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Material Event Filings Search (US Market)

Screening for Non-Operating Investment Losses via Material Event Filings

When markets experience sharp declines, some companies — especially those with large portfolios of marketable securities — face significant non-operating losses. Earnings reports may look fine on the surface, but hidden investment losses can wipe out operating profits.

In the US, companies disclose material events on SEC Form 8-K, and many markets have equivalent announcement systems. These filings often reveal losses from disposing of securities before the quarterly earnings report is published, giving informed investors an early warning signal.

US Market: SEC 8-K Full-Text Search

FinLab does not carry 8-K filings. For US stocks, use SEC EDGAR full-text search for 8-K filings with keywords like "disposition of assets" or "impairment loss", then compare the flagged companies with their quarterly results in FinLab (us_income_statement:*).

Taiwan Market: Announcement Data in FinLab

FinLab's announcement dataset important_info_announcement covers the Taiwan market only. Its title and info columns are the original Chinese announcement text, so keyword searches must use the Chinese terms for "disposal of securities" and "disposal loss". Pandas string matching does the screening:

from finlab import data


def search_announcements(info, title_keyword, content_keyword, since='2022-04'):
    """Announcements after `since` whose title and content contain the keywords."""
    return info[
        (info.index > since)
        & info['title'].str.contains(title_keyword)
        & info['info'].str.contains(content_keyword)
    ]


info = data.get('important_info_announcement')  # Taiwan market only

Call search_announcements(info, ...) with the Chinese keywords. The analytical approach — screening for non-operating losses before earnings — is the same in every market.

Why This Matters

Companies with weak core business fundamentals that dabble in short-term securities trading can suffer outsized losses during market downturns. Key red flags include:

  • Securities investments as a high percentage of equity — amplifies portfolio losses relative to company size
  • Frequent disposal announcements — signals active and potentially risky trading behavior
  • Tourism, hospitality, and other cyclically weak sectors — companies in struggling industries may chase investment returns to compensate for poor operating performance

Turning This into an Event-Driven Strategy

Market participants often overlook material event filings for small- and mid-cap stocks. The information asymmetry creates opportunities:

  • Avoiding blow-ups: Screen out companies with recent disposal losses before earnings season
  • Catching hidden gains: Some filings reveal gains from asset disposals that haven't yet been reflected in the stock price

This approach can be systematized into an event-driven strategy — monitor material event filings, flag companies with significant non-operating gains or losses, and position accordingly before the quarterly earnings report confirms what the filing already revealed.