SEC Form 4
Amplitude, Inc. (AMPL) insider trading
In the 12 months to Oct 23, 2026, 4 AMPL insiders reported open-market sales of $13.2M across 13 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $13.2M
- 13 filings · 4 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 13 of 13
- All $13.2M sold was pre-arranged
Who traded AMPL, and when
- Sale
- Sale, pre-arranged (10b5-1)
AMPL daily close from Oct 23, 2025 to Oct 23, 2026, between $5.61 and $17.42, last $17.42. 13 sale and 0 purchase filings by 4 insiders, marked at their filing dates. Spenser Skates, Chief Executive Officer → CEO and President: sold $8.3M across 6 filings, first filed Nov 13, 2025, last Oct 6, 2026. Nathaniel Glenn Crook, Chief Commercial Officer: sold $3.9M across 1 filing, first filed Sep 9, 2026, last Sep 9, 2026. Curtis Liu, Chief Technology Officer: sold $832.1K across 4 filings, first filed Mar 9, 2026, last Jun 16, 2026. Erica Schultz, Director: sold $211.1K across 2 filings, first filed Nov 19, 2025, last Dec 17, 2025.
Largest mark · tap a row for others
Spenser Skates · Chief Executive Officer
Sale $4,395,320
400,000 shares at $10.99 avg
Filed Nov 13, 2025 · traded Nov 11
Pre-arranged (10b5-1) · close on filing date $10.83
Spenser Skates · Chief Executive Officer → CEO and President
Chief Executive Officer → CEO and President
$8.3M soldNathaniel Glenn Crook · Chief Commercial Officer
Chief Commercial Officer
$3.9M soldCurtis Liu · Chief Technology Officer
Chief Technology Officer
$832.1K soldErica Schultz · Director
Director
$211.1K soldHas Amplitude, Inc.'s CEO sold stock?
Yes. Spenser Skates (CEO) sold 702,843 shares ($8.3M) between Nov 2025 and Oct 2026, all under a pre-arranged 10b5-1 plan.
Open-market trades
13 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Spenser Skates | Chief Executive Officer → CEO and President | $8.3M | — | 6 | 100% of sales | |
| Nathaniel Glenn Crook | Chief Commercial Officer | $3.9M | — | 1 | 100% of sales | |
| Curtis Liu | Chief Technology Officer | $832.1K | — | 4 | 100% of sales | |
| Erica Schultz | Director | $211.1K | — | 2 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Spenser Skates CEO and President | SalePre-arranged (10b5-1) | 70,087 | $14.52 | $1.0M | 0 | |
traded | Spenser Skates CEO and President | SalePre-arranged (10b5-1) | 4,913 | $14.45 | $71.0K | 0 | |
traded | Spenser Skates CEO and President | SalePre-arranged (10b5-1) | 185,000 | $12.30 | $2.3M | 0 | |
traded | Nathaniel Glenn Crook Chief Commercial Officer | SalePre-arranged (10b5-1) | 300,000 | $12.99 | $3.9M | 1,622,696 | |
traded | Curtis Liu Chief Technology Officer | SalePre-arranged (10b5-1) | 22,786 | $8.03 | $182.9K | 1,004,194 | |
traded | Curtis Liu Chief Technology Officer | SalePre-arranged (10b5-1) | 17,586 | $8.12 | $142.9K | 1,067,259 | |
traded | Curtis Liu Chief Technology Officer | SalePre-arranged (10b5-1) | 33,201 | $8.01 | $265.8K | 603,756 | |
traded | Curtis Liu Chief Technology Officer | SalePre-arranged (10b5-1) | 30,061 | $8.00 | $240.5K | 636,957 | |
traded | Spenser Skates Chief Executive Officer | SalePre-arranged (10b5-1) | 100 | $12.00 | $1.2K | 0 | |
traded | Spenser Skates Chief Executive Officer | SalePre-arranged (10b5-1) | 42,743 | $12.01 | $513.4K | 0 | |
traded | Erica Schultz Director | SalePre-arranged (10b5-1) | 10,000 | $10.88 | $108.8K | 114,906 | |
traded | Erica Schultz Director | SalePre-arranged (10b5-1) | 10,000 | $10.23 | $102.3K | 107,406 | |
traded | Spenser Skates Chief Executive Officer | SalePre-arranged (10b5-1) | 400,000 | $10.99 | $4.4M | 0 |
GET /stocks/filings/vX/form-4?tickers=AMPL&filing_date.gte=2025-10-23&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"AMPL"
],
"issuer_cik": "0001866692",
"owner_cik": "0001882913",
"accession_number": "0001610717-26-000427",
"form_type": "4",
"filing_date": "2026-10-06",
"period_of_report": "2026-10-02",
"issuer_name": "Amplitude, Inc.",
"issuer_trading_symbol": "AMPL",
"owner_name": "Skates Spenser",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": true,
"is_other": false,
"officer_title": "CEO and President",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-02",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 70087,
"transaction_price_per_share": 14.5203,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 0,
"transaction_value": 1017684.2661,
"direct_or_indirect": "I",
"nature_of_ownership": "By Spouse",
"footnotes": [
{
"id": "F2",
"description": "The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026."
},
{
"id": "F3",
"description": "This transaction was executed in multiple trades at prices ranging from $14.4500 to $14.6700. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."
}
]
},
{
"tickers": [
"AMPL"
],
"issuer_cik": "0001866692",
"owner_cik": "0001882913",
"accession_number": "0001610717-26-000424",
"form_type": "4",
"filing_date": "2026-10-02",
"period_of_report": "2026-09-30",
"issuer_name": "Amplitude, Inc.",
"issuer_trading_symbol": "AMPL",
"owner_name": "Skates Spenser",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": true,
"is_other": false,
"officer_title": "CEO and President",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-01",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 3539,
"transaction_price_per_share": 14.45,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 0,
"transaction_value": 51138.549999999996,
"direct_or_indirect": "I",
"nature_of_ownership": "By Spouse",
"footnotes": [
{
"id": "F2",
"description": "The sales reported were effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person's spouse on June 11, 2026."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 43 records
- Option exercises2 records
- Tax withholding14 records
- Tax withholding (sold to cover)1 record
- Grants and awards18 records
- Employee stock purchase plan1 record
- Other7 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for AMPL every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Role
- The title on each filing. Someone whose title changed shows more than one.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.