Insider Trading ETFs and Funds: Investing Based on Insider Activity

For investors who believe in the informational value of insider trading signals but prefer a hands-off approach, a growing number of ETFs and funds have emerged that systematically track insider buying patterns. These products automate the process of monitoring SEC Form 4 filings, constructing portfolios based on predefined rules, and rebalancing as new insider transactions are reported. Understanding how these products work — and their limitations — is essential before committing capital.

ETFs That Track Insider Buying

Several ETFs have been launched over the years that specifically target companies experiencing significant insider purchasing activity. The most well-known include the Invesco Insider Sentiment ETF and various other products that have come and gone from the market. These funds typically screen the universe of SEC insider filings and select companies where insiders have made meaningful open market purchases.

The market for insider-focused ETFs has been somewhat volatile itself. Several products have launched with significant marketing fanfare only to close after a few years due to insufficient asset gathering. This pattern reflects a broader challenge in niche ETFs: the underlying strategy may be sound, but if the fund fails to attract enough assets, the fixed costs of running an ETF become unsustainable. Investors should verify that any insider-focused ETF they consider has sufficient assets under management (generally above $50 million) to avoid the risk of fund closure.

Beyond pure insider-following ETFs, some broader smart-beta and factor-based funds incorporate insider activity as one of several signals in their stock selection process. These multi-factor approaches may blend insider buying data with value metrics, quality scores, and momentum signals to construct a more diversified portfolio.

How Insider ETFs Construct Portfolios

The portfolio construction methodology varies across products, but most insider-focused ETFs follow a broadly similar process. First, they filter the universe of Form 4 filings to identify qualifying transactions — typically open market purchases by officers and directors, excluding option exercises, gifts, and other non-informative transactions.

Next, they apply scoring criteria to rank the qualifying transactions. Common factors include:

• Dollar value of the purchase — larger purchases receive higher weight as they represent greater insider conviction.
• Insider role — purchases by CEOs and CFOs are typically weighted more heavily than director or officer purchases.
• Number of insiders buying — cluster buying patterns receive a boost in most scoring systems.
• Recency — more recent transactions are weighted more heavily, with older signals gradually decaying.

The fund then constructs a portfolio of the top-ranked stocks, typically holding 30 to 100 positions. Rebalancing occurs on a regular schedule — usually monthly or quarterly — at which point new insider buying signals are incorporated and stale positions that no longer meet the criteria are sold. Some funds use equal weighting, while others weight positions by the strength of the insider signal or by market capitalization.

Performance Compared to Benchmarks

The track record of insider-focused ETFs has been mixed. During certain periods, these funds have outperformed broad market benchmarks like the S&P 500, validating the academic research on insider signal alpha. During other periods, they have underperformed, sometimes significantly.

Several structural factors explain why ETF performance often falls short of what backtests suggest. Rebalancing lag is a major issue: by the time a fund identifies an insider purchase, processes it through its scoring model, and executes the trade at the next rebalancing date, days or weeks may have passed since the original filing. The initial price reaction to the insider purchase may already be priced in.

Diversification requirements also dilute the signal. An ETF that must hold 50 or more positions for regulatory and risk management reasons will inevitably include many stocks with weaker insider signals alongside the highest-conviction opportunities. A concentrated portfolio of the 10-15 best insider signals would likely outperform a diversified 50-stock portfolio, but ETFs are constrained by their mandates and fiduciary obligations.

Market cap bias is another consideration. Many insider-focused ETFs skew toward small and mid-cap stocks because that is where insider buying signals are strongest. This means their performance relative to the S&P 500 will partly reflect the small-cap vs. large-cap cycle rather than the pure insider signal. In periods when large-cap growth stocks dominate — as they did for much of the late 2010s and early 2020s — a small-cap-heavy insider ETF will face a structural headwind.

Fee Considerations

Insider-focused ETFs typically charge higher expense ratios than passive index funds, reflecting the active data processing and portfolio construction involved. Expense ratios in the range of 0.50% to 0.75% annually are common, compared to 0.03% to 0.10% for broad market index ETFs.

This fee differential matters more than many investors realize. Over a 10-year holding period, a 0.60% annual expense ratio compounds to roughly 6% of your initial investment — capital that goes to the fund manager rather than remaining in your account. For the fee to be justified, the insider signal must generate enough alpha to cover not only the expense ratio but also the rebalancing costs, the bid-ask spreads on less liquid holdings, and the opportunity cost of not simply owning a low-cost index fund.

Some investors may also face tax inefficiency with insider-following ETFs. The regular rebalancing required by these strategies generates more taxable events than a buy-and-hold index fund approach. In a taxable account, this turnover-induced tax drag can further erode after-tax returns.

DIY vs. ETF Approach

The alternative to an insider-focused ETF is building your own portfolio by directly monitoring insider filings using tools like InsiderFlow's tracker and making your own trading decisions. The DIY approach offers several advantages.

Speed of execution is the most important. When a compelling insider purchase is filed, a DIY investor can act within hours. An ETF that rebalances monthly may not add the position for weeks. Given that much of the alpha from insider signals is concentrated in the first few days after disclosure, this timing advantage can be significant.

Concentration is another advantage. A DIY investor can maintain a focused portfolio of 10-20 high-conviction positions rather than diluting across 50 or more stocks. Academic research consistently shows that concentrated insider signals outperform diluted ones.

Customization allows you to combine insider signals with your own fundamental research, sector expertise, or screening criteria. You can also overlay technical analysis, avoid sectors you are uncomfortable with, or adjust position sizes based on your own conviction level.

The disadvantages of DIY are the time commitment and the behavioral discipline required. Following insider filings daily, researching companies, and managing a portfolio takes consistent effort. And without predefined rules, it is easy to fall prey to emotional decision-making — holding losers too long, taking profits too early, or over-concentrating in a single name.

Limitations of Passive Insider-Following Strategies

Whether implemented through an ETF or a DIY approach, all passive insider-following strategies share certain inherent limitations. The most fundamental is that not every insider purchase is informative. Some insiders buy to meet ownership requirements mandated by their board. Others buy as part of a regular investment program that has little to do with their view of the stock's prospects. A purely mechanical strategy that buys every insider purchase without qualitative filtering will inevitably include these non-informative transactions.

Market regime sensitivity is another limitation. Insider buying signals have historically been most valuable during and after market downturns, when insiders step in to buy their beaten-down shares. During extended bull markets, the volume of insider buying tends to decline as stock prices rise and insiders find fewer bargains. This means that an insider-following strategy may underperform during the exact periods when the broader market is easiest to beat with a simple index fund.

Finally, the growing awareness of insider signals may be eroding their value over time. As more investors, funds, and algorithms monitor insider filings and trade on them more quickly, the window of opportunity narrows. The first-mover advantage that once allowed patient investors to capture significant alpha from insider signals is being compressed by faster information dissemination and more competition. This does not mean insider signals have become worthless — the academic evidence still supports their value — but the alpha available to late movers is likely smaller than historical backtests suggest.