Insider trading

Period: 120 months Stock: SION + 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.

88 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.

88 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.

88 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.

88 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.
88 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
88 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.

88 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
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)
14 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 2×
$18.15K 606 at 29.95
0.1%
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)
10 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 2×
$606.74K 20,238 at 29.98
2.5%
Planned (10b5-1)
6 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 2×
$353.41K 11,800 at 29.95
1.5%
Planned (10b5-1)
3 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 2×
$1.13M 37,746 at 30.00
4.6%
Planned (10b5-1)
1 Oct 2025
Booth Bruce Director · indirect
Sold on a plan 2×
$5.99K 200 at 29.95
0.0%
Planned (10b5-1)
30 Sep 2025
Booth Bruce Director · indirect
Sold on a plan 2×
$372.38K 12,388 at 30.06
1.5%
Planned (10b5-1)
29 Sep 2025
Booth Bruce Director · indirect
Sold on a plan 2×
$1.99M 66,105 at 30.09
7.7%
Planned (10b5-1)
29 Sep 2025
Cloonan Michael President & CEO
Sold on a plan
$231.45K 7,793 at 29.70
1.4%
Planned (10b5-1)
26 Sep 2025
Cloonan Michael President & CEO
Sold on a plan
$496.35K 17,207 at 28.85
3.0%
Planned (10b5-1)
4 Sep 2025
Fitzpatrick Jennifer Chief Legal Officer
Sold on a plan
$236.98K 10,250 at 23.12
100%
Sold half or more
2 Sep 2025
Ridloff Elena CFO & Head of Corp. Dev.
Sold on a plan
$221.61K 8,836 at 25.08
18.7%
Planned (10b5-1)
29 Aug 2025
Ridloff Elena CFO & Head of Corp. Dev.
Sold on a plan
$18.83K 748 at 25.18
1.6%
Planned (10b5-1)
28 Aug 2025
Ridloff Elena CFO & Head of Corp. Dev.
Sold on a plan
$418.07K 16,098 at 25.97
25.1%
Planned (10b5-1)
27 Aug 2025
Cloonan Michael President & CEO
Sold on a plan
$185.71K 7,426 at 25.01
1.3%
Planned (10b5-1)
27 Aug 2025
Ridloff Elena CFO & Head of Corp. Dev.
Sold on a plan
$90.81K 3,618 at 25.10
5.3%
Planned (10b5-1)
26 Aug 2025
Cloonan Michael President & CEO
Sold on a plan
$438.65K 17,574 at 24.96
3.1%
Planned (10b5-1)
26 Aug 2025
Ridloff Elena CFO & Head of Corp. Dev.
Sold on a plan
$92.98K 3,700 at 25.13
5.2%
Planned (10b5-1)
20 Aug 2025
Cloonan Michael President & CEO
Sold on a plan
$568.75K 25,000 at 22.75
4.4%
Planned (10b5-1)
20 Aug 2025
Ridloff Elena CFO & Head of Corp. Dev.
Sold on a plan
$397.08K 17,500 at 22.69
19.7%
Planned (10b5-1)
19 Aug 2025
Ridloff Elena CFO & Head of Corp. Dev.
Sold on a plan
$727.26K 34,500 at 21.08
27.9%
Planned (10b5-1)
27 Jun 2025
TPG GP A, LLC 10% owner · indirect
Bought
$950.40K 60,000 at 15.84
0.9%
10 Feb 2025
TPG GP A, LLC 10% owner · indirect
Bought
$20.25M 1,125,000 at 18.00
20.2%
First buy on file
10 Feb 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Bought 2×
$20.25M 1,125,000 at 18.00
19.4%
First buy on file
10 Feb 2025
Thompson Peter A. Director · indirect
Bought
$9.90M 550,000 at 18.00
17.4%
First buy on file
10 Feb 2025
ORBIMED ADVISORS LLC Director · indirect
Bought
$9.90M 550,000 at 18.00
17.4%
First buy on file
10 Feb 2025
Atlas Venture Fund XI, L.P. 10% owner · indirect
Bought
$1.08M 60,000 at 18.00
8.0%
First buy on file
10 Feb 2025
Booth Bruce Director · indirect
Bought
$1.08M 60,000 at 18.00
8.0%
First buy on file
Showing 51–88 of 88. ← Newer Page 2 of 2