Insider trading

Period: 120 months Stock: AMPH + 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.

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
1 Jun 2022
Sold, plan not stated 2×
$18.50K 500 at 37.00
0.6%
23 May 2022
Lee Howard Director
Sold, plan not stated
$349.32K 10,000 at 34.93
6.7%
20 May 2022
Zhang Jack Y. CEO & Chief Scientific Officer
Sold, plan not stated
$364.37K 10,650 at 34.21
0.5%
19 May 2022
Zhang Jack Y. CEO & Chief Scientific Officer
Sold, plan not stated 2×
$1.41M 41,730 at 33.76
1.9%
18 May 2022
Zhang Jack Y. CEO & Chief Scientific Officer
Sold, plan not stated 3×
$2.29M 67,046 at 34.14
3.0%
18 May 2022
Sold, plan not stated
$347.83K 9,924 at 35.05
10.3%
17 May 2022
Zhang Jack Y. CEO & Chief Scientific Officer
Sold, plan not stated 2×
$1.80M 50,376 at 35.76
2.2%
16 May 2022
Zhang Jack Y. CEO & Chief Scientific Officer
Sold, plan not stated 2×
$2.43M 68,069 at 35.75
2.9%
16 May 2022
Sold, plan not stated
$366.50K 10,291 at 35.61
17.9%
2 May 2022
Sold, plan not stated 2×
$10.38K 295 at 35.18
0.4%
1 Apr 2022
Sold, plan not stated 2×
$18.34K 500 at 36.69
0.7%
16 Mar 2022
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated 2×
$1.72M 50,777 at 33.96
30.8%
16 Mar 2022
Sold, plan not stated
$337.07K 10,000 at 33.71
17.5%
15 Mar 2022
PRINS RICHARD K Director
Sold, plan not stated
$340.21K 10,000 at 34.02
18.1%
15 Mar 2022
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$272.25K 7,900 at 34.46
7.4%
7 Mar 2022
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$382.31K 13,026 at 29.35
10.9%
1 Mar 2022
Sold, plan not stated
$13.64K 500 at 27.27
0.6%
25 Feb 2022
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated 2×
$654.85K 23,000 at 28.47
17.8%
25 Feb 2022
Zhou Rong EVP, Production Center
Sold, plan not stated
$381.09K 13,246 at 28.77
15.9%
8 Feb 2022
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$269.50K 10,000 at 26.95
8.6%
8 Feb 2022
Zhou Rong EVP, Production Center
Sold, plan not stated
$187.39K 7,000 at 26.77
8.4%
1 Feb 2022
Sold, plan not stated 2×
$12.04K 500 at 24.08
0.6%
10 Jan 2022
Zhou Rong EVP, Production Center
Sold, plan not stated 2×
$530.68K 20,928 at 25.36
21.5%
10 Jan 2022
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$406.40K 16,000 at 25.40
13.1%
7 Jan 2022
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated 2×
$776.22K 31,776 at 24.43
23.1%
3 Jan 2022
Sold, plan not stated
$11.61K 500 at 23.22
0.6%
30 Dec 2021
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$234.00K 10,000 at 23.40
8.6%
22 Dec 2021
Sold, plan not stated
$22.50K 1,000 at 22.50
1.3%
21 Dec 2021
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$184.93K 8,256 at 22.40
7.2%
16 Dec 2021
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$39.07K 1,744 at 22.40
1.6%
10 Dec 2021
PRINS RICHARD K Director
Sold, plan not stated
$113.01K 5,291 at 21.36
10.5%
22 Nov 2021
PRINS RICHARD K Director
Sold, plan not stated
$106.10K 5,000 at 21.22
10.0%
11 Nov 2021
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$213.30K 10,000 at 21.33
8.6%
11 Nov 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$169.31K 7,813 at 21.67
8.6%
16 Aug 2021
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$127.52K 6,589 at 19.35
5.9%
2 Aug 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$193.73K 9,123 at 21.24
9.9%
2 Aug 2021
Liawatidewi Yakob EVP Corp Admin Center
Sold, plan not stated
$188.80K 8,932 at 21.14
14.2%
26 Jul 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$125.22K 6,000 at 20.87
6.5%
20 Jul 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$106.70K 5,187 at 20.57
5.7%
15 Jul 2021
Liawatidewi Yakob EVP Corp Admin Center
Sold, plan not stated
$630.69K 31,524 at 20.01
36.8%
7 Jul 2021
PETERS WILLIAM J CFO, EVP & Treasurer
Sold, plan not stated
$203.74K 10,000 at 20.37
8.2%
9 Jun 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$92.65K 4,732 at 19.58
5.2%
8 Jun 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$158.18K 8,180 at 19.34
8.2%
8 Jun 2021
Lee Howard Director
Sold, plan not stated
$154.51K 8,000 at 19.31
5.4%
7 Jun 2021
Sold, plan not stated
$306.04K 15,827 at 19.34
17.7%
7 Jun 2021
Lee Howard Director
Sold, plan not stated
$150.94K 7,827 at 19.28
5.6%
7 Jun 2021
PRINS RICHARD K Director
Sold, plan not stated
$93.50K 5,000 at 18.70
11.3%
4 Jun 2021
PRINS RICHARD K Director
Sold, plan not stated
$93.85K 5,000 at 18.77
11.3%
3 Jun 2021
Sold, plan not stated
$186.53K 10,000 at 18.65
12.0%
1 Jun 2021
Koo Richard Director
Sold, plan not stated
$498.01K 25,827 at 19.28
9.3%
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