Yakob Liawatidewi

CIK: 0001743927

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)1 (8.3%)

Position reduction

Option Exercises (M)1 (8.3%)

Derivative conversions

Awards (A)2 (16.7%)

Compensation grants

Other (G, F, J, C, D, …)8 (66.7%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

AMPH

Amphastar Pharmaceuticals, Inc.

DirectorOfficer

Discretionary Trading P&L

Holdings

Transaction History (12 total)

AMPH
Amphastar Pharmaceuticals, Inc.
Mar 15, 2026
Tax Payment(F)
Direct
1K shares at avg. $18.18$19K
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 10, 2026
Tax Payment(F)
Direct
1.9K shares at avg. $18.91$35K
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 9, 2026
Award(A)
Direct
35.5K shares-
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 6, 2026
Tax Payment(F)
Direct
1.1K shares at avg. $19.34$22K
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 4, 2026
Tax Payment(F)
Direct
965 shares at avg. $19.96$19K
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 17, 2025
Tax Payment(F)
Direct
1.7K shares at avg. $27.69$48K
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 15, 2025
Tax Payment(F)
Direct
1K shares at avg. $26.66$27K
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 10, 2025
Award(A)
Direct
20.8K shares-
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 6, 2025
Tax Payment(F)
Direct
1.1K shares at avg. $28.32$32K
AMPH
Amphastar Pharmaceuticals, Inc.
Mar 4, 2025
Tax Payment(F)
Direct
963 shares at avg. $27.62$27K
AMPH
Amphastar Pharmaceuticals, Inc.
Nov 6, 2024
Sale(S)
Direct
5.2K shares at avg. $52.05$271K
AMPH
Amphastar Pharmaceuticals, Inc.
Nov 6, 2024
Exercise(M)
Direct
5.2K shares at avg. $13.03$68K

		Type	Shares	Price		Ownership
Mar 15, 2026	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	1,033	$18.18	$18,780	Direct
Mar 10, 2026	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	1,870	$18.91	$35,362	Direct
Mar 9, 2026	AMPH Amphastar Pharmaceuticals, Inc.	Award(A)	35,450	-	$0	Direct
Mar 6, 2026	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	1,144	$19.34	$22,125	Direct
Mar 4, 2026	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	965	$19.96	$19,261	Direct
Mar 17, 2025	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	1,731	$27.69	$47,931	Direct
Mar 15, 2025	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	1,031	$26.66	$27,486	Direct
Mar 10, 2025	AMPH Amphastar Pharmaceuticals, Inc.	Award(A)	20,837	-	-	Direct
Mar 6, 2025	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	1,141	$28.32	$32,313	Direct
Mar 4, 2025	AMPH Amphastar Pharmaceuticals, Inc.	Tax Payment(F)	963	$27.62	$26,598	Direct
Nov 6, 2024	AMPH Amphastar Pharmaceuticals, Inc.	Sale(S)	5,214	$52.05	$271,389	Direct
Nov 6, 2024	AMPH Amphastar Pharmaceuticals, Inc.	Exercise(M)	5,214	$13.03	$67,938	Direct

1-12 of 12 transactions

About Liawatidewi Yakob

Liawatidewi Yakob (SEC CIK 0001743927) files insider reports with the SEC as EVP CORP ADMIN CENTER of Amphastar Pharmaceuticals, Inc. (AMPH).

Signal8 holds 9 ownership filings by Liawatidewi Yakob, all Form 4s, filed between Nov 8, 2024 and Mar 17, 2026. Those filings report 12 transactions, from Nov 6, 2024 to Mar 15, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Liawatidewi Yakob's filings is in RANCHO CUCAMONGA, CA.

Recent filings by Liawatidewi Yakob

Mar 15, 2026: Tax withholding of AMPH shares (Form 4, code F).
Mar 10, 2026: Tax withholding of AMPH shares (Form 4, code F).
Mar 9, 2026: Grant or award of AMPH shares (Form 4, code A).
Mar 6, 2026: Tax withholding of AMPH shares (Form 4, code F).
Mar 4, 2026: Tax withholding of AMPH shares (Form 4, code F).

Other insiders filing for Amphastar Pharmaceuticals, Inc. (AMPH)

PETERS WILLIAM J, CFO, EVP & TREASURER
Zhou Rong, SENIOR EVP, PRODUCTION CENTER
PRINS RICHARD K, Director
Pierce Anthony T, Director
Lee Howard, Director
ZASLOFF MICHAEL A, Director

How to read Form 4 transaction codes