Overview
Regulatory filings made public on Tuesday reveal a varied pattern of insider transactions among U.S.-listed firms. The day’s notable activity includes concentrated private-placement purchases by senior leadership at Quoin Pharmaceuticals, follow-on buying at smaller-cap names, and large-volume sales by several corporate insiders and major shareholders. Below is a company-by-company breakdown of the largest reported moves and the context provided in the filings.
Top buys
Quoin Pharmaceuticals, Ltd. (NASDAQ:QNRX)
Two of Quoin Pharmaceuticals’ senior executives participated in the issuer’s private placement on August 31, 2026, acquiring American Depositary Shares (ADSs) and accompanying warrants at a set price of $4.88 per ADS. Chief Operating Officer and director Denise P. Carter purchased 20,490 ADSs and the related warrants in the private placement, for a total transaction value of $99,991. Each ADS represents thirty-five ordinary shares of Quoin Pharmaceuticals.
The filing notes the stock subsequently traded at $6.51, representing a gain of over 33% from Ms. Carter’s purchase price. The same private placement attracted participation from Chief Executive Officer and Director Michael Myers, who acquired an identical quantity of 20,490 ADSs at the same $4.88 per-ADS price for a total of $99,991 on August 31, 2026. The filing states the stock reached $6.51 after the purchase, equating to a 26% gain from Mr. Myers’ purchase price. Following his transaction, Mr. Myers directly holds 37,713 ADSs. The filings reiterate that each ADS corresponds to thirty-five ordinary shares.
CuriosityStream Inc. (NASDAQ:CURI)
CuriosityStream’s President, CEO and Director Clinton Larry Stinchcomb reported a purchase of 20,000 shares of the company’s common stock on August 28, 2026. The transaction was executed at prices between $2.56 and $2.62 per share and totaled $52,060. The filing places the purchase in the context of the stock trading near its 52-week low of $2.30 and notes the share price is down roughly 26% year-to-date.
According to the filing’s accompanying analysis, the stock appears undervalued at current market levels and the company offers a dividend yield reported at 12.69%. After the acquisition, Mr. Stinchcomb directly holds 3,021,260 shares of CuriosityStream common stock.
FTC Solar, Inc. (NASDAQ:FTCI)
Director Shaker Sadasivam increased his ownership of FTC Solar common stock on August 28, 2026, acquiring 101,083 shares in transactions totaling approximately $271,913. Share prices in the trades ranged from $2.460 to $2.900, with a weighted average purchase price of $2.69. Following the purchases, Mr. Sadasivam directly holds 255,464 common shares.
The filing highlights that while the stock produced an 18% return over the past week, it remains down 78% year-to-date. An accompanying analysis indicates FTC Solar appears undervalued based on its Fair Value assessment and is listed among stocks identified as Most Undervalued.
Motorsport Games Inc. (NASDAQ:MSGM)
Red Oak Partners, LLC, identified as a 10% owner and director, disclosed purchases of Class A common stock in late August 2026 totaling $47,629. The purchases were executed over several days at prices ranging from $3.90 to $3.931 per share. The filing notes the company’s stock has returned 37% over the past year and trades at $3.88, which is below the cited Fair Value of $4.76.
Specifically, on August 27, 2026, Red Oak Partners purchased 2,146 shares at $3.90 per share for The Red Oak Fund, LP, and 1,134 shares at the same price for The Red Oak Long Fund, LP. The filings indicate that these purchases were executed through multiple trades at prices between $3.895 and $3.900.
Top sells
Airbnb, Inc. (NASDAQ:ABNB)
Chief Strategy Officer and Director Nathan Blecharczyk reported significant sales of Airbnb shares in filings that cover transactions executed on August 28 and August 31, 2026. The disclosures indicate Mr. Blecharczyk sold shares valued at approximately $13.45 million across multiple trades.
On August 28, Mr. Blecharczyk sold 45,215 shares of Class A Common Stock at prices ranging from $190.00 to $190.96 per share. The filings also show an additional 11,945 shares were sold that same day at prices between $191.00 and $191.36 per share. The stock was reported to be trading near its 52-week high of $193.45 and has delivered a 43% return over the past year.
ORTHOPEDIATRICS CORP (NASDAQ:KIDS)
Squadron Capital LLC, identified as a 10% owner and Director, sold a total of 336,831 common shares in transactions conducted on August 28 and September 1, 2026. The sales produced proceeds of approximately $7.76 million, with weighted average prices cited between $23.04 and $23.10 per share.
The filings note the stock has delivered a year-to-date gain of 29.5% and a six-month return near 20%. The accompanying analysis in the disclosure states that KIDS appears overvalued relative to its Fair Value and reports a market capitalization of $608.6 million. Squadron Capital LLC’s filings indicate the shares were sold to provide additional capital for other portfolio businesses.
Oruka Therapeutics, Inc. (NASDAQ:ORKA)
Chief Executive Officer and Director Lawrence Otto Klein sold common stock valued at approximately $6.89 million on September 1, 2026, under a Rule 10b5-1 trading plan established on May 14, 2026. The filings characterize the sales as occurring after a substantial 492% return over the past year, while noting the stock declined 7.4% in the week prior to the transactions.
Mr. Klein sold a total of 75,000 common shares in several transactions. Prices across the trades ranged from $90.27 to $92.59 per share. The filings break down the sales as follows: 6,604 shares sold at a weighted average price of $90.7868 within a range of $90.27 to $91.26; 63,596 shares sold at a weighted average price of $91.8963 within a range of $91.28 to $92.27; and 4,800 shares sold at a weighted average price of $92.4357 within a range of $92.31 to $92.59. The contemporaneous analysis included in the filings reports ORKA appears overvalued relative to its Fair Value.
Aura Minerals Inc. (NASDAQ:AUGO)
Director Bruno Sousa Mauad, acting through Kapitalo Investimentos, reported both sales and purchases of Aura Minerals common shares on August 28, 2026. The filings show common shares sold totaling approximately $13.66 million and common shares acquired totaling approximately $21.79 million. The disclosures describe the net activity as buying overall.
The filings describe Aura Minerals as a $7 billion mining company that has returned 171% over the past year. The director’s sales consisted of 157,500 common shares at prices ranging from $84.415 to $87.4672 per share, producing total proceeds of $13,660,267. The accompanying analysis in the filings states the stock appears undervalued at current levels according to a Fair Value assessment.
Caterpillar Inc. (NYSE:CAT)
Chief Executive Officer Joseph E. Creed reported the sale of 32,901 shares of Caterpillar common stock on August 28, 2026. The sales were executed at prices ranging from $800.19 to $813.72 per share and generated proceeds of approximately $26,211,763. The filings place the transactions in the context of Caterpillar stock having produced a 92% return over the past year, while noting the shares were trading at $776.93 at the time of the filing, below the prices at which Mr. Creed sold.
The disclosures also note Mr. Creed exercised 44,403 employee stock options on the same date at an exercise price of $219.76 per share, resulting in an acquisition of shares valued at approximately $9,758,003. The filings identify the relevant options as having been granted under the Caterpillar Inc. 2014 Long-Term Incentive Plan on March 1, 2021, and state that the options vested in equal increments over three years.
Context and takeaways
The filings published on Tuesday offer a snapshot of how company insiders and large shareholders are managing their positions. Some purchases occurred when share prices were close to recent lows, and some sales followed strong multi-month or multi-year rallies. Several of the disclosures include third-party analysis that classifies the respective stocks as undervalued or overvalued relative to a stated Fair Value.
It is worth noting that insiders may sell shares for a variety of reasons that the filings do not always detail, including portfolio rebalancing, capital needs, tax planning or pre-arranged trading plans. Purchases by executives and directors can indicate confidence, but the filings alone do not provide a definitive signal about future company performance.
Monitoring note
Investors reviewing insider filings should consider these disclosures as one input among many when assessing an equity’s risk and return profile. The filings provide precise transaction details - dates, prices, volumes and holding changes - that can be incorporated into broader fundamental and valuation analyses.