BROWN OSCAR K exercised options at WESTERN MIDSTREAM PARTNERS, LP

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 1 exercise

BROWN OSCAR K

Filed: 10/29/2025ACC: 0001715126-25-000004

InsiderBROWN OSCAR KCIK 1715126

→

IssuerWESTERN MIDSTREAM PARTNERS, LPCIK 1423902

Director

Since Aug 2019

-20.72K

Net shares

Net seller

$803.6K

Total sold

Open market trades

0B · 0S

Total transactions

52.66K acquired · 73.38K disposed

Non-Derivative Transactions2

Common Units representing limited partner interests

Direct

M · Option Exercise

+52.66K

Price / share

—

Trade value

—

% of position

131.7%

10/28/2025

39.99K→92.65K

Common Units representing limited partner interests

Direct

F · Tax Withholding

−20.72K

Price / share

$38.78

Trade value

$803.60K

% of position

22.4%

10/28/2025

92.65K→71.93K

Total

Net shares

+31.94K

Net value

-$803.60K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Units representing limited partner interests Direct	10/28/2025	M · Option Exercise	+52.66K	—	—	131.7%	39.99K	92.65K
Common Units representing limited partner interests Direct	10/28/2025	F · Tax Withholding	−20.72K	$38.78	$803.60K	22.4%	92.65K	71.93K
Total			+31.94K		-$803.60K

Derivative Transactions1

2024 Phantom Units

Direct

M · Option Exercise

Converts to

Common Units representing limited partner interests

52.66K shares

−52.66K

Strike price

Held after

105.32K

Exercisable

—

10/28/2025

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
2024 Phantom Units Direct	Common Units representing limited partner interests52.66K shares	10/28/2025	M · Option Exercise	−52.66K		—	105.32K

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)3

2025 Performance Unit-TUR

Direct

Underlying security

Common Units representing limited partner interests

Underlying shares

36.03K

Shares owned

36.03K

Exercise price

Expiration

—

Exercise window

—

2025 Performance Unit-ROA

Direct

Underlying security

Common Units representing limited partner interests

Underlying shares

36.03K

Shares owned

36.03K

Exercise price

Expiration

—

Exercise window

—

2025 Phantom Units

Direct

Underlying security

Common Units representing limited partner interests

Underlying shares

72.06K

Shares owned

72.06K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

144.13K

Owned

144.13K

Security	Underlying	Exercise Window	Expiration	Underlying Shares	Shares Owned
2025 Performance Unit-TUR Direct	Common Units representing limited partner interests	—	—	36.03K	36.03K
2025 Performance Unit-ROA Direct	Common Units representing limited partner interests	—	—	36.03K	36.03K
2025 Phantom Units Direct	Common Units representing limited partner interests	—	—	72.06K	72.06K
Total				144.13K	144.13K