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Position history for LOOMIS SAYLES & CO L PLOOMIS SAYLES & CO L P's holdings in ALNYLAM PHARMACEUTICALS INC

Yes. Loomis Sayles holds 580,187 shares of ALNY (Alnylam Pharmaceuticals), worth $174.7M, as of its Q2 2026 13F filing. It increased the position by 68,090 shares (+13.3%) from Q1 2026. Loomis Sayles has held ALNY since Q2 2021, across 21 quarterly 13F filings. ALNY is 0.2% of Loomis Sayles' reported 13F portfolio.

Current Value

$174.7M

Current Shares

580,187

Total Value Change

+$30.2M

Total Shares Change

+54,884

Quarter-by-Quarter History
QuarterActionSharesChangeValueWeightPriceConviction
2026-Q2
Latest
Increased
580,187
+13.3%
$174.7M0.2%$301.03
41
2026-Q1
Increased
512,097
+4.8%
$169.4M0.2%$330.87
38
2025-Q4
Decreased
488,897
-2.4%
$194.4M0.2%$397.65
0
2025-Q3
Increased
500,672
+2.7%
$228.3M0.3%$456.00
38
2025-Q2
Decreased
487,328
-2.0%
$158.9M0.2%$326.09
0
2025-Q1
Decreased
497,484
-1.1%
$134.3M0.2%$270.02
0
2024-Q4
Decreased
503,045
-4.2%
$118.4M0.1%$235.31
0
2024-Q3
Decreased
525,303
-7.7%
$144.5M0.2%$275.03
0

Other major holders of ALNY: FMR LLC, Capital World Investors, VANGUARD GROUP INC

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