Koefoed William A, CFO of OneStream Inc. ($OS), sold shares on the open market seven times in the last year, totaling nearly $2.8 million. His most recent sale occurred on December 15, 2025. These transactions rank 2,847th among 11,678 insiders by sale value, below the average of $8.6 million across about 6.4 transactions per insider. Koefoed made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 15, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 9571 | $17.73 | 206,127.0000 | 242,755,313 | 4.44% | 0.00% |
| Dec. 10, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | F | Class A Common Stock | 6285 | $18.38 | 215,698.0000 | 242,755,313 | 2.83% | 0.00% |
| Sept. 15, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 8943 | $19.03 | 221,983.0000 | 236,510,211 | 3.87% | 0.00% |
| Sept. 10, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | F | Class A Common Stock | 6913 | $19.79 | 230,926.0000 | 236,510,211 | 2.91% | 0.00% |
| July 25, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Class A Common Stock | 25000 | $10.65 | 262,839.0000 | 236,510,211 | 10.51% | 0.01% |
| July 25, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 25000 | $25.00 | 237,839.0000 | 236,510,211 | 9.51% | 0.01% |
| July 25, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Stock Option (right to buy) | 25000 | $0.00 | 170,481.0000 | 236,510,211 | 12.79% | 0.01% |
| June 25, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Class A Common Stock | 25000 | $10.65 | 262,839.0000 | 236,510,211 | 10.51% | 0.01% |
| June 25, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 25000 | $26.77 | 237,839.0000 | 236,510,211 | 9.51% | 0.01% |
| June 25, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Stock Option (right to buy) | 25000 | $0.00 | 195,481.0000 | 236,510,211 | 11.34% | 0.01% |
| June 16, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 9354 | $27.90 | 237,839.0000 | 236,510,211 | 3.78% | 0.00% |
| June 11, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 6501 | $28.23 | 247,193.0000 | 236,510,211 | 2.56% | 0.00% |
| May 27, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 25000 | $28.76 | 253,694.0000 | 236,510,211 | 8.97% | 0.01% |
| May 27, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Stock Option (right to buy) | 25000 | $0.00 | 220,481.0000 | 236,510,211 | 10.18% | 0.01% |
| May 27, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Class A Common Stock | 25000 | $10.65 | 278,694.0000 | 236,510,211 | 9.85% | 0.01% |
| March 10, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | A | Class A Common Stock | 253694 | $0.00 | 253,694.0000 | 236,510,211 | 9999.99% | 0.11% |
| Feb. 18, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Class A Common Stock | 10000 | $10.65 | 10,000.0000 | 236,510,211 | 9999.99% | 0.00% |
| Feb. 18, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 10000 | $25.04 | 0.0000 | 236,510,211 | 100.00% | 0.00% |
| Feb. 18, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Stock Option (right to buy) | 10000 | $0.00 | 245,481.0000 | 236,510,211 | 3.91% | 0.00% |
| Jan. 15, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Class A Common Stock | 10000 | $10.65 | 10,000.0000 | 236,510,211 | 9999.99% | 0.00% |
| Jan. 15, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Stock Option (right to buy) | 10000 | $0.00 | 255,481.0000 | 236,510,211 | 3.77% | 0.00% |
| Jan. 15, 2025 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 10000 | $26.57 | 0.0000 | 236,510,211 | 100.00% | 0.00% |
| Dec. 13, 2024 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Stock Option (right to buy) | 3765 | $0.00 | 435,685.0000 | 0 | 0.86% | 0.00% |
| Dec. 13, 2024 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Class A Common Stock | 13765 | $10.65 | 13,765.0000 | 0 | 9999.99% | 0.00% |
| Dec. 13, 2024 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 7569 | $29.57 | 6,196.0000 | 0 | 54.99% | 0.00% |
| Dec. 13, 2024 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 6196 | $30.52 | 0.0000 | 0 | 100.00% | 0.00% |
| Dec. 13, 2024 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | M | Stock Option (right to buy) | 10000 | $0.00 | 265,481.0000 | 0 | 3.63% | 0.00% |
| July 25, 2024 | OneStream, Inc. | $OS | Koefoed William A | Chief Financial Officer | S | Class A Common Stock | 20000 | $18.85 | 0.0000 | 0 | 100.00% | 0.00% |