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
2025-04-02 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
2024-06-11 2024-06-10 S Sale

Petersen Floyd F.

Non-Executive Director
3,000 -3.7%
41.40
USD 124,200
3,000 -3.7% 41.40 USD 124,200
2024-06-05 2024-06-03 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.6%
42.65
USD 21,326
500 -0.6% 42.65 USD 21,326
2024-05-02 2024-05-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.6%
41.67
USD 20,837
500 -0.6% 41.67 USD 20,837
2024-05-02 2024-05-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.6%
41.67
USD 20,837
500 -0.6% 41.67 USD 20,837
2024-04-02 2024-04-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.6%
43.43
USD 21,714
500 -0.6% 43.43 USD 21,714
2024-03-08 2024-03-06 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
51 -0.0%
48.00
USD 2,448
51 -0.0% 48.00 USD 2,448
2024-03-08 2024-03-06 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
4,681 -4.0%
46.98
USD 219,896
4,681 -4.0% 46.98 USD 219,896
2024-03-08 2024-03-06 PS Planned sale

PETERS WILLIAM J

CFO, EVP & TREASURER

Executive Director
13,404 -10.3%
46.30
USD 620,540
13,404 -10.3% 46.30 USD 620,540
2024-03-06 2024-03-05 S Sale

ZASLOFF MICHAEL A

Non-Executive Director
3,111 -12.7%
47.53
USD 147,853
3,111 -12.7% 47.53 USD 147,853
2024-03-06 2024-03-05 S Sale

ZASLOFF MICHAEL A

Non-Executive Director
9,389 -27.8%
47.06
USD 441,871
9,389 -27.8% 47.06 USD 441,871
2024-03-04 2024-03-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
49 -0.1%
46.53
USD 2,280
49 -0.1% 46.53 USD 2,280
2024-03-04 2024-03-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
451 -0.6%
45.60
USD 20,567
451 -0.6% 45.60 USD 20,567
2024-02-02 2024-02-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
26 -0.0%
53.64
USD 1,395
26 -0.0% 53.64 USD 1,395
2024-02-02 2024-02-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
474 -0.6%
53.07
USD 25,154
474 -0.6% 53.07 USD 25,154
2024-01-11 2024-01-10 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
1,716 -0.2%
57.00
USD 97,817
1,716 -0.2% 57.00 USD 97,817
2024-01-11 2024-01-10 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
920 -0.1%
55.95
USD 51,477
920 -0.1% 55.95 USD 51,477
2024-01-11 2024-01-10 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
50,514 -4.4%
54.89
USD 2,772,506
50,514 -4.4% 54.89 USD 2,772,506
2024-01-11 2024-01-10 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
78,236 -6.3%
54.32
USD 4,249,967
78,236 -6.3% 54.32 USD 4,249,967
2024-01-10 2024-01-09 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
3,714 -0.3%
58.35
USD 216,720
3,714 -0.3% 58.35 USD 216,720
2024-01-10 2024-01-09 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
31,764 -2.5%
57.70
USD 1,832,872
31,764 -2.5% 57.70 USD 1,832,872
2024-01-10 2024-01-09 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
50,678 -3.8%
56.70
USD 2,873,640
50,678 -3.8% 56.70 USD 2,873,640
2024-01-10 2024-01-08 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
2,152 -0.2%
63.27
USD 136,149
2,152 -0.2% 63.27 USD 136,149
2024-01-10 2024-01-08 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
1,663 -0.1%
61.81
USD 102,784
1,663 -0.1% 61.81 USD 102,784
2024-01-10 2024-01-08 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
4,261 -0.3%
61.19
USD 260,742
4,261 -0.3% 61.19 USD 260,742
2024-01-10 2024-01-08 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
27,563 -2.0%
59.99
USD 1,653,623
27,563 -2.0% 59.99 USD 1,653,623
2024-01-10 2024-01-08 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
37,865 -2.7%
59.24
USD 2,243,142
37,865 -2.7% 59.24 USD 2,243,142
2024-01-10 2024-01-08 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
41,282 -2.9%
58.25
USD 2,404,474
41,282 -2.9% 58.25 USD 2,404,474
2024-01-10 2024-01-08 PS Planned sale

Luo Mary Z.

COO,Chief Scientist & Chairman

Executive Director Large shareholder
18,858 -1.3%
56.98
USD 1,074,563
18,858 -1.3% 56.98 USD 1,074,563
2024-01-03 2024-01-02 PS Planned sale

Petersen Floyd F.

Non-Executive Director
353 -0.4%
61.70
USD 21,781
353 -0.4% 61.70 USD 21,781
2024-01-03 2024-01-02 PS Planned sale

Petersen Floyd F.

Non-Executive Director
147 -0.2%
60.56
USD 8,902
147 -0.2% 60.56 USD 8,902
2023-12-05 2023-12-04 S Sale

Zhou Rong

Senior EVP, Production Center

Officer
3,514 -3.0%
59.58
USD 209,364
3,514 -3.0% 59.58 USD 209,364
2023-12-05 2023-12-01 S Sale

Zhou Rong

Senior EVP, Production Center

Officer
4,316 -3.7%
58.58
USD 252,831
4,316 -3.7% 58.58 USD 252,831
2023-12-04 2023-12-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
365 -0.4%
58.15
USD 21,225
365 -0.4% 58.15 USD 21,225
2023-12-04 2023-12-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
135 -0.2%
57.24
USD 7,727
135 -0.2% 57.24 USD 7,727
2023-11-20 2023-11-17 S Sale

PRINS RICHARD K

Non-Executive Director
4,000 -11.1%
55.86
USD 223,446
4,000 -11.1% 55.86 USD 223,446
2023-11-16 2023-11-14 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
14,868 -12.8%
56.53
USD 840,548
14,868 -12.8% 56.53 USD 840,548
2023-11-16 2023-11-14 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
30,162 -20.6%
55.67
USD 1,679,203
30,162 -20.6% 55.67 USD 1,679,203
2023-11-16 2023-11-14 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
14,220 -8.9%
54.76
USD 778,724
14,220 -8.9% 54.76 USD 778,724
2023-11-15 2023-11-14 S Sale

Deflin Gayle

Non-Executive Director
4,163 -60.5%
55.45
USD 230,838
4,163 -60.5% 55.45 USD 230,838
2023-11-15 2023-11-13 S Sale

PRINS RICHARD K

Non-Executive Director
5,000 -12.2%
52.50
USD 262,500
5,000 -12.2% 52.50 USD 262,500
2023-11-02 2023-11-01 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.6%
45.30
USD 22,651
500 -0.6% 45.30 USD 22,651
2023-10-03 2023-10-02 PS Planned sale

Petersen Floyd F.

Non-Executive Director
500 -0.6%
45.78
USD 22,890
500 -0.6% 45.78 USD 22,890
2023-09-08 2023-09-06 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
59 -0.1%
52.26
USD 3,083
59 -0.1% 52.26 USD 3,083
2023-09-08 2023-09-06 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
60,684 -37.4%
51.75
USD 3,140,112
60,684 -37.4% 51.75 USD 3,140,112
2023-08-29 2023-08-28 PS Planned sale

Liawatidewi Yakob

EVP Corp Admin Center

Executive Director
28,816 -29.3%
53.13
USD 1,530,994
28,816 -29.3% 53.13 USD 1,530,994
2023-08-21 2023-08-18 S Sale

PRINS RICHARD K

Non-Executive Director
2,000 -4.7%
52.50
USD 105,006
2,000 -4.7% 52.50 USD 105,006
2023-08-16 2023-08-15 S Sale

ZASLOFF MICHAEL A

Non-Executive Director
12,759 -27.4%
57.22
USD 730,025
12,759 -27.4% 57.22 USD 730,025
2023-08-16 2023-08-15 S Sale

PRINS RICHARD K

Non-Executive Director
4,163 -8.8%
57.39
USD 238,911
4,163 -8.8% 57.39 USD 238,911
2023-06-20 2023-06-15 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
13,000 -11.0%
52.79
USD 686,270
13,000 -11.0% 52.79 USD 686,270
2023-06-20 2023-06-15 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
12,000 -9.2%
50.79
USD 609,480
12,000 -9.2% 50.79 USD 609,480
2023-06-20 2023-06-15 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
11,868 -8.3%
48.79
USD 579,040
11,868 -8.3% 48.79 USD 579,040
2023-06-20 2023-06-15 S Sale

Zhou Rong

EVP, Production Center

Officer
5,000 -4.9%
51.79
USD 258,947
5,000 -4.9% 51.79 USD 258,947
2023-06-14 2023-06-13 S Sale

Zhou Rong

EVP, Production Center

Officer
5,000 -5.4%
48.24
USD 241,200
5,000 -5.4% 48.24 USD 241,200
2023-06-05 2023-06-02 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
11,000 -9.4%
46.35
USD 509,859
11,000 -9.4% 46.35 USD 509,859
2023-06-05 2023-06-01 S Sale

Lee Howard

Non-Executive Director
16,679 -10.4%
45.02
USD 750,960
16,679 -10.4% 45.02 USD 750,960
2023-05-22 2023-05-18 PS Planned sale

PETERS WILLIAM J

CFO, EVP & Treasurer

Executive Director
10,500 -9.1%
44.35
USD 465,675
10,500 -9.1% 44.35 USD 465,675
2023-05-19 2023-05-18 S Sale

Zhou Rong

EVP, Production Center

Officer
10,000 -10.2%
44.21
USD 442,050
10,000 -10.2% 44.21 USD 442,050
2023-05-19 2023-05-18 S Sale

Deflin Gayle

Non-Executive Director
4,519 -52.1%
44.01
USD 198,888
4,519 -52.1% 44.01 USD 198,888
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