Stock chart
Ticker: AMPH Exchange: NSM


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Purchase Sale Planned purchase Planned sale Net purchase Net sale Earnings
Earnings
 
Value bought

Past 90 days

 
Value sold

Past 90 days

 
Net insiders buying

Past 90 days

 
Trades (buy and sell)

Past 90 days

Abbreviations B: Buy, S: Sell, PP: Planned purchase, PS: Planned sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value
Number of shares Price Value Details
2025-07-03 2025-07-02 PS Planned sale

Petersen Floyd F.

Non-Executive Director
1,000 -0.6%
23.47
USD 11,734
1,000 -0.6% 23.47 USD 100,000
2025-06-04 2025-06-02 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.7%
25.67
USD 12,835
500 -0.7% 25.67 USD 12,835
2025-05-02 2025-05-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.7%
24.08
USD 12,041
500 -0.7% 24.08 USD 12,041
2025-04-02 2025-04-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.7%
28.38
USD 14,190
500 -0.7% 28.38 USD 14,190
2025-03-07 2025-03-06 PS Planned sale

Petersen Floyd F.

Non-Executive Director
1,000 -1.3%
27.99
USD 27,986
1,000 -1.3% 27.99 USD 27,986
2025-03-06 2025-03-04 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
4,231 -4.2%
27.54
USD 116,515
4,231 -4.2% 27.54 USD 116,515
2024-12-16 2024-12-13 S Sale

Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
8,000 -6.3%
45.23
USD 361,840
8,000 -6.3% 45.23 USD 361,840
2024-12-16 2024-12-12 S Sale

Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
7,000 -5.6%
44.43
USD 310,975
7,000 -5.6% 44.43 USD 310,975
2024-12-11 2024-12-09 S Sale

PRINS RICHARD K

Non-Executive Director
10,000 -24.7%
43.77
USD 437,702
10,000 -24.7% 43.77 USD 437,702
2024-11-13 2024-11-12 S Sale

Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
6,893 -5.5%
48.88
USD 336,930
6,893 -5.5% 48.88 USD 336,930
2024-11-13 2024-11-12 S Sale

PRINS RICHARD K

Non-Executive Director
5,000 -13.7%
48.80
USD 243,986
5,000 -13.7% 48.80 USD 243,986
2024-11-08 2024-11-06 PS Planned sale

Liawatidewi Yakob

EVP CORP ADMIN CENTER

Executive Director
5,214 -6.5%
52.05
USD 271,389
5,214 -6.5% 52.05 USD 271,389
2024-11-08 2024-11-06 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
7,426 -7.3%
52.05
USD 386,523
7,426 -7.3% 52.05 USD 386,523
2024-09-17 2024-09-13 S Sale

Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
3,000 -2.5%
48.26
USD 144,785
3,000 -2.5% 48.26 USD 144,785
2024-09-06 2024-09-05 S Sale

Petersen Floyd F.

Non-Executive Director
3,000 -3.8%
46.47
USD 139,417
3,000 -3.8% 46.47 USD 139,417
2024-08-27 2024-08-26 S Sale

Zhou Rong

SENIOR EVP, PRODUCTION CENTER

Officer
4,000 -3.3%
48.35
USD 193,400
4,000 -3.3% 48.35 USD 193,400
2024-08-13 2024-08-12 S Sale

PRINS RICHARD K

Non-Executive Director
17,101 -33.5%
43.07
USD 736,550
17,101 -33.5% 43.07 USD 736,550
2024-08-02 2024-07-31 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
10,282 -9.9%
44.23
USD 454,773
10,282 -9.9% 44.23 USD 454,773
2024-06-28 2024-06-27 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
635 -0.7%
41.29
USD 26,222
635 -0.7% 41.29 USD 26,222
2024-06-28 2024-06-27 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
2,961 -3.0%
40.85
USD 120,947
2,961 -3.0% 40.85 USD 120,947
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