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Spenser Skates

AMPL
CHIEF EXECUTIVE OFFICER · AMPLITUDE, INC. · CIK 0001882913
FILING MIX · LIFETIME36%/64%
BUYS
12
SELLS
21
TOTAL VALUE
$44.72M
COMPANIES
1
ACTIVE SINCE
Aug 2021
HOLDINGS NOW
1,283,557
AVG SELL PX
$32.28
TRADE KIND
SHOWING 33 / 33
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
6 backtested trades · 8 horizons · 6 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Spenser Skates, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d6+100.00%-6.88%-0.84%-6.03%-5.93%
14d6+83.33%-5.75%+0.32%-6.06%-8.08%
30d6+33.33%+14.07%+3.06%+11.01%+13.88%
60d6+50.00%-5.07%+2.76%-7.84%+5.11%
90d6+50.00%-18.32%+3.43%-21.75%-23.25%
180d6+100.00%-55.75%+6.77%-62.52%-62.68%
1y6(3 pending)+100.00%-70.80%-14.35%-56.45%-57.11%
2y6(3 pending)+100.00%-78.92%+1.74%-80.67%-80.86%
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
AMPL · 1,283,557 shares · as of May 15, 2026
02,022,7054,045,4106,068,1158,090,82020222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 12 buys / 21 sellsCOVERAGE · 20 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
AMPL
AMPLITUDE, INC.
SALE
CEO and President
39,562$6.06$239.7K1,283,557May 15, 2026May 19, 2026View →
AMPL
AMPLITUDE, INC.
PURCHASEGRANT
Stock grant
1,323,1191,323,119Apr 21, 2026Apr 22, 2026View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
100100Dec 26, 2025Dec 30, 2025View →
AMPL
AMPLITUDE, INC.
SALE10b5-1
10b5-1 plan
100$12.00$1.2K0Dec 26, 2025Dec 30, 2025View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
100567,157Dec 26, 2025Dec 30, 2025View →
AMPL
AMPLITUDE, INC.
SALE10b5-1
10b5-1 plan
42,743$12.01$513.4K0Dec 24, 2025Dec 29, 2025View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
42,74342,743Dec 24, 2025Dec 29, 2025View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
42,743567,257Dec 24, 2025Dec 29, 2025View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
400,000610,000Nov 11, 2025Nov 13, 2025View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
400,000400,000Nov 11, 2025Nov 13, 2025View →
AMPL
AMPLITUDE, INC.
SALE10b5-1
10b5-1 plan
400,000$10.99$4.40M0Nov 11, 2025Nov 13, 2025View →
AMPL
AMPLITUDE, INC.
PURCHASEGRANT
Gift
1,010,0001,010,000Aug 4, 2025Aug 6, 2025View →
AMPL
AMPLITUDE, INC.
SALEGRANT
Gift
1,010,0005,342,146Aug 4, 2025Aug 6, 2025View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
70,0000Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
30,00070,000Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
30,0006,282,146Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
70,0006,352,146Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
70,0001,101,030Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
70,000$4.19$293.3K100,000Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
30,00089,330Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
30,000$4.19$125.7K30,000Feb 18, 2022Feb 23, 2022View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
189,0006,252,146Dec 13, 2021Dec 15, 2021View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
189,000189,000Dec 13, 2021Dec 15, 2021View →
AMPL
AMPLITUDE, INC.
SALEGRANT
Gift
189,0000Dec 13, 2021Dec 15, 2021View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
25,000$54.23$1.36M0Oct 1, 2021Oct 5, 2021View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
550,000$50.00$27.50M50,000Sep 28, 2021Sep 30, 2021View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
25,000$52.00$1.30M25,000Sep 28, 2021Sep 30, 2021View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
600,0006,441,146Sep 21, 2021Sep 23, 2021View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
600,000600,000Sep 21, 2021Sep 23, 2021View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
290,322$31.00$9.00M7,041,146Sep 10, 2021Sep 23, 2021View →
AMPL
AMPLITUDE, INC.
SALEGRANT
Gift
759,3527,331,468Sep 10, 2021Sep 23, 2021View →
AMPL
AMPLITUDE, INC.
PURCHASE
Chief Executive Officer
310,0008,090,820Aug 30, 2021Sep 23, 2021View →
AMPL
AMPLITUDE, INC.
SALE
Chief Executive Officer
310,000681,700Aug 30, 2021Sep 23, 2021View →
Other insiders · AMPL
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About this filer
CIK 0001882913
ROLE
Chief Executive Officer
PRIMARY
AMPL
COMPANIES
1
ACTIVE SINCE
Aug 2021
MARKETPEEL · /INSIDER/0001882913DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

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