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John W Kosiba JR

CIK 1703463 · SVP, CFO & Treasurer · last filed 2026-06-11

John W Kosiba JR is a SVP, CFO & Treasurer who has filed 65 SEC Form 4 insider transactions across 2 companies since 2017. The most recent filing, for AMSC, was dated Jun 11, 2026. Across all open-market trades the lifetime net is −$12.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $10.1M 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

$10.13M

Companies

2

Total Filings

65

Lifetime Open-Market Net

-$12.61M

Filer Profile

Reported Address
C/O AMERICAN SUPERCONDUCTOR CORPORATION
64 JACKSON ROAD
DEVENS, MA 01434
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

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
AMSC SVP, CFO & Treasurer 334,748 $30.19 $10.11M -$12.47M 35 2026-06-11
NNDM SVP, CFO & Treasurer 18,329 $1.57 $28.8K -$145.6K 16 2019-07-30

Recent Filings

65 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
2026-06-11 AMSC Notice (144) −6,769 -$253.6K EDGAR
2026-06-11 AMSC Sell (S) −6,769 -$253.6K EDGAR
2026-06-10 AMSC Sell (S) −4,835 -$202.0K EDGAR
2026-06-08 AMSC Notice (144) −4,835 -$202.0K EDGAR
2026-06-03 AMSC Notice (144) −6,447 -$315.5K EDGAR
2026-06-03 AMSC Mixed −6,909 -$1.86M EDGAR
2026-06-02 AMSC Notice (144) −30,462 -$1.55M EDGAR
2025-08-06 AMSC Sell (S) −59,843 -$3.27M EDGAR
2025-08-04 AMSC Notice (144) −50,000 -$2.73M EDGAR
2025-06-12 AMSC Sell (S) −6,642 -$189.8K EDGAR
Showing 1–10 of 65
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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.