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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
TTT icon
9851
ProShares UltraPro Short 20+ Year Treasury
TTT
$18.6M
– –
-3,238
Closed -$212K
TU icon
9852
Telus
TU
$15.9B
– –
-9,224
Closed -$163K
TURN
9853
DELISTED
180 Degree Capital
TURN
$0 ﹤0.01%
+31
New +$136
TUSK icon
9854
PUT
Mammoth Energy Services
TUSK
$137M
– –
-400
Closed -$1K
TUYA
9855
Tuya Inc
TUYA
$1.07B
$0 ﹤0.01%
388
+304
+362% +$486
TV icon
9856
CALL
Televisa
TV
$1.49B
– –
-1,700
Closed -$8K
TV icon
9857
Televisa
TV
$1.49B
– –
-31,421
Closed -$138K
TV icon
9858
PUT
Televisa
TV
$1.49B
– –
-8,700
Closed -$44K
TYO icon
9859
Direxion Daily 7-10 Year Treasury Bear 3X ETF
TYO
$12.4M
– –
-1,716
Closed -$22K
TZA icon
9860
Direxion Daily Small Cap Bear 3x ETF
TZA
$207M
– –
-514
Closed -$135K
U icon
9861
Unity
U
$12.8B
– –
-1,494
Closed -$57.5K
UBSI icon
9862
United Bankshares
UBSI
$6.46B
– –
-1,359
Closed -$40.9K
UCAR
9863
CALL
U Power Ltd
UCAR
$27M
– –
-13
Closed -$95K
UCAR
9864
U Power Ltd
UCAR
$27M
– –
-20
Closed -$105K
UCC icon
9865
ProShares Ultra Consumer Discretionary
UCC
$10.2M
– –
-141
Closed -$4K
UDMY
9866
DELISTED
Udemy
UDMY
– –
-5,709
Closed -$59.7K
UDR icon
9867
UDR
UDR
$12.8B
– –
-4,685
Closed -$187K
UEC icon
9868
Uranium Energy
UEC
$4.82B
– –
-17,604
Closed -$71.7K
UFI icon
9869
CALL
UNIFI
UFI
$119M
– –
-3,500
Closed -$28K
UFPI icon
9870
PUT
UFP Industries
UFPI
$4.9B
– –
-400
Closed -$38K
UFPT icon
9871
CALL
UFP Technologies
UFPT
$1.84B
– –
-400
Closed -$77K
UGP icon
9872
CALL
Ultrapar
UGP
$6.95B
– –
-20,000
Closed -$78K
UHT
9873
CALL
Universal Health Realty Income Trust
UHT
$601M
– –
-100
Closed -$4K
UHT
9874
PUT
Universal Health Realty Income Trust
UHT
$601M
– –
-100
Closed -$4K
UITB icon
9875
CALL
Victory Portfolios II VictoryShares Core Intermediate Bond ETF
UITB
$2.65B
– –
-100
Closed -$5K
393 394
395
396 397

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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.