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Griffon stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+43.2% to $101.03
Griffon (GFF) stock rose 43% over the last 252 sessions, to $101.03. On the way it reported 4 quarters, its insiders filed 9 open-market trades and 7 Form 144 notices of planned sales, and the company filed 4 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 |
|---|---|---|---|---|---|
| Aug 19, 2026 | 8-K | Material definitive agreement | −2.7% (−1.9% vs SPY) | −2.0% (−1.7% vs SPY) | −9.7% (−9.0% vs SPY) |
| Aug 13, 2026 | Form 144 | Form 144: Kevin F. Sullivan plans to sell $367K | +1.0% (+0.3% vs SPY) | −1.9% (−1.5% vs SPY) | −8.6% (−7.5% vs SPY) |
| Aug 13, 2026 | Form 144 | Form 144: Cheryl L Turnbull plans to sell $320K | +1.0% (+0.3% vs SPY) | −1.9% (−1.5% vs SPY) | −8.6% (−7.5% vs SPY) |
| Aug 13, 2026 | Insider sale | Turnbull Cheryl L sold $318K | +1.0% (+0.3% vs SPY) | −1.9% (−1.5% vs SPY) | −8.6% (−7.5% vs SPY) |
| Aug 13, 2026 | Insider sale | Sullivan Kevin F sold $370K | +1.0% (+0.3% vs SPY) | −1.9% (−1.5% vs SPY) | −8.6% (−7.5% vs SPY) |
| Aug 11, 2026 | 8-K | Material definitive agreement | −1.8% (−2.0% vs SPY) | −5.3% (−4.9% vs SPY) | −11.1% (−9.5% vs SPY) |
| Aug 7, 2026 | Form 144 | Form 144: Brian G. Harris plans to sell $564K | +0.9% (+0.2% vs SPY) | −0.3% (−1.5% vs SPY) | −6.2% (−6.4% vs SPY) |
| Aug 5, 2026 | Earnings | Earnings: beat the EPS estimate by 12.6% | +9.4% (+9.6% vs SPY) | +13.2% (+13.3% vs SPY) | +2.6% (+3.4% vs SPY) |
| Aug 5, 2026 | Form 144 | Form 144: Ronald J. Kramer plans to sell $9.4M | +9.4% (+9.6% vs SPY) | +13.2% (+13.3% vs SPY) | +2.6% (+3.4% vs SPY) |
| Aug 5, 2026 | Form 144 | Form 144: Brian G. Harris plans to sell $1.1M | +9.4% (+9.6% vs SPY) | +13.2% (+13.3% vs SPY) | +2.6% (+3.4% vs SPY) |
| Aug 5, 2026 | Form 144 | Form 144: Robert Mehmel plans to sell $5.1M | +9.4% (+9.6% vs SPY) | +13.2% (+13.3% vs SPY) | +2.6% (+3.4% vs SPY) |
| Aug 4, 2026 | 8-K | Material definitive agreement | +4.6% (+2.8% vs SPY) | +15.9% (+13.9% vs SPY) | +5.7% (+5.1% vs SPY) |
| Jun 30, 2026 | Form 144 | Form 144: Brian G. Harris plans to sell $606K | +1.2% (+0.4% vs SPY) | −4.3% (−5.2% vs SPY) | −9.6% (−8.0% vs SPY) |
| Jun 12, 2026 | Insider sale | Kramer Ronald J sold $9.5M | −1.7% (−2.2% vs SPY) | −4.5% (−5.9% vs SPY) | −4.8% (−6.9% vs SPY) |
| Jun 11, 2026 | 8-K | Material definitive agreement | +4.9% (+3.2% vs SPY) | −2.2% (−4.3% vs SPY) | −0.9% (−4.4% vs SPY) |
| May 7, 2026 | Earnings | Earnings: beat the EPS estimate by 6.3% | −2.1% (−1.8% vs SPY) | −11.1% (−12.2% vs SPY) | −7.7% (−8.2% vs SPY) |
| Mar 5, 2026 | Insider buy | Alpert Henry A bought $80K | −2.4% (−1.9% vs SPY) | −9.8% (−8.5% vs SPY) | −13.6% (−9.4% vs SPY) |
| Feb 17, 2026 | Insider sale | Durborow W. Christopher sold $920K | −1.6% (−1.8% vs SPY) | −7.8% (−7.9% vs SPY) | −24.7% (−23.0% vs SPY) |
| Feb 13, 2026 | Insider sale | Grabowsky Louis J. sold $1.0M | +1.5% (+1.4% vs SPY) | −3.9% (−5.1% vs SPY) | −23.4% (−21.6% vs SPY) |
| Feb 12, 2026 | Insider sale | Taylor Michelle L sold $153K | −1.9% (−0.3% vs SPY) | −6.8% (−5.7% vs SPY) | −28.0% (−23.6% vs SPY) |
| Feb 9, 2026 | Insider sale | Sight James W sold $295K | 0.0% (−0.5% vs SPY) | −1.3% (0.0% vs SPY) | −22.8% (−20.9% vs SPY) |
| Feb 9, 2026 | Insider sale | Kaplan Seth L. sold $1.4M | 0.0% (−0.5% vs SPY) | −1.3% (0.0% vs SPY) | −22.8% (−20.9% vs SPY) |
| Feb 5, 2026 | Earnings | Earnings: beat the EPS estimate by 7.7% | +5.6% (+6.8% vs SPY) | +10.3% (+9.5% vs SPY) | −8.8% (−6.7% vs SPY) |
| Nov 19, 2025 | Earnings | Earnings: beat the EPS estimate by 1.7% | +3.5% (+3.1% vs SPY) | +12.0% (+9.8% vs SPY) | +14.9% (+12.5% vs SPY) |
Insiders’ record here
In the year on the chart, Griffon's insiders reported 1 open-market buy ($80K) and 8 sales ($14.0M). Of the 7 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 −3.5% and after a sale −15.6%.
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% |
| 2.01 Completed acquisition or disposition | 2,671 | +0.1% | 52% | +1.2% | ±1.6% |
| 2.03 New debt or off-balance-sheet obligation | 13,268 | 0.0% | 50% | +1.2% | ±1.3% |
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 → Griffon: 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.