Calamos Advisors’s Halozyme HALO Stock Holding History

Calamos Advisors’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 Q2	$3.37M	Sell	43,000 -30,600	-42%	-$2.09M	0.01%	598
2026 Q1	$4.76M	Sell	73,600 -1,400	-2%	-$98.7K	0.02%	565
2025 Q4	$5.05M	Buy	75,000 +22,000	+42%	+$1.48M	0.02%	525
2025 Q3	$3.89M	Buy	+53,000	New	+$3.52M	0.01%	571
2024 Q4	–	Sell	-32,349	Closed	-$1.85M	–	929
2024 Q3	$1.85M	Sell	32,349 -11,619	-26%	-$666K	0.01%	625
2024 Q2	$2.3M	Buy	+43,968	New	+$1.93M	0.01%	584
2023 Q1	–	Sell	-18,354	Closed	-$1.04M	–	1166
2022 Q4	$1.04M	Sell	18,354 -12,697	-41%	-$650K	﹤0.01%	853
2022 Q3	$1.23M	Sell	31,051 -69,673	-69%	-$3.08M	0.01%	922
2022 Q2	$4.43M	Buy	+100,724	New	+$4.36M	0.02%	756
2021 Q2	–	Sell	-64,359	Closed	-$2.68M	–	979
2021 Q1	$2.68M	Sell	64,359 -53,357	-45%	-$2.44M	0.01%	651
2020 Q4	$5.03M	Buy	117,716 +21,545	+22%	+$774K	0.03%	494
2020 Q3	$2.53M	Buy	96,171 +49,468	+106%	+$1.38M	0.02%	565
2020 Q2	$1.25M	Buy	+46,703	New	+$1.05M	0.01%	622

Other funds holding HALO

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return

LSV Asset Management Chicago, Illinois $55.1B AUM 45.38% 1-Year Est. Return

SIMG

Stephens Investment Management Group Houston, Texas $9.33B AUM 56.1% 1-Year Est. Return

CAM

Congress Asset Management Boston, Massachusetts $16.3B AUM 42.69% 1-Year Est. Return

TD Asset Management Toronto, Ontario, Canada $115B AUM 41.58% 1-Year Est. Return

BTW

Boston Trust Walden Boston, Massachusetts $13.1B AUM 24.63% 1-Year Est. Return

Assenagon Asset Management Senningerberg, Luxembourg $80.2B AUM 50.57% 1-Year Est. Return

MMC

Mizuho Markets Cayman Grand Cayman, Cayman Islands $2.67B AUM 103.47% 1-Year Est. Return

Calamos Advisors's HALO Position: Q2 2026 in Review

Calamos Advisors reduced its Halozyme (HALO) stake by 42% in Q2 2026, selling an estimated $2.09M and leaving 43,000 shares worth $3.37M. The position accounts for 0.01% of the portfolio, ranked #598.

Calamos Advisors first reported a position in HALO in Q2 2020 and has held it in 13 quarters since. The position peaked at $5.05M in Q4 2025. 342 funds tracked by Wall St. Rank hold HALO as of Q2 2026.

Calamos Advisors held 43,000 shares of Halozyme worth $3.37M as of Q2 2026.
Calamos Advisors sold 30,600 Halozyme shares in Q2 2026, an estimated $2.09M.
Halozyme made up 0.01% of Calamos Advisors's portfolio in Q2 2026, its #598 holding.
Calamos Advisors first reported a position in Halozyme in Q2 2020 and has held it in 13 quarters since.
Calamos Advisors's Halozyme position peaked at $5.05M in Q4 2025.
342 funds tracked by Wall St. Rank held Halozyme as of Q2 2026.

Based on Calamos Advisors's 13F filing for Q2 2026, filed 31 Jul 2026.