Insider trading

Period: 12 months Stock: SION Minimum amount: $100K × + 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.

49 decisions over 12 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.

49 decisions over 12 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.

49 decisions over 12 months
The trade

Minimum amount

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

49 decisions over 12 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.
49 decisions over 12 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
49 decisions over 12 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.

49 decisions over 12 months
Stock
Insider
Type ?
Why it stands out
17 Sep 2026
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 2×
$21.84M 3,448,811 at 6.33
50.0%
Sold half or more
7 Jul 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$3.85M 85,918 at 44.86
3.4%
Planned (10b5-1)
7 Jul 2026
Thompson Peter A. Director · indirect
Sold on a plan
$3.85M 85,918 at 44.86
3.4%
Planned (10b5-1)
6 Jul 2026
Fitzpatrick Jennifer Chief Legal Officer
Sold on a plan
$446.86K 10,250 at 43.60
100%
Sold half or more
30 Jun 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$5.27M 115,844 at 45.50
4.3%
Planned (10b5-1)
30 Jun 2026
Thompson Peter A. Director · indirect
Sold on a plan
$5.27M 115,844 at 45.50
4.3%
Planned (10b5-1)
11 May 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$8.53M 184,639 at 46.22
6.5%
Planned (10b5-1)
11 May 2026
Thompson Peter A. Director · indirect
Sold on a plan
$8.53M 184,639 at 46.22
6.5%
Planned (10b5-1)
8 May 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$2.66M 59,767 at 44.58
2.0%
Planned (10b5-1)
8 May 2026
Thompson Peter A. Director · indirect
Sold on a plan
$2.66M 59,767 at 44.58
2.0%
Planned (10b5-1)
7 May 2026
Thompson Peter A. Director · indirect
Sold on a plan
$2.17M 48,546 at 44.61
1.6%
Planned (10b5-1)
7 May 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$2.17M 48,546 at 44.61
1.6%
Planned (10b5-1)
18 Apr 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$131.24K 2,948 at 44.52
0.1%
Planned (10b5-1)
18 Apr 2026
Thompson Peter A. Director · indirect
Sold on a plan
$131.24K 2,948 at 44.52
0.1%
Planned (10b5-1)
17 Apr 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$2.34M 52,397 at 44.68
1.7%
Planned (10b5-1)
17 Apr 2026
Thompson Peter A. Director · indirect
Sold on a plan
$2.34M 52,397 at 44.68
1.7%
Planned (10b5-1)
16 Apr 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$10.29M 226,906 at 45.34
7.0%
Planned (10b5-1)
16 Apr 2026
Thompson Peter A. Director · indirect
Sold on a plan
$10.29M 226,906 at 45.34
7.0%
Planned (10b5-1)
15 Apr 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$10.53M 235,863 at 44.64
6.8%
Planned (10b5-1)
15 Apr 2026
Thompson Peter A. Director · indirect
Sold on a plan
$10.53M 235,863 at 44.64
6.8%
Planned (10b5-1)
14 Apr 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$2.13M 47,814 at 44.51
1.4%
Planned (10b5-1)
14 Apr 2026
Thompson Peter A. Director · indirect
Sold on a plan
$2.13M 47,814 at 44.51
1.4%
Planned (10b5-1)
5 Mar 2026
Fitzpatrick Jennifer Chief Legal Officer
Sold on a plan
$347.02K 10,250 at 33.86
100%
Sold half or more
3 Feb 2026
Thompson Peter A. Director · indirect
Sold on a plan
$1.30M 29,063 at 44.58
0.8%
Planned (10b5-1)
3 Feb 2026
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$1.30M 29,063 at 44.58
0.8%
Planned (10b5-1)
22 Jan 2026
TPG GP A, LLC 10% owner · indirect
Sold at will
$10.00M 250,000 at 40.00
3.7%
Not planned
24 Dec 2025
Thompson Peter A. Director · indirect
Sold on a plan
$1.49M 33,356 at 44.55
0.9%
Planned (10b5-1)
24 Dec 2025
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$1.49M 33,356 at 44.55
0.9%
Planned (10b5-1)
5 Dec 2025
Fitzpatrick Jennifer Chief Legal Officer
Sold on a plan
$415.33K 10,250 at 40.52
100%
Sold half or more
25 Nov 2025
Thompson Peter A. Director · indirect
Sold on a plan
$530.29K 11,890 at 44.60
0.3%
Planned (10b5-1)
25 Nov 2025
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$530.29K 11,890 at 44.60
0.3%
Planned (10b5-1)
24 Nov 2025
Thompson Peter A. Director · indirect
Sold on a plan
$4.21M 94,583 at 44.54
2.6%
Planned (10b5-1)
24 Nov 2025
ORBIMED ADVISORS LLC Director · indirect
Sold on a plan
$4.21M 94,583 at 44.54
2.6%
Planned (10b5-1)
21 Nov 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 4×
$994.73K 25,183 at 39.50
13.7%
Not planned
20 Nov 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 8×
$205.98K 5,133 at 40.13
3.0%
Not planned
19 Nov 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 8×
$1.90M 47,442 at 40.01
22.0%
Not planned
18 Nov 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 4×
$273.90K 6,922 at 39.57
3.7%
Not planned
17 Nov 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 12×
$3.33M 81,987 at 40.59
30.8%
Not planned
28 Oct 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 4×
$2.48M 62,610 at 39.58
23.0%
Not planned
24 Oct 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Sold at will 4×
$12.28M 311,000 at 39.50
58.6%
Sold half or more
21 Oct 2025
Cloonan Michael President & CEO
Sold on a plan 4×
$3.62M 99,800 at 36.26
15.4%
Planned (10b5-1)
21 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 10×
$3.04M 88,878 at 34.22
11.5%
Planned (10b5-1)
20 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 4×
$1.80M 55,985 at 32.09
7.4%
Planned (10b5-1)
17 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 6×
$1.98M 61,124 at 32.37
7.9%
Planned (10b5-1)
16 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 8×
$5.48M 169,260 at 32.35
19.0%
Planned (10b5-1)
16 Oct 2025
Cloonan Michael President & CEO
Sold on a plan 2×
$328.49K 10,425 at 31.51
1.9%
Planned (10b5-1)
15 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 4×
$3.55M 115,856 at 30.61
13.4%
Planned (10b5-1)
15 Oct 2025
Cloonan Michael President & CEO
Sold on a plan
$459.66K 14,775 at 31.11
2.6%
Planned (10b5-1)
13 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 4×
$1.77M 58,232 at 30.38
7.0%
Planned (10b5-1)
Showing 1–49 of 49.