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John T Dahldorf

CIK 1365494 · CFO · last filed 2026-05-22

John T Dahldorf is a CFO who has filed 51 SEC Form 4 insider transactions across 3 companies since 2007. The most recent filing, for QSIAW, was dated May 22, 2026. Across all open-market trades the lifetime net is −$10.4M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $18.0K across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

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Disclosed Exposure

$18.0K

Companies

3

Total Filings

51

Lifetime Open-Market Net

-$10.42M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
Hyperfine, Inc. (QSIAW) Delisted Director — $0.01 — $0 4 2026-05-22
HYPR Director 19,586 $0.92 $18.0K $0 3 2022-06-13
Volcano Corp (VOLC) Delisted CFO 59,314 — — -$10.42M 43 2015-01-05

Recent Filings

51 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
Filed Symbol Action Net Shares Net $ Link
2026-05-22 Hyperfine, Inc. (QSIAW) Delisted Grant (A) — $0 EDGAR
2025-05-20 Hyperfine, Inc. (QSIAW) Delisted Grant (A) — $0 EDGAR
2024-06-12 Hyperfine, Inc. (QSIAW) Delisted Grant (A) — $0 EDGAR
2023-06-12 Hyperfine, Inc. (QSIAW) Delisted Grant (A) — $0 EDGAR
2022-06-13 HYPR Grant (A) — $0 EDGAR
2022-01-10 HYPR Grant (A) +19,586 $0 EDGAR
2021-12-23 HYPR Grant (A) +16,483 $0 EDGAR
2015-02-19 — Disp (D) −60,064 -$1.08M
2015-01-05 Volcano Corp (VOLC) Delisted Mixed +3,366 -$36.7K EDGAR
2014-03-31 Volcano Corp (VOLC) Delisted Mixed +45 -$592 EDGAR
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.