Here is a compiled review of the most material insider purchases and disposals reported on Thursday, September 10, 2026, and surrounding filings dated September 8 and 9, 2026. The disclosures span a range of industries and include both large-scale buys and multimillion-dollar sales executed directly or under pre-arranged trading plans.
Top buys
GameStop Corp. (NYSE: GME) - The most eye-catching transaction from the period was a substantial direct purchase by Ryan Cohen, who serves as President, Chief Executive Officer and Chairman of GameStop. Mr. Cohen acquired 1,000,000 shares of Class A Common Stock for a total of $20,375,900, at a weighted average price of $20.3759 per share. Individual transactions in the block ranged from $20.0199 to $20.4699 per share. Following this acquisition, Mr. Cohen directly holds 39,347,842 shares of GameStop common stock.
The purchase occurred while GameStop was trading at $20.39, which is close to InvestingPro's Fair Value estimate of $20.04 for the company. InvestingPro commentary attached to the filing notes that GameStop's shares have shown significant volatility over the past year, ranging between $17.79 and $28.10, and it assigns the company a "GREAT" financial health score of 3.05 while noting the firm carries more cash than debt on its balance sheet.
Alphatec Holdings, Inc. (NASDAQ: ATEC) - Alphatec's Chief Executive Officer and director Patrick Miles disclosed the purchase of 115,000 shares of common stock on September 10, 2026, for approximately $1,013,150. The weighted average price paid was $8.81 per share, with individual trades priced between $8.73 and $8.84.
The timing of this acquisition is notable in the filing: ATEC has fallen roughly 58% year-to-date and is trading near a 52-week low of $6.82, according to the InvestingPro notes included with the disclosure. InvestingPro analysis lists ATEC on its Most Undervalued list, suggesting the platform views the current share price as depressed relative to the indicated assessment.
Upstart Holdings, Inc. (NASDAQ: UPST) - Paul Gu, Upstart's Chief Executive Officer and a director, acquired 50,000 shares of common stock on September 10, 2026, with the total value reported at $1,277,500. The weighted average price was $25.55 per share, with individual trades spanning $25.505 to $25.585.
At the time of the filing, Upstart's shares were trading near a 52-week low of $23.96 and had declined approximately 43% year-to-date. InvestingPro's commentary included in the disclosure indicates the stock appears undervalued at current levels. The filing further details Mr. Gu's beneficial ownership: he directly holds 1,102,616 shares, some of which are restricted stock units, and indirectly holds 130,000 shares through JECCO, LLC (of which he is a managing member), 44,930 shares through The Paul Xinquan Gu 2021 Gifting Trust, and 70,000 shares through The Gu Qiao Family Trust, for which he serves as trustee.
CarParts.com, Inc. (NASDAQ: PRTS) - Michael Huffaker, the company's Chief Operating Officer, purchased 13,250 shares of common stock on September 10, 2026, at $10.06 per share, amounting to approximately $133,295. Following the transaction, Mr. Huffaker beneficially owns 152,810 shares of CarParts.com common stock.
The filing notes that CarParts.com has delivered a 73.8% year-to-date return, but remains unprofitable and carries a market capitalization of $80.65 million. InvestingPro analysis included with the disclosure indicates the stock appears undervalued according to its Fair Value assessment.
GBank Financial Holdings Inc. (GBFH) - On September 8, 2026, director Michael C. Voinovich purchased 2,500 shares of GBFH common stock at $20 per share, totaling $50,000. After the purchase, Mr. Voinovich directly holds 85,559 shares of the company.
The filing notes that GBFH's shares are trading near a 52-week low of $19.25 and have declined roughly 29% over the past six months. InvestingPro's accompanying analysis marks the stock as appearing undervalued at current levels.
Top sells
Snowflake Inc. (NASDAQ: SNOW) - Director Benoit Dageville reported the disposal of 50,000 shares of Snowflake common stock on September 9, 2026, at $335.72 per share, totaling $16,786,000. Those shares were disposed of indirectly through The Snow Trust, where Mr. Dageville serves as a trustee, and the sale was executed under a pre-arranged 10b5-1 trading plan established on April 3, 2026.
Snowflake's shares have appreciated strongly over recent months, up 84% over the past six months, and were trading at $329.72 at the time of the filing, which is near the director's sale price. InvestingPro's analysis in the disclosure indicates the stock appears overvalued relative to its Fair Value estimate.
Dell Technologies Inc. (NASDAQ: DELL) - Multiple transactions involving significant Silver Lake entities and Dell directors were disclosed on September 8, 2026. SL SPV-2, L.P., identified as a director and 10% owner, sold 49,909 shares of Dell's Class C Common Stock for proceeds totaling $26,326,678, with transaction prices ranging from $515.87 to $537.00 per share. The filing specifies these shares were held indirectly through SL SPV-2, L.P.
On the same date SL SPV-2, L.P. also converted 74,083 shares of Class B Common Stock into an equal number of Class C Common Stock shares at a price of $0 per share as part of sales and in-kind distributions by various Silver Lake entities. Additionally, 97,315 shares of Class C Common Stock were distributed in-kind.
Silver Lake Partners IV, L.P., a substantial shareholder and director, along with Dell director Egon Durban, reported sales of 56,128 shares of Dell Class C Common Stock totaling approximately $30.38 million on September 8, 2026. Those shares were sold at prices between $516.27 and $536.4 per share. Dell's stock was trading at $506.62 in the filing and had declined from a prior close of $535.25, despite a 309% return over the past year. InvestingPro's commentary accompanying the filings characterizes Dell as appearing overvalued relative to its Fair Value estimate, a point that the filings note may have informed the timing of these transactions.
Protagonist Therapeutics, Inc. (NASDAQ: PTGX) - President and Chief Executive Officer Dinesh V. Patel sold common stock totaling approximately $18.2 million between September 8 and September 10, 2026. The sales followed option exercises valued at roughly $2.7 million and were executed under a 10b5-1 trading plan the CEO adopted on January 30, 2026.
Over the three-day period Dr. Patel sold a combined 124,000 shares of Protagonist Therapeutics common stock, with sale prices ranging from $142.00 to $151.27 per share. The filing breaks down the sales as follows: on September 8, 54,174 shares were sold at a weighted average price of $145.87; on September 9, 63,548 shares were sold at a weighted average price of $146.18; and on September 10, 7,278 shares were sold at a weighted average price of $144.10. At the time of the filings, PTGX was trading near $145 and had gained 143% over the past year, with a market capitalization of $9.4 billion. InvestingPro's accompanying analysis indicates the stock currently appears overvalued relative to its Fair Value estimate.
CoreWeave, Inc. (NASDAQ: CRWV) - Michael N. Intrator, Chief Executive Officer and President of CoreWeave, sold 307,592 shares of the company's Class A Common Stock on September 8, 2026, under a Rule 10b5-1 trading plan adopted on November 20, 2025. The sales generated approximately $30,794,542, with weighted average prices ranging from $93.3484 to $104.435 per share. The filing details that the sales included shares held directly by Mr. Intrator and shares held indirectly through Omnadora Capital LLC, for which he serves as the sole manager of its manager, Omnadora Management LLC, and which he is deemed to beneficially own.
Following the sales, the stock had declined to $89.12 and was trading below the CEO's sale prices. The filing also includes InvestingPro data indicating that although the company has a market capitalization of $52.4 billion and reported revenue growth of 115%, it is burning through cash and remains unprofitable.
Context and what the filings indicate
The filings for these companies include both direct purchases by insiders and disposals made under structured trading arrangements such as 10b5-1 plans. The disclosures show a mixture of insider behavior: high-profile purchases by chief executives and directors in a range of companies that InvestingPro flags as undervalued at current prices, alongside sizable sales by directors and large shareholders at companies that InvestingPro assesses as trading above Fair Value.
Specific items of note from the filings include the concentration of activity in names across retail and consumer (GameStop), medical devices or health-related equipment (Alphatec), financial technology (Upstart), auto parts e-commerce (CarParts.com), community banking (GBank), cloud data and analytics (Snowflake), enterprise hardware and services (Dell), biotech (Protagonist Therapeutics) and AI-driven infrastructure (CoreWeave). The filings reference the market price context for several of the transactions - including trading near 52-week lows or highs, and year-to-date performance figures - and attach InvestingPro commentary on valuation and financial health metrics where applicable.
Investors and observers often monitor such insider activity for signals about managements' and major shareholders' perspectives on valuation and liquidity. The filings in this batch include both purchases consistent with an expression of confidence by insiders and substantial sales executed under prearranged plans or in connection with private equity holdings and conversions, which may reflect portfolio management or strategic distribution rather than a vote on business prospects.
Closing note
The collection of filings filed around September 8-10, 2026, demonstrates a broad range of insider motives and outcomes: large purchases concentrated in companies InvestingPro flagged as undervalued, and sales at companies where InvestingPro signals stretched valuations. These transactions should be weighed alongside other fundamental and market information when making decisions, as insider trades can be driven by a variety of personal, tax, liquidity or corporate-ownership factors that are not fully disclosed in transactional filings.
Maintaining visibility on significant insider disclosures can help market participants understand one element of sentiment among executives and large shareholders, but the filings are best interpreted as part of a broader analysis rather than definitive directional indicators on their own.