SCHEDULE 13D/A Filed 2026-05-22 Event 2026-05-12 SEC 0000898432-26-000394 →

Cao Yu → FiEE, Inc. FIEE

Stake: 40.60% Shares: 4,615,012 CUSIP: 60365W102 Class: Common Stock, $0.01 par value

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

21 13D/G filings on this issuer

20 other filings besides this one

Filer Track Record

2 filings by this filer

1 other filing in the data moat

Short Interest · settle 2026-07-31

DTC 1.00

186,718 shares short · +1711.0% vs prior

Post-Filing Returns · since 2026-05-12 on FIEE

+1 day

0.0%

+5 days

0.0%

+30 days

0.0%

+60 days

+20.3%

+90 days

—

+180 days

—

Anchor price 3.45 on closest trading day on/after 2026-05-12. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Other 13D/G Filings on FiEE, Inc.

Filed	Form	Filer	Stake	Shares
2026-01-08	SCHEDULE	Yu Cao	42.10%	4,615,012	view →
2025-03-10	SCHEDULE	Lazar David E.	35.10%	2,802,254	view →
2025-01-15	SCHEDULE	HITCHCOCK JEREMY P.	—	—	view →
2024-01-02	SC	HITCHCOCK JEREMY P.	—	—	view →
2023-12-11	SC	HITCHCOCK JEREMY P.	—	—	view →
2023-10-11	SC	HITCHCOCK JEREMY P.	—	—	view →
2023-03-14	SC	HITCHCOCK JEREMY P.	—	—	view →
2021-08-20	SC	HITCHCOCK JEREMY P.	—	—	view →
2021-08-02	SC	Palm Management (US) LLC	—	—	view →
2020-12-08	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-11-16	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-10-14	SC	MANNING FRANK BLASE	—	—	view →
2020-10-13	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-09-30	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-09-04	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-08-04	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-04-08	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-01-21	SC	HITCHCOCK JEREMY P.	—	—	view →
2020-01-15	SC	HITCHCOCK JEREMY P.	—	—	view →
2019-10-21	SC	HITCHCOCK JEREMY P.	—	—	view →

Other Filings by Cao Yu

Filed	Form	Issuer	Stake	Shares
2026-01-08	SCHEDULE	FiEE, Inc. FIEE	42.10%	4,615,012	view →

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