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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
+6.46%
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
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
INDL icon
9401
Direxion Daily MSCI India Bull 2X ETF
INDL
$54.3M
$0 ﹤0.01%
16
-2,661
-99% -$116K
INFA
9402
PUT
DELISTED
Informatica
INFA
– –
-2,000
Closed -$32K
INFL icon
9403
Horizon Kinetics Inflation Beneficiaries ETF
INFL
$1.5B
– –
-32
Closed –
INFU icon
9404
InfuSystem Holdings
INFU
$179M
– –
-2
Closed -$18
INFU icon
9405
PUT
InfuSystem Holdings
INFU
$179M
– –
-2,400
Closed -$18K
INFY icon
9406
Infosys
INFY
$43.2B
– –
-10,979
Closed -$172K
INGN icon
9407
Inogen
INGN
$171M
– –
-1,341
Closed -$16K
INN
9408
Summit Hotel Properties
INN
$749M
– –
-2,199
Closed -$14.5K
INO icon
9409
Inovio Pharmaceuticals
INO
$83.9M
– –
-3,189
Closed -$25.7K
INO icon
9410
PUT
Inovio Pharmaceuticals
INO
$83.9M
– –
-442
Closed -$4K
INSG icon
9411
CALL
Inseego
INSG
$115M
– –
-250
Closed -$1K
INSP icon
9412
Inspire Medical Systems
INSP
$1.46B
– –
-183
Closed -$52.3K
INZY
9413
DELISTED
Inozyme Pharma
INZY
$0 ﹤0.01%
72
-4,109
-98% -$24.3K
INZY
9414
PUT
DELISTED
Inozyme Pharma
INZY
– –
-3,600
Closed -$20K
IONS icon
9415
Ionis Pharmaceuticals
IONS
$9.23B
– –
-1,019
Closed -$39.2K
IPSC icon
9416
CALL
Century Therapeutics
IPSC
$391M
– –
-1,500
Closed -$5K
IPSC icon
9417
Century Therapeutics
IPSC
$391M
$0 ﹤0.01%
+116
New +$374
IQV icon
9418
IQVIA
IQV
$34.6B
– –
-1,937
Closed -$389K
IREN icon
9419
Iris Energy
IREN
$14.5B
– –
-5,102
Closed -$19.5K
IRON icon
9420
Disc Medicine
IRON
$2.9B
$0 ﹤0.01%
+22
New +$781
IRT icon
9421
Independence Realty Trust
IRT
$3.87B
– –
-638
Closed -$10.9K
IRWD icon
9422
CALL
Ironwood Pharmaceuticals
IRWD
$624M
– –
-1,700
Closed -$17K
IRWD icon
9423
PUT
Ironwood Pharmaceuticals
IRWD
$624M
– –
-200
Closed -$2K
ITOT icon
9424
iShares Core S&P Total US Stock Market ETF
ITOT
$93.1B
– –
-173
Closed -$15K
ITRN icon
9425
Ituran Location and Control
ITRN
$1.09B
– –
-4,643
Closed -$101K
375 376
377
378 379

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.