William Blair Investment Management
NBIS

William Blair Investment Management’s Nebius Group N.V. NBIS Stock Holding History

William Blair Investment Management’s Portfolio NBIS Stock Details NBIS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-249,125
Closed -$28M – 459
2025
Q3 		$28M Buy
+249,125
New +$17.3M 0.07% 231
2022
Q1 		– Sell
-4,315,408
Closed -$261M – 461
2021
Q4 		$261M Buy
4,315,408
+91,379
+2% +$6.73M 0.71% 40
2021
Q3 		$337M Buy
4,224,029
+88,257
+2% +$6.43M 0.95% 18
2021
Q2 		$293M Buy
4,135,772
+215,121
+5% +$14.1M 0.92% 30
2021
Q1 		$251M Sell
3,920,651
-173,357
-4% -$11.6M 0.81% 34
2020
Q4 		$285M Sell
4,094,008
-120,355
-3% -$7.68M 0.95% 23
2020
Q3 		$275M Sell
4,214,363
-422,067
-9% -$25.1M 1.07% 17
2020
Q2 		$232M Buy
4,636,430
+349,529
+8% +$14M 0.94% 23
2020
Q1 		$146M Buy
4,286,901
+1,389,354
+48% +$57.3M 0.71% 44
2019
Q4 		$126M Sell
2,897,547
-1,248,889
-30% -$46.6M 0.5% 64
2019
Q3 		$145M Buy
4,146,436
+241,107
+6% +$9.1M 0.62% 54
2019
Q2 		$148M Buy
3,905,329
+692,919
+22% +$25.7M 0.62% 55
2019
Q1 		$110M Sell
3,212,410
-26,186
-0.8% -$868K 0.46% 68
2018
Q4 		$88.6M Sell
3,238,596
-25,169
-0.8% -$739K 0.44% 73
2018
Q3 		$107M Buy
3,263,765
+671,188
+26% +$22.7M 0.37% 87
2018
Q2 		$93.1M Sell
2,592,577
-3,296,614
-56% -$115M 0.35% 93
2018
Q1 		$232M Buy
5,889,191
+1,942,192
+49% +$76.2M 0.89% 20
2017
Q4 		$129M Sell
3,946,999
-682,741
-15% -$22.3M 0.5% 63
2017
Q3 		$153M Buy
4,629,740
+968,379
+26% +$29.6M 0.55% 52
2017
Q2 		$96.1M Buy
3,661,361
+625,063
+21% +$16.3M 0.35% 94
2017
Q1 		$66.6M Sell
3,036,298
-939,636
-24% -$21.4M 0.25% 122
2016
Q4 		$80M Buy
3,975,934
+176,295
+5% +$3.47M 0.32% 107
2016
Q3 		$80M Sell
3,799,639
-689,425
-15% -$15M 0.3% 110
2016
Q2 		$98.1M Buy
4,489,064
+4,217,581
+1,554% +$82M 0.39% 87
2016
Q1 		$4.16M Sell
271,483
-875,400
-76% -$12M 0.02% 363
2015
Q4 		$18M Buy
+1,146,883
New +$17.2M 0.07% 214

Other funds holding NBIS

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
FAM
Fred Alger Management New York $22.8B AUM 64.63% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
AL4A
Accel Leaders 4 Associates Palo Alto, California $475M AUM 391.52% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
CS
Clear Street New York $24.6B AUM 56.26% 1-Year Est. Return
OAG
Orbis Allan Gray Hamilton, Bermuda $23.7B AUM 65.43% 1-Year Est. Return
VARA
Value Aligned Research Advisors Princeton, New Jersey $20.7B AUM 292.88% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return

William Blair Investment Management's NBIS Position: Q4 2025 in Review

William Blair Investment Management sold out of Nebius Group N.V. (NBIS) in Q4 2025, closing a stake of 249,125 shares — an estimated $28M sold.

William Blair Investment Management first reported a position in NBIS in Q4 2015 and held it in 26 quarters. The position peaked at $337M in Q3 2021. 621 funds tracked by Wall St. Rank hold NBIS as of Q4 2025.

  • William Blair Investment Management reported no remaining Nebius Group N.V. position as of Q4 2025 after selling out during the quarter.
  • William Blair Investment Management sold 249,125 Nebius Group N.V. shares in Q4 2025, an estimated $28M.
  • William Blair Investment Management first reported a position in Nebius Group N.V. in Q4 2015 and held it in 26 quarters.
  • William Blair Investment Management's Nebius Group N.V. position peaked at $337M in Q3 2021.
  • 621 funds tracked by Wall St. Rank held Nebius Group N.V. as of Q4 2025.

Based on William Blair Investment Management's 13F filing for Q4 2025, filed 9 Feb 2026.