Insider trading

Period: 120 months Stock: AMPH + Add filter Clear all
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When

Period

How far back the list reaches. Filings arrive days after the trade, so the newest rows always lag a little.

341 decisions over 120 months
Who

Role

The position the person holds at the company, read from the title on the filing. A chief executive who is also a director counts as the chief executive.

341 decisions over 120 months
The trade

Type of trade

Purchases, sales, or cluster buys: companies where 3 or more insiders bought within 30 days. The number beside each is what that choice would give.

341 decisions over 120 months
The trade

Minimum amount

Hides rows under this value. The amount is the shares traded times the price on the filing.

341 decisions over 120 months
The trade

Plan

  • Discretionary: they chose to sell that week.
  • Scheduled: a 10b5-1 plan fixed the sale months in advance, so the timing says nothing about what they knew.
  • Not stated: filed before the SEC added the box in April 2023, which is most of the older half of this database.
341 decisions over 120 months
The trade

Share of their own holding

How much of what they already held the trade moved. Selling a tenth of a stake is not the same act as selling all of it.

At least
341 decisions over 120 months
Ownership

What the chief executive holds

The value of the chief executive’s stock measured against base salary. The salary comes from the company’s own proxy. Companies with no figure are in neither direction.

341 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
21 Sep 2026
PETERS WILLIAM J CFO, EVP & TREASURER
Sold on a plan
$103.48K 4,139 at 25.00
2.4%
Planned (10b5-1)
16 Sep 2026
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$239.40K 10,000 at 23.94
5.6%
Not planned
2 Sep 2026
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$75.31K 3,187 at 23.63
1.8%
Not planned
11 Aug 2026
PRINS RICHARD K Director
Sold at will
$161.85K 7,973 at 20.30
21.2%
Not planned
7 Aug 2026
PETERS WILLIAM J CFO, EVP & TREASURER
Sold on a plan
$183.89K 8,180 at 22.48
4.5%
Planned (10b5-1)
17 Dec 2025
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$256.38K 9,787 at 26.20
6.6%
Not planned
12 Dec 2025
Sold at will
$62.89K 2,426 at 25.92
3.3%
Not planned
11 Dec 2025
Sold at will
$44.62K 1,737 at 25.69
2.3%
Not planned
25 Nov 2025
PRINS RICHARD K Director
Sold at will
$113.25K 4,179 at 27.10
10.6%
Not planned
13 Nov 2025
Sold at will
$441.84K 16,679 at 26.49
18.1%
Not planned
3 Nov 2025
Sold on a plan
$12.63K 500 at 25.27
0.7%
Planned (10b5-1)
1 Oct 2025
Sold on a plan
$13.60K 500 at 27.20
0.7%
Planned (10b5-1)
2 Sep 2025
Sold on a plan
$15.49K 500 at 30.98
0.6%
Planned (10b5-1)
1 Aug 2025
Sold on a plan
$10.42K 500 at 20.83
0.6%
Planned (10b5-1)
2 Jul 2025
Sold on a plan
$11.73K 500 at 23.47
0.6%
Planned (10b5-1)
2 Jun 2025
Sold on a plan
$12.84K 500 at 25.67
0.7%
Planned (10b5-1)
1 May 2025
Sold on a plan
$12.04K 500 at 24.08
0.7%
Planned (10b5-1)
1 Apr 2025
Sold on a plan
$14.19K 500 at 28.38
0.7%
Planned (10b5-1)
6 Mar 2025
Sold on a plan
$27.99K 1,000 at 27.99
1.3%
Planned (10b5-1)
4 Mar 2025
PETERS WILLIAM J CFO, EVP & TREASURER
Sold on a plan
$116.52K 4,231 at 27.54
4.2%
Planned (10b5-1)
13 Dec 2024
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$361.84K 8,000 at 45.23
6.3%
Not planned
12 Dec 2024
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$310.98K 7,000 at 44.43
5.6%
Not planned
9 Dec 2024
PRINS RICHARD K Director
Sold at will
$437.70K 10,000 at 43.77
24.7%
Not planned
12 Nov 2024
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$336.93K 6,893 at 48.88
5.5%
Not planned
12 Nov 2024
PRINS RICHARD K Director
Sold at will
$243.99K 5,000 at 48.80
13.7%
Not planned
6 Nov 2024
PETERS WILLIAM J CFO, EVP & TREASURER
Sold on a plan
$386.52K 7,426 at 52.05
7.3%
Planned (10b5-1)
6 Nov 2024
Liawatidewi Yakob EVP CORP ADMIN CENTER
Sold on a plan
$271.39K 5,214 at 52.05
6.5%
Planned (10b5-1)
13 Sep 2024
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$144.78K 3,000 at 48.26
2.5%
Not planned
5 Sep 2024
Sold at will
$139.42K 3,000 at 46.47
3.8%
Not planned
26 Aug 2024
Zhou Rong SENIOR EVP, PRODUCTION CENTER
Sold at will
$193.40K 4,000 at 48.35
3.3%
Not planned
12 Aug 2024
PRINS RICHARD K Director
Sold at will
$736.55K 17,101 at 43.07
33.5%
Not planned
31 Jul 2024
PETERS WILLIAM J CFO, EVP & TREASURER
Sold on a plan
$454.77K 10,282 at 44.23
9.9%
Planned (10b5-1)
27 Jun 2024
PETERS WILLIAM J CFO, EVP & TREASURER
Sold on a plan 2×
$147.17K 3,596 at 40.93
3.7%
Planned (10b5-1)
10 Jun 2024
Sold at will
$124.20K 3,000 at 41.40
3.7%
Not planned
3 Jun 2024
Sold on a plan
$21.33K 500 at 42.65
0.6%
Planned (10b5-1)
1 May 2024
Sold on a plan
$20.84K 500 at 41.67
0.6%
Planned (10b5-1)
1 Apr 2024
Sold on a plan
$21.71K 500 at 43.43
0.6%
Planned (10b5-1)
6 Mar 2024
PETERS WILLIAM J CFO, EVP & TREASURER
Sold on a plan 3×
$842.88K 18,136 at 46.48
14.0%
Planned (10b5-1)
5 Mar 2024
Sold at will 2×
$589.72K 12,500 at 47.18
37.0%
Not planned
1 Mar 2024
Sold on a plan 2×
$22.85K 500 at 45.69
0.6%
Planned (10b5-1)
1 Feb 2024
Sold on a plan 2×
$26.55K 500 at 53.10
0.6%
Planned (10b5-1)
10 Jan 2024
Luo Mary Z. COO,Chief Scientist & Chairman
Sold on a plan 4×
$7.17M 131,386 at 54.59
10.6%
Planned (10b5-1)
9 Jan 2024
Luo Mary Z. COO,Chief Scientist & Chairman
Sold on a plan 3×
$4.92M 86,156 at 57.14
6.5%
Planned (10b5-1)
8 Jan 2024
Luo Mary Z. COO,Chief Scientist & Chairman
Sold on a plan 7×
$7.88M 133,644 at 58.93
9.2%
Planned (10b5-1)
2 Jan 2024
Sold on a plan 2×
$30.68K 500 at 61.37
0.6%
Planned (10b5-1)
4 Dec 2023
Zhou Rong Senior EVP, Production Center
Sold at will
$209.36K 3,514 at 59.58
3.0%
Not planned
1 Dec 2023
Zhou Rong Senior EVP, Production Center
Sold at will
$252.83K 4,316 at 58.58
3.7%
Not planned
1 Dec 2023
Sold on a plan 2×
$28.95K 500 at 57.90
0.6%
Planned (10b5-1)
17 Nov 2023
PRINS RICHARD K Director
Sold at will
$223.45K 4,000 at 55.86
11.1%
Not planned
14 Nov 2023
PETERS WILLIAM J CFO, EVP & Treasurer
Sold on a plan 3×
$3.30M 59,250 at 55.67
36.9%
Planned (10b5-1)
Showing 1–50 of 341. Page 1 of 7 Older →