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Claudine Adamo

COST
EXECUTIVE VICE PRESIDENT · COSTCO WHOLESALE CORP /NEW · CIK 0001916124
FILING MIX · LIFETIME14%/86%
BUYS
5
SELLS
31
TOTAL VALUE
$16.82M
COMPANIES
1
ACTIVE SINCE
Apr 2022
HOLDINGS NOW
6,121
AVG SELL PX
$738.77
TRADE KIND
SHOWING 36 / 36
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
8 backtested trades · 8 horizons · 7 pending
Forward-return performance of every backtestable P/S trade by Claudine Adamo, 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
7d8+62.50%-0.45%-1.10%+0.65%+0.79%—
14d8+62.50%-0.93%-1.99%+1.06%+0.00%—
30d8+37.50%+0.03%-0.48%+0.52%-0.62%—
60d8+37.50%+1.75%+3.14%-1.39%-1.64%—
90d8+37.50%+4.93%+3.87%+1.06%+2.08%—
180d8(1 pending)+14.29%+7.06%+5.28%+1.78%+2.66%—
1y8(2 pending)+16.67%+15.48%+14.01%+1.48%-4.24%—
2y8(4 pending)+0.00%+52.00%+43.00%+9.00%+6.81%—
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
COST · 6,121.195 shares · as of Mar 9, 2026
03,3586,71610,07413,4322023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
FLOW · 5 buys / 31 sellsCOVERAGE · 16 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
730$1,003.02$732.2K6,121.195Mar 9, 2026Mar 11, 2026 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
2,700$935.68$2.53M6,851.197Oct 24, 2025Oct 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
96.94$944.68$91.6K10,037.117Oct 22, 2025Oct 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
121.78$944.68$115.0K10,134.057Oct 22, 2025Oct 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
176.66$944.68$166.9K9,661.767Oct 22, 2025Oct 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
198.69$944.68$187.7K9,838.427Oct 22, 2025Oct 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
110.57$944.68$104.5K9,551.197Oct 22, 2025Oct 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
949.666$956.29$908.2K10,255.837Sep 10, 2025Sep 12, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
4,219——11,205.503Sep 10, 2025Sep 12, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
900$922.56$830.3K6,986.503Mar 24, 2025Mar 25, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
176.658$893.49$157.8K7,886.503Oct 22, 2024Oct 24, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
97.342$893.49$87.0K8,261.45Oct 22, 2024Oct 24, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
148.617$893.49$132.8K8,480.97Oct 22, 2024Oct 24, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
122.178$893.49$109.2K8,358.792Oct 22, 2024Oct 24, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
198.289$893.49$177.2K8,063.161Oct 22, 2024Oct 24, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
3,200$888.99$2.84M8,629.587Sep 30, 2024Oct 2, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
6,737.124——13,431.738Sep 16, 2024Sep 18, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
1,602.151$907.87$1.45M11,829.587Sep 16, 2024Sep 18, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
1,500$714.83$1.07M6,694.614Mar 11, 2024Mar 13, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
30.726——8,158.974Jan 12, 2024Jan 12, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
66.366——8,194.614Jan 12, 2024Feb 22, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
2,565$548.92$1.41M8,128.248Oct 23, 2023Oct 24, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
146.383$552.93$80.9K10,909.28Oct 22, 2023Oct 24, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
120.411$552.93$66.6K10,788.869Oct 22, 2023Oct 24, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
195.176$552.93$107.9K11,239.428Oct 22, 2023Oct 24, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
183.765$552.93$101.6K11,055.663Oct 22, 2023Oct 24, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
95.621$552.93$52.9K10,693.248Oct 22, 2023Oct 24, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
7,429——13,114Sep 15, 2023Sep 19, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
1,679.396$556.36$934.3K11,434.604Sep 15, 2023Sep 19, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
2,000$495.97$991.9K5,685Oct 26, 2022Oct 27, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
574$478.18$274.5K7,685Oct 22, 2022Oct 25, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
602$478.18$287.9K8,259Oct 22, 2022Oct 25, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
158$478.18$75.6K9,781Oct 22, 2022Oct 25, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
342$478.18$163.5K9,439Oct 22, 2022Oct 25, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
578$478.18$276.4K8,861Oct 22, 2022Oct 25, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
500$602.03$301.0K9,939Apr 8, 2022Apr 8, 2022 ↗View →
Other insiders · COST
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About this filer
CIK 0001916124
ROLE
Executive Vice President
PRIMARY
COST
COMPANIES
1
ACTIVE SINCE
Apr 2022
MARKETPEEL · /INSIDER/0001916124DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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