Insider trading

Period: 120 months Stock: AMPH Minimum amount: $100K × + Add filter Clear all
Views & alerts

Save your view. Keep the filter you have built, and get an email when a new filing matches it. A free account does both.

When

Period

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

222 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.

222 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.

222 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.

222 decisions over 120 months Remove this filter
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.
222 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
222 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.

222 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
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
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
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
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
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)
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
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)
14 Nov 2023
Deflin Gayle Director
Sold at will
$230.84K 4,163 at 55.45
60.5%
Sold half or more
13 Nov 2023
PRINS RICHARD K Director
Sold at will
$262.50K 5,000 at 52.50
12.2%
Not planned
6 Sep 2023
PETERS WILLIAM J CFO, EVP & Treasurer
Sold on a plan 2×
$3.14M 60,743 at 51.75
37.5%
Planned (10b5-1)
28 Aug 2023
Liawatidewi Yakob EVP Corp Admin Center
Sold at will
$1.53M 28,816 at 53.13
29.3%
Not planned
18 Aug 2023
PRINS RICHARD K Director
Sold at will
$105.01K 2,000 at 52.50
4.7%
Not planned
15 Aug 2023
Sold at will
$730.03K 12,759 at 57.22
27.4%
Not planned
15 Aug 2023
PRINS RICHARD K Director
Sold at will
$238.91K 4,163 at 57.39
8.8%
Not planned
15 Jun 2023
PETERS WILLIAM J CFO, EVP & Treasurer
Sold on a plan 3×
$1.87M 36,868 at 50.85
25.9%
Planned (10b5-1)
15 Jun 2023
Zhou Rong EVP, Production Center
Sold at will
$258.95K 5,000 at 51.79
4.9%
Not planned
13 Jun 2023
Zhou Rong EVP, Production Center
Sold at will
$241.20K 5,000 at 48.24
5.4%
Not planned
2 Jun 2023
PETERS WILLIAM J CFO, EVP & Treasurer
Sold on a plan
$509.86K 11,000 at 46.35
9.4%
Planned (10b5-1)
1 Jun 2023
Lee Howard Director
Sold at will
$750.96K 16,679 at 45.02
10.4%
Not planned
18 May 2023
PETERS WILLIAM J CFO, EVP & Treasurer
Sold on a plan
$465.68K 10,500 at 44.35
9.1%
Planned (10b5-1)
18 May 2023
Zhou Rong EVP, Production Center
Sold at will
$442.05K 10,000 at 44.21
10.2%
Not planned
18 May 2023
Deflin Gayle Director
Sold at will
$198.89K 4,519 at 44.01
52.1%
Sold half or more
17 May 2023
Sold at will
$215.66K 5,000 at 43.13
5.9%
Not planned
15 May 2023
Sold at will
$316.34K 7,500 at 42.18
14.6%
Not planned
15 May 2023
PRINS RICHARD K Director
Sold at will
$217.50K 5,000 at 43.50
10.1%
Not planned
12 May 2023
PRINS RICHARD K Director
Sold at will
$210.32K 5,000 at 42.06
9.6%
Not planned
Showing 1–50 of 222. Page 1 of 5 Older →