Total buying$00 buys
COST
COSTCO WHOLESALE CORP NEW
NasdaqConsumer DiscretionaryRETAIL-VARIETY STORES
Insider activity for last month from 10/02 to 11/02.
How these metrics are calculated
Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total selling$1.05M1 sells
Net open-market−$1.05MBuying minus selling
Active insiders18Distinct reporting owners
Insider activity report
Calendar-month buckets within the selected date range
Latest filing: Oct 27, 2026
Open-market transaction mix · 1 transactions in the selected period
Code A includes awards, grants and other acquisitions; these are not open-market buys. A rolling period can include partial calendar months.
View exact monthly counts and disclosed values
| Month | Buys | Sells | Awards (A) | Buy value | Sell value | Net P/S value |
|---|---|---|---|---|---|---|
| Oct 2026 | 0 | 1 | 13 | $0 | $1.05M | -$1.05M |
| Nov 2026 | 0 | 0 | 0 | $0 | $0 | $0 |
Distinct insiders active
Reporting-owner CIKs by month · peak Oct 2026 (18)Oct 2026Nov 2026
Largest insider activity
By absolute net disclosed value · current transaction page- KC-$2.1M
- GC-$264.5k
- BM-$255.6k
- SW+$0
- RM+$0
COST transaction history
Newest filings · 20 transactions per pageLatest insider transactions
Form 4 filings from last month.Filing-only signals
Deterministic matches in the selected period
Filing detail checks
Secondary metrics for the selected periodTransaction codes
By Form 4 transaction code in selected period50transactionstxns
- F · Tax withholding · dominant36 · 72%
- A · Grants / awards13 · 26%
- S · Open-market sells1 · 2%
Activity by reported role
A joint filing can contribute to multiple rolesEVP25
Director9
EV6
PAO6
PRES4
Reported Holdings After
Separated by insider, security, and ownership type
Barbre Tiffany MarieCommon Stock · Direct
6,583.68Oct 22, 2026
Sullivan John ChristopherCommon Stock · Direct
48,459.895Oct 22, 2026
Adamo ClaudineCommon Stock · Direct
6,441.647Oct 22, 2026
George Sarah CatherineCommon Stock · Direct
3,868.075Oct 22, 2026
Klauer James CCommon Stock · Direct
45,928.514Oct 22, 2026
Self Adam WebbCommon Stock · Direct
3,269.585Oct 22, 2026
Vachris Roland MichaelCommon Stock · Direct
62,575.444Oct 22, 2026
Millerchip GaryCommon Stock · Direct
19,974.559Oct 22, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Current transaction page only · each cell is a filing date · buys green, sells redOct 02 → Nov 02
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COSTCO WHOLESALE CORP NEW Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at COSTCO WHOLESALE CORP NEW?
Sullivan John Christopher, Self Adam Webb, MILLERCHIP GARY, Vachris Roland Michael, Wilderotter Mary Agnes, STANTON JOHN W, Raimondo Gina Marie, RAIKES JEFFREY S, Klauer James C, JEWELL SARAH MR SALLY, JAMES HAMILTON E, George Sarah Catherine.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Wilcox William Richard reported a sale on Oct 13, 2026 valued at $1.05M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $1,054,025.50. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.