hedge fund activist target drift
What it checks
When a hedge-fund activist (Elliott, Pershing, Starboard, etc.) discloses a brand-new stake in a company for the first time, the stock typically drifts upward for 2-3 months as the market prices in expected operational or governance changes.
Mechanism
Narrower than the existing activist_13d_drift family (#163): filters investor_filings to hedge-fund-style activists (Elliott, Pershing Square, Starboard, etc.) and only emits a signal when the filing is genuinely new for that investor on this ticker (no prior filing in 365 days). BJPT 2008 document the ~7% drift over 60-90 days post-disclosure.
Signal rule
Investor filing with investor_type containing 'hedge' OR name matching curated 21-firm activist pattern list, on the ticker, with no prior filing for the same investor in trailing 365 days -> LONG at T+1 after a 2-day publish buffer; hold 60/90 trading days.
Data dependencies
daily_pricesAdjusted-close OHLCV for every US-listed ticker; primary price feed.
investor_holdingsWorker data table — see services/worker schema.
investor_filingsWorker data table — see services/worker schema.
tracked_investorsWorker data table — see services/worker schema.
Expected edge
- Paper alpha
- ~7% over 60-90d (BJPT 2008)
- Paper window
- T+1 to T+90d
~7% over 60-90d on first-time activist disclosures (BJPT 2008).
Example tickers where this is likely to fire
Illustrative only — the signal fires based on the live data, not a fixed list.
Related families
multiple activist pile on longEvent-DrivenWhen two or more distinct activists file 13D on the same target within ~60 days, drift is materially larger than single-activist 13D. Coordinated pressure increases the probability of management capitulation. Reported abnormal returns ~12-15% over 12mo vs ~7% for single-activist events.
activist pair revertEvent-DrivenActivist 13D targets outperform their industry peer (sector-ETF proxy) by ~7-10% over the first 12 months post-filing; a portion of the spread reverts in months 13-24 as the activist exits and gains are priced in. Pair-trade overlay: target LONG during drift, target SHORT during revert, gated on prior sector-relative underperformance.
Explore hedge fund activist target drift on alphactor.ai
See which tickers this family is currently firing on, with live signals and rankings.