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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
WVE icon
10076
CALL
Wave Life Sciences
WVE
$1.1B
– –
-400
Closed -$1K
WWD icon
10077
CALL
Woodward
WWD
$24.1B
– –
-500
Closed -$48K
WYY icon
10078
WidePoint Corp
WYY
$113M
– –
-189
Closed –
XAR icon
10079
State Street SPDR S&P Aerospace & Defense ETF
XAR
$5.97B
– –
-100
Closed -$11K
XBIO icon
10080
Xenetic Biosciences
XBIO
$6.12M
– –
-136
Closed –
XGN icon
10081
Exagen
XGN
$119M
– –
-235
Closed –
XLB icon
10082
State Street Materials Select Sector SPDR ETF
XLB
$8.43B
– –
-224,914
Closed -$8.94M
XNCR icon
10083
Xencor
XNCR
$1.45B
– –
-325
Closed -$8.84K
XNCR icon
10084
PUT
Xencor
XNCR
$1.45B
– –
-300
Closed -$8K
XNET
10085
Xunlei
XNET
$360M
– –
-11,140
Closed -$18.4K
XOS icon
10086
CALL
Xos
XOS
$29.4M
– –
-213
Closed -$3K
XP icon
10087
XP
XP
$8.94B
– –
-134,893
Closed -$2.29M
XPRO icon
10088
CALL
Expro Ltd
XPRO
$1.79B
– –
-700
Closed -$12K
XRT icon
10089
State Street SPDR S&P Retail ETF
XRT
$373M
– –
-73,045
Closed -$4.63M
XSW icon
10090
State Street SPDR S&P Software & Services ETF
XSW
$416M
– –
-50
Closed -$6K
YALL icon
10091
Truth Social God Bless America ETF
YALL
$87.9M
– –
-100
Closed -$2K
YCBD icon
10092
cbdMD
YCBD
$6.05M
– –
-2
Closed –
YCBD icon
10093
PUT
cbdMD
YCBD
$6.05M
– –
-2
Closed -$1K
YEXT icon
10094
Yext
YEXT
$497M
– –
-13,801
Closed -$131K
YINN icon
10095
Direxion Daily FTSE China Bull 3X ETF
YINN
$653M
– –
-44,655
Closed -$2.12M
YMAB
10096
CALL
DELISTED
Y-mAbs Therapeutics
YMAB
– –
-700
Closed -$3K
YMAB
10097
DELISTED
Y-mAbs Therapeutics
YMAB
$0 ﹤0.01%
+48
New +$360
YQ
10098
17 Education & Technology Group
YQ
$21.6M
$0 ﹤0.01%
+121
New +$673
ZD icon
10099
PUT
Ziff Davis
ZD
$1.92B
– –
-1,900
Closed -$148K
ZEUS
10100
PUT
DELISTED
Olympic Steel
ZEUS
– –
-100
Closed -$5K
402 403
404
405 406

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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.