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Insider Trading Intelligence
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RM

Russell D. Miller

COST
EXECUTIVE VICE PRESIDENT · COSTCO WHOLESALE CORP /NEW · CIK 0001729741
FILING MIX · LIFETIME36%/64%
BUYS
12
SELLS
21
TOTAL VALUE
$28.06M
COMPANIES
1
ACTIVE SINCE
Sep 2020
HOLDINGS NOW
8,240
AVG SELL PX
$610.24
TRADE KIND
SHOWING 33 / 33
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
9 backtested trades · 8 horizons · 6 pending
Forward-return performance of every backtestable P/S trade by Russell D. Miller, 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
7d9+44.44%+0.99%+0.83%+0.17%+0.25%—
14d9+11.11%+2.39%+1.52%+0.87%+0.63%—
30d9+33.33%+2.60%+3.66%-1.06%-2.96%—
60d9+44.44%+4.29%+3.50%+0.79%-1.13%—
90d9+33.33%+5.84%+5.29%+0.55%+2.26%—
180d9(1 pending)+12.50%+8.47%+6.13%+2.35%+3.12%—
1y9(2 pending)+14.29%+29.96%+16.66%+13.30%+17.92%—
2y9(3 pending)+0.00%+57.67%+37.41%+20.26%+15.13%—
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 · 8,240 shares · as of Jan 9, 2026
03,8217,64311,46415,285202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
FLOW · 12 buys / 21 sellsCOVERAGE · 23 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
COST
COSTCO WHOLESALE CORP /NEW
SALE
Sr. Executive Vice President
1,500$916.32$1.37M8,240Jan 9, 2026Jan 12, 2026 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Sr. Executive Vice President
3,381$915.00$3.09M9,740Sep 29, 2025Oct 1, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Gift
2,918——13,120Sep 23, 2025Sep 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALEGRANT
Gift
2,918——1.925Sep 23, 2025Sep 24, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
4,654——4,655.01Sep 10, 2025Sep 12, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Sr. Executive Vice President
1,735.085$956.29$1.66M2,919.925Sep 10, 2025Sep 12, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Sr. Executive Vice President
4,400$891.15$3.92M10,202Oct 11, 2024Oct 15, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALEGRANT
Gift
4,602——1.01Sep 24, 2024Sep 26, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Gift
4,602——14,602Sep 24, 2024Sep 26, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Senior EVP
2,832.072$907.87$2.57M4,603.01Sep 16, 2024Sep 18, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
7,433.436——7,435.082Sep 16, 2024Sep 18, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Senior EVP
785$722.86$567.4K10,000Apr 17, 2024Apr 18, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Senior EVP
4,500$557.75$2.51M10,785Nov 3, 2023Nov 6, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Gift
5,192——15,285Sep 26, 2023Sep 28, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALEGRANT
Gift
5,192——1.646Sep 26, 2023Sep 28, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Senior EVP
3,003.054$556.36$1.67M5,193.646Sep 15, 2023Sep 19, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
8,196——8,196.7Sep 15, 2023Sep 19, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Senior EVP
1,500$488.95$733.4K10,093Mar 7, 2023Mar 8, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
1,000$483.58$483.6K11,593Nov 4, 2022Nov 4, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
4,558——0.7Sep 30, 2022Nov 4, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASE
Executive Vice President
4,558——12,593Sep 30, 2022Nov 4, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
7,893——7,893.7Sep 12, 2022Sep 14, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
3,335$539.52$1.80M4,558.7Sep 12, 2022Sep 14, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
4,000$556.02$2.22M8,035Dec 13, 2021Dec 14, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
4,864——0.7Sep 21, 2021Dec 14, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASE
Executive Vice President
4,864——12,035Sep 21, 2021Dec 14, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
8,998——8,998.7Sep 14, 2021Sep 16, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
4,134$458.41$1.90M4,864.7Sep 14, 2021Sep 16, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
5,000$377.24$1.89M7,171Dec 14, 2020Dec 14, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
5,847——0.7Sep 18, 2020Dec 14, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASE
Executive Vice President
5,847——12,171Sep 18, 2020Dec 14, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
10,730——10,730.7Sep 14, 2020Sep 15, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
Executive Vice President
4,883$342.92$1.67M5,847.7Sep 14, 2020Sep 15, 2020 ↗View →
Other insiders · COST
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About this filer
CIK 0001729741
ROLE
Executive Vice President
PRIMARY
COST
COMPANIES
1
ACTIVE SINCE
Sep 2020
MARKETPEEL · /INSIDER/0001729741DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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