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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$127B
AUM Growth
+$5.5B
Cap. Flow
+$559M
Cap. Flow %
0.44%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,401
Increased
3,688
Reduced
3,363
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 Miscellaneous 98.25%
2 Technology 0.44%
3 Consumer Discretionary 0.32%
4 Healthcare 0.22%
5 Financials 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VVX icon
9951
CALL
V2X
VVX
$2.33B
– –
-100
Closed -$4K
VVX icon
9952
PUT
V2X
VVX
$2.33B
– –
-100
Closed -$4K
WASH icon
9953
PUT
Washington Trust Bancorp
WASH
$768M
– –
-100
Closed -$2K
WATT icon
9954
CALL
Energous
WATT
$59.3M
– –
-63
Closed -$9K
WATT icon
9955
PUT
Energous
WATT
$59.3M
– –
-13
Closed -$1K
WBX
9956
CALL
Wallbox
WBX
$80.5M
– –
-125
Closed -$8K
WBX
9957
Wallbox
WBX
$80.5M
– –
-95
Closed -$6.2K
WCC
9958
WESCO International
WCC
$17.1B
– –
-8,526
Closed -$1.38M
WEBL icon
9959
Direxion Daily Dow Jones Internet Bull 3X ETF
WEBL
$98.4M
– –
-2,132
Closed -$24K
WERN icon
9960
CALL
Werner Enterprises
WERN
$2.4B
– –
-4,200
Closed -$185K
WES icon
9961
Western Midstream Partners
WES
$20.5B
– –
-3,272
Closed -$88.8K
WH icon
9962
Wyndham Hotels & Resorts
WH
$5.33B
– –
-24,685
Closed -$1.83M
WHF icon
9963
CALL
WhiteHorse Finance
WHF
$152M
– –
-200
Closed -$2K
WK icon
9964
Workiva
WK
$4.17B
– –
-18,988
Closed -$1.97M
WKEY
9965
CALL
WISeKey
WKEY
$77.3M
– –
-1,880
Closed -$3K
WKEY
9966
WISeKey
WKEY
$77.3M
– –
-69
Closed –
WKC icon
9967
PUT
World Kinect Corp
WKC
$1.81B
– –
-100
Closed -$2K
WKHS icon
9968
Workhorse Group
WKHS
$33.8M
– –
-11
Closed -$28.3K
WLY icon
9969
CALL
John Wiley & Sons Class A
WLY
$2.44B
– –
-2,000
Closed -$68K
WNS
9970
DELISTED
WNS Holdings
WNS
– –
-414
Closed -$28K
WOLF icon
9971
Wolfspeed
WOLF
$1.47B
– –
-14,157
Closed -$741K
WOOD icon
9972
iShares Global Timber & Forestry ETF
WOOD
$271M
– –
-100
Closed -$7K
WPC icon
9973
W.P. Carey
WPC
$16B
– –
-48,716
Closed -$3.12M
WST icon
9974
West Pharmaceutical
WST
$23.9B
– –
-344
Closed -$133K
WTS icon
9975
CALL
Watts Water Technologies
WTS
$12.1B
– –
-100
Closed -$18K
397 398
399
400 401

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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's Q3 2023 filing shows 1,401 new, 3,688 increased, 3,363 reduced and 1,719 closed positions. Its largest new stake was Amazon: 841,102 shares worth $107M. The largest sale was Netflix, an estimated $27.1M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • 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 1,401 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.