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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+4.79%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$179B
AUM Growth
+$8.24B
Cap. Flow
+$1.08B
Cap. Flow %
0.6%
Top 10 Hldgs %
48.72%
Holding
10,008
New
1,520
Increased
3,222
Reduced
3,616
Closed
1,504

Top Buys

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$552M
2
MSTR icon
Strategy Inc
MSTR
+$85.8M
3
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
+$48.1M
4
INTC icon
Intel
INTC
+$45.4M
5
UBER icon
Uber
UBER
+$43M

Top Sells

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$133M
2
PDD icon
Pinduoduo
PDD
+$82.6M
3
BA icon
Boeing
BA
+$49.8M
4
KWEB icon
KraneShares CSI China Internet ETF
KWEB
+$45.1M
5
MSFT icon
Microsoft
MSFT
+$41M

Sector Composition

Rank Sector Weight
1 Technology 0.68%
2 Consumer Discretionary 0.23%
3 Healthcare 0.19%
4 Financials 0.13%
5 Communication Services 0.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VOYA icon
9726
CALL
Voya Financial
VOYA
$8.94B
– –
-57,300
Closed -$4.54M
VPG icon
9727
Vishay Precision Group
VPG
$1.5B
– –
-200
Closed -$4.68K
VPU
9728
Vanguard Utilities ETF
VPU
$8.73B
– –
-360
Closed -$62K
VRCA icon
9729
CALL
Verrica Pharmaceuticals
VRCA
$94.5M
– –
-2,040
Closed -$29K
VRDN icon
9730
Viridian Therapeutics
VRDN
$2.08B
– –
-911
Closed -$19.8K
VRRM icon
9731
CALL
Verra Mobility
VRRM
$624M
– –
-43,800
Closed -$1.22M
VRRM icon
9732
PUT
Verra Mobility
VRRM
$624M
– –
-100
Closed -$2K
VSAT icon
9733
Viasat
VSAT
$10.3B
– –
-6,232
Closed -$59.9K
VTOL icon
9734
Bristow Group
VTOL
$1.34B
– –
-33
Closed -$1K
VVV icon
9735
PUT
Valvoline
VVV
$4.98B
– –
-1,100
Closed -$46K
VXX icon
9736
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$156M
– –
-10,325
Closed -$499K
VYM icon
9737
Vanguard High Dividend Yield ETF
VYM
$80.8B
– –
-7,944
Closed -$1.02M
WAFD icon
9738
PUT
WaFd
WAFD
$2.7B
– –
-400
Closed -$13K
WASH icon
9739
CALL
Washington Trust Bancorp
WASH
$723M
– –
-100
Closed -$3K
WBX
9740
CALL
Wallbox
WBX
$94.1M
– –
-345
Closed -$8K
WD icon
9741
PUT
Walker & Dunlop
WD
$1.62B
– –
-9,800
Closed -$1.11M
WDAY icon
9742
Workday
WDAY
$33.4B
– –
-40,042
Closed -$10.2M
WDFC icon
9743
WD-40
WDFC
$3.16B
– –
-1,889
Closed -$503K
WEAV icon
9744
Weave Communications
WEAV
$498M
– –
-1,744
Closed -$24.5K
WEBS icon
9745
Direxion Daily Dow Jones Internet Bear 3X ETF
WEBS
$8.41M
– –
-16
Closed –
WEC icon
9746
WEC Energy
WEC
$36.8B
– –
-18,777
Closed -$1.82M
WERN icon
9747
CALL
Werner Enterprises
WERN
$2.77B
– –
-100
Closed -$3K
WERN icon
9748
Werner Enterprises
WERN
$2.77B
– –
-422
Closed -$16K
WERN icon
9749
PUT
Werner Enterprises
WERN
$2.77B
– –
-600
Closed -$23K
WEX icon
9750
WEX
WEX
$5.46B
$0 ﹤0.01%
2
-1,080
-100% -$203K
388 389
390
391 392

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Simplex Trading's Q4 2024 Portfolio in Review

As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.

Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.

By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
  • Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
  • Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
  • Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
  • Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
  • Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
  • Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.

Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.