Latest filingSep 14, 2026Most recent Form 4
COST
COSTCO WHOLESALE CORP /NEW
NasdaqConsumer DiscretionaryRetail-Variety Stores
Insider activity for last month from 08/16 to 09/16. 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 buying$00 buys
Total selling$00 sells
Net open-market+$04 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period8transactions
- A · Grants / awards · dominant4 · 50%
- F · Tax withholding4 · 50%
Activity by reported role
A joint filing can contribute to multiple roles8transactions
- EVP · dominant8 · 100%
Distinct insiders active
Reporting-owner CIKs by month · peak Sep 2026 (4)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeAdamo ClaudineCommon Stock · Direct
10,250.195Sep 10, 2026
Frates CatonCommon Stock · Direct
10,367.001Sep 10, 2026
Jones Teresa A.Common Stock · Direct
8,056.804Sep 10, 2026
Klauer James CCommon Stock · Direct
48,965.994Sep 10, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 16 → Sep 16
LessMore
Top insiders
By absolute net value across the selected period- FC-$1.5M
- JA-$1.3M
- KC-$844.7k
- AC-$827.2k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
No filing-only signal badges matched this period.
COST transaction history
Filters apply within this company and selected period by defaultLatest insider transactions
Form 4 filings from last month. Click any column to sort; click it again to flip the order.
| ID | Ticker | Insider | Role | Type | Shares | Value | Code | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|
| #219795 | COST | Klauer James C | EVP | withholding | 936 | -$84.4M | F | 09/14 | 09/10 |
| #219794 | COST | Klauer James C | EVP | grant | 4.12k | $0 | A | 09/14 | 09/10 |
| #219637 | COST | Jones Teresa A. | EVP | withholding | 1.45k | -$131M | F | 09/14 | 09/10 |
| #219636 | COST | Jones Teresa A. | EVP | grant | 4.12k | $0 | A | 09/14 | 09/10 |
| #219536 | COST | Frates Caton | EVP | withholding | 1.65k | -$149M | F | 09/14 | 09/10 |
| #219535 | COST | Frates Caton | EVP | grant | 4.55k | $0 | A | 09/14 | 09/10 |
| #219348 | COST | Adamo Claudine | EVP | withholding | 917 | -$82.7M | F | 09/14 | 09/10 |
| #219347 | COST | Adamo Claudine | EVP | grant | 4.12k | $0 | A | 09/14 | 09/10 |
COSTCO WHOLESALE CORP /NEW Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at COSTCO WHOLESALE CORP /NEW?
Klauer James C, Jones Teresa A., Frates Caton, Adamo Claudine.
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?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
No code-P purchases or code-S sales were reported in the selected period.
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.