California State Teachers Retirement System (CalSTRS)
MBX

California State Teachers Retirement System (CalSTRS)’s MBX Biosciences MBX Stock Holding History

California State Teachers Retirement System (CalSTRS)’s Portfolio MBX Stock Details MBX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$680K Buy
22,765
+21,011
+1,198% +$715K ﹤0.01% 1950
2025
Q4 		$55.3K Buy
1,754
+689
+65% +$16.7K ﹤0.01% 2291
2025
Q3 		$18.6K Buy
1,065
+1
+0.1% +$13 ﹤0.01% 2581
2025
Q2 		$12.1K Buy
1,064
+232
+28% +$2.36K ﹤0.01% 2667
2025
Q1 		$6.14K Hold
832
– – ﹤0.01% 2885
2024
Q4 		$15.3K Buy
+832
New +$17.7K ﹤0.01% 2701

Other funds holding MBX

FLSM
Frazier Life Sciences Management Palo Alto, California $3.89B AUM 201.1% 1-Year Est. Return
O
OrbiMed New York $5.05B AUM 125.28% 1-Year Est. Return
NMC
NEA Management Company Timonium, Maryland $1.76B AUM 223.33% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
DTC
Deep Track Capital Greenwich, Connecticut $6.12B AUM 144% 1-Year Est. Return
NA
NVP Associates Menlo Park, California $176M AUM 208.78% 1-Year Est. Return
PCH
Polar Capital Holdings London, United Kingdom $28.2B AUM 115.26% 1-Year Est. Return
B
Braidwell Stamford, Connecticut $3B AUM 46.72% 1-Year Est. Return

California State Teachers Retirement System (CalSTRS)'s MBX Position: Q1 2026 in Review

California State Teachers Retirement System (CalSTRS) increased its MBX Biosciences (MBX) stake by 1,198% in Q1 2026, buying an estimated $715K and bringing the position to 22,765 shares worth $680K. The position accounts for ﹤0.01% of the portfolio, ranked #1950.

California State Teachers Retirement System (CalSTRS) first reported a position in MBX in Q4 2024 and has held it in 6 quarters since. 157 funds tracked by Wall St. Rank hold MBX as of Q1 2026.

  • California State Teachers Retirement System (CalSTRS) held 22,765 shares of MBX Biosciences worth $680K as of Q1 2026.
  • California State Teachers Retirement System (CalSTRS) bought 21,011 MBX Biosciences shares in Q1 2026, an estimated $715K.
  • MBX Biosciences made up ﹤0.01% of California State Teachers Retirement System (CalSTRS)'s portfolio in Q1 2026, its #1950 holding.
  • California State Teachers Retirement System (CalSTRS) first reported a position in MBX Biosciences in Q4 2024 and has held it in 6 quarters since.
  • 157 funds tracked by Wall St. Rank held MBX Biosciences as of Q1 2026.

Based on California State Teachers Retirement System (CalSTRS)'s 13F filing for Q1 2026, filed 18 May 2026.