a 13D if they may seek to influence the company, a 13G if they hold passively.

SEC filer profile

How Osisko Mining is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

  • Name on EDGAROSISKO MINING Corp2
  • CIK0001488681
  • Incorporated inQuebec, Canada2
  • Fiscal year endsDecember 312
  • Industry code (SIC)1040 Gold and Silver Ores2
  • Business address1100, Rue De La Gauchetiere Oust, Bureau 300, C.P. 211, Montreal, A8 H3B 2S22
  • Phone514-735-71312
  • On EDGAR sinceApr 7, 20102
  • Filings15 in all: CB/A (5), 425 (4), F-X (2), SC 13G/A (2), CB (1), F-8 (1)2

Sources

The numbers on this page point here. Each one links to the record it came from.

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    Yahoo FinanceOSK quote
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