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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
-4.08%
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
$127B
AUM Growth
+$5.5B
Cap. Flow
+$11.9B
Cap. Flow %
9.37%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,399
Increased
3,690
Reduced
3,364
Closed
1,719

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$113M
2
GLD icon
SPDR Gold Trust
GLD
+$68.6M
3
NVDA icon
NVIDIA
NVDA
+$63.4M
4
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$55.2M
5
AAPL icon
Apple
AAPL
+$54.9M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$27.1M
2
QCOM icon
Qualcomm
QCOM
+$24.6M
3
DIS icon
Walt Disney
DIS
+$21.2M
4
AMD icon
Advanced Micro Devices
AMD
+$18.2M
5
SNOW icon
Snowflake
SNOW
+$16.1M

Sector Composition

Rank Sector Weight
1 Technology 0.44%
2 Consumer Discretionary 0.32%
3 Healthcare 0.22%
4 Financials 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WTS icon
9976
Watts Water Technologies
WTS
$11.4B
– –
-323
Closed -$59K
WTS icon
9977
PUT
Watts Water Technologies
WTS
$11.4B
– –
-6,700
Closed -$1.23M
WTTR icon
9978
CALL
Select Water Solutions
WTTR
$2.65B
– –
-27,500
Closed -$222K
WTW icon
9979
Willis Towers Watson
WTW
$27.1B
– –
-98
Closed -$20.9K
WWD icon
9980
Woodward
WWD
$24.1B
– –
-26
Closed -$3.25K
WWR icon
9981
PUT
Westwater Resources
WWR
$54.6M
– –
-1,300
Closed -$1K
WYNN icon
9982
Wynn Resorts
WYNN
$9.79B
– –
-6,117
Closed -$614K
X
9983
DELISTED
US Steel
X
– –
-47,077
Closed -$1.32M
XBI icon
9984
State Street SPDR S&P Biotech ETF
XBI
$10.2B
– –
-116,879
Closed -$9.72M
XBIT icon
9985
XBiotech
XBIT
$69.2M
$0 ﹤0.01%
164
-309
-65% -$1.55K
XES icon
9986
State Street SPDR S&P Oil & Gas Equipment & Services ETF
XES
$390M
– –
-948
Closed -$74K
XLE icon
9987
State Street Energy Select Sector SPDR ETF
XLE
$39.2B
– –
-273,848
Closed -$11.1M
XLV icon
9988
State Street Health Care Select Sector SPDR ETF
XLV
$41.3B
– –
-8,644
Closed -$1.15M
XME icon
9989
State Street SPDR S&P Metals & Mining ETF
XME
$4.12B
– –
-17,479
Closed -$888K
XMTR icon
9990
Xometry
XMTR
$5.44B
– –
-13,247
Closed -$251K
XNCR icon
9991
CALL
Xencor
XNCR
$1.45B
– –
-300
Closed -$7K
XOM icon
9992
ExxonMobil
XOM
$640B
– –
-59,295
Closed -$6.5M
XOS icon
9993
Xos
XOS
$29.4M
$0 ﹤0.01%
+3
New +$32
XPEV icon
9994
XPeng
XPEV
$12.3B
– –
-368,066
Closed -$6.24M
XXII
9995
22nd Century Group
XXII
$1.47M
– –
0
– –
XWEL icon
9996
XWELL
XWEL
$9.04M
$0 ﹤0.01%
66
-897
-93% -$3.91K
XYLD icon
9997
PUT
Global X S&P 500 Covered Call ETF
XYLD
$3.21B
– –
-100
Closed -$2K
YANG icon
9998
Direxion Daily FTSE China Bear 3X ETF
YANG
$87.6M
– –
-873
Closed -$191K
YELP icon
9999
Yelp
YELP
$1.36B
– –
-150,658
Closed -$6.34M
YOU icon
10000
Clear Secure
YOU
$5.27B
– –
-41,196
Closed -$913K
398 399
400
401 402

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Simplex Trading's Q3 2023 Portfolio in Review

As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.

By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.

  • Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
  • Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
  • Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
  • Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
  • Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
  • Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
  • Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.

Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.