As of September 29, 2026, the three largest insider holders of EFOI are Chiao Chieh Huang (Chief Executive Officer, 1.42Mn shares), Gina Huang (Director, 10.63K shares), Chiao Chieh Huang (Director, 7.60K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Chiao Chieh Huang | Chief Executive Officer | 1,421,219 | 0 | 1,421,219 | 99.2% | 31 Dec, 2025 |
| 2 | Gina Huang | Director, TenPercentOwner | 0 | 10,629 | 10,629 | 0.7% | 04 Apr, 2023 |
| 3 | Philip Politziner | Director | 90 | 0 | 90 | 0.0% | 23 Jun, 2022 |
| 4 | Stephen Socolof | Chairman And Interim Ceo | 73 | 0 | 73 | 0.0% | 23 Jun, 2022 |
| 5 | Jennifer Y Cheng | Director | 63 | 0 | 63 | 0.0% | 23 Jun, 2022 |
| 6 | Brian J Lagarto | Director | 29 | 0 | 29 | 0.0% | 23 Jun, 2022 |
| 7 | Jeffery Robert Parker | Director | 29 | 0 | 29 | 0.0% | 23 Jun, 2022 |
| 8 | James Raymond Iii Warren | Svp, Gc Corp. Secretary | 5 | 0 | 5 | 0.0% | 29 Sep, 2022 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 26 Nov, 2025 | Chiao Chieh Huang | Chief Executive Officer | Acquired P | 262,009 | $2.29 | $600.00K | 1,421,219 | Direct |
| 15 Aug, 2025 | Chiao Chieh Huang | Chief Executive Officer | Acquired P | 264,550 | $1.89 | $500.00K | 1,159,210 | Direct |
| 29 Jun, 2023 | Chiao Chieh Huang | Director, TenPercentOwner | Acquired A | 343,465 | $1.76 | $604.50K | 680,536 | Direct |
| 28 Apr, 2023 | James Raymond Iii Warren | Svp, Gc Corp. Secretary | Acquired A | 30,000 | $151.90 | $4.56Mn | 86 | Direct |
| 28 Apr, 2023 | Lesley A. Matt | Chief Executive Officer | Acquired A | 40,000 | $151.90 | $6.08Mn | 114 | Direct |
| 30 Mar, 2023 | Gina Huang | Director, TenPercentOwner | Acquired A | 500,000 | $175.00 | $87.50Mn | 10,629 | Indirect |
| 28 Mar, 2023 | Chiao Chieh Huang | Director, TenPercentOwner | Acquired A | 108,502 | $196.31 | $21.30Mn | 7,597 | Indirect |
| 17 Jan, 2023 | Gina Huang | Director, TenPercentOwner | Acquired A | 1,451,597 | $197.05 | $286.03Mn | 6,906 | Indirect |
| 24 Feb, 2023 | Gina Huang | Director, TenPercentOwner | Acquired A | 803,212 | $174.30 | $140.00Mn | 9,201 | Indirect |
| 10 Jan, 2023 | Gina Huang | Director, TenPercentOwner | Acquired A | 325,803 | $161.14 | $52.50Mn | 2,758 | Indirect |
| 05 Jan, 2023 | Gina Huang | Director, TenPercentOwner | Acquired A | 257,798 | $135.76 | $35.00Mn | 1,828 | Indirect |
| 28 Sep, 2022 | James Raymond Iii Warren | Svp, Gc Corp. Secretary | Acquired M | 800 | $0.00 | $0 | 5 | Direct |
| 28 Sep, 2022 | James Raymond Iii Warren | Svp, Gc Corp. Secretary | Disposed M | 800 | $0.00 | $0 | 5 | Direct |
| 04 Sep, 2022 | Daas Kaj Den | Director | Acquired A | 10,000 | $0.00 | $0 | 29 | Direct |
| 12 Sep, 2022 | Lesley A. Matt | Chief Executive Officer | Acquired A | 150,000 | $0.00 | $0 | 429 | Direct |
| 01 Aug, 2022 | Clifford R. Griffin | Svp, Corp. Controller Cao | Acquired A | 6,000 | $259.62 | $1.56Mn | 17 | Direct |
| 22 Jun, 2022 | Philip Politziner | Director | Acquired M | 5,000 | $0.00 | $0 | 90 | Direct |
| 22 Jun, 2022 | Jeffery Robert Parker | Director | Acquired M | 10,000 | $0.00 | $0 | 29 | Direct |
| 22 Jun, 2022 | Stephen Socolof | Chairman And Interim Ceo | Acquired M | 5,000 | $0.00 | $0 | 73 | Direct |
| 22 Jun, 2022 | Brian J Lagarto | Director | Acquired M | 10,000 | $0.00 | $0 | 29 | Direct |