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Company

Upstream Bio, Inc.

UPB · CIK 0002022626

SEC FORM 4
$2,662.65

Upstream Bio, Inc. (UPB)

Sale of 485 shares at $5.49 per share.

Reporting Person Ambrose Allison · Officer Title General Counsel · Transaction Code S

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0001193125-26-394318 · filed 2026-09-17 · View filing →

SEC FORM 4
$4,682.97

Upstream Bio, Inc. (UPB)

Sale of 853 shares at $5.49 per share.

Reporting Person GRAY MICHAEL · Officer Title CFO and COO · Transaction Code S

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0001193125-26-394322 · filed 2026-09-17 · View filing →

SEC FORM 4
$3,843.00

Upstream Bio, Inc. (UPB)

Sale of 700 shares at $5.49 per share.

Reporting Person Houghton Adam · Officer Title Chief Business Officer · Transaction Code S

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0001193125-26-394324 · filed 2026-09-17 · View filing →

SEC FORM 4
$11,501.55

Upstream Bio, Inc. (UPB)

Sale of 2,095 shares at $5.49 per share.

Reporting Person Sutherland Everett Rand · Officer Title Chief Executive Officer · Transaction Code S

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0001193125-26-394325 · filed 2026-09-17 · View filing →

SEC FORM 4
$4,913.55

Upstream Bio, Inc. (UPB)

Sale of 895 shares at $5.49 per share.

Reporting Person Deykin Aaron · Officer Title Chief Medical Officer · Transaction Code S

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0001193125-26-394330 · filed 2026-09-17 · View filing →