As of September 29, 2026, the three largest insider holders of ATR are Stephan B. Tanda (President And Ceo, 238.73K shares), Robert Kuhn (Evp Cfo, 65.55K shares), Daniel Ackerman (Chief Accounting Officer, 32.78K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Stephan B. Tanda | President And Ceo | 238,729 | 0 | 238,729 | 41.2% | 04 Aug, 2026 |
| 2 | Robert Kuhn | Evp Cfo | 65,552 | 0 | 65,552 | 11.3% | 27 Aug, 2024 |
| 3 | Daniel Ackerman | Chief Accounting Officer | 32,779 | 0 | 32,779 | 5.7% | 04 May, 2026 |
| 4 | Gael Touya | President And Ceo | 31,739 | 0 | 31,739 | 5.5% | 02 Sep, 2026 |
| 5 | Shiela Vinczeller | Chief Human Resources Officer | 26,313 | 0 | 26,313 | 4.5% | 03 Sep, 2026 |
| 6 | Vanessa Kanu | Evp Cfo | 24,646 | 0 | 24,646 | 4.3% | 20 Mar, 2026 |
| 7 | Ralf K. Wunderlich | Director | 18,690 | 0 | 18,690 | 3.2% | 17 Jul, 2026 |
| 8 | Marc Prieur | Segment President | 15,823 | 0 | 15,823 | 2.7% | 05 Aug, 2026 |
| 9 | Hedi Tlili | Segment President | 15,379 | 0 | 15,379 | 2.7% | 03 Aug, 2026 |
| 10 | Andreas Kramvis | Director | 12,962 | 0 | 12,962 | 2.2% | 04 May, 2023 |
| 11 | B Craig Owens | Director | 11,234 | 0 | 11,234 | 1.9% | 17 Jul, 2026 |
| 12 | Kimberly Chainey | Evp And Chief Legal Officer | 11,088 | 0 | 11,088 | 1.9% | 10 Jun, 2025 |
| 13 | Xiangwei Gong | President, Asia | 10,774 | 0 | 10,774 | 1.9% | 27 May, 2026 |
| 14 | Monnas Giovanna Kampouri | Director | 10,128 | 0 | 10,128 | 1.8% | 17 Jul, 2026 |
| 15 | Isabel Marey-Semper | Director | 9,821 | 0 | 9,821 | 1.7% | 17 Jul, 2026 |
| 16 | Matthew L. Trerotola | Director | 9,307 | 0 | 9,307 | 1.6% | 17 Jul, 2026 |
| 17 | Candace S. Matthews | Director | 8,101 | 0 | 8,101 | 1.4% | 17 Jul, 2026 |
| 18 | George L Fotiades | Director | 6,446 | 0 | 6,446 | 1.1% | 17 Jul, 2026 |
| 19 | Maritza Gomez Montiel | Director | 5,290 | 0 | 5,290 | 0.9% | 04 May, 2023 |
| 20 | Julie Xing | Director | 5,242 | 0 | 5,242 | 0.9% | 17 Jul, 2026 |
| 21 | Sarah Js Glickman | Director | 4,553 | 0 | 4,553 | 0.8% | 17 Jul, 2026 |
| 22 | Aditya Gandhi | Cao | 2,664 | 0 | 2,664 | 0.5% | 16 Jun, 2026 |
| 23 | Irene Elizabeth Hudson | Evp And Chief Legal Officer | 1,480 | 0 | 1,480 | 0.3% | 08 May, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 02 Sep, 2026 | Shiela Vinczeller | Chief Human Resources Officer | Disposed S | 765 | $130.37 | $99.73K | 26,313 | Direct |
| 01 Sep, 2026 | Gael Touya | President And Ceo | Acquired A | 2,637 | $0.00 | $0 | 31,739 | Direct |
| 01 Sep, 2026 | Gael Touya | President And Ceo | Acquired A | 9,531 | $0.00 | $0 | 9,531 | Direct |
| 27 Aug, 2026 | Gael Touya | Segment Pres., Ceo Designate | Disposed S | 3,415 | $133.69 | $456.55K | 29,427 | Direct |
| 27 Aug, 2026 | Gael Touya | Segment Pres., Ceo Designate | Disposed S | 325 | $134.55 | $43.73K | 29,102 | Direct |
| 04 Aug, 2026 | Marc Prieur | Segment President | Disposed S | 3,376 | $136.23 | $459.90K | 15,947 | Direct |
| 04 Aug, 2026 | Marc Prieur | Segment President | Disposed S | 124 | $137.10 | $17.00K | 15,823 | Direct |
| 03 Aug, 2026 | Stephan B. Tanda | President And Ceo | Acquired M | 9,838 | $74.79 | $735.78K | 248,567 | Direct |
| 03 Aug, 2026 | Stephan B. Tanda | President And Ceo | Disposed S | 9,838 | $136.16 | $1.34Mn | 238,729 | Direct |
| 03 Aug, 2026 | Stephan B. Tanda | President And Ceo | Disposed M | 9,838 | $0.00 | $0 | 0 | Direct |
| 03 Aug, 2026 | Hedi Tlili | Segment President | Disposed S | 8,854 | $135.00 | $1.20Mn | 15,379 | Direct |
| 16 Jul, 2026 | Matthew L. Trerotola | Director | Acquired A | 151 | $0.00 | $0 | 9,307 | Direct |
| 16 Jul, 2026 | Monnas Giovanna Kampouri | Director | Acquired A | 151 | $0.00 | $0 | 10,128 | Direct |
| 16 Jul, 2026 | Sarah Js Glickman | Director | Acquired A | 151 | $0.00 | $0 | 4,553 | Direct |
| 16 Jul, 2026 | Ralf K. Wunderlich | Director | Acquired A | 151 | $0.00 | $0 | 18,690 | Direct |
| 16 Jul, 2026 | B Craig Owens | Director | Acquired A | 151 | $0.00 | $0 | 11,234 | Direct |
| 16 Jul, 2026 | George L Fotiades | Director | Acquired A | 151 | $0.00 | $0 | 6,446 | Direct |
| 16 Jul, 2026 | Isabel Marey-Semper | Director | Acquired A | 151 | $0.00 | $0 | 9,821 | Direct |
| 16 Jul, 2026 | Julie Xing | Director | Acquired A | 151 | $0.00 | $0 | 5,242 | Direct |
| 16 Jul, 2026 | Candace S. Matthews | Director | Acquired A | 226 | $0.00 | $0 | 8,101 | Direct |