SEC Form 4 · Updated Daily
ATCO
Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| AWM Investment Company, Inc. | 10%+ Owner | 5,678,319 | 2024-11-01 | S |
| MARXE AUSTIN W & GREENHOUSE DAVID M | 10%+ Owner | 4,667,710 | 2013-06-07 | P |
| NORRIS ELWOOD G | 10%+ Owner · Director | 2,970,624 | 2011-03-31 | S |
| Osgood Richard Hoe III | Director | 552,430 | 2025-10-01 | A |
| Danforth Richard | Director · Officer | 394,692 | 2026-05-14 | D |
| Anchin Scott L | Director | 298,152 | 2024-03-14 | A |
| Clague Laura | Director | 284,311 | 2022-04-27 | M |
| Brown Thomas R | Director · Officer | 224,703 | 2015-08-18 | P |
| Malhotra R. Rimmy | Director | 197,285 | 2026-08-26 | P |
| Coburn John G | Director | 195,344 | 2021-03-16 | A |
| Schmeiser Susan Lee | Director | 193,256 | 2026-03-17 | A |
| HUNTER DANIEL | Director | 191,500 | 2010-03-10 | M |
| Dodd William H | Director | 176,783 | 2026-03-17 | A |
| Fugate William Craig | Director | 115,821 | 2026-03-17 | A |
| Culhane Mark | Director | 114,547 | 2025-10-01 | A |
| WAGNER RICHARD | Director | 109,100 | 2006-02-16 | M |
| Seymour Caltha | Director | 107,500 | 2024-03-14 | A |
| McCollum Daniel H | Director | 90,383 | 2021-03-16 | A |
| HERNANDEZ-MONTEON CASSANDRA L | Officer | 76,039 | 2026-05-14 | D |
| Klahn Dennis D | Officer | 72,389 | 2025-02-14 | F |
| MCDERMOTT KATHERINE H | Officer | 61,585 | 2015-06-15 | M |
| Wend Dennis James | Director | 55,000 | 2015-08-13 | P |
| Hagenbuch Lawrence F | Director | 48,498 | 2026-03-26 | A |
| CARTER DAVID J | Director | 24,000 | 2006-03-09 | S |
| CROFT JAMES III | Officer | 4,050 | 2006-08-24 | P |
| Smith Raymond C | Director | 0 | 2006-03-15 | — |
| Peacock Charles | Officer | 0 | 2006-06-30 | — |
| Taylor James T III | Officer | 0 | 2006-04-17 | — |
| Stringer Steven Dale | Officer | 0 | 2006-04-03 | — |
| Carnevale David A | Officer | 0 | 2006-01-23 | — |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-26 | Malhotra R. Rimmy | Open-market buy | 1,000 | $1.54 | 197,285 |
| 2026-05-14 | Danforth Richard | Disposition to issuer | 200,000 | $0.00 | 394,692 |
| 2026-05-14 | HERNANDEZ-MONTEON CASSANDRA L | Disposition to issuer | 11,667 | $0.00 | 76,039 |
| 2026-03-26 | Hagenbuch Lawrence F | Grant / award | 48,498 | $0.00 | 48,498 |
| 2026-03-17 | Schmeiser Susan Lee | Grant / award | 47,620 | $0.00 | 193,256 |
| 2026-03-17 | Malhotra R. Rimmy | Grant / award | 47,620 | $0.00 | 196,285 |
| 2026-03-17 | Fugate William Craig | Grant / award | 47,620 | $0.00 | 115,821 |
| 2026-03-17 | Dodd William H | Grant / award | 47,620 | $0.00 | 176,783 |
| 2026-02-19 | Dodd William H | Open-market buy | 25,430 | $1.98 | 129,163 |
| 2026-02-18 | Dodd William H | Open-market buy | 27 | $1.97 | 103,733 |
| 2026-01-26 | Danforth Richard | Grant / award | 400,000 | $0.00 | 594,692 |
| 2025-12-24 | HERNANDEZ-MONTEON CASSANDRA L | Grant / award | 70,000 | $0.00 | 87,706 |
| 2025-12-11 | HERNANDEZ-MONTEON CASSANDRA L | Grant / award | 10,000 | $0.00 | 17,706 |
| 2025-10-01 | Osgood Richard Hoe III | Grant / award | 6,411 | $0.00 | 552,430 |
| 2025-10-01 | Malhotra R. Rimmy | Grant / award | 6,411 | $0.00 | 148,665 |
| 2025-10-01 | Dodd William H | Grant / award | 6,411 | $0.00 | 103,706 |
| 2025-10-01 | Culhane Mark | Grant / award | 6,411 | $0.00 | 114,547 |
| 2025-10-01 | Fugate William Craig | Grant / award | 6,411 | $0.00 | 68,201 |
| 2025-07-01 | HERNANDEZ-MONTEON CASSANDRA L | — | — | — | 6,540 |
| 2025-07-01 | HERNANDEZ-MONTEON CASSANDRA L | — | — | — | 1,166 |
| 2025-07-01 | HERNANDEZ-MONTEON CASSANDRA L | — | — | — | 1,913 |
| 2025-03-17 | Malhotra R. Rimmy | Grant / award | 38,136 | $0.00 | 142,254 |
| 2025-03-17 | Fugate William Craig | Grant / award | 38,136 | $0.00 | 61,790 |
| 2025-03-17 | Culhane Mark | Grant / award | 38,136 | $0.00 | 108,136 |
| 2025-03-17 | Dodd William H | Grant / award | 38,136 | $0.00 | 97,295 |
| 2025-03-17 | Schmeiser Susan Lee | Grant / award | 38,136 | $0.00 | 145,636 |
| 2025-03-17 | Osgood Richard Hoe III | Grant / award | 38,136 | $0.00 | 546,019 |
| 2025-02-14 | Klahn Dennis D | Tax withholding | 4,108 | $3.38 | 72,389 |
| 2025-02-10 | Klahn Dennis D | Tax withholding | 1,369 | $2.92 | 76,497 |
| 2025-01-15 | Malhotra R. Rimmy | — | — | — | 99,118 |
| 2025-01-15 | Malhotra R. Rimmy | — | — | — | 1,628,495 |
| 2025-01-15 | Malhotra R. Rimmy | — | — | — | 300 |
| 2025-01-15 | Malhotra R. Rimmy | Grant / award | 5,000 | — | 104,118 |
| 2024-12-12 | Osgood Richard Hoe III | Open-market buy | 100,000 | $2.64 | 507,883 |
| 2024-12-12 | Klahn Dennis D | Grant / award (derivative) | 90,000 | $0.00 | 90,000 |
| 2024-12-12 | Osgood Richard Hoe III | Open-market buy | 10,000 | $2.64 | 507,883 |
| 2024-12-11 | Dodd William H | Open-market buy | 16,327 | $2.65 | 59,159 |
| 2024-11-05 | AWM Investment Company, Inc. | Open-market sale | 28,732 | $3.69 | 5,649,544 |
| 2024-11-04 | AWM Investment Company, Inc. | Open-market sale | 43 | $3.70 | 5,678,276 |
| 2024-11-01 | AWM Investment Company, Inc. | Open-market sale | 71,225 | $3.67 | 5,678,319 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.