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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
SYRE icon
9776
PUT
Spyre Therapeutics
SYRE
$8.61B
– –
-144
Closed -$1K
TACT icon
9777
CALL
Transact Technologies
TACT
$52M
– –
-800
Closed -$7K
TAIL icon
9778
CALL
Cambria Tail Risk ETF
TAIL
$145M
– –
-400
Closed -$24K
TAL icon
9779
TAL Education Group
TAL
$5.73B
– –
-96,938
Closed -$680K
TAK icon
9780
PUT
Takeda Pharmaceutical
TAK
$53.9B
– –
-3,700
Closed -$58K
TARA icon
9781
Protara Therapeutics
TARA
$229M
– –
-195
Closed –
TARS icon
9782
Tarsus Pharmaceuticals
TARS
$2.51B
– –
-5,383
Closed -$95.3K
TASK icon
9783
TaskUs
TASK
$536M
– –
-7,302
Closed -$78.5K
TBF icon
9784
ProShares Short 20+ Year Treasury ETF
TBF
$84.8M
– –
-100
Closed -$2K
TBI
9785
CALL
Trueblue
TBI
$254M
– –
-3,300
Closed -$58K
TBPH icon
9786
PUT
Theravance Biopharma
TBPH
$871M
– –
-900
Closed -$9K
TCBI icon
9787
Texas Capital Bancshares
TCBI
$4.49B
– –
-166
Closed -$10K
TCMD icon
9788
Tactile Systems Technology
TCMD
$623M
– –
-1,001
Closed -$19.6K
TCMD icon
9789
PUT
Tactile Systems Technology
TCMD
$623M
– –
-300
Closed -$7K
TCPC icon
9790
CALL
BlackRock TCP Capital
TCPC
$268M
– –
-400
Closed -$4K
TCRT icon
9791
Alaunos Therapeutics
TCRT
$4.76M
– –
-94
Closed -$4.05K
TDC icon
9792
Teradata
TDC
$2.64B
– –
-13,041
Closed -$638K
TDUP icon
9793
ThredUp
TDUP
$779M
– –
-7,794
Closed -$26.4K
TDY icon
9794
Teledyne Technologies
TDY
$30.1B
– –
-149
Closed -$60.5K
TECK icon
9795
Teck Resources
TECK
$28B
– –
-34,038
Closed -$1.41M
TEF
9796
DELISTED
Telefonica
TEF
$0 ﹤0.01%
77
-488
-86% -$1.98K
TEF
9797
PUT
DELISTED
Telefonica
TEF
– –
-400
Closed -$1K
TELA icon
9798
CALL
TELA Bio
TELA
$32.8M
– –
-100
Closed -$1K
TENB icon
9799
Tenable Holdings
TENB
$3.62B
– –
-1,117
Closed -$50.2K
TERN
9800
DELISTED
Terns Pharmaceuticals
TERN
– –
-40,885
Closed -$259K
390 391
392
393 394

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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.