Calamos Advisors
AVTR icon

Calamos Advisors’s Avantor AVTR Stock Holding History

Calamos Advisors’s Portfolio AVTR Stock Details AVTR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$301K Buy
+38,401
New +$378K ﹤0.01% 1004
2022
Q3 		– Sell
-260,972
Closed -$8.12M – 1287
2022
Q2 		$8.12M Buy
+260,972
New +$8.15M 0.04% 560

Other funds holding AVTR

Dodge & Cox
Dodge & Cox San Francisco, California $182B AUM 14.68% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
GA
Greenhaven Associates Purchase, New York $6.07B AUM 11.2% 1-Year Est. Return
Barrow, Hanley, Mewhinney & Strauss
Barrow, Hanley, Mewhinney & Strauss Dallas, Texas $30.5B AUM 29.95% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
ECM
Engine Capital Management New York $828M AUM 6.49% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Calamos Advisors's AVTR Position: Q1 2026 in Review

Calamos Advisors opened a new position in Avantor (AVTR) in Q1 2026: 38,401 shares worth $301K. The stake represents ﹤0.01% of the portfolio and ranks #1004 among its holdings. This is a return to the name: Calamos Advisors previously reported a position in AVTR as recently as Q2 2022.

Calamos Advisors first reported a position in AVTR in Q2 2022 and has held it in 2 quarters since. The position peaked at $8.12M in Q2 2022. 429 funds tracked by Wall St. Rank hold AVTR as of Q1 2026.

  • Calamos Advisors held 38,401 shares of Avantor worth $301K as of Q1 2026.
  • Avantor was a new Calamos Advisors position in Q1 2026.
  • Avantor made up ﹤0.01% of Calamos Advisors's portfolio in Q1 2026, its #1004 holding.
  • Calamos Advisors first reported a position in Avantor in Q2 2022 and has held it in 2 quarters since.
  • Calamos Advisors's Avantor position peaked at $8.12M in Q2 2022.
  • 429 funds tracked by Wall St. Rank held Avantor as of Q1 2026.

Based on Calamos Advisors's 13F filing for Q1 2026, filed 4 May 2026.