Parnassus Investments’s Biogen BIIB Stock Holding History

Parnassus Investments’s Portfolio BIIB Stock Details BIIB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2024 Q4	–	Sell	-361,512	Closed	-$70.1M	–	129
2024 Q3	$70.1M	Buy	361,512 +770	+0.2%	+$161K	0.15%	87
2024 Q2	$83.6M	Hold	360,742	–	–	0.18%	75
2024 Q1	$77.8M	Hold	360,742	–	–	0.17%	87
2023 Q4	$93.3M	Hold	360,742	–	–	0.21%	86
2023 Q3	$92.7M	Buy	360,742 +54,934	+18%	+$14.7M	0.23%	80
2023 Q2	$87.1M	Hold	305,808	–	–	0.2%	86
2023 Q1	$85M	Hold	305,808	–	–	0.21%	85
2022 Q4	$84.7M	Sell	305,808 -41,943	-12%	-$11.8M	0.21%	88
2022 Q3	$92.8M	Sell	347,751 -104,302	-23%	-$22.2M	0.24%	74
2022 Q2	$92.2M	Hold	452,053	–	–	0.22%	85
2022 Q1	$95.2M	Hold	452,053	–	–	0.19%	95
2021 Q4	$108M	Hold	452,053	–	–	0.21%	89
2021 Q3	$128M	Hold	452,053	–	–	0.27%	75
2021 Q2	$157M	Buy	452,053 +137,641	+44%	+$41.7M	0.34%	66
2021 Q1	$88M	Buy	+314,412	New	+$84.8M	0.21%	87
2019 Q4	–	Sell	-574,416	Closed	-$134M	–	97
2019 Q3	$134M	Sell	574,416 -350,584	-38%	-$81.6M	0.48%	54
2019 Q2	$216M	Buy	925,000 +295,000	+47%	+$68.1M	0.82%	42
2019 Q1	$149M	Buy	630,000 +280,000	+80%	+$88.2M	0.59%	44
2018 Q4	$105M	Buy	350,000 +295,000	+536%	+$94.1M	0.46%	54
2018 Q3	$19.4M	Hold	55,000	–	–	0.07%	79
2018 Q2	$16M	Buy	+55,000	New	+$15.5M	0.06%	80

Other funds holding BIIB

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

Pacer Advisors Malvern, Pennsylvania $35.6B AUM 18.19% 1-Year Est. Return

Norges Bank Oslo, Norway $935B AUM

Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return

Parnassus Investments's BIIB Position: Q4 2024 in Review

Parnassus Investments sold out of Biogen (BIIB) in Q4 2024, closing a stake of 361,512 shares — an estimated $70.1M sold.

Parnassus Investments first reported a position in BIIB in Q2 2018 and held it in 21 quarters. The position peaked at $216M in Q2 2019. 874 funds tracked by Wall St. Rank hold BIIB as of Q4 2024.

Parnassus Investments reported no remaining Biogen position as of Q4 2024 after selling out during the quarter.
Parnassus Investments sold 361,512 Biogen shares in Q4 2024, an estimated $70.1M.
Parnassus Investments first reported a position in Biogen in Q2 2018 and held it in 21 quarters.
Parnassus Investments's Biogen position peaked at $216M in Q2 2019.
874 funds tracked by Wall St. Rank held Biogen as of Q4 2024.

Based on Parnassus Investments's 13F filing for Q4 2024, filed 10 Feb 2025.