Paul Yoonku Cho

Companies

• Keystone Acquisition Corp.Board member Jun 2, 2026 to now¹
• Ultra Clean Holdings, Inc.General counsel Oct 21, 2019 to now²

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• UCUltra Clean Holdings, Inc. UCTT22,941 shares³$1.2M at $53.26Jun 2, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Jun 2, 2026Sold 944 shares at $89.37 of Ultra Clean Holdings, Inc.³
• May 22, 2026Granted 8,041 shares of Ultra Clean Holdings, Inc.⁴
• May 8, 2026Sold 2,000 shares at $86.89 of Ultra Clean Holdings, Inc.⁵
• Apr 30, 2026Shares withheld for tax 2,454 shares at $78.15 of Ultra Clean Holdings, Inc.⁶
• Apr 30, 2026Shares withheld for tax 1,465 shares at $78.15 of Ultra Clean Holdings, Inc.⁶
• Apr 30, 2026Shares withheld for tax 1,582 shares at $78.15 of Ultra Clean Holdings, Inc.⁶
• Jun 6, 2025Sold 4,084 shares at $21.06 of Ultra Clean Holdings, Inc.⁷
• Apr 30, 2025Shares withheld for tax 995 shares at $18.71 of Ultra Clean Holdings, Inc.⁸
• Apr 30, 2025Shares withheld for tax 1,462 shares at $18.71 of Ultra Clean Holdings, Inc.⁸
• Apr 30, 2025Shares withheld for tax 1,579 shares at $18.71 of Ultra Clean Holdings, Inc.⁸
• Apr 25, 2025Granted 14,472 shares of Ultra Clean Holdings, Inc.⁹
• Mar 31, 2025Shares withheld for tax 173 shares at $21.41 of Ultra Clean Holdings, Inc.¹⁰
• May 17, 2024Sold 3,449 shares at $44.79 of Ultra Clean Holdings, Inc.¹¹
• Apr 30, 2024Shares withheld for tax 1,576 shares at $41.83 of Ultra Clean Holdings, Inc.¹²
• Apr 30, 2024Shares withheld for tax 614 shares at $41.83 of Ultra Clean Holdings, Inc.¹²
• Apr 30, 2024Shares withheld for tax 993 shares at $41.83 of Ultra Clean Holdings, Inc.¹²
• Apr 26, 2024Granted 8,644 shares of Ultra Clean Holdings, Inc.¹³
• Mar 31, 2024Shares withheld for tax 173 shares at $45.94 of Ultra Clean Holdings, Inc.¹⁴
• Mar 31, 2024Shares withheld for tax 183 shares at $45.94 of Ultra Clean Holdings, Inc.¹⁴
• Mar 31, 2024Granted 363 shares of Ultra Clean Holdings, Inc.¹⁴
• Dec 4, 2023Sold 4,689 shares at $28.38 of Ultra Clean Holdings, Inc.¹⁵
• May 26, 2023Sold 176 shares at $36.10 of Ultra Clean Holdings, Inc.¹⁶
• Apr 30, 2023Shares withheld for tax 951 shares at $28.54 of Ultra Clean Holdings, Inc.¹⁷
• Apr 30, 2023Shares withheld for tax 235 shares at $28.54 of Ultra Clean Holdings, Inc.¹⁷
• Apr 30, 2023Shares withheld for tax 588 shares at $28.54 of Ultra Clean Holdings, Inc.¹⁷