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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
VEGI icon
9901
iShares MSCI Agriculture Producers ETF
VEGI
$167M
– –
-20
Closed –
VEON icon
9902
PUT
VEON
VEON
$4.42B
– –
-100
Closed -$2K
VERA icon
9903
Vera Therapeutics
VERA
$2.59B
– –
-70,522
Closed -$1.21M
VERA icon
9904
PUT
Vera Therapeutics
VERA
$2.59B
– –
-77,400
Closed -$1.24M
VERI icon
9905
Veritone
VERI
$91.1M
$0 ﹤0.01%
+178
New +$591
VERV
9906
DELISTED
Verve Therapeutics
VERV
– –
-324
Closed -$5.22K
VERU icon
9907
Veru
VERU
$45M
– –
-170
Closed -$1.85K
VERX icon
9908
Vertex
VERX
$2.23B
– –
-3,440
Closed -$70.8K
VET icon
9909
Vermilion Energy
VET
$1.96B
– –
-70,423
Closed -$991K
VGLT icon
9910
Vanguard Long-Term Treasury ETF
VGLT
$10.5B
– –
-4,667
Closed -$296K
VGZ icon
9911
CALL
Vista Gold
VGZ
$327M
– –
-7,700
Closed -$4K
VHC icon
9912
VirnetX Holding Corp
VHC
$49.1M
$0 ﹤0.01%
30
-680
-96% -$5.26K
VHC icon
9913
PUT
VirnetX Holding Corp
VHC
$49.1M
– –
-10,010
Closed -$93K
VHT icon
9914
Vanguard Health Care ETF
VHT
$19.4B
– –
-168
Closed -$41K
VIAV icon
9915
CALL
Viavi Solutions
VIAV
$8.6B
– –
-10,600
Closed -$120K
VIAV icon
9916
Viavi Solutions
VIAV
$8.6B
$0 ﹤0.01%
+46
New +$479
VIAV icon
9917
PUT
Viavi Solutions
VIAV
$8.6B
– –
-1,700
Closed -$19K
VINP icon
9918
Vinci Compass Investments Ltd
VINP
$624M
– –
-84
Closed –
VIOV icon
9919
Vanguard S&P Small-Cap 600 Value ETF
VIOV
$1.88B
– –
-260
Closed -$21K
VLN icon
9920
CALL
Valens Semiconductor
VLN
$185M
– –
-400
Closed -$1K
VLN icon
9921
PUT
Valens Semiconductor
VLN
$185M
– –
-400
Closed -$1K
VLRS
9922
CALL
Controladora Vuela Compania de Aviacion
VLRS
$787M
– –
-10,000
Closed -$139K
VMD icon
9923
CALL
Viemed Healthcare
VMD
$346M
– –
-1,500
Closed -$14K
VMD icon
9924
Viemed Healthcare
VMD
$346M
$0 ﹤0.01%
+37
New +$303
VNDA icon
9925
PUT
Vanda Pharmaceuticals
VNDA
$328M
– –
-200
Closed -$1K
395 396
397
398 399

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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.