AMPL · Insider trading · 13F holders · Congress trades
Amplitude, Inc. (AMPL)
Who is buying and selling AMPL: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 13
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $9.3M
- Congress trades, 12 months
- 0
AMPL at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 2 AMPL insiders filed 6 sales worth $9.3M on SEC Form 4, and no open-market purchases; 6 of the sales were pre-planned under Rule 10b5-1.
- 13 13F filers hold AMPL among their 50 largest positions, worth $85.8M combined. The biggest bets by portfolio weight are Toronado Partners, LLC (7.9%), Circumference Group LLC (4.0%) and Trigran Investments, Inc. (3.3%). In their latest 13Fs, 0 managers opened a new position and 4 added to one.
- No member of Congress has disclosed a trade in AMPL.
- AMPL last closed at $17.10 on Oct 29, 2026.
AMPL insider trading
Between Aug 1, 2026 and Oct 29, 2026, 2 AMPL insiders filed 6 sales worth $9.3M on SEC Form 4, and no open-market purchases; 6 of the sales were pre-planned under Rule 10b5-1.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 28, 2026 | Skates Spenser | CEO and President, Director, 10% Owner | Sale10b5-1 | 6,951 | $17.52 | $122K | SEC |
| Oct 27, 2026 | Skates Spenser | CEO and President, Director, 10% Owner | Sale10b5-1 | 107,136 | $17.52 | $1.9M | SEC |
| Oct 6, 2026 | Skates Spenser | CEO and President, Director, 10% Owner | Sale10b5-1 | 70,087 | $14.52 | $1.0M | SEC |
| Oct 2, 2026 | Skates Spenser | CEO and President, Director, 10% Owner | Sale10b5-1 | 4,913 | $14.45 | $71K | SEC |
| Sep 14, 2026 | Skates Spenser | CEO and President, Director, 10% Owner | Sale10b5-1 | 185,000 | $12.30 | $2.3M | SEC |
| Sep 9, 2026 | Crook Nathaniel Glenn | Chief Commercial Officer | Sale10b5-1 | 300,000 | $12.99 | $3.9M | SEC |
Who owns AMPL? Hedge funds and superinvestors
13 13F filers hold AMPL among their 50 largest positions, worth $85.8M combined. The biggest bets by portfolio weight are Toronado Partners, LLC (7.9%), Circumference Group LLC (4.0%) and Trigran Investments, Inc. (3.3%). In their latest 13Fs, 0 managers opened a new position and 4 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Sc US (ttgp), Ltd.Investment manager | 0.1% | $21.4M | 2,798,951 | +0.0% shares | Q2 2026 |
| Trigran Investments, Inc.Hedge fund | 3.3% | $17.8M | 2,321,209 | +510.0% shares | Q2 2026 |
| Optimus Prime Fund Management Co., Ltd.Asset manager | 0.9% | $12.1M | 1,580,100 | +0.0% shares | Q2 2026 |
| Gagnon Securities LLCWealth manager | 1.6% | $8.1M | 1,055,508 | -0.4% shares | Q2 2026 |
| Meros Investment Management, LPInstitutional asset manager | 2.0% | $6.3M | 827,977 | -28.9% shares | Q2 2026 |
| Monimus Capital Management, LPHedge fund | 1.5% | $6.0M | 783,808 | -38.0% shares | Q2 2026 |
| Gagnon Advisors, LLCHedge fund | 3.1% | $4.9M | 634,987 | +0.0% shares | Q2 2026 |
| Toronado Partners, LLCHedge fund | 7.9% | $2.8M | 366,751 | +15.0% shares | Q2 2026 |
| S Squared Technology, LLCHedge fund | 0.7% | $2.4M | 315,402 | +109.7% shares | Q2 2026 |
| Circumference Group LLCHedge fund | 4.0% | $1.8M | 238,000 | +0.0% shares | Q2 2026 |
| Westerly Capital Management, LLCHedge fund | 0.3% | $1.5M | 200,000 | -60.0% shares | Q2 2026 |
| Ahara Advisors LLCWealth manager | 0.3% | $545K | 39,347 | +7028.1% shares | Q3 2026 |
| Silver Lake Group, L.L.C.Investment manager | 0.0% | $119K | 15,616 | +0.0% shares | Q2 2026 |
Each manager counts with its latest 13F (Q3 2026: 1, Q2 2026: 12). Screen AMPL in the grand portfolio →
AMPL stock trades by members of Congress
No member of Congress has disclosed a trade in AMPL.
Analysis mentioning AMPL
Posts from the blog that cover Amplitude, Inc., newest first.
AMPL questions and answers
Are insiders buying AMPL stock?
Between Aug 1, 2026 and Oct 29, 2026, 2 AMPL insiders filed 6 sales worth $9.3M on SEC Form 4, and no open-market purchases; 6 of the sales were pre-planned under Rule 10b5-1.
Which hedge funds own AMPL?
13 13F filers hold AMPL among their 50 largest positions, worth $85.8M combined. The biggest bets by portfolio weight are Toronado Partners, LLC (7.9%), Circumference Group LLC (4.0%) and Trigran Investments, Inc. (3.3%). In their latest 13Fs, 0 managers opened a new position and 4 added to one.
Has Congress traded AMPL?
No member of Congress has disclosed a trade in AMPL.
Who is the largest holder of AMPL?
Among 13F filers, Sc US (ttgp), Ltd. reports the largest AMPL position, $21.4M (2,798,951 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Toronado Partners, LLC's: 7.9% of its portfolio.
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