- CMCSA has moved in the same direction as STM's earnings reaction in 67% of 9 tracked reports, with a median same-day move of ±1.3% — ×1.4 its normal daily move.
- EarningsWatcher tracks 1 quality-gated sympathy peers for STM: CMCSA.
- When STM's earnings reaction is positive, CMCSA's median same-day move is +0.8%; when negative, -0.1%.
All measured sympathy peers for STM
Every peer below passed the gates — enough events, direction consistency well above a coin flip, and a move meaningfully bigger than its normal day. Nobody else publishes this measurement; it exists because EarningsWatcher computes it from every STM report, with the peer's own earnings days and heavy market days excluded.
| Peer | Same direction | Typical move | vs normal day | Sympathy score |
|---|---|---|---|---|
| CMCSA | 67% of 9 | ±1.3% | ×1.4 | ▮▮ |
- the 0–100 sympathy score for each pair (direction consistency + amplification + correlation, discounted for small samples)
- each peer's live ATM straddle with an honest 1-day breakeven — the move it must beat by the reaction-day close
- historical beat rates from real option prices: how often past STM reports beat that same hurdle
- direction splits, gap-vs-peak timing, and an event-by-event history for every pair
- the week's best pairs delivered as P0/P1/P2 sympathy picks
Why trade the peer instead of STM itself?
Options on STM are expensive into the print — the expected move is priced in, and implied volatility collapses the moment results land. CMCSA has no event that day: its options are priced for a normal session, and measured across our pairs the median change in peer IV through a reporter's print is roughly zero. The sympathy trade turns STM's report into a position with a normal-day hurdle instead of an event-premium hurdle. New to the concept? Read what a sympathy play is, then see this week's live board.
Frequently asked questions
Which stocks move when STM reports earnings?
Measured over up to ten years of STM's earnings days, the strongest sympathy peer is CMCSA: same direction as STM's reaction in 67% of 9 tracked reports, median same-day move ±1.3%.
Are stocks like STM worth watching on its earnings day?
That is exactly what a sympathy play is: STM's report reprices companies with the same customers and economics, so 'stocks like STM' often move the same day — without an earnings event of their own. The size is usually smaller than STM's own move (CMCSA: ±1.3% vs a normal day ×1.4), but the peer's options carry no event premium, so there is no IV crush to pay.
Is CMCSA correlated with STM?
On STM's earnings days specifically, yes, historically: 67% same-direction over 9 events after excluding CMCSA's own earnings window and heavy market days. General day-to-day correlation is a different (weaker) question — the earnings-day link is the tradeable one.
What is a sympathy stock?
A sympathy stock moves on another company's news rather than its own — here, CMCSA reacting to STM's earnings. EarningsWatcher measures these relationships event by event and gates them for sample size, direction consistency and amplification; see the full guide to sympathy plays.