Insider trading

Period: 120 months Stock: ATEC Role: Directors × + 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.

61 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.

61 decisions over 120 months Remove this filter
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.

61 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.

61 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.
61 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
61 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.

61 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
11 Jun 2026
MCGINNIS KAREN K Director
Sold on a plan
$48.46K 6,050 at 8.01
6.0%
Planned (10b5-1)
11 May 2026
Valentine Keith Director
Bought
$245.00K 35,000 at 7.00
17.7%
8 May 2026
Valentine Keith Director
Bought
$330.61K 43,847 at 7.54
28.6%
+29% of stake
7 May 2026
Valentine Keith Director
Bought
$420.59K 56,153 at 7.49
57.7%
Largest buy in 3 yrs
16 Dec 2025
Pelizzon David R Director · indirect
Sold at will
$4.92M 250,000 at 19.66
2.3%
Not planned
11 Dec 2025
Demski David M Director
Sold at will
$636.00K 30,000 at 21.20
7.0%
Not planned
9 Dec 2025
Pelizzon David R Director · indirect
Sold at will
$606.38K 28,834 at 21.03
0.3%
Not planned
8 Dec 2025
Pelizzon David R Director · indirect
Sold at will
$4.69M 221,166 at 21.20
2.0%
Not planned
24 Nov 2025
Pelizzon David R Director · indirect
Sold at will
$5.16M 250,000 at 20.62
2.2%
Not planned
12 Nov 2025
Pelizzon David R Director · indirect
Sold at will
$5.20M 250,000 at 20.80
2.2%
Not planned
3 Nov 2025
Rydin Jeffrey P Director
Sold at will
$3.86M 200,000 at 19.32
34.2%
Not planned
9 Sep 2025
Sold at will
$998.13K 62,500 at 15.97
9.2%
Not planned
11 Jun 2025
MCGINNIS KAREN K Director
Sold on a plan
$47.99K 3,963 at 12.11
5.5%
Planned (10b5-1)
3 Mar 2025
MCGINNIS KAREN K Director
Sold on a plan
$469.80K 38,320 at 12.26
40.0%
Planned (10b5-1)
23 Aug 2024
Bakst Evan Director · indirect
Bought
$201.60K 35,000 at 5.76
233%
+233% of stake
23 Aug 2024
Pelizzon David R Director
Bought
$100.00K 16,978 at 5.89
5.4%
Largest buy in 3 yrs
22 Aug 2024
Pelizzon David R Director
Bought
$50.00K 8,818 at 5.67
2.9%
21 Aug 2024
Demski David M Director
Bought
$283.50K 50,000 at 5.67
21.0%
+21% of stake
2 Aug 2024
Demski David M Director
Bought
$262.40K 40,000 at 6.56
20.2%
+20% of stake
2 Aug 2024
Valentine Keith Director
Bought
$255.45K 39,000 at 6.55
90.4%
First buy on file
14 Mar 2024
Bakst Evan Director · indirect
Bought
$202.95K 15,000 at 13.53
opened
Largest buy in 3 yrs
7 Mar 2024
Bought
$256.60K 20,000 at 12.83
3.6%
First buy on file
9 Nov 2023
Demski David M Director
Bought
$315.00K 30,000 at 10.50
19.8%
First buy on file
11 Sep 2023
TULLIS JAMES L L Director · indirect
Sold at will
$1.03M 70,000 at 14.74
11.0%
Not planned
11 Sep 2023
TULLIS JAMES L L Director
Sold at will
$515.90K 35,000 at 14.74
16.9%
Not planned
11 Sep 2023
Mowry David H Director
Sold at will
$137.37K 9,500 at 14.46
9.3%
Not planned
23 Aug 2023
Bakst Evan Director
Sold on a plan
$129.80K 8,700 at 14.92
0.8%
Planned (10b5-1)
16 Jun 2023
Sold on a plan
$149.67K 9,273 at 16.14
22.9%
Planned (10b5-1)
12 Jun 2023
Segal Paul Director
Sold at will 2×
$2.16M 142,658 at 15.15
58.8%
Sold half or more
13 Mar 2023
Pelizzon David R Director
Bought
$47.24K 3,100 at 15.24
1.1%
8 Mar 2023
TULLIS JAMES L L Director · indirect
Sold, plan not stated
$483.60K 30,000 at 16.12
6.0%
16 Dec 2022
TULLIS JAMES L L Director · indirect
Sold, plan not stated
$529.50K 50,000 at 10.59
9.1%
29 Aug 2022
Mowry David H Director
Sold, plan not stated
$34.30K 4,370 at 7.85
4.5%
17 Aug 2022
Sold, plan not stated
$72.56K 8,009 at 9.06
16.5%
15 Jun 2022
TULLIS JAMES L L Director
Bought
$50.70K 7,500 at 6.76
4.2%
First buy on file
9 Jun 2022
Bought
$115.20K 16,000 at 7.20
3.0%
First buy on file
7 Apr 2022
TULLIS JAMES L L Director · indirect
Sold, plan not stated 2×
$879.29K 67,690 at 12.99
11.0%
7 Apr 2022
TULLIS JAMES L L Director
Sold, plan not stated
$21.17K 1,630 at 12.99
1.0%
15 Dec 2021
Hochberg Jason Director
Bought
$54.20K 5,000 at 10.84
6.3%
Largest buy in 3 yrs
10 Dec 2021
TULLIS JAMES L L Director · indirect
Sold, plan not stated
$640.75K 55,000 at 11.65
10.5%
9 Dec 2021
TULLIS JAMES L L Director · indirect
Sold, plan not stated
$235.60K 20,000 at 11.78
3.7%
26 Nov 2021
Bakst Evan Director
Bought
$105.70K 10,000 at 10.57
1.3%
First buy on file
23 Nov 2021
Hochberg Jason Director
Bought
$54.15K 5,000 at 10.83
6.7%
First buy on file
16 Nov 2021
Mowry David H Director
Sold, plan not stated
$174.61K 14,254 at 12.25
15.5%
11 Nov 2021
Pelizzon David R Director
Bought
$49.82K 4,366 at 11.41
1.5%
8 Nov 2021
Pelizzon David R Director
Bought
$70.53K 5,425 at 13.00
1.9%
10 May 2021
Pelizzon David R Director
Bought
$1.83M 120,000 at 15.25
80.6%
+81% of stake
9 Mar 2021
TULLIS JAMES L L Director · indirect
Sold, plan not stated
$365.40K 22,500 at 16.24
4.0%
8 Mar 2021
Pelizzon David R Director
Bought 2×
$73.12K 4,698 at 15.56
3.3%
1 Mar 2021
Pelizzon David R Director · indirect
Bought
$90.00M 8,100,810 at 11.11
246%
First buy on file
Showing 1–50 of 61. Page 1 of 2 Older →