Insider trading

Period: 120 months Stock: BLFS Minimum amount: $1M × + Add filter Clear all
Views & alerts

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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.

57 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.

57 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.

57 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.

57 decisions over 120 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.
57 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
57 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.

57 decisions over 120 months
Stock
Insider
Type ?
Why it stands out
21 May 2026
Casdin Partners Master Fund, L.P. 10% owner · indirect
Sold at will
$15.41M 650,000 at 23.70
12.0%
Not planned
20 May 2026
Casdin Partners Master Fund, L.P. 10% owner · indirect
Sold at will
$5.93M 250,000 at 23.70
4.4%
Not planned
19 May 2026
Casdin Partners Master Fund, L.P. 10% owner · indirect
Sold at will
$6.80M 300,000 at 22.65
5.0%
Not planned
5 Mar 2026
Foster Karen A. Chief Quality and Operations
Sold at will
$1.95M 96,923 at 20.15
46.0%
Not planned
22 Oct 2025
DE GREEF RODERICK President and CEO
Sold on a plan
$1.03M 37,795 at 27.30
7.2%
Planned (10b5-1)
15 Oct 2025
Casdin Partners Master Fund, L.P. 10% owner · indirect
Sold at will
$21.41M 750,000 at 28.55
11.2%
Not planned
15 Aug 2025
Casdin Partners Master Fund, L.P. 10% owner · indirect
Sold at will
$12.20M 500,000 at 24.40
6.9%
Not planned
11 Aug 2025
Casdin Partners Master Fund, L.P. 10% owner · indirect
Sold at will
$11.30M 500,000 at 22.60
6.5%
Not planned
10 Jun 2025
Casdin Partners Master Fund, L.P. 10% owner · indirect
Sold at will
$23.80M 1,000,000 at 23.80
11.5%
Not planned
31 Oct 2024
DE GREEF RODERICK President and CEO
Sold on a plan
$1.10M 46,896 at 23.43
10.2%
Planned (10b5-1)
19 Oct 2023
Bought
$10.37M 927,165 at 11.19
12.2%
19 May 2023
Casdin Partners Master Fund, L.P. 10% owner · indirect
Bought
$1.13M 50,000 at 22.55
66.6%
+67% of stake
5 Feb 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.64M 40,000 at 40.90
1.2%
25 Jan 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$2.08M 50,000 at 41.58
1.5%
22 Jan 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.27M 29,811 at 42.48
0.9%
20 Jan 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.20M 29,182 at 41.03
0.8%
19 Jan 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.61M 40,000 at 40.30
1.1%
15 Jan 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.19M 29,338 at 40.62
0.8%
11 Jan 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated 3×
$3.22M 80,000 at 40.24
2.2%
7 Jan 2021
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.19M 30,000 at 39.55
0.8%
24 Nov 2020
Bought
$36.00M 1,600,000 at 22.50
27.4%
First buy on file
24 Nov 2020
GIRSCHWEILER THOMAS Director · indirect
Sold, plan not stated
$36.00M 1,600,000 at 22.50
97.1%
Sold half or more
19 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.23M 36,848 at 33.35
1.0%
18 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.29M 40,000 at 32.33
1.1%
17 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.25M 40,000 at 31.31
1.1%
16 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.17M 36,957 at 31.68
1.0%
13 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.54M 48,306 at 31.97
1.2%
12 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.07M 32,596 at 32.84
0.8%
11 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.65M 50,000 at 32.98
1.3%
10 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.60M 50,000 at 32.00
1.2%
5 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated 2×
$4.35M 134,480 at 32.33
3.2%
4 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$2.32M 75,000 at 30.99
1.8%
3 Nov 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.53M 50,000 at 30.68
1.2%
30 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.92M 65,086 at 29.51
1.5%
29 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated 2×
$2.93M 100,000 at 29.34
2.3%
28 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated 2×
$2.91M 100,000 at 29.14
2.2%
27 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.49M 50,000 at 29.85
1.1%
26 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.42M 50,000 at 28.45
1.1%
23 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.04M 35,883 at 28.99
0.8%
22 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.33M 46,304 at 28.65
1.0%
21 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.27M 44,697 at 28.42
0.9%
7 Oct 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.38M 46,542 at 29.69
1.0%
10 Aug 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.08M 50,000 at 21.63
1.0%
7 Aug 2020
VILLIGER WALTER 10% owner · indirect
Sold, plan not stated
$1.05M 50,000 at 21.01
1.0%
2 Jul 2020
Bought
$4.43M 305,583 at 14.50
5.5%
First buy on file
2 Jul 2020
GIRSCHWEILER THOMAS Director · indirect
Sold, plan not stated
$4.43M 305,583 at 14.50
15.7%
1 Jul 2020
Bought
$9.93M 685,000 at 14.50
14.1%
First buy on file
22 May 2020
Bought
$5.00M 476,191 at 10.50
10.9%
First buy on file
22 May 2020
GIRSCHWEILER THOMAS Director · indirect
Sold, plan not stated
$5.00M 476,191 at 10.50
19.6%
14 May 2020
Bought
$20.00M 1,904,762 at 10.50
77.2%
First buy on file
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