Jane Street
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Jane Street’s Similarweb SMWB Stock Holding History

Jane Street’s Portfolio SMWB Stock Details SMWB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-133,800
Closed -$1M – 12891
2025
Q4 		$1M Sell
133,800
-210,000
-61% -$1.69M ﹤0.01% 6113
2025
Q3 		$3.2M Buy
343,800
+236,300
+220% +$2.12M ﹤0.01% 4110
2025
Q2 		$843K Buy
107,500
+48,600
+83% +$364K ﹤0.01% 5943
2025
Q1 		$487K Buy
+58,900
New +$726K ﹤0.01% 6909

Other funds holding SMWB

N
Naspers South Africa $253M AUM 25.32% 1-Year Est. Return
MMH
Menora Mivtachim Holdings Ramat Gan, Israel $21.1B AUM 40.03% 1-Year Est. Return
YDMI
Y.D. More Investments Ramat Gan, Israel $2.55B AUM 104.35% 1-Year Est. Return
ICP
ION Crossover Partners Herzliya Pituach, Israel $36.9M AUM
UM
Ulysses Management New York $802M AUM 5.35% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
SST
S Squared Technology New York $264M AUM 73.25% 1-Year Est. Return
CP
CenterBook Partners Greenwich, Connecticut $1.86B AUM 24.52% 1-Year Est. Return
AFT
Alpha Family Trust Los Angeles, California $206M AUM 35.6% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Jane Street's SMWB Position: Q1 2026 in Review

Jane Street increased its Similarweb (SMWB) stake by 24% in Q1 2026, buying an estimated $188K and bringing the position to 231,266 shares worth $604K. The position accounts for ﹤0.01% of the portfolio, ranked #7605.

Jane Street first reported a position in SMWB in Q4 2021 and has held it in 8 quarters since. The position peaked at $1.41M in Q3 2025. 79 funds tracked by Wall St. Rank hold SMWB as of Q1 2026.

  • Jane Street held 231,266 shares of Similarweb worth $604K as of Q1 2026.
  • Jane Street bought 45,058 Similarweb shares in Q1 2026, an estimated $188K.
  • Similarweb made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #7605 holding.
  • Jane Street first reported a position in Similarweb in Q4 2021 and has held it in 8 quarters since.
  • Jane Street's Similarweb position peaked at $1.41M in Q3 2025.
  • 79 funds tracked by Wall St. Rank held Similarweb as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.