rotation.to
Following this device: dark.
Free account
rotation.to
Sign in / Request free access
Appearance
Following this device: dark.
Drag a card by its title · ⚙ to size, swap or remove

Who

John T. Dahldorf

Director

Company insider

Files Form 4 as: Director, Hyperfine; CFO, Volcano.

Every Form 4 they filed

In numbers

Trades disclosed
229
Buys
0
Sells
35
Bought
$0
Sold
$11.9M
Companies
2
Companies where not an officer
1
First trade
12 Dec 2006
Last trade
22 May 2026
Last filed
22 May 2026

Companies traded

Where they are an officer
VolcanoOfficer · last 17 Feb 20150 buys · 35 sells
Everywhere else they filed: board seats, 10% stakes, other companies
HYPR HyperfineDirector · Medical Devices · last 22 May 20260 buys · 0 sells

Activity over time

1 Nov 2024 – 1 Oct 2026
101Nov 24May 25Nov 25Apr 26Oct 26

Buys above the line, sells below, each month.

Every trade

TradedCompanyWhatAmount
22 May 2026filed 22 May 2026HYPR Hyperfineoption or derivative · Medical DevicesSEC FORM 4 Code A—157,700 at $0.00filing
22 May 2026filed 22 May 2026HYPR Hyperfineoption or derivative · Medical DevicesSEC FORM 4 Code A—157,700 at $0.00filing
20 May 2025filed 20 May 2025HYPR Hyperfineoption or derivative · Medical DevicesSEC FORM 4 Code A—79,200 at $0.00filing
12 Jun 2024filed 12 Jun 2024HYPR Hyperfineoption or derivative · Medical DevicesSEC FORM 4 Code A—79,200 at $0.00filing
9 Jun 2023filed 12 Jun 2023HYPR Hyperfineoption or derivative · Medical DevicesSEC FORM 4 Code A—112,000 at $0.00filing
9 Jun 2023filed 12 Jun 2023HYPR Hyperfineoption or derivative · Medical DevicesSEC FORM 4 Code A—85,000 at $0.00filing
9 Jun 2022filed 13 Jun 2022HYPR Hyperfineoption or derivative · Medical DevicesSEC FORM 4 Code A—85,345 at $0.00filing
23 Dec 2021filed 10 Jan 2022HYPR HyperfineMedical DevicesSEC FORM 4 Code A—19,586 at $0.00filing
23 Dec 2021filed 23 Dec 2021HYPR HyperfineMedical DevicesSEC FORM 4 Code A—16,483 at $0.00filing
17 Feb 2015filed 19 Feb 2015VolcanoSEC FORM 4 Code D$1.1M60,064 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$183K42,500 at $4.31filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$59K3,305 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$81045 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$255K14,148 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$104K5,750 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$117K6,526 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$291K16,166 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$4,014223 at $18.00filing
17 Feb 2015filed 19 Feb 2015Volcanooption or derivativeSEC FORM 4 Code D$255K14,148 at $18.00filing
2 Jan 2015filed 5 Jan 2015VolcanoSEC FORM 4 Sold$14K782 at $17.88filing

News

No headline names them, or the companies they trade most, lately.

Sectors

Not placed35

Buys in green, sells in red, by the company’s sector.

Related people

Nobody else traded the same names lately.