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MPM BIOIMPACT LLC

Position in RARE — Ultragenyx Pharmaceutical Inc.

CIK 1687078 BOSTON, MA

Position in RARE

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$47,354,198
+$35,451,542 QoQ
Shares Held
1,418,215
+258.4% QoQ
Ownership
1.44%
of shares outstanding
% of Portfolio
2.89%
of 13F equity value
Holder Rank
#17
of 311 holders
Holding Since
Mar 2024
8 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in RARE Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

MPM BIOIMPACT LLC holds $1,463,416,616 across 34 Biotechnology names. RARE ranks #11 (3.2% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in RARE

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8 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $47,354,198 1,418,215
2025-09-30 $11,902,656 395,700
2025-06-30 $14,387,652 395,700
2025-03-31 $14,427,693 398,445
2024-12-31 $16,450,127 391,018
2024-09-30 $18,316,668 329,733
2024-06-30 $15,640,687 380,552
2024-03-31 $11,466,597 245,590