Identifying the "best" blue-chip stock on the TSX with insider buying for today, September 10, 2025, requires a multi-faceted approach, considering both the definition of a blue-chip stock and the significance of insider activity. While there isn't a single definitive "best" stock, several companies on the TSX exhibit characteristics that align with this query.

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Blue-chip stocks are generally defined as large, well-established, and financially sound companies with a long history of stable earnings and reliable dividends. They are often market leaders in their respective industries and are considered less volatile than smaller, growth-oriented companies. Insider buying, on the other hand, refers to purchases of a company's stock by its executives, directors, or other employees who have access to non-public information. This activity is often seen as a positive signal, indicating that those closest to the company believe its stock is undervalued or that its future prospects are strong.[1] [2]

Several TSX-listed companies demonstrate a combination of blue-chip characteristics and recent insider buying activity as of September 10, 2025:

5N Plus (TSX:VNP): This company, which produces and sells specialty semiconductors and performance materials, has seen significant insider purchases over the past year. This insider confidence is coupled with a successful transition from loss to profitability and an expanded supply agreement with First Solar, a major catalyst for future growth. While not traditionally a "blue-chip" in the sense of a long-established, massive corporation, its strong financial turnaround and insider commitment make it a compelling option for stability and growth potential. Analysts project significant revenue and earnings growth for 5N Plus by 2028, with a fair value indicating a substantial upside.[3]

Orla Mining (TSX:OLA): As a company involved in the acquisition, exploration, development, and exploitation of mineral properties, Orla Mining exhibits strong growth potential with projected annual revenue growth outpacing the Canadian market. While there hasn't been substantial recent insider buying, insiders have been net buyers over the past three months, indicating continued confidence. Its South Railroad Project in Nevada is a key organic growth strategy, aiming for significant annual gold production. Orla Mining's market capitalization of CA$4.27 billion and its operational focus on mineral properties contribute to its blue-chip appeal within the materials sector.[4]

Canfor Corporation (TSX:CFP): This integrated forest products company has seen substantial insider buying over the past three months, signaling strong confidence in its growth prospects. Canfor operates across North America, Asia, and Europe, with significant revenue from its Lumber and Pulp & Paper segments. Despite recent net losses, the company aims for profitability within three years, and its strategic adjustments, including a share repurchase program, underscore its commitment to long-term stability. Its market capitalization of CA$1.56 billion and diverse operations align with blue-chip characteristics.[5]

Parex Resources Inc. (TSX:PXT): This Colombia-focused oil and gas firm has seen significant insider buying, with three insiders purchasing over $650,000 worth of shares in the public market over the past six months. Parex also has a strong dividend yield and has been actively buying back shares, which, when combined with insider purchases, indicates strong management conviction in the company's value and future. Its ability to cover dividend distributions with cash from operations further solidifies its financial stability, a key blue-chip trait.[6]

South Bow Corp. (TSX:SOBO): As an oil and liquids pipeline operator, South Bow Corp. has experienced a notable bounce in its stock price, accompanied by significant insider buying. Over the past six months, insiders have been net buyers of nearly $1 million worth of stock, and insider equity holdings have risen by 30%. The company also offers a strong dividend yield, which is well-covered by its cash flow from operations. This combination of insider confidence, financial health, and a stable operational sector makes it a strong contender.[6]

Automotive Properties Real Estate Investment Trust (TSX:APR.UN): This REIT, which holds a portfolio of automotive dealership properties, has seen three insiders spend over $1 million acquiring trust units in the public market over the past six months. The REIT provides a consistent monthly distribution, well-supported by its cash flow from operating activities. Insider conviction in this REIT's prospects, coupled with its stable real estate holdings, positions it as a reliable investment for income and potential capital appreciation, aligning with blue-chip investment principles.[6]

While other companies like Vitalhub (TSX:VHI) and Robex Resources (TSXV:RBX) show strong growth potential and insider ownership, their smaller market capitalization or more volatile operational profiles might place them outside the traditional definition of a "blue-chip" stock, which typically implies a higher degree of established stability and market leadership.[4] Similarly, Lightspeed Commerce (TSX:LSPD) is a growth company with insider ownership, but its recent net losses and focus on future profitability might not align with the immediate "stability" aspect often associated with blue chips.[5]

It is important to note that while insider buying is a positive indicator, it is not a guarantee of future stock performance. Investors should conduct thorough due diligence, considering valuation, financial health, industry trends, and overall market conditions before making investment decisions.[1] [2]