Insider trading

Period: 120 months Stock: MLYS Plan: Not on a plan × + 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.

32 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.

32 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.

32 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.

32 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.
32 decisions over 120 months Remove this filter
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
32 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.

32 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
22 Sep 2026
Slingsby Brian Taylor Director · indirect
Sold at will
$3.01M 104,320 at 28.81
1.3%
Not planned
30 Mar 2026
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Bought
$1.41M 58,300 at 24.16
1.0%
27 Mar 2026
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Bought
$7.35M 310,700 at 23.67
5.7%
20 Nov 2025
Slingsby Brian Taylor Director · indirect
Sold at will
$43.35M 1,000,000 at 43.35
11.2%
Not planned
13 Nov 2025
Karydas Daphne Director
Sold at will 2×
$689.80K 15,000 at 45.99
100%
Sold half or more
13 Nov 2025
Gold Alexander M Director
Sold at will
$592.50K 12,742 at 46.50
100%
Sold half or more
12 Nov 2025
Gold Alexander M Director
Sold at will 2×
$323.89K 6,933 at 46.72
100%
Sold half or more
11 Nov 2025
Congleton Jon Chief Executive Officer
Sold at will 6×
$9.09M 200,000 at 45.44
24.1%
Not planned
11 Nov 2025
Levy Adam Scott CFO and Secretary
Sold at will 9×
$5.36M 119,524 at 44.88
86.0%
Sold half or more
11 Nov 2025
Gold Alexander M Director
Sold at will 2×
$659.71K 15,000 at 43.98
100%
Sold half or more
4 Sep 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Bought
$30.00M 1,176,470 at 25.50
27.5%
Largest buy in 3 yrs
4 Sep 2025
AKKARAJU SRINIVAS Director · indirect
Bought
$15.00M 588,235 at 25.50
opened
30 Jul 2025
Levy Adam Scott CFO and Secretary
Sold at will 2×
$884.37K 59,925 at 14.76
31.1%
Not planned
29 Jul 2025
Levy Adam Scott CFO and Secretary
Sold at will
$11.30K 807 at 14.00
0.4%
Not planned
28 Jul 2025
Levy Adam Scott CFO and Secretary
Sold at will
$181.80K 12,946 at 14.04
6.3%
Not planned
13 Mar 2025
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Bought
$17.50M 1,296,296 at 13.50
43.4%
+43% of stake
13 Mar 2025
AKKARAJU SRINIVAS Director · indirect
Bought
$8.10M 600,000 at 13.50
11.8%
13 Mar 2025
Samsara BioCapital GP, LLC 10% owner · indirect
Bought
$8.10M 600,000 at 13.50
11.8%
Largest buy in 3 yrs
13 Mar 2025
Slingsby Brian Taylor Director · indirect
Bought
$3.50M 259,259 at 13.50
3.0%
24 Jul 2024
Slingsby Brian Taylor Director · indirect
Sold at will
$7.18M 550,000 at 13.05
6.0%
Not planned
12 Feb 2024
Samsara BioCapital GP, LLC 10% owner · indirect
Bought
$7.50M 555,555 at 13.50
12.3%
First buy on file
22 Nov 2023
Congleton Jon Chief Executive Officer
Bought
$25.36K 4,250 at 5.97
0.4%
6 Sep 2023
Congleton Jon Chief Executive Officer
Bought
$27.18K 2,250 at 12.08
0.2%
17 Aug 2023
Congleton Jon Chief Executive Officer
Bought
$27.23K 2,250 at 12.10
0.2%
Largest buy in 3 yrs
11 Aug 2023
Rodman David Malcom Chief Medical Officer
Sold at will 2×
$2.01M 157,091 at 12.81
100%
Sold half or more
11 Aug 2023
Congleton Jon Chief Executive Officer
Bought
$25.78K 2,000 at 12.89
0.2%
First buy on file
10 Aug 2023
Rodman David Malcom Chief Medical Officer
Sold at will
$982.07K 74,625 at 13.16
100%
Sold half or more
14 Feb 2023
RA CAPITAL MANAGEMENT, L.P. Director · indirect
Bought 2×
$20.00M 1,250,000 at 16.00
203%
First buy on file
14 Feb 2023
AKKARAJU SRINIVAS Director · indirect
Bought
$15.00M 937,500 at 16.00
26.2%
First buy on file
14 Feb 2023
Bought
$5.00M 312,500 at 16.00
10.8%
First buy on file
14 Feb 2023
Slingsby Brian Taylor Director · indirect
Bought
$4.00M 250,000 at 16.00
2.8%
First buy on file
14 Feb 2023
Levy Adam Scott CFO, Chief Bus. Off. and Secy.
Bought
$100.00K 6,250 at 16.00
1.8%
First buy on file
Showing 1–32 of 32.