Disclosure#354tier 2experimental liveNew

`item 8 01 other events z`

cadence: Weeklydata: lowshort only

2013

Cohen, L., Lou, D. & Malloy, C. (2013). "Playing Favorites: How Firms Prevent the Revelation of Bad News." Review of Financial Studies + Bushee, B., Matsumoto, D. & Miller, G. (2003). "Open Versus Closed Conference Calls." Review of Accounting Studies.

Read the paper →

What it checks

When a company suddenly files many more 'Other Events' 8-Ks than usual, it often means they're staging bad news through catch-all disclosures — short for 1-3 months.

Mechanism

8-K Item 8.01 'Other Events' is the catch-all for material disclosures that don't fit a numbered item — Reg-FD press releases, partnership announcements, etc. A surge vs ticker baseline signals information-environment shock and (per Cohen-Lou-Malloy) negative drift when the shock is at the right tail.

No production champion data for this family yet. Stats appear once the discovery pipeline promotes at least one strategy with this family tag, or once a multi-family blend that includes it earns a champion slot.

Signal rule

90d-rolling Item 8.01 count z >= 1.5 vs trailing 2y own baseline -> SHORT T+1, hold 30/60/90d.

Data dependencies

daily_prices
Adjusted-close OHLCV for every US-listed ticker; primary price feed.
sec_8k_events
Item-coded 8-K events (1.01 material agreements, 4.02 non-reliance, etc.).

Expected edge

Paper alpha: -2 to -5% over 60d
Paper window: T+1 to T+90d

Cohen-Lou-Malloy 2013; ~-2 to -5% over 60d on velocity tail.

Related families

sec 8k disclosure velocityDisclosure

Acceleration in 8-K filing frequency (per-90d count z-score vs trailing-2y own history) is an information-environment shock. Firms accelerate disclosures around adverse events (restatements, departures, litigation, Reg FD violations); tail-z velocity predicts both elevated realized vol and a negative drift over 1-2 quarters.

item 4 02 restatement shortDisclosure

8-K Item 4.02 (Non-Reliance on Previously Issued Financial Statements) is by SEC rule one of the strongest negative-information disclosures — management has concluded prior financials cannot be relied upon. Documented -8% event-day return and -12% drift over 6 months.

item 5 03 governance change shortGovernance

8-K Item 5.03 (Amendments to Articles or Bylaws; Change in Fiscal Year) often coincides with entrenchment moves: anti-takeover provisions, board-size changes, supermajority-vote requirements. Structural governance changes (distinct from Item 5.02 officer departures) correlate with subsequent underperformance.

Explore `item 8 01 other events z` on alphactor.ai

See which tickers this family is currently firing on, with live signals and rankings.

Open universe with this filter →Browse all 338 families

item 8 01 other events z