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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
CNTA
8776
DELISTED
Centessa Pharmaceuticals
CNTA
– –
-38
Closed -$260
CNXN icon
8777
PC Connection
CNXN
$2.05B
– –
-62
Closed -$2K
CNXN icon
8778
PUT
PC Connection
CNXN
$2.05B
– –
-200
Closed -$9K
CNYA icon
8779
iShares MSCI China A ETF
CNYA
$221M
$0 ﹤0.01%
+9
New +$263
COCO icon
8780
Vita Coco
COCO
$3.77B
– –
-853
Closed -$22.8K
COHU icon
8781
Cohu
COHU
$2.39B
– –
-3,237
Closed -$122K
COLB icon
8782
CALL
Columbia Banking Systems
COLB
$8.81B
– –
-1,800
Closed -$36K
COLD icon
8783
PUT
Americold
COLD
$4.09B
– –
-3,200
Closed -$103K
COMB icon
8784
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$135M
– –
-161
Closed -$3.48K
COR icon
8785
Cencora
COR
$60.3B
– –
-9,685
Closed -$1.79M
COST icon
8786
Costco
COST
$415B
– –
-163
Closed -$90K
CPIX icon
8787
CALL
Cumberland Pharmaceuticals
CPIX
$99M
– –
-3,600
Closed -$5K
CPRT icon
8788
Copart
CPRT
$25.9B
– –
-19,402
Closed -$863K
CPSS icon
8789
CALL
Consumer Portfolio Services
CPSS
$205M
– –
-1,900
Closed -$22K
CPSS icon
8790
PUT
Consumer Portfolio Services
CPSS
$205M
– –
-1,000
Closed -$11K
CQP icon
8791
Cheniere Energy
CQP
$31.8B
– –
-727
Closed -$37.4K
CRBU icon
8792
PUT
Caribou Biosciences
CRBU
$156M
– –
-3,700
Closed -$15K
CRDL
8793
Cardiol Therapeutics
CRDL
$136M
$0 ﹤0.01%
1,054
+215
+26% +$205
CRESY
8794
Cresud
CRESY
$794M
– –
-1,552
Closed -$11.6K
CRL icon
8795
Charles River Laboratories
CRL
$10.9B
– –
-2,487
Closed -$511K
CRWD icon
8796
CrowdStrike
CRWD
$187B
– –
-246,692
Closed -$9.59M
CSBR icon
8797
CALL
Champions Oncology
CSBR
$85.1M
– –
-2,800
Closed -$17K
CSBR icon
8798
PUT
Champions Oncology
CSBR
$85.1M
– –
-12,800
Closed -$81K
CSR
8799
Centerspace
CSR
$936M
– –
-94
Closed -$5.88K
CSTE icon
8800
Caesarstone
CSTE
$72.3M
$0 ﹤0.01%
+44
New +$212
350 351
352
353 354

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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.