William Blair & Company
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William Blair & Company’s Halozyme HALO Stock Holding History

William Blair & Company’s Portfolio HALO Stock Details HALO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$659K Buy
+10,203
New +$719K ﹤0.01% 1050
2024
Q4 		– Sell
-4,149
Closed -$237K – 1844
2024
Q3 		$237K Buy
4,149
+3,837
+1,230% +$220K ﹤0.01% 1380
2024
Q2 		$16.3K Buy
+312
New +$13.7K ﹤0.01% 1706
2023
Q1 		– Sell
-15,017
Closed -$854K – 1829
2022
Q4 		$854K Sell
15,017
-1,960
-12% -$100K ﹤0.01% 878
2022
Q3 		$671K Sell
16,977
-96
-0.6% -$4.24K ﹤0.01% 949
2022
Q2 		$751K Sell
17,073
-3,025
-15% -$131K ﹤0.01% 937
2022
Q1 		$802K Sell
20,098
-153
-0.8% -$5.45K ﹤0.01% 994
2021
Q4 		$814K Buy
20,251
+34
+0.2% +$1.27K ﹤0.01% 1031
2021
Q3 		$822K Buy
20,217
+765
+4% +$32K ﹤0.01% 996
2021
Q2 		$883K Sell
19,452
-1,751
-8% -$77.5K ﹤0.01% 957
2021
Q1 		$884K Sell
21,203
-3,025
-12% -$138K ﹤0.01% 940
2020
Q4 		$1.03M Sell
24,228
-2,522
-9% -$90.7K ﹤0.01% 838
2020
Q3 		$703K Sell
26,750
-1,116
-4% -$31.1K ﹤0.01% 869
2020
Q2 		$747K Buy
27,866
+1,453
+6% +$32.8K ﹤0.01% 815
2020
Q1 		$475K Buy
26,413
+4,970
+23% +$94.3K ﹤0.01% 887
2019
Q4 		$380K Buy
+21,443
New +$371K ﹤0.01% 1091
2015
Q1 		– Sell
-69,001
Closed -$665K – 2163
2014
Q4 		$665K Hold
69,001
– – ﹤0.01% 1612
2014
Q3 		$628K Hold
69,001
– – ﹤0.01% 1628
2014
Q2 		$681K Hold
69,001
– – ﹤0.01% 1572
2014
Q1 		$876K Buy
69,001
+500
+0.7% +$7.42K ﹤0.01% 1466
2013
Q4 		$1.03M Hold
68,501
– – ﹤0.01% 1384
2013
Q3 		$755K Hold
68,501
– – ﹤0.01% 1421
2013
Q2 		$544K Buy
+68,501
New +$436K ﹤0.01% 1482

Other funds holding HALO

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
William Blair Investment Management
William Blair Investment Management Chicago, Illinois $30.3B AUM 33.75% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

William Blair & Company's HALO Position: Q1 2026 in Review

William Blair & Company opened a new position in Halozyme (HALO) in Q1 2026: 10,203 shares worth $659K. The stake represents ﹤0.01% of the portfolio and ranks #1050 among its holdings. This is a return to the name: William Blair & Company previously reported a position in HALO as recently as Q3 2024.

William Blair & Company first reported a position in HALO in Q2 2013 and has held it in 23 quarters since. The position peaked at $1.03M in Q4 2020. 635 funds tracked by Wall St. Rank hold HALO as of Q1 2026.

  • William Blair & Company held 10,203 shares of Halozyme worth $659K as of Q1 2026.
  • Halozyme was a new William Blair & Company position in Q1 2026.
  • Halozyme made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #1050 holding.
  • William Blair & Company first reported a position in Halozyme in Q2 2013 and has held it in 23 quarters since.
  • William Blair & Company's Halozyme position peaked at $1.03M in Q4 2020.
  • 635 funds tracked by Wall St. Rank held Halozyme as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.