Insider trade

Officer sold ~$732K of COST shares in the open market

Traded Mar 9, 2026 · Filed Mar 11, 2026

CostcoCOST

~$732K
Reported value · 730 sh @ $1,003.021: 6,121.2
Holds after · shares reported: -9.0%
stock since the trade · S&P 500 +12.6%, $1,005.30 → $914.94 on Oct 1

Why it stands out

Costco's Executive Vice President sold $732K of Costco shares. Nobody planned it ahead of time.

Written from the filing's own figures. OQRO describes what was reported and never tells you what to buy or sell

View the official recordSEC Form 4 — Statement of Changes in Beneficial Ownership

All the details

Dates, kept separate

Transaction date: Mar 9, 2026
Reporting period: Not applicable
Filed with the SEC: Mar 11, 2026

Officer$500K–$1M

Context

Classification

open market sale

Code S — open-market or private sale

Absolute commitment

~$732,205

Shares × reported transaction price

Timing vs results

4 days after results of Mar 5, 2026, 80 days before results of May 28, 2026

Results dates are the company's own 8-K (Item 2.02). Many companies only let insiders trade in a window after results

Price at the time

Closed at $1,005.30 on Mar 9, 2026, within 5% of its 52-week high, after a 2% rise over the previous 30 trading days

52-week range $850.00 (Dec 22, 2025) to $1,056.85 (Jun 2, 2025), 75% of the way up, from 251 adjusted closes. 30 trading days earlier: $983.25 on Jan 23, 2026. Describes the past only, not a forecast

Planned / mechanical clue

None found in footnotes

Only flagged when a footnote says so; never inferred

After it was reported

After	Stock	S&P 500	Difference
7 days	-2.8%	-0.9%	-1.9%
30 days	-2.2%	+3.0%	-5.3%
90 days	-2.0%	+8.9%	-10.9%
180 days	-9.3%	+15.0%	-24.3%

Past results only. Not a forecast.

Source receipt

Record ID: 0000909832-26-000028
Filed / recorded: Mar 11, 2026, 8:08 PM UTC
Added to OQRO: Oct 2, 2026, 3:52 AM UTC
Parser: form4-xml-v1
Data quality: Verified: identifiers matched exactly
Issuer: COSTCO WHOLESALE CORP /NEW
Issuer CIK: 909832
Ticker: COST
Reporting person: Claudine Adamo
Relationship: Officer
Officer title: Executive Vice President
Security: Common Stock
Table: Non-derivative (Table I)
Transaction date: Mar 9, 2026
Transaction code: S
Shares / units: 730
Price per share: $1,003.021
Acquired / disposed: Disposed (D)
Shares owned after: 6,121.195
Ownership form: Direct
Amendment: No

Around the same time

Officer sold6mo ago

~$695KReported value · 700 sh @ $993.00

6,515 → 5,815 shares held−11% of their stake

Costco's Executive Vice President sold $695K of Costco shares. Nobody planned it ahead of time.

Why it stands out Official record

7mo ago

642.13Shares · @ $991.2129

Not classified as an open-market trade.

Why it stands out Official record

7mo ago

1,154.02Shares · @ $992.23

Routine share withholding; mechanical by default.

Why it stands out Official record

Why it stands out

Dates, kept separate

Context

After it was reported

Source receipt

Around the same time

~$695KReported value · 700 sh @ $993.00

642.13Shares · @ $991.2129

1,154.02Shares · @ $992.23

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