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Insider Trading Intelligence
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Susan L. Decker

COST
DIRECTOR · COSTCO WHOLESALE CORP /NEW · CIK 0001234655
FILING MIX · LIFETIME39%/61%
BUYS
24
SELLS
38
TOTAL VALUE
$12.59M
COMPANIES
3
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
35,143
AVG SELL PX
$419.76
TRADE KIND
SHOWING 62 / 62
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
28 backtested trades · 8 horizons · 6 pending
Forward-return performance of every backtestable P/S trade by Susan L. Decker, 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
7d28+35.71%+0.74%+1.33%-0.58%-0.20%—
14d28+32.14%+0.86%+1.88%-1.01%-1.22%—
30d28+46.43%+0.96%+3.43%-2.47%-1.58%—
60d28+25.00%+2.86%+5.68%-2.83%-0.87%—
90d28+28.57%+5.12%+7.86%-2.74%+0.29%—
180d28(1 pending)+7.41%+13.51%+15.63%-2.13%-2.60%—
1y28(1 pending)+7.41%+35.96%+30.12%+5.84%+8.54%—
2y28(4 pending)+0.00%+63.82%+31.38%+32.44%+34.13%—
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 · 8,531.936 shares · as of Jan 16, 2026
08,64617,29125,93734,582202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 24 buys / 38 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
CHYM
CHIME FINANCIAL, INC.
PURCHASEGRANT
Stock grant
10,753——25,048Jun 2, 2026Jun 4, 2026 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
458$955.00$437.4K8,531.936Jan 16, 2026Jan 20, 2026 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALEGRANT
Gift
2,827——8,989.936Dec 15, 2025Dec 17, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
286——11,816.936Oct 22, 2025Oct 24, 2025 ↗View →
MTN
VAIL RESORTS INC
PURCHASEGRANT
Stock grant
1,563——1,563Sep 30, 2025Oct 1, 2025 ↗View →
MTN
VAIL RESORTS INC
PURCHASE
1,281——9,389Sep 27, 2025Sep 30, 2025 ↗View →
MTN
VAIL RESORTS INC
SALE
1,281——0Sep 27, 2025Sep 30, 2025 ↗View →
CHYM
CHIME FINANCIAL, INC.
PURCHASEGRANT
Stock grant
7,628——14,295Aug 27, 2025Aug 29, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
546$980.00$535.1K11,531.936Jun 18, 2025Jun 20, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1$978.40$97811,530.936Jun 18, 2025Jun 20, 2025 ↗View →
CHYM
CHIME FINANCIAL, INC.
PURCHASE
57,000——57,000Jun 13, 2025Jun 13, 2025 ↗View →
CHYM
CHIME FINANCIAL, INC.
SALE
6,667——0Jun 13, 2025Jun 13, 2025 ↗View →
CHYM
CHIME FINANCIAL, INC.
PURCHASE
6,667——6,667Jun 13, 2025Jun 13, 2025 ↗View →
CHYM
CHIME FINANCIAL, INC.
SALE
57,000——0Jun 13, 2025Jun 13, 2025 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
303——12,077.936Oct 22, 2024Oct 24, 2024 ↗View →
MTN
VAIL RESORTS INC
SALE
1,031——0Sep 29, 2024Oct 1, 2024 ↗View →
MTN
VAIL RESORTS INC
PURCHASE
1,031——8,108Sep 29, 2024Oct 1, 2024 ↗View →
MTN
VAIL RESORTS INC
PURCHASEGRANT
Stock grant
1,281——1,281Sep 27, 2024Oct 1, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
620$876.50$543.4K11,774.936Aug 15, 2024Aug 15, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,442$723.48$1.04M12,394.936Feb 9, 2024Feb 12, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
18.936——13,836.936Jan 12, 2024Jan 12, 2024 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
489——13,818Oct 22, 2023Oct 24, 2023 ↗View →
MTN
VAIL RESORTS INC
PURCHASEGRANT
Stock grant
1,031——1,031Sep 29, 2023Oct 3, 2023 ↗View →
MTN
VAIL RESORTS INC
SALE
1,071——0Sep 29, 2023Oct 3, 2023 ↗View →
MTN
VAIL RESORTS INC
PURCHASE
1,071——7,077Sep 29, 2023Oct 3, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,565$533.00$834.1K13,329Jun 28, 2023Jun 29, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,445$517.50$747.8K14,894Jun 7, 2023Jun 9, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
2,007$512.02$1.03M16,858Jun 7, 2023Jun 9, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
519$513.00$266.2K16,339Jun 7, 2023Jun 9, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALEGRANT
Gift
55——18,865Dec 20, 2022Jun 9, 2023 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
952$483.00$459.8K18,920Dec 12, 2022Dec 13, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
565——19,872Oct 22, 2022Oct 25, 2022 ↗View →
MTN
VAIL RESORTS INC
PURCHASEGRANT
Stock grant
1,071——1,071Sep 29, 2022Oct 3, 2022 ↗View →
MTN
VAIL RESORTS INC
SALE
599——0Sep 24, 2022Sep 27, 2022 ↗View →
MTN
VAIL RESORTS INC
PURCHASE
599——6,082Sep 24, 2022Sep 27, 2022 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
561——19,307Oct 22, 2021Oct 26, 2021 ↗View →
MTN
VAIL RESORTS INC
PURCHASE
922——5,483Sep 25, 2021Sep 28, 2021 ↗View →
MTN
VAIL RESORTS INC
SALE
922——0Sep 25, 2021Sep 28, 2021 ↗View →
MTN
VAIL RESORTS INC
PURCHASEGRANT
Stock grant
599——599Sep 24, 2021Sep 28, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
301$362.50$109.1K18,746Jan 27, 2021Jan 29, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
393$364.00$143.1K19,047Jan 27, 2021Jan 29, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
100$365.18$36.5K20,000Jan 13, 2021Jan 13, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
560$368.00$206.1K19,440Jan 13, 2021Jan 13, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
539$365.15$196.8K20,100Jan 13, 2021Jan 13, 2021 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
861$375.75$323.5K20,639Dec 30, 2020Dec 30, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,000$362.59$362.6K21,500Dec 21, 2020Dec 22, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
34——22,500Dec 11, 2020Dec 11, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
PURCHASEGRANT
Stock grant
719——22,466Oct 22, 2020Oct 22, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
2,500$347.90$869.8K21,747Sep 28, 2020Sep 29, 2020 ↗View →
MTN
VAIL RESORTS INC
PURCHASEGRANT
Stock grant
922——922Sep 25, 2020Sep 29, 2020 ↗View →
MTN
VAIL RESORTS INC
SALE
910——0Sep 25, 2020Sep 29, 2020 ↗View →
MTN
VAIL RESORTS INC
PURCHASE
910——4,931Sep 25, 2020Sep 29, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,250$338.00$422.5K24,247Aug 14, 2020Aug 17, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,250$335.84$419.8K25,497Aug 13, 2020Aug 17, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,000$326.70$326.7K27,747Jul 13, 2020Jul 14, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,000$326.50$326.5K26,747Jul 13, 2020Jul 14, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
685$308.50$211.3K28,747Jul 2, 2020Jul 2, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,155$302.57$349.5K29,432Jul 1, 2020Jul 1, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,995$312.00$622.4K30,587Jun 5, 2020Jun 5, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,000$314.83$314.8K32,582Apr 20, 2020Apr 21, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
1,000$297.00$297.0K33,582Mar 20, 2020Mar 20, 2020 ↗View →
COST
COSTCO WHOLESALE CORP /NEW
SALE
3,850$300.41$1.16M34,582Jan 14, 2020Jan 15, 2020 ↗View →
Other insiders · COST
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About this filer
CIK 0001234655
ROLE
Director
PRIMARY
COST
COMPANIES
3
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001234655DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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