AMPL insider buying and SEC filings, explained
Amplitude, Inc. · CIK 1866692
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$300K
Insiders who bought
1
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$15.3M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 26–28, 2026 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 6,951 shares indirectly (by spouse) between Oct 26 and Oct 28 at about $17.52 ($122K), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Oct 28, 2026, 5:45 PM ET |
| Oct 23, 2026 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 107,136 shares indirectly (by spouse) at about $17.52 ($1.9M), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Oct 27, 2026, 4:45 PM ET |
| Oct 2, 2026 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 70,087 shares indirectly (by spouse) at about $14.52 ($1.0M), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Oct 6, 2026, 4:17 PM ET |
| Sep 30–Oct 1, 2026 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 4,913 shares indirectly (by spouse) between Sep 30 and Oct 1 at about $14.45 ($71K), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Oct 2, 2026, 6:44 PM ET |
| Sep 10, 2026 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 185,000 shares indirectly (by spouse) at about $12.30 ($2.3M), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Sep 14, 2026 |
| Sep 4, 2026 | Planned (10b5-1) | Nathaniel Glenn Crook (Chief Commercial Officer) sold 300,000 shares at about $12.99 ($3.9M), marked as a 10b5-1 plan trade. Holdings down 16% to 1,622,696 shares. | SEC filing Filed Sep 9, 2026 |
| Jun 1, 2026 | Planned (10b5-1) Amended filing | Curtis Liu (Chief Technology Officer and Director) sold 22,786 shares at about $8.03 ($183K), marked as a 10b5-1 plan trade. Holdings down 2% to 1,004,194 shares. This amends a filing from Jun 3. | SEC filing Filed Jun 16, 2026 |
| Jun 12, 2026 | Planned (10b5-1) | Catherine Wong (Director) sold 7,453 shares at about $6.79 ($51K), marked as a 10b5-1 plan trade. Holdings down 6% to 111,462 shares. | SEC filing Filed Jun 15, 2026 |
| May 4, 2026 | Planned (10b5-1) | Curtis Liu (Chief Technology Officer and Director) sold 17,586 shares at about $8.12 ($143K), marked as a 10b5-1 plan trade. Holdings down 2% to 1,067,259 shares. | SEC filing Filed May 6, 2026 |
| Mar 6, 2026 | Planned (10b5-1) | Curtis Liu (Chief Technology Officer and Director) sold 33,201 shares at about $8.01 ($266K), marked as a 10b5-1 plan trade. Holdings down 5% to 603,756 shares. | SEC filing Filed Mar 10, 2026 |
| Mar 5, 2026 | Planned (10b5-1) | Curtis Liu (Chief Technology Officer and Director) sold 30,061 shares at about $8.00 ($240K), marked as a 10b5-1 plan trade. Holdings down 5% to 636,957 shares. | SEC filing Filed Mar 9, 2026 |
| Dec 26, 2025 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 100 shares indirectly (by spouse) at $12.00 ($1K), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Dec 30, 2025 |
| Dec 24, 2025 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 42,743 shares indirectly (by spouse) at about $12.01 ($513K), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Dec 29, 2025 |
| Dec 15, 2025 | Planned (10b5-1) | Erica Schultz (Director) sold 10,000 shares at about $10.88 ($109K), marked as a 10b5-1 plan trade. Holdings down 8% to 114,906 shares. | SEC filing Filed Dec 17, 2025 |
| Nov 17, 2025 | Planned (10b5-1) | Erica Schultz (Director) sold 10,000 shares at about $10.23 ($102K), marked as a 10b5-1 plan trade. Holdings down 9% to 107,406 shares. | SEC filing Filed Nov 19, 2025 |
| Nov 11, 2025 | Planned (10b5-1) | Spenser Skates (CEO and Director) sold 400,000 shares indirectly (by spouse) at about $10.99 ($4.4M), marked as a 10b5-1 plan trade. Holdings by spouse down 100% to 0 shares. | SEC filing Filed Nov 13, 2025 |
| Nov 7, 2025 | Purchase (code P) | Andrew Casey (CFO) bought 30,000 shares at about $9.99 ($300K), reported as a purchase (code P). Holdings up 3% to 1,160,608 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 12, 2025 |
42 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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