NASDAQ : ATRO
-$1.15 (-1.62%)
1.89%
35
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0.00
change: -6.2311 | last: 0.062358.44M
| Filing Date | Reporting Person | Amount Beneficially Owned | % of Class |
|---|---|---|---|
| 2026-07-14 | Dimensional Fund Advisors LP | 345.14K | 7.50% |
| 2026-07-08 | STATE STREET CORPORATION | 475.87K | 10.40% |
| 2026-07-08 | BlackRock, Inc. | 481.1K | 12.60% |
| 2026-05-14 | Capital International Investors | 1.29M | 4.00% |
| 2026-05-12 | STATE STREET CORPORATION | 2.35M | 7.40% |
| 2026-04-29 | Vanguard Capital Management | 1.62M | 5.07% |
| 2026-03-26 | The Vanguard Group | - | 0.00% |
| 2026-02-13 | Capital International Investors | 1.85M | 5.90% |
| 2026-02-13 | American Century Investment Management, Inc. | 1.76M | 5.60% |
| 2026-02-09 | STATE STREET CORPORATION | 1.83M | 5.80% |
| 2026-01-21 | BlackRock, Inc. | 2.75M | 8.70% |
| 2026-01-15 | 325 CAPITAL LLC | - | 0.00% |
| 2026-01-15 | 325 Capital Master Fund LP | - | 0.00% |
| 2026-01-15 | Shrivastava Anil K | - | 0.00% |
| 2026-01-15 | 325 Capital GP, LLC | - | 0.00% |
| 2026-01-15 | Braner Michael David | - | 0.00% |
| 2026-01-15 | FRIEDBERG DANIEL M. | - | 0.00% |
| 2025-11-18 | ACK Asset Management LLC | 1.23M | 4.00% |
| 2025-10-30 | The Vanguard Group | 1.94M | 6.23% |
| 2025-08-13 | THE GOLDMAN SACHS GROUP, INC. | 223.44K | 0.70% |
| 2025-05-15 | REDWOOD CAPITAL MANAGEMENT LLC | 225.89K | 0.70% |
| 2025-05-09 | THE GOLDMAN SACHS GROUP, INC. | 1.56M | 5.20% |
| 2025-04-17 | BlackRock, Inc. | 2.19M | 7.20% |
| 2025-02-14 | REDWOOD CAPITAL MANAGEMENT LLC | 2.12M | 6.80% |
| 2025-02-13 | NEXT CENTURY GROWTH INVESTORS LLC | 1.43M | 4.80% |
| 2025-02-05 | BlackRock, Inc. | 2.59M | 8.70% |
| 2025-01-07 | Patricia Dowden | 2281.0 | 0.00% |
| 2024-12-12 | ACK Asset Management LLC | 2.06M | 6.94% |
| 2024-12-12 | John Reilly | 2.06M | 6.94% |
| 2024-12-12 | Richard Meisenberg | 2.06M | 6.94% |
| 2023-02-14 | 74-2961140 | 1.54M | 5.95% |
| 2023-02-14 | Brian Bares | 1.54M | 5.95% |
| 2023-02-09 | The Vanguard Group - 23-1945930 | 1.3M | 5.03% |
| 2022-02-10 | Paradice Investment Management Pty Ltd | 1.26M | 5.00% |
| 2022-02-10 | Paradice Investment Management LLC | 1.26M | 5.00% |
| 2022-02-01 | (1) BlackRock, Inc. | 2.07M | 8.30% |
| 2021-02-10 | The Vanguard Group - 23-1945930 | 1.14M | 4.77% |
| 2021-02-04 | Wellington Management Group LLP | - | 0.00% |
| 2021-01-29 | (1) BlackRock, Inc. | 2.08M | 8.70% |
| 2020-09-09 | International Value Advisers, LLC | 1.82M | 7.70% |
| 2020-08-25 | 5096 SARANAC LLC | - | 0.00% |
| 2020-08-25 | Robert S. Keane | 655.08K | 9.10% |
| 2020-08-25 | BOSTON & SARANAC LLC | 448.2K | 6.30% |
| 2020-08-25 | Patricia Dowden | 450.48K | 6.40% |
| 2020-08-25 | Daniel G. Keane | 348.2K | 1.60% |
| 2020-05-08 | International Value Advisers, LLC | 3.43M | 14.72% |
| 2020-04-09 | Neuberger Berman Group LLC | - | 0.00% |
| 2020-03-09 | International Value Advisers, LLC | 3.59M | 15.53% |
| 2020-02-13 | Neuberger Berman Investment Advisers LLC | 1.28M | 5.52% |
| 2020-02-13 | Neuberger Berman Group LLC | 1.28M | 5.52% |
| 2020-02-13 | Neuberger Berman Equity Funds | 889.83K | 2.88% |
| 2020-02-12 | The Vanguard Group - 23-1945930 | 1.87M | 6.04% |
| 2020-02-10 | International Value Advisers, LLC | 2.81M | 12.15% |
| 2020-02-05 | (1) BlackRock, Inc. | 2.01M | 8.70% |
| 2020-01-28 | Wellington Management Company LLP | 1.72M | 5.58% |
| 2020-01-28 | Wellington Management Group LLP | 1.74M | 5.65% |
| 2020-01-28 | Wellington Group Holdings LLP | 1.74M | 5.65% |
| 2020-01-28 | Wellington Investment Advisors Holdings LLP | 1.74M | 5.65% |
| 2019-04-01 | John Reilly | 1.18M | 4.83% |
| 2019-04-01 | Richard Meisenberg | 1.18M | 4.83% |
| 2019-04-01 | ACK Asset Management LLC | 1.18M | 4.83% |
| 2019-02-13 | International Value Advisers, LLC | 1.49M | 6.86% |
| 2019-02-13 | Select Defense and Aerospace Portfolio | 1.57M | 7.25% |
| 2019-02-13 | Abigail P. Johnson | 2.26M | 10.43% |
| 2019-02-13 | FMR LLC | 2.26M | 10.43% |
| 2019-02-12 | John Reilly | 1.18M | 5.45% |
| 2019-02-12 | Wellington Management Company LLP | 1.48M | 6.84% |
| 2019-02-12 | Richard Meisenberg | 1.18M | 5.45% |
| 2019-02-12 | Wellington Investment Advisors Holdings LLP | 1.51M | 6.97% |
| 2019-02-12 | ACK Asset Management LLC | 1.18M | 5.45% |
| 2019-02-12 | Wellington Group Holdings LLP | 1.51M | 6.97% |
| 2019-02-12 | Wellington Management Group LLP | 1.51M | 6.97% |
| 2019-01-24 | (1) BlackRock, Inc. | 2.94M | 11.50% |
| 2018-02-13 | Abigail P. Johnson | 2.7M | 12.83% |
| 2018-02-13 | Select Defense and Aerospace Portfolio | 1.36M | 6.44% |
| 2018-02-13 | FMR LLC | 2.7M | 12.83% |
| 2018-02-12 | 2. | 1.2M | 5.70% |
| 2018-02-08 | Wellington Management Group LLP | 1.37M | 6.51% |
| 2018-02-08 | Wellington Group Holdings LLP | 1.37M | 6.51% |
| 2018-02-08 | Wellington Investment Advisors Holdings LLP | 1.37M | 6.51% |
| 2018-02-08 | Wellington Management Company LLP | 1.27M | 6.03% |
| 2018-01-19 | (1) BlackRock, Inc. | 2.35M | 10.80% |
| 2017-09-11 | FMR LLC | 2.28M | 10.49% |
| 2017-09-08 | (1) BlackRock, Inc. | 2.22M | 10.30% |
| 2017-07-10 | Wellington Management Group LLP | 737.65K | 3.41% |
| 2017-07-10 | Wellington Investment Advisors Holdings LLP | 737.65K | 3.41% |
| 2017-07-10 | Wellington Group Holdings LLP | 737.65K | 3.41% |
| 2017-05-15 | Kevin T. Keane | 1.73M | 7.00% |
| 2017-05-15 | 5096 SARANAC LLC | 1.3M | 4.50% |
| 2017-05-15 | Daniel G. Keane | 1.3M | 4.50% |
| 2017-04-10 | 5096 SARANAC LLC | 1.3M | 4.50% |
| 2017-04-10 | Kevin T. Keane | 1.94M | 7.00% |
| 2017-04-10 | Daniel G. Keane | 1.3M | 4.50% |
| 2017-02-14 | Neuberger Berman Equity Funds | 1.21M | 6.23% |
| 2017-02-14 | Neuberger Berman Investment Advisers LLC | 1.62M | 8.32% |
| 2017-02-14 | Neuberger Berman Group LLC | 1.62M | 8.32% |
| 2017-02-10 | 2. | 1.28M | 6.60% |
| 2017-02-09 | Wellington Management Company LLP | 1.66M | 8.54% |
| 2017-02-09 | Wellington Management Group LLP | 1.75M | 9.00% |
| 2017-02-09 | Wellington Group Holdings LLP | 1.75M | 9.00% |
| 2017-02-09 | Wellington Investment Advisors Holdings LLP | 1.75M | 9.00% |
| 2017-02-03 | The PNC Financial Services Group, Inc. | 1.44M | 7.40% |
| 2017-01-19 | (1) BlackRock, Inc. | 1.66M | 7.30% |
| 2016-02-11 | Wellington Investment Advisors Holdings LLP | 1.49M | 8.58% |
| 2016-02-11 | Wellington Group Holdings LLP | 1.49M | 8.58% |
| 2016-02-11 | Wellington Management Company LLP | 1.44M | 8.27% |
| 2016-02-11 | Wellington Management Group LLP | 1.49M | 8.58% |
| 2016-02-10 | 2. | 1.23M | 7.10% |
| 2016-01-25 | (1) BlackRock, Inc. | 1.39M | 8.00% |
| 2015-11-10 | Wellington Management Group LLP | 1.83M | 10.57% |
| 2015-09-10 | Lord, Abbett & Co. LLC | 752.77K | 4.36% |
| 2015-03-09 | 47-0875103 | 676.38K | 4.06% |
| 2015-02-13 | Lord, Abbett & Co. LLC | 1.31M | 8.88% |
| 2015-02-09 | Franklin Resources, Inc. | 882.91K | 6.00% |
| 2015-01-29 | 47-0875103 | 892.16K | 6.07% |
| 2015-01-23 | (1) BlackRock, Inc. | 1.19M | 8.10% |
| 2014-02-14 | 04-2683227 | 645.98K | 5.38% |
| 2014-01-28 | (1) BlackRock, Inc. | 881.16K | 7.30% |
| 2013-11-08 | 04-2683227 | 789.8K | 6.58% |
| 2013-07-09 | NSB Advisors LLC | 265.24K | 1.00% |
| 2013-02-14 | 04-2683227 | 1.19M | 12.01% |
| 2013-02-08 | (1) BlackRock, Inc. | 700.26K | 7.07% |
| 2013-01-24 | Lewis Capital Management, LLC | 509.61K | 5.13% |
| 2012-12-10 | 04-2683227 | 1.11M | 11.13% |
| 2012-10-10 | NSB Advisors LLC | 9.0 | 1.00% |
| 2012-07-26 | Utility Service Holding Company, Inc. (USHC) | - | 0.00% |
| 2012-07-09 | NSB Advisors LLC | 1.9M | 1.00% |
| 2012-02-14 | NSB Advisors LLC | 272.42K | 9.00% |
| 2012-02-13 | (1) BlackRock, Inc. | 594.13K | 6.47% |
| 2011-02-02 | (1) BlackRock, Inc. | 590.19K | 6.73% |
| 2011-01-10 | NSB Advisors LLC | 2.42M | 27.60% |
| 2010-05-11 | Brown Advisory Holdings Incorporated ("BAHI") | 2.23M | 1.00% |
| 2010-01-29 | BlackRock for purposes of Schedule 13G filings. | 531.71K | 6.48% |
| 2010-01-28 | The Northwestern Mutual Life Insurance Company | 33040.0 | 0.40% |
| 2009-02-03 | The Northwestern Mutual Life Insurance Company | 359.78K | 5.20% |
| 2008-02-11 | Athena Capital Management, Inc. 23-2520198 Minerva Group, LP David P. Cohen | 62795.0 | 2.10% |
| 2008-02-08 | Lewis Capital Management, LLC | 300.73K | 4.47% |
| 2008-02-01 | Oak Forest Investment Management, Inc., 52-1947554 | 401.31K | 5.95% |
| 2007-05-10 | Edward C. Johnson 3d | 11416.0 | 0.17% |
| 2007-05-10 | FMR Corp. | 11416.0 | 0.17% |
| 2007-02-14 | Edward C. Johnson 3d | 385.73K | 5.83% |
| 2007-02-14 | FMR Corp. | 385.73K | 5.83% |
| 2007-01-23 | Lewis Capital Management, LLC | 372.21K | 5.62% |
| 2007-01-23 | Lewis Capital Management, LLC | 372.21K | 5.62% |
| 2007-01-22 | Oak Forest Investment Management, Inc., 52-1947554 | 453.15K | 6.85% |
| 2006-12-11 | FMR Corp. | 444.12K | 6.71% |
| 2006-12-11 | Edward C. Johnson 3d | 444.12K | 6.71% |
| 2006-02-14 | Edward C. Johnson 3d | 749.14K | 11.81% |
| 2006-02-14 | FMR Corp. | 749.14K | 11.81% |
| 2006-01-18 | Oak Forest Investment Management, Inc., 52-1947554 | 451.15K | 7.80% |
| 2006-01-17 | Lewis Capital Management, LLC | 365.93K | 5.77% |
| 2005-08-10 | Abigail P. Johnson | - | 0.00% |
| 2005-08-10 | FMR Corp. | - | 0.00% |
| 2005-08-10 | Edward C. Johnson 3d | - | 0.00% |
| 2005-02-17 | Oak Forest Investment Management, Inc., 52-1947554 | 449.36K | 7.80% |
| 2004-02-12 | Oak Forest Investment Management, Inc., 52-1947554 | 449.36K | 7.80% |
| 2003-04-10 | FMR Corp. | 203.19K | 10.05% |
| 2003-04-10 | Abigail P. Johnson | 203.19K | 10.05% |
| 2003-04-10 | Edward C. Johnson 3d | 203.19K | 10.05% |
| 2003-02-13 | Abigail P. Johnson | 604.8K | 10.34% |
| 2003-02-13 | Edward C. Johnson 3d | 604.8K | 10.34% |
| 2003-02-13 | FMR Corp. | 604.8K | 10.34% |
| 2003-01-23 | 04-1054788 | 612.4K | 11.59% |
| 2003-01-22 | 04-1054788 | 172.18K | 2.94% |
| 2003-01-10 | Oak Forest Investment Management, Inc. 52-1947554 | 437.5K | 7.50% |
| 2002-03-08 | 04-1054788 | 520.81K | 9.18% |
| 2002-02-13 | Abigail P. Johnson | 203.19K | 7.89% |
| 2002-02-13 | FMR Corp. | 203.19K | 7.89% |
| 2002-02-13 | Abigail P. Johnson | 596.7K | 10.88% |
| 2002-02-13 | Edward C. Johnson 3d | 203.19K | 7.89% |
| 2002-02-13 | Edward C. Johnson 3d | 596.7K | 10.88% |
| 2002-02-13 | FMR Corp. | 596.7K | 10.88% |
| 2002-02-06 | Oak Forest Investment Management, Inc. 52-1947554 | 426.2K | 7.80% |
| 2002-01-11 | 04-1054788 | 538.11K | 18.49% |
| 2001-12-06 | 04-1054788 | 529.81K | 18.20% |
| 2001-03-09 | Edward C. Johnson 3d | 543.15K | 10.56% |
| 2001-03-09 | Abigail P. Johnson | 543.15K | 10.56% |
| 2001-03-09 | FMR Corp. | 543.15K | 10.56% |
| 2001-02-13 | Edward C. Johnson 3d | 456.15K | 9.05% |
| 2001-02-13 | Abigail P. Johnson | 456.15K | 9.05% |
| 2001-02-13 | FMR Corp. | 456.15K | 9.05% |
| 2001-01-31 | Oak Forest Investment Management, Inc., 52-1947554 | 486K | 9.50% |
| 2000-02-11 | Edward C. Johnson 3d | 387.95K | 7.76% |
| 2000-02-11 | Abigail P. Johnson | 387.95K | 7.76% |
| 2000-02-11 | FMR Corp. | 387.95K | 7.76% |
| 2000-02-10 | Oak Forest Investment Management, Inc., 52-1947554 | 491K | 9.80% |
| 2000-02-09 | 52-1452536 | - | 0.00% |
| 1999-02-08 | Wilen Management Company,Inc. | 352.21K | 5.90% |
| 1998-02-20 | Wilen Management Company,Inc. | 361.5K | 8.50% |
| Date | Stock Price | Shares Outstanding | Market Cap | Cash & Equivalents | Total Debt | Enterprise Value |
|---|---|---|---|---|---|---|
| 2025-12-31 | $45.20 | 38.48M | $1.74B | $18.18M | $378.35M | $2.1B |
| 2024-12-31 | $13.30 | 35.25M | $468.82M | $9.28M | $193.87M | $653.41M |
| 2023-12-31 | $14.52 | 33.03M | $479.54M | $11.31M | $197.88M | $666.11M |
| 2022-12-31 | $8.58 | 32.2M | $276.31M | $13.78M | $178.41M | $440.95M |
| 2021-12-31 | $10.00 | 31.19M | $311.93M | $29.76M | $181.8M | $463.97M |
| 2020-12-31 | $11.02 | 30.79M | $339.34M | $40.41M | $197.45M | $496.37M |
| 2019-12-31 | $23.29 | 32.11M | $747.82M | $31.91M | $218.48M | $934.4M |
| 2018-12-31 | $25.38 | 32.35M | $821.07M | $16.62M | $233.98M | $1.04B |
| 2017-12-31 | $30.05 | 32.87M | $987.86M | $17.91M | $271.77M | $1.24B |
| 2016-12-31 | $24.52 | 33.54M | $822.33M | $17.9M | $148.12M | $952.55M |
| Date | Stock Price | Shares Outstanding | Market Cap | Cash & Equivalents | Total Debt | Enterprise Value |
|---|---|---|---|---|---|---|
| 2026-04-04 | $58.20 | 38.22M | $2.22B | $11.87M | $379.11M | $2.59B |
| 2025-12-31 | $45.20 | 38.48M | $1.74B | $18.18M | $378.35M | $2.1B |
| 2025-09-27 | $37.26 | 35.42M | $1.32B | $13.48M | $379.39M | $1.69B |
| 2025-06-28 | $27.87 | 32.85M | $915.53M | $13.46M | $195.81M | $1.1B |
| 2025-03-29 | $20.56 | 35.29M | $725.54M | $24.8M | $196.06M | $896.79M |
| 2024-12-31 | $13.30 | 35.4M | $470.82M | $9.28M | $193.87M | $655.41M |
| 2024-09-28 | $16.71 | 34.52M | $576.89M | $6.36M | $205.46M | $775.99M |
| 2024-06-29 | $16.69 | 38.32M | $639.64M | $4.39M | $201.84M | $837.1M |
| 2024-03-30 | $15.87 | 34.86M | $553.28M | $6.61M | $191.18M | $737.85M |
| 2023-12-31 | $14.52 | 34.88M | $506.46M | $11.31M | $197.88M | $693.02M |
| 2023-09-30 | $13.22 | 34.96M | $462.18M | $7.65M | $198.62M | $653.15M |
| 2023-07-01 | $16.55 | 32.61M | $539.76M | $4.29M | $208.38M | $743.85M |