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Just For You Sea, Space, & Sky: 3 Frontier Robotics Stocks Under $20By Jeffrey Neal Johnson. Originally Published: 1/20/2026. 
At a Glance - Redwire Corporation is pivoting to defense while solidifying its backlog as a critical provider of space infrastructure.
- Ondas Holdings is experiencing rapid growth as global demand for its autonomous drone platforms in the security and defense sectors continues to increase.
- Nauticus Robotics has validated its subsea technology and secured strategic partnerships to transition from development to commercial services.
For investors in the technology sector, factory automation has long been a standard trade. For years, investors have flocked to companies that build robots to move boxes in warehouses or weld parts on assembly lines. Now, however, that trade has become crowded and expensive. As we move through January 2026, a quiet but significant rotation is occurring in the capital markets. Smart money is shifting focus toward frontier robotics. Frontier robotics represents a different breed of machine. These are autonomous systems designed to operate in the dirty, dull, and dangerous environments where human labor is either too risky, too scarce, or prohibitively expensive. We're talking about the depths of the ocean, the vacuum of orbit, and the hostile skies of conflict zones. Redwire Corporation: The Infrastructure of Orbit The former CEO of Google calls it the most important thing to happen in 500, maybe 1,000 years of human society. A former U.S. Treasury Secretary says when your great-grandchildren write the history of this period, the political headlines will be the second or third story. The first story is something none of us have seen before. The dot-com collapse, global financial crisis, and COVID-19 pandemic don't compare to what's coming next. We may be entering a period of dramatic, almost unimaginable change. See the full warning and how to prepare now. Redwire Corporation (NYSE: RDW) is distinguishing itself as more than just a space exploration concept; it is becoming a critical infrastructure vendor. Currently trading in the $11–$12 range, the stock recently triggered one of the most reliable bullish signals in finance: insider buying. When company executives are awarded stock as part of their compensation, that's routine. But when those same executives buy shares on the open market with their own money, it sends a powerful message: insiders who know the business best believe the stock is undervalued relative to its future prospects. Redwire's insider trading data for early 2026 is being distorted by the profit-taking activities of a major backer who also holds a board seat. Ae Red Holdings, LLC has sold a significant number of shares this year, likely to realize gains. That substantial selling has created noise around the consistent buying behavior observed from the CEO and other C-suite executives. The executives' continued purchases suggest that, despite institutional shareholders taking profits, those most familiar with the company still believe the stock is underestimated. The financials support this insider confidence. In the third quarter of 2025, Redwire reported revenue of $103.4 million, a 50.7% increase year-over-year. Perhaps more important for long-term investors is the company's backlog, which stands at $355.6 million. A high backlog provides clear visibility into future revenue, indicating that growth is likely to be sustained rather than a one-off event. Redwire has shifted from a pure space-manufacturing firm to a hybrid defense and space infrastructure company. A significant driver of recent growth is the acquisition of Edge Autonomy, which allows Redwire to supply unmanned aerial systems (drones) such as the Stalker and Penguin to defense clients, including the U.S. Army. Simultaneously, its space division continues to lead with Roll-Out Solar Arrays (ROSA) — a preferred power source for the International Space Station and planned commercial stations. For investors, Redwire represents the foundation play in this portfolio: a company bridging stable defense contracts and the high-growth space economy. Ondas Holdings: Breakout Growth in the Sky While Redwire offers stability, Ondas Holdings (NASDAQ: ONDS) represents high-velocity growth. Recent trading data shows a significant spike in unusual call options activity, with volume up 142%. A spike in call option volume often suggests institutional traders are positioning for a near-term breakout, expecting positive news or a sharp move higher in the share price. The fundamentals behind this speculation are grounded in healthy revenue numbers. In Q3 2025, Ondas reported revenue of $10.1 million, a 582% increase compared with the same period a year earlier. That triple-digit growth indicates the company has moved out of testing and into broader commercial deployment. Ondas specializes in drone-in-a-box technology — autonomous docking stations that allow drones to operate without an on-site human pilot. The primary driver for recent demand has been the defense sector. The company's Iron Drone system, designed to intercept and neutralize hostile drones, has seen rising demand amid conflicts in the Middle East and Eastern Europe. Additionally, the acquisition of Apeiro Motion broadens Ondas' capabilities into ground robotics. For investors, Ondas is the growth play: volatile, but with a revenue trajectory that suggests rapid market adoption. Nauticus Robotics: A Turnaround in the Deep The final component of the frontier portfolio lies beneath the ocean. Nauticus Robotics (NASDAQ: KITT) is an aggressive turnaround play, currently trading near $1. The stock recently jumped 8.1% on news of commercial progress, drawing the attention of value-focused investors who specialize in distressed assets. Nauticus aims to replace large, pollution-heavy ships used in offshore energy with small, autonomous robots, but it has faced significant financial headwinds in prior years. Recent price action suggests the market believes the worst may be behind the company. The company recently reached a critical milestone: its flagship robot, Aquanaut, completed deep-sea testing to 2,300 meters, validating its ability to operate under extreme pressure. That success has unlocked commercial opportunities with energy majors such as Shell (NYSE: SHEL) and Petrobras (NYSE: PBR), moving Nauticus from a research lab toward becoming a service provider. Historically, Nauticus' primary risk has been cash burn from hardware development. Management has taken steps to address this. In late 2025, the company completed a debt restructuring and secured a partnership with Forum Energy Technologies. That partnership is a linchpin for the investment thesis: by leveraging Forum's manufacturing capabilities, Nauticus can avoid heavy capital expenditure on factories and instead focus on selling its high-margin software, ToolKITT, and deploying its robot fleet. Investors should view Nauticus as high-risk, high-reward — successful execution could materially reprice the stock. The Dirty, Dull, and Dangerous Premium The rotation into Nauticus, Redwire, and Ondas highlights a broader trend: the search for value in tangible, industrial technology. These companies aren't building consumer gadgets; they're building the infrastructure for the next generation of the global economy. Redwire powers the satellites and stations that connect the world. Ondas secures the skies and monitors critical rail and energy lines. Nauticus services the subsea energy grid. With bullish signals ranging from insider buying to massive revenue spikes, these three stocks under $20 offer a way to diversify a portfolio with exposure to sectors that have high barriers to entry. As 2026 unfolds, the data suggests the frontier robotics sector may finally be hitting its stride.
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