Form 144 Filer Cluster
In plain terms
When 3 or more insiders file Form 144 (intent-to-sell notices) within a single month, the cited papers predicted the stock underperforms for 2-6 months. Our testing found the opposite on the current universe: these clusters happen at high-momentum names that keep rising, so the strategy buys on the cluster instead of shorting it.
How it works
Papers posit that when MULTIPLE distinct insiders file Form 144 (intent-to-sell notice) within a short window (3+ in 30 days), the clustering reflects coordinated information about over-valuation, predicting underperformance over 60-180 days. INTENTIONAL DEVIATION (template v4, 2026-06-08): on this universe the short thesis fails; pooled IS/OOS tests on two independent liquid baskets show the SHORT pool robustly negative (basket A IS -1.43 / OOS -2.68; basket B IS -1.90 / OOS -1.64), so the shipped implementation trades the INVERSE: clustered Rule 10b5-1 sell notices occur at high-momentum growth names after a run-up, and those names continue (momentum continuation), so the code goes LONG T+1 on the cluster. Paper citation is retained for the signal construction (distinct-filer count), not the sign.
Data dependencies
- Daily prices
Adjusted-close OHLCV for every US-listed ticker; primary price feed.
- SEC form 144 filings
SEC Form 144 planned-sale notices, parsed from EDGAR structured filings.
Expected edge
- Reported return
- -3-5% over 90d (papers' SHORT direction; shipped implementation intentionally trades the inverse LONG)
- Tested over
- T+1 to T+180d
Papers' original claim: -3-5% over 90d SHORT on >=3 distinct filers within 30d (2003-2012 sample). Shipped (flipped LONG): pooled IS +1.43..+1.90 / OOS +1.64..+2.68 Sharpe across two independent baskets; mean forward-60d after fire +10.9% vs +8.1% same-names all-days baseline.
Related families
When insiders file large planned-sale notices, we short the issuer for the next few weeks.
When 2+ insiders file paperwork to sell within 14 days of each other, the coordinated planned-exit signal tends to mark short-term tops.
When multiple insiders sell after the stock has rallied 20% or more from its 3-month low, that cluster of opportunistic sales tends to mark a near-term top. Short for 2-6 months. Routine sales unconditioned on price moves are noise.
Explore Form 144 Filer Cluster on alphactor.ai
See which tickers this family is currently firing on, with live signals and rankings.