The Dow Jones closed slightly higher on Friday. When insiders purchase or sell shares, it indicates their confidence or concern around the company's prospects. Investors and traders interested in penny stocks can consider this a factor in their overall investment or trading decision.

Below is a look at a few recent notable insider transactions for penny stocks. For more, check out Benzinga's insider transactions platform.

One Stop Systems

• The Trade: One Stop Systems, Inc. (NASDAQ:OSS) CEO Michael Knowles acquired a total of 1,130 shares an average price of $1.80. To acquire these shares, it cost around $2,034.
• What's Happening: One Stop Systems reported worse-than-expected second-quarter revenue results and issued third-quarter revenue guidance below estimates.
• What One Stop Systems Does: One Stop Systems Inc designs and manufactures innovative Artificial intelligence (AI) Transportable edge computing modules and systems, including ruggedized servers, compute accelerators, expansion systems, flash storage arrays and Ion Accelerator SAN, NAS and data recording software for AI workflows.

Thunder Mountain Gold

• The Trade: Thunder Mountain Gold, Inc. (OTC:THMG) CEO Eric T Jones acquired a total of 40,000 shares at an average price of $0.05. The insider spent around $2,054.
• What's Happening: The company's stock dipped 54% over the past six months.
• What Thunder Mountain Gold Does: Thunder Mountain Gold Inc is a mineral exploration stage company. It is engaged in exploring mining properties that have the potential to produce gold, silver, base metals, and other commodities.

ReWalk Robotics

• The Trade: ReWalk Robotics Ltd. (NASDAQ:RWLK) Director Jeff Dykan acquired a total of 25,000 shares at an average price of $0.61. To acquire these shares, it cost around $15,195. The company's 10% owner bought 46,199 shares, while Director sold 9,582 shares.
• What's Happening: ReWalk Robotics posted a wider-than-expected quarterly loss.
• What ReWalk Robotics Does: ReWalk Robotics Ltd is an Israel based medical device company. It is engaged in designing, developing and commercializing the Rewalk systems which are exoskeletons allowing wheelchair-bound individuals to stand and walk once again.

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STRATA Skin Sciences

• The Trade: STRATA Skin Sciences, Inc. (NASDAQ:SSKN) 10% owner Aron English acquired a total of 1,853,056 shares at an average price of $0.55. The insider spent $1.02 million to buy those shares.
• What's Happening: Strata Skin Science posted a wider-than-expected quarterly loss.
• What STRATA Skin Sciences Does: Strata Skin Sciences Inc is a medical technology company engaged in developing and commercializing products for the treatment of dermatological disorders.