Thomas L. Harrison serves as Executive at OMNICOM GROUP INC, where they oversee executive responsibilities. Since joining the company, Thomas L. Harrison has executed 36 insider transactions totaling $3.7M, demonstrating a bearish approach to their equity position. Their most recent transaction on Nov 20, 2025 involved receiving (via award) 5,474 shares valued at $15.0K.
Thomas L. Harrison currently holds 24,539 shares of OMNICOM GROUP INC (OMC), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, Thomas L. Harrison has been a net seller of OMC stock. They have purchased $466.0K and sold $3.2M worth of shares.
Thomas L. Harrison's most recent insider trade was on Nov 20, 2025, when they sold 5,474 shares at $2.74 per share.
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| $5.01 |
| Discretionary |
| Jul 1, 2025 | AGEN | $25.6K | Award | 7,401 | $3.46 | Discretionary |
| Jan 24, 2024 | AFCG | $15.0K | Award | 1,282 | $11.70 | Discretionary |
| Jan 3, 2023 | AFCG | $15.0K | Award | 963 | $15.57 | Discretionary |
| Mar 23, 2021 | AFCG | $95.0K | Purchase | 5,000 | $19.00 | Discretionary |
| Dec 8, 2017 | FSAM | $24.3K | Sale | 6,000 | $4.05 | Discretionary |
| Nov 30, 2017 | FSAM | $65.6K | Option Exercise | 20,000 | $3.28 | Discretionary |
| Nov 30, 2017 | FSAM | $81.4K | Sale | 20,000 | $4.07 | Discretionary |
| Nov 30, 2017 | FSAM | $65.6K | Option Exercise | 20,000 | $3.28 | Discretionary |
| Nov 30, 2017 | FSAM | $81.4K | Sale | 20,000 | $4.07 | Discretionary |
| Aug 10, 2015 | ZYNE | $175.0K | Purchase | 12,500 | $14.00 | Discretionary |
| Nov 4, 2014 | FSAM | $102.0K | Purchase | 6,000 | $17.00 | Discretionary |
| Mar 18, 2014 | DPRX | $24.0K | Purchase | 2,000 | $12.00 | Discretionary |
| Dec 3, 2013 | RVUE | $0 | Award | 500,000 | $N/A | Discretionary |
| Dec 3, 2013 | RVUE | $70.0K | Purchase | 1,000,000 | $0.07 | Discretionary |
| May 17, 2012 | MHGC | $0 | Award | 10,822 | $N/A | Discretionary |
| May 19, 2011 | MHGC | $0 | Award | 6,045 | $N/A | Discretionary |
| May 20, 2010 | MHGC | $0 | Award | 8,305 | $N/A | Discretionary |
| Mar 31, 2010 | OMC | $0 | Award | 12,636 | $N/A | Discretionary |
| Aug 14, 2009 | MHGC | $0 | Award | 10,080 | $N/A | Discretionary |
| Jun 30, 2008 | OMC | $0 | Award | 4,000 | $N/A | Discretionary |
| Nov 1, 2007 | OMC | $71.1K | Sale | 1,400 | $50.80 | Discretionary |
| Nov 1, 2007 | OMC | $101.6K | Sale | 2,000 | $50.78 | Discretionary |
| Nov 1, 2007 | OMC | $25.4K | Sale | 500 | $50.75 | Discretionary |
| Nov 1, 2007 | OMC | $50.7K | Sale | 1,000 | $50.70 | Discretionary |
| Nov 1, 2007 | OMC | $5.1K | Sale | 100 | $50.69 | Discretionary |
| Nov 1, 2007 | OMC | $1.3M | Option Exercise | 60,000 | $21.34 | Discretionary |
| Nov 1, 2007 | OMC | $2.7M | Sale | 53,800 | $50.30 | Discretionary |
| Nov 1, 2007 | OMC | $10.1K | Sale | 200 | $50.37 | Discretionary |