Reporting owner · CIK 0001882913
Skates Spenser
SEC Form 4 history across 1 companies, 13 transactions and 4 filings.
CEO, PRESCEO and PresidentAmplitude, Inc.
Open-market transaction mix0% buys0 buys · 4 sales
Available history · Aug 17, 2026 – Oct 02, 2026
Latest insider transactions
Form 4 filings from available history.| Company | Insider | Activity | Disclosed value | Filed (ET) |
|---|---|---|---|---|
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | S · sale10b5-1 detectedSEC filing ↗ | -$1.01MView disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedSEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | S · sale10b5-1 detectedSEC filing ↗ | -$51.1kView disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedSEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | S · sale10b5-1 detectedSEC filing ↗ | -$19.8kView disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedSEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedDerivative securitySEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | S · sale10b5-1 detectedSEC filing ↗ | -$2.27MView disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | C · unknown10b5-1 detectedSEC filing ↗ | $0View disclosure → | |
AMPLAmplitude, Inc. | Skates SpenserCEO · PRES | F · withholdingSEC filing ↗ | -$682kView disclosure → |
Latest Form 4 facts
Quick context from source filings
Latest open-market transaction
sale at Amplitude, Inc. on Oct 02, 2026 valued at $1,017,684.
Review SEC filingLatest buy
No open-market insider purchase is available.
Monthly open-market activity
Last 3 reported months · purchases and sales
View exact monthly values
| Month | Purchases | Sales | Buy value | Sale value | Net value |
|---|---|---|---|---|---|
| Aug 2026 | 0 | 0 | $0.00 | $0.00 | $0.00 |
| Sep 2026 | 0 | 2 | $0.00 | $2,295,469.42 | -$2,295,469.42 |
| Oct 2026 | 0 | 2 | $0.00 | $1,068,822.82 | -$1,068,822.82 |
Net value is disclosed purchases minus sales, not profit. A dash means the value is unavailable.
Ownership and transaction size
Ownership and ticket size
Average P/S size$841.1K
Median P/S size$534.4K
Direct1
Indirect12
Oct 02, 2026unknown
Filing-only signals
Deterministic matches in this insider's history
Associated companies
Companies in the disclosed reporting history
Open-market buy performance
90-day forward return on this insider's open-market purchases
No open-market purchases in available history
A 90-day purchase return requires an open-market buy. No eligible purchases are recorded in this history.
Disclosed ownership
How reported shareholdings evolved
Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.
8 observations · Sep 10, 2026 – Oct 2, 2026. Window ends at the latest available report, not today.
Selected observation · Oct 2, 20260 shares reported
Inspect transaction View exact observations and source transactions
| Transaction date | Shares held after | Filed | Source |
|---|---|---|---|
| Sep 10, 2026 | 185,000 | Sep 14, 2026 | View transaction |
| Sep 10, 2026 | 0 | Sep 14, 2026 | View transaction |
| Sep 30, 2026 | 1,374 | Oct 2, 2026 | View transaction |
| Sep 30, 2026 | 0 | Oct 2, 2026 | View transaction |
| Oct 1, 2026 | 3,539 | Oct 2, 2026 | View transaction |
| Oct 1, 2026 | 0 | Oct 2, 2026 | View transaction |
| Oct 2, 2026 | 70,087 | Oct 6, 2026 | View transaction |
| Oct 2, 2026 | 0 | Oct 6, 2026 | View transaction |
Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.
Skates Spenser Insider Activity FAQ
SEC Form 4 context
Who is Skates Spenser?
Skates Spenser is a reporting owner in SEC Form 4 filings with reporting owner CIK 0001882913.
Which companies has Skates Spenser reported transactions for?
Amplitude, Inc.
When was Skates Spenser's latest insider buy?
No open-market insider purchase is available for this period.
When was Skates Spenser's latest insider sale?
sale at Amplitude, Inc. on Oct 02, 2026 valued at $1,017,684.
Where can I see the original SEC filings?
Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.
Are performance metrics included?
The profile shows average and median 90-day stock returns after open-market purchases when price coverage is available. These are unadjusted stock returns, not realized trading gains. Win rates, benchmark-adjusted returns and conviction scores are not calculated.