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Antero Midstream stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+14.9% to $18.98
Antero Midstream (AM) stock rose 15% over the last 252 sessions, to $18.98. On the way it reported 4 quarters, its insiders filed 6 open-market trades and 1 Form 144 notice of planned sales, and the company filed 3 material 8-Ks. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Oct 28, 2026 | Earnings | Earnings: missed the EPS estimate by -23.0% | −0.6% (−0.9% vs SPY) | +0.3% (+2.3% vs SPY) | — |
| Aug 6, 2026 | Form 144 | Form 144: Brooks J Klimley plans to sell $106K | +1.5% (+1.7% vs SPY) | +5.0% (+4.6% vs SPY) | +6.0% (+5.5% vs SPY) |
| Aug 6, 2026 | Insider sale | Klimley Brooks J sold $106K | +1.5% (+1.7% vs SPY) | +5.0% (+4.6% vs SPY) | +6.0% (+5.5% vs SPY) |
| Aug 4, 2026 | Insider sale | Pearce Sheri sold $352K | −0.6% (−2.4% vs SPY) | −0.2% (−2.2% vs SPY) | +2.3% (+1.7% vs SPY) |
| Jul 29, 2026 | Earnings | Earnings: missed the EPS estimate by -18.1% | 0.0% (+1.5% vs SPY) | +1.5% (−2.5% vs SPY) | +4.8% (+1.5% vs SPY) |
| May 4, 2026 | Insider sale | Schultz Yvette K sold $1.5M | +1.3% (+1.7% vs SPY) | −3.7% (−6.0% vs SPY) | −2.3% (−7.5% vs SPY) |
| Apr 29, 2026 | Earnings | Earnings: missed the EPS estimate by -3.6% | +1.1% (+1.1% vs SPY) | +0.7% (−1.0% vs SPY) | −2.2% (−8.1% vs SPY) |
| Mar 12, 2026 | Insider sale | Klimley Brooks J sold $116K | −1.2% (+0.4% vs SPY) | −1.7% (+0.6% vs SPY) | −4.8% (−5.6% vs SPY) |
| Mar 10, 2026 | Insider sale | Pearce Sheri sold $319K | −0.7% (−0.6% vs SPY) | +0.6% (+1.9% vs SPY) | −1.2% (−1.2% vs SPY) |
| Mar 9, 2026 | Insider sale | Schultz Yvette K sold $570K | −1.0% (−1.8% vs SPY) | +0.7% (+2.3% vs SPY) | −0.7% (+1.0% vs SPY) |
| Feb 11, 2026 | Earnings | Earnings: beat the EPS estimate by 2.2% | +2.7% (+2.7% vs SPY) | +5.2% (+6.1% vs SPY) | +13.8% (+17.7% vs SPY) |
| Feb 3, 2026 | 8-K | Completed acquisition or disposition | +0.6% (+1.1% vs SPY) | +6.5% (+6.2% vs SPY) | +20.4% (+21.6% vs SPY) |
| Dec 23, 2025 | 8-K | New debt or off-balance-sheet obligation | −1.0% (−1.3% vs SPY) | −1.5% (−0.6% vs SPY) | +3.4% (+2.7% vs SPY) |
| Dec 8, 2025 | 8-K | Material definitive agreement | +1.1% (+1.4% vs SPY) | −2.7% (−2.2% vs SPY) | −7.2% (−8.0% vs SPY) |
Insiders’ record here
In the year on the chart, Antero Midstream's insiders reported 0 open-market buys ($0) and 6 sales ($3.0M). Of the 6 old enough to score, 6 were followed by the stock doing what the trade implied over the next 63 sessions (beating SPY after a buy, lagging it after a sale); the median excess return after a buy was — and after a sale −8.1%.
Across the whole universe (19,782 scored trades), insider buys beat the market 46% of the time and sales were followed by a lagging stock 61% of the time; buys of $1M or more 39%. Every pattern →
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 1.01 Material definitive agreement | 23,525 | 0.0% | 51% | +1.0% | ±1.4% |
| 2.03 New debt or off-balance-sheet obligation | 13,268 | 0.0% | 50% | +1.2% | ±1.3% |
| 2.01 Completed acquisition or disposition | 2,671 | +0.1% | 52% | +1.2% | ±1.6% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
Report card: every quarter against the estimate → Antero Midstream: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.