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
20 May 2021
Lee Howard Director
Sold, plan not stated
$197.35K 10,000 at 19.74
7.0%
17 May 2021
Liawatidewi Yakob SVP Corp Admin Center
Sold, plan not stated
$192.69K 9,637 at 19.99
15.2%
14 May 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$343.46K 17,419 at 19.72
16.2%
14 May 2021
Liawatidewi Yakob SVP Corp Admin Center
Sold, plan not stated
$63.45K 3,186 at 19.92
5.6%
13 May 2021
Sold, plan not stated
$499.43K 25,827 at 19.34
38.5%
13 May 2021
Zhou Rong EVP, Production Center
Sold, plan not stated
$13.71K 700 at 19.58
0.7%
12 May 2021
Liawatidewi Yakob EVP Corp Admin Center
Sold, plan not stated
$88.74K 4,592 at 19.33
7.5%
11 May 2021
PRINS RICHARD K Director
Sold, plan not stated
$299.11K 15,827 at 18.90
28.8%
11 May 2021
Liawatidewi Yakob EVP Corp Admin Center
Sold, plan not stated
$190.60K 10,000 at 19.06
14.0%
15 Mar 2021
PETERS WILLIAM J CFO, SVP & Treasurer
Sold, plan not stated
$80.75K 4,244 at 19.03
4.7%
18 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$7.56K 407 at 18.58
0.0%
17 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$257.72K 13,801 at 18.67
0.2%
16 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$301.03K 16,259 at 18.51
0.2%
12 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$251.52K 13,277 at 18.94
0.2%
11 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$377.88K 19,823 at 19.06
0.3%
10 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$295.34K 15,747 at 18.76
0.2%
9 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$225.78K 11,927 at 18.93
0.2%
8 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$254.05K 13,452 at 18.89
0.2%
5 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$293.72K 15,507 at 18.94
0.2%
4 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$483.02K 25,570 at 18.89
0.4%
3 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$299.32K 16,299 at 18.36
0.2%
2 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$257.82K 13,817 at 18.66
0.2%
1 Feb 2021
Zhang Jack Y. CEO & Chief Scientific Officer · indirect
Sold, plan not stated
$441.12K 24,114 at 18.29
0.3%
1 Feb 2021
Sold, plan not stated
$11.67K 639 at 18.26
0.9%
19 Jan 2021
PETERS WILLIAM J CFO, SVP & Treasurer
Sold, plan not stated
$121.24K 6,495 at 18.67
6.8%
1 Dec 2020
Sold, plan not stated
$8.94K 500 at 17.87
0.7%
2 Nov 2020
Sold, plan not stated
$9.92K 500 at 19.84
0.7%
1 Oct 2020
Sold, plan not stated
$9.45K 500 at 18.89
0.7%
1 Sep 2020
Sold, plan not stated
$9.95K 500 at 19.90
0.7%
14 Aug 2020
PETERS WILLIAM J CFO, SVP & Treasurer
Sold, plan not stated
$112.22K 5,512 at 20.36
5.4%
14 Aug 2020
Maris David Director
Bought
$20.26K 1,000 at 20.26
8.2%
First buy on file
11 Aug 2020
PRINS RICHARD K Director
Sold, plan not stated
$121.98K 6,000 at 20.33
13.3%
3 Aug 2020
Sold, plan not stated
$10.31K 500 at 20.62
0.7%
21 Jul 2020
Liawatidewi Yakob EVP Corp Admin Center
Sold, plan not stated
$126.84K 5,978 at 21.22
11.5%
20 Jul 2020
Liawatidewi Yakob EVP Corp Admin Center
Sold, plan not stated
$88.05K 4,186 at 21.03
8.3%
6 Jul 2020
PETERS WILLIAM J CFO, SVP & Treasurer
Sold, plan not stated
$300.40K 13,656 at 22.00
11.9%
1 Jul 2020
Sold, plan not stated
$11.14K 500 at 22.27
0.6%
9 Jun 2020
Liawatidewi Yakob EVP Corp Admin Center
Sold, plan not stated
$477.60K 23,405 at 20.41
33.7%
4 Jun 2020
Zhou Rong EVP, Production Center
Sold, plan not stated
$188.18K 9,806 at 19.19
11.0%
3 Jun 2020
Zhou Rong EVP, Production Center
Sold, plan not stated
$247.68K 13,163 at 18.82
14.1%
1 Jun 2020
Sold, plan not stated
$9.48K 500 at 18.97
0.7%
27 May 2020
Koo Richard Director
Sold, plan not stated
$868.89K 47,782 at 18.18
16.2%
26 May 2020
Lee Howard Director
Sold, plan not stated
$185.99K 10,000 at 18.60
7.2%
22 May 2020
Lee Howard Director
Sold, plan not stated
$183.64K 10,000 at 18.36
7.2%
21 May 2020
Lee Howard Director
Sold, plan not stated
$184.69K 10,000 at 18.47
7.2%
20 May 2020
Lee Howard Director
Sold, plan not stated
$327.78K 17,782 at 18.43
12.2%
15 May 2020
Sold, plan not stated
$778.97K 42,682 at 18.25
37.3%
15 May 2020
Sold, plan not stated
$413.68K 22,950 at 18.03
39.4%
14 May 2020
Sold, plan not stated
$266.98K 14,832 at 18.00
29.6%
14 May 2020
Sold, plan not stated
$88.88K 5,000 at 17.78
6.5%
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