Amphastar Pharmaceuticals, Inc. (AMPH)

NASDAQ

$20.09

-$0.44 (2.14%)

Today

No price data available for this timeframe.

Key Statistics

Day Range

$19.90$20.55

Open $19.90

52 Week Range

$16.65$31.26

Previous Close $20.53

Market Cap885.83M

Volume376.51K

Avg Volume593.90K

P/E (TTM)11.09

EPS (TTM)$1.75

Dividend / YieldN/A

Dividend StreakN/A

AMPH Insider Trading

Amphastar Pharmaceuticals, Inc. (AMPH) has had 13 insider transactions recently, with net insider activity of +$152K (net buying). The most active insider is Zhang Jack Y. (Director, 10 percent owner, officer: ceo & chief scientific officer).

Insider Trading Summary(Q2 2026)

Total Transactions

12 buys /1 sells

Shares Acquired

153,048

Transactions: 12•Avg: 12,754

Shares Disposed

769

Transactions: 1•Avg: 769

Net Activity

+152,279

Net Buying•Ratio: 1,200%

Quarterly Insider Trading Summary


Q2 2026(Current)	153,048	769	+152,279	1200.00%
Q1 2026	1,183,889	71,016	+1,112,873	50.00%
Q4 2025	30,645	66,453	-35,808	30.00%
Q3 2025	20,291	1,500	+18,791	66.67%
Q2 2025	299,144	202,696	+96,448	216.67%

Showing 1 to 5 of 55 entries

This table shows insider trading activity by quarter. A ratio > 100% indicates insiders acquired more shares than they disposed of during the period, which is generally considered a bullish signal.

Market Transactions

Stock Purchases

Acquired Shares:153,048

Transactions:12

Avg per Transaction:12,754

Insider acquisitions during this period

Stock Sales

Disposed Shares:769

Transactions:1

Avg per Transaction:769

Insider dispositions during this period

Buy/Sell Ratio:1,200%

More shares acquired than disposed in this period

• Most recent data for Q2 2026

Insider Buy/Sell Activity

Quarterly Transaction Count

Q2 2026

12/1

Q1 2026

10/20

Q4 2025

3/10

Q3 2025

2/3

Acquired

Disposed

Quarterly Share Volume

Q2 2026

Net Activity by Quarter

Values in thousands of shares

-39k

Q3 2024

-301k

Q4 2024

+602k

Q1 2025

+96k

Q2 2025

+19k

Q3 2025

-36k

Q4 2025

+1113k

Q1 2026

+152k

Q2 2026

Buy/Sell Ratio

1,200%

Bullish signal

Activity Trend

Increasing

Based on 55 quarters of data

Current Net Activity

+152,279 shares

$0 value

Acquired vs Disposed Shares

Net Accumulation: 152,279 shares•Acquired/Disposed Ratio: 1,200%

Top Insider Activity

					Net Activity
ZJY Zhang Jack Y.	Director, 10 percent owner, officer: ceo & chief scientific officer	23	1,476,466	888,331	+588,135
ZR Zhou Rong	Officer: senior evp, production center	13	207,689	28,684	+179,005
PWJ PETERS WILLIAM J	Director, officer: cfo, evp & treasurer	9	179,764	14,405	+165,359
LY Liawatidewi Yakob	Director, officer: evp corp admin center	9	129,413	7,774	+121,639
GDR Gaugh David Russell	Director	5	45,799	0	+45,799

Showing 1 to 5 of 5 entries

This table shows the trading activity of the most active company insiders. Positive net activity (buying more than selling) is often considered a bullish signal.

Recent Insider Transactions


2026-06-01	PRINS RICHARD K	Director	Purchase	8,143	$0	$0	37,598
2024-08-19	PRINS RICHARD K	Director	Sale	1,500	$0	$0	29,455
2026-06-01	PRINS RICHARD K	Director	Purchase	17,365	$18.42	$319,863.3	17,365
2026-06-01	Lee Howard	Director	Purchase	8,143	$0	$0	160,119
2026-06-02	Lee Howard	Director	Sale	769	$18.45	$14,188.05	159,350

Showing 1 to 5 of 100 entries

This table displays recent Form 4 filings showing transactions by company insiders. SEC rules require insiders to report their transactions within two business days.

Recent SEC Filings


PRK PRINS RICHARD K	Director	Jun 3, 2026	View Filing
PRK PRINS RICHARD K	Director	Jun 3, 2026	View Filing
PRK PRINS RICHARD K	Director	Jun 3, 2026	View Filing
LH Lee Howard	Director	Jun 3, 2026	View Filing
LH Lee Howard	Director	Jun 3, 2026	View Filing

Showing 1 to 5 of 5 entries

AMPH Insider Trading

Insider Trading Summary(Q2 2026)

Total Transactions

12 buys /1 sells

Shares Acquired

153,048

Transactions: 12•Avg: 12,754

Shares Disposed

769

Transactions: 1•Avg: 769

Net Activity

+152,279

Net Buying•Ratio: 1,200%

Quarterly Insider Trading Summary


Q2 2026(Current)	153,048	769	+152,279	1200.00%
Q1 2026	1,183,889	71,016	+1,112,873	50.00%
Q4 2025	30,645	66,453	-35,808	30.00%
Q3 2025	20,291	1,500	+18,791	66.67%
Q2 2025	299,144	202,696	+96,448	216.67%

Showing 1 to 5 of 55 entries

This table shows insider trading activity by quarter. A ratio > 100% indicates insiders acquired more shares than they disposed of during the period, which is generally considered a bullish signal.

Market Transactions

Stock Purchases

Acquired Shares:153,048

Transactions:12

Avg per Transaction:12,754

Insider acquisitions during this period

Stock Sales

Disposed Shares:769

Transactions:1

Avg per Transaction:769

Insider dispositions during this period

Buy/Sell Ratio:1,200%

More shares acquired than disposed in this period

• Most recent data for Q2 2026

Insider Buy/Sell Activity

Quarterly Transaction Count

Q2 2026

12/1

Q1 2026

10/20

Q4 2025

3/10

Q3 2025

2/3

Acquired

Disposed

Quarterly Share Volume

Q2 2026

Net Activity by Quarter

Values in thousands of shares

-39k

Q3 2024

-301k

Q4 2024

+602k

Q1 2025

+96k

Q2 2025

+19k

Q3 2025

-36k

Q4 2025

+1113k

Q1 2026

+152k

Q2 2026

Buy/Sell Ratio

1,200%

Bullish signal

Activity Trend

Increasing

Based on 55 quarters of data

Current Net Activity

+152,279 shares

$0 value

Acquired vs Disposed Shares

Net Accumulation: 152,279 shares•Acquired/Disposed Ratio: 1,200%

Top Insider Activity

					Net Activity
ZJY Zhang Jack Y.	Director, 10 percent owner, officer: ceo & chief scientific officer	23	1,476,466	888,331	+588,135
ZR Zhou Rong	Officer: senior evp, production center	13	207,689	28,684	+179,005
PWJ PETERS WILLIAM J	Director, officer: cfo, evp & treasurer	9	179,764	14,405	+165,359
LY Liawatidewi Yakob	Director, officer: evp corp admin center	9	129,413	7,774	+121,639
GDR Gaugh David Russell	Director	5	45,799	0	+45,799

Showing 1 to 5 of 5 entries

This table shows the trading activity of the most active company insiders. Positive net activity (buying more than selling) is often considered a bullish signal.

Recent Insider Transactions


2026-06-01	PRINS RICHARD K	Director	Purchase	8,143	$0	$0	37,598
2024-08-19	PRINS RICHARD K	Director	Sale	1,500	$0	$0	29,455
2026-06-01	PRINS RICHARD K	Director	Purchase	17,365	$18.42	$319,863.3	17,365
2026-06-01	Lee Howard	Director	Purchase	8,143	$0	$0	160,119
2026-06-02	Lee Howard	Director	Sale	769	$18.45	$14,188.05	159,350

Showing 1 to 5 of 100 entries

This table displays recent Form 4 filings showing transactions by company insiders. SEC rules require insiders to report their transactions within two business days.

Recent SEC Filings


PRK PRINS RICHARD K	Director	Jun 3, 2026	View Filing
PRK PRINS RICHARD K	Director	Jun 3, 2026	View Filing
PRK PRINS RICHARD K	Director	Jun 3, 2026	View Filing
LH Lee Howard	Director	Jun 3, 2026	View Filing
LH Lee Howard	Director	Jun 3, 2026	View Filing

Showing 1 to 5 of 5 entries