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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WAL icon
10051
Western Alliance Bancorporation
WAL
$9.11B
– –
-229,321
Closed -$7.95M
WATT icon
10052
Energous
WATT
$84.8M
– –
-2
Closed -$427
WCN
10053
Waste Connections
WCN
$42.7B
– –
-263
Closed -$36.7K
WDAY icon
10054
Workday
WDAY
$32.7B
– –
-46,328
Closed -$9.28M
WDC icon
10055
Western Digital
WDC
$192B
– –
-115,419
Closed -$3.21M
WERN icon
10056
Werner Enterprises
WERN
$2.75B
– –
-49
Closed -$2.2K
WEST icon
10057
Westrock Coffee
WEST
$755M
$0 ﹤0.01%
1
– –
WHR icon
10058
Whirlpool
WHR
$2.41B
– –
-7,747
Closed -$1.06M
WIT icon
10059
Wipro
WIT
$17.9B
– –
-152
Closed -$353
WKEY
10060
WISeKey
WKEY
$75.9M
$0 ﹤0.01%
+69
New +$393
WKEY
10061
PUT
WISeKey
WKEY
$75.9M
– –
-920
Closed -$4K
WLKP icon
10062
Westlake Chemical Partners
WLKP
$777M
– –
-363
Closed -$7.94K
WMK icon
10063
Weis Markets
WMK
$1.93B
– –
-81
Closed -$6K
WMK icon
10064
PUT
Weis Markets
WMK
$1.93B
– –
-200
Closed -$16K
WMT icon
10065
Walmart Inc
WMT
$870B
– –
-918,957
Closed -$46.4M
WOW
10066
CALL
DELISTED
WideOpenWest
WOW
– –
-100
Closed -$1K
WOW
10067
DELISTED
WideOpenWest
WOW
– –
-1,291
Closed -$11.7K
WOW
10068
PUT
DELISTED
WideOpenWest
WOW
– –
-1,200
Closed -$12K
WPP icon
10069
PUT
WPP
WPP
$3.95B
– –
-5,100
Closed -$303K
WRAP icon
10070
PUT
Wrap Technologies
WRAP
$99.2M
– –
-4,900
Closed -$8K
WT icon
10071
CALL
WisdomTree
WT
$3.05B
– –
-2,700
Closed -$15K
WTFC icon
10072
Wintrust Financial
WTFC
$10.7B
– –
-151
Closed -$10.3K
WTFC icon
10073
PUT
Wintrust Financial
WTFC
$10.7B
– –
-200
Closed -$14K
WTTR icon
10074
Select Water Solutions
WTTR
$2.65B
– –
-4,085
Closed -$30.9K
WULF icon
10075
TeraWulf
WULF
$9.66B
– –
-22,900
Closed -$34.9K
401 402
403
404 405

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.