Boolean Monitor Rules: 12 Patterns That Actually Catch Market-Moving News

Why Most Monitor Rules Fail

New users set up a rule like AAPL OR Apple and get 200 headlines a day. 198 of those are noise (analyst target tweaks, investor wikis, "5 stocks to buy"). The 2 that matter (SEC inquiry, supply chain disruption) drown.

Good monitor rules start with what you're actually trying to catch, not what you're afraid to miss. Catalayer Monitor supports AND/OR/NOT across headline + source + stock symbol, so precision is free — you just have to write the rules.

Pattern 1: Earnings-Specific Breaking

(earnings OR guidance OR miss OR beat OR revenue) AND (AAPL OR MSFT OR GOOG OR AMZN OR NVDA OR TSLA)

Captures earnings surprises at the moment of release. Filter further with AND NOT (target OR analyst OR price_target) to skip analyst reactions.

Pattern 2: FDA Approvals / Rejections

(FDA AND (approval OR approved OR rejected OR denied OR recall)) AND NOT (warning OR prior)

Biotech catalysts. Time-sensitive because shares can move 30-50% in minutes. This rule typically fires 5-10 times per week across the biotech universe.

Pattern 3: M&A Intelligence

(acquisition OR merger OR buyout OR "tender offer" OR "takeover bid") AND NOT (rumor OR denied OR collapsed)

Captures confirmed M&A events. Filter NOT terms are critical — half the M&A mentions are speculation or denials, which aren't actionable.

Pattern 4: Regulatory Actions

(SEC OR FTC OR DOJ) AND (investigation OR subpoena OR lawsuit OR settlement OR fine)

Regulatory news moves shares immediately. This rule works across sectors. On our live feed, this pattern fires 3-8 times per day.

Pattern 5: Crypto Exchange Failures

(Binance OR Coinbase OR Kraken OR OKX) AND (halt OR suspend OR hack OR breach OR outage)

Crypto-specific. Exchange issues cascade through the broader crypto market within 30 minutes.

Pattern 6: Fed / Central Bank

("Federal Reserve" OR FOMC OR "rate decision" OR Powell) AND NOT (speech)

Filter NOT (speech) excludes the constant stream of Fed officials' public comments. You want actions, not talk.

Pattern 7: Supply Chain Disruption

(chip OR semiconductor OR battery OR lithium) AND (shortage OR delay OR fire OR disruption OR halt)

Components drive earnings 1-2 quarters later. Early signal. Our users who track this catch moves 48-72 hours before analyst notes hit.

Pattern 8: Geopolitical Triggers

(Taiwan OR Iran OR "South China Sea" OR sanction) AND (military OR strike OR blockade OR deploy)

Macro news affecting defense stocks, oil futures, and tech indexes. Fires rarely but moves matter.

Pattern 9: Specific Ticker + Event Combo

TSLA AND (recall OR delivery OR Model OR Musk) AND NOT (tweet)

Single ticker with material-event filter. Excludes social media noise.

Pattern 10: Your Portfolio Only

AAPL OR MSFT OR GOOG OR NVDA OR META OR TSLA OR AMZN

Broadest version. Use for positions you hold and want never-miss coverage on. Expect 30-50 headlines per day.

Pattern 11: Earnings Calendar Pre-announcement

(preannounce OR "pre-announcement" OR guidance OR warning) AND NOT (analyst)

Companies issuing early guidance (usually bad news). Catches warnings 1-2 weeks before formal earnings.

Pattern 12: Crisis Keywords

(bankruptcy OR "Chapter 11" OR default OR insolvency OR "going concern")

Corporate distress indicators. Useful for shorts and for avoiding holdings heading into crisis.

Rule Combinations That Fail

Patterns to avoid:

• AAPL alone — 200 hits/day, useless
• stock OR market — every article mentions these
• Single keyword without NOT filters — you'll drown in analyst pieces

How Catalayer Processes These

Behind the scenes, your rule hits our news_archive table which ingests from 50+ sources in real-time. Rules run as boolean filters at query time, so updates to rules take effect within seconds.

Source priority affects alert speed:

• Tier 1 (< 60s from publication): Investing.com, Seeking Alpha, Barchart, MarketWatch, Reuters, CNBC
• Tier 2 (60-180s): Motley Fool, Yahoo Finance, Insider Monkey, MarketBeat
• Tier 3 (180s-10min): Barron's, WSJ, IBD (paywall-delayed feeds)

For latency-sensitive rules, constrain source scope: source:(Investing.com OR Seeking Alpha OR Reuters) AND ...

Measuring Rule Quality

Good rules have:

• Signal rate: ≥ 1 in 5 alerts is actionable
• Alert volume: 3-15 alerts/day per rule (not 100)
• Latency: alerts arrive within 2 minutes of source publication

If a rule violates any of these, tune with more NOT filters or narrow keyword scope.

Setup in Catalayer

1. Navigate to [/monitor](/monitor) → Create Monitor
2. Paste the boolean rule
3. Select source tier (Tier 1 only for speed-critical rules)
4. Choose delivery (in-app, Island desktop push, or Telegram)
5. Save

Rules start firing on newly-ingested news within seconds. Back-fill against last 24h available in the UI.

FAQ

A: Yes. Use TSLA AND (delivery OR Model) for ticker + event, or just TSLA for all TSLA-mentioning stories. Symbol matching works against the stock_codes field in each ingested story.

A: For Tier 1 sources (Investing.com, Seeking Alpha, Reuters), alerts fire within 60 seconds of publication on our ingestion side. Browser-side delivery adds 1-3 seconds.

A: Not directly in the rule syntax, but you can combine with scheduled quiet hours on Island delivery so you're only paged during market hours.