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Just For You

RKLB, ASTS, TDG: Insiders are Selling These 3 Space Stocks

Authored by Leo Miller. Publication Date: 12/22/2025. 

Summary

• Rocket Lab’s heavy insider selling looks less alarming because nearly all sales came through a prearranged trading plan.
• AST SpaceMobile faces the most concerning signal after American Tower cut its stake by nearly half in discretionary sales.
• TransDigm’s insider selling is sizable but limited to one director, making it only a modest bearish indicator.

Some of the most talked-about space stocksamong retail investors have seen recent bouts of insider selling. Below, we’ll detail the selling surrounding Rocket Lab (NASDAQ: RKLB) and AST SpaceMobile (NASDAQ: ASTS). We’ll also examine the insider sales at a stalwart of the aerospace industry, TransDigm (NYSE: TDG).

RKLB CEO Sells Over $150 Million Worth of Shares

First up is Rocket Lab, which has surged roughly 177% in 2025. The stock has seen significant insider selling in December, largely from the firm’s founder and CEO, Peter Beck. In December, Beck’s total sales amounted to about $141 million.

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The company also recorded sales from its lead independent director, Merline Saintil, though those were much smaller — roughly $1.7 million in total.

There’s another important distinction: all of Beck’s sales were executed under a prearranged 10b5-1 plan. Because 10b5-1 transactions are set up in advance, they typically do not provide a strong near-term bearish signal.

About $1.43 million of Saintil’s sales were not part of a predetermined plan. That introduces a slightly more cautionary signal, but the amount is modest relative to Beck’s sales and Rocket Lab’s market capitalization.

In short, while the headline dollar figures are large, the prevalence of 10b5-1 selling at Rocket Lab means the activity doesn’t necessarily indicate imminent downside.

Big-Name Shareholder Cuts ASTS Position Nearly in Half

Despite volatility in 2025, AST SpaceMobile’s shares have rallied significantly, rising more than 250% year to date.

American Tower (NYSE: AMT), one of the world’s largest owners and operators of telecommunications real estate, is a large shareholder of ASTS. American Tower recently sold just under $160 million worth of shares — a transaction that dwarfs previous insider sales at ASTS. These sales were not executed under a predetermined plan, which amplifies their potential bearish implications.

American Tower holds both Class A and Class B shares of AST SpaceMobile; Class B shares are convertible into Class A on a one-for-one basis.

Before the sale, the company held roughly 2.5 million Class A shares and 2.17 million Class B shares, for a combined effective position of about 4.67 million shares. After selling roughly 2.29 million Class A shares, American Tower’s effective stake fell to roughly 2.38 million shares — a 49% reduction.

Given American Tower’s deep expertise in telecommunications infrastructure, the scale and discretionary nature of this sale stand out. It suggests that a highly informed strategic investor chose to materially reduce exposure after the stock’s dramatic run, which is a noteworthy signal for other investors.

TDG Insider Ups Sales Big Time in December

TransDigm is a key supplier in the commercial aerospace chain, providing parts to firms like Boeing (NYSE: BA). The company posts an impressively high gross margin of around 60%, reflecting significant pricing power over its customers. While TransDigm has returned only about 8% in 2025 so far, its three-year return is roughly 147%.

In December, TransDigm insiders have sold approximately $157 million in shares to date. Notably, about $127 million of that selling came from Robert Small, a member of the company’s board, and those sales were not made under a 10b5-1 plan.

Large discretionary sales by a board member are not a positive sign, but outside of CEO Michael Lissman’s modest $2.6 million sale in November, Small appears to be the only TransDigm insider making substantial discretionary sales recently. Because the activity is concentrated in one individual, it is only a mildly bearish signal for the company overall.

American Tower’s ASTS Sale: The Most Concerning Signal

Comparing insider activity across these three names, the AST SpaceMobile transaction by American Tower is the clearest red flag. Rocket Lab’s sales are overwhelmingly preplanned, and TransDigm’s selling is concentrated in a single board member. In contrast, American Tower’s large, discretionary reduction in ASTS exposure carries far more informational weight.

Given American Tower’s stature and industry insight, investors should take note. Insider selling alone should not dictate an investment decision, but the scale and discretionary nature of this transaction suggest a materially more cautious outlook for AST SpaceMobile going forward.

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