William Blair & Company
SSO icon

William Blair & Company’s ProShares Ultra S&P500 SSO Stock Holding History

William Blair & Company’s Portfolio SSO Stock Details SSO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$1.18M Sell
22,703
-427
-2% -$24.4K ﹤0.01% 889
2025
Q4 		$1.34M Buy
23,130
+5,374
+30% +$307K ﹤0.01% 856
2025
Q3 		$995K Buy
17,756
+742
+4% +$38.7K ﹤0.01% 921
2025
Q2 		$831K Hold
17,014
– – ﹤0.01% 952
2025
Q1 		$704K Buy
17,014
+944
+6% +$43.5K ﹤0.01% 980
2024
Q4 		$743K Buy
16,070
+3,598
+29% +$169K ﹤0.01% 987
2024
Q3 		$562K Sell
12,472
-520
-4% -$21.9K ﹤0.01% 1083
2024
Q2 		$537K Sell
12,992
-3,112
-19% -$120K ﹤0.01% 1072
2024
Q1 		$624K Buy
16,104
+1,784
+12% +$63.1K ﹤0.01% 1031
2023
Q4 		$466K Buy
14,320
+372
+3% +$10.7K ﹤0.01% 1091
2023
Q3 		$372K Buy
13,948
+1,148
+9% +$33.3K ﹤0.01% 1148
2023
Q2 		$372K Hold
12,800
– – ﹤0.01% 1167
2023
Q1 		$321K Buy
12,800
+10,020
+360% +$240K ﹤0.01% 1213
2022
Q4 		$61.8K Sell
2,780
-450
-14% -$10.2K ﹤0.01% 1550
2022
Q3 		$64K Sell
3,230
-1,702
-35% -$42.1K ﹤0.01% 1566
2022
Q2 		$111K Sell
4,932
-184
-4% -$4.93K ﹤0.01% 1523
2022
Q1 		$168K Sell
5,116
-60
-1% -$1.92K ﹤0.01% 1559
2021
Q4 		$189K Buy
5,176
+4,196
+428% +$144K ﹤0.01% 1596
2021
Q3 		$29K Sell
980
-288
-23% -$9.1K ﹤0.01% 1745
2021
Q2 		$38K Sell
1,268
-300
-19% -$8.49K ﹤0.01% 1720
2021
Q1 		$40K Hold
1,568
– – ﹤0.01% 1685
2020
Q4 		$36K Hold
1,568
– – ﹤0.01% 1653
2020
Q3 		$29K Sell
1,568
-1,160
-43% -$20.9K ﹤0.01% 1554
2020
Q2 		$43K Buy
2,728
+1,832
+204% +$25.9K ﹤0.01% 1463
2020
Q1 		$10K Buy
+896
New +$15.1K ﹤0.01% 1560
2014
Q4 		– Sell
-31,200
Closed -$229K – 2143
2014
Q3 		$229K Sell
31,200
-2,400
-7% -$17.7K ﹤0.01% 1924
2014
Q2 		$243K Sell
33,600
-12,000
-26% -$81.5K ﹤0.01% 1883
2014
Q1 		$300K Sell
45,600
-2,800
-6% -$17.7K ﹤0.01% 1765
2013
Q4 		$310K Sell
48,400
-6,400
-12% -$37.5K ﹤0.01% 1727
2013
Q3 		$289K Sell
54,800
-12,000
-18% -$62.8K ﹤0.01% 1733
2013
Q2 		$320K Buy
+66,800
New +$322K ﹤0.01% 1642

Other funds holding SSO

MSG
Main Street Group Glen Allen, Virginia $429M AUM 34.03% 1-Year Est. Return
PRS
Pinkerton Retirement Specialists Coeur D Alene, Idaho $1.16B AUM 28.78% 1-Year Est. Return
SWM
Spire Wealth Management Mclean, Virginia $3.31B AUM 38.78% 1-Year Est. Return
VCM
Virtue Capital Management Brentwood, Tennessee $657M AUM 24.18% 1-Year Est. Return
RCM
Ridgepath Capital Management Knoxville, Tennessee $201M AUM 10.5% 1-Year Est. Return
AMG
Asset Management Group Stamford, Connecticut $619M AUM 15.97% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
TI
TTP Investments San Jose, California $247M AUM 74.49% 1-Year Est. Return
BCM
Brookstone Capital Management Wheaton, Illinois $9.99B AUM 23.61% 1-Year Est. Return
HighTower Advisors
HighTower Advisors Chicago, Illinois $94.2B AUM 21.24% 1-Year Est. Return

William Blair & Company's SSO Position: Q1 2026 in Review

William Blair & Company reduced its ProShares Ultra S&P500 (SSO) stake by 1.8% in Q1 2026, selling an estimated $24.4K and leaving 22,703 shares worth $1.18M. The position accounts for ﹤0.01% of the portfolio, ranked #889.

William Blair & Company first reported a position in SSO in Q2 2013 and has held it in 31 quarters since. The position peaked at $1.34M in Q4 2025. 213 funds tracked by Wall St. Rank hold SSO as of Q1 2026.

  • William Blair & Company held 22,703 shares of ProShares Ultra S&P500 worth $1.18M as of Q1 2026.
  • William Blair & Company sold 427 ProShares Ultra S&P500 shares in Q1 2026, an estimated $24.4K.
  • ProShares Ultra S&P500 made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #889 holding.
  • William Blair & Company first reported a position in ProShares Ultra S&P500 in Q2 2013 and has held it in 31 quarters since.
  • William Blair & Company's ProShares Ultra S&P500 position peaked at $1.34M in Q4 2025.
  • 213 funds tracked by Wall St. Rank held ProShares Ultra S&P500 as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.