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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
NNN icon
5276
PUT
NNN REIT
NNN
$9.16B
$85K ﹤0.01%
2,000
-15,100
-88% -$650K
PFF icon
5277
iShares Preferred and Income Securities ETF
PFF
$13.3B
$85K ﹤0.01%
+2,777
New +$85K
PLBY icon
5278
CALL
Playboy Inc
PLBY
$133M
$85K ﹤0.01%
51,100
-47,100
-48% -$79.6K
CCEC
5279
Capital Clean Energy Carriers
CCEC
$1.35B
$85K ﹤0.01%
6,165
-15,123
-71% -$200K
GPP
5280
DELISTED
Green Plains Partners LP
GPP
$85K ﹤0.01%
6,641
-17,469
-72% -$223K
ATEN icon
5281
CALL
A10 Networks
ATEN
$2.16B
$84K ﹤0.01%
5,800
+3,100
+115% +$44.9K
BLDP
5282
PUT
Ballard Power Systems
BLDP
$841M
$84K ﹤0.01%
19,400
-32,100
-62% -$146K
BRBR icon
5283
PUT
BellRing Brands
BRBR
$1.53B
$84K ﹤0.01%
2,300
-8,400
-79% -$301K
CALX icon
5284
PUT
Calix
CALX
$2.22B
$84K ﹤0.01%
1,700
-700
-29% -$33.7K
CUBI icon
5285
CALL
Customers Bancorp
CUBI
$2.65B
$84K ﹤0.01%
2,800
+2,700
+2,700% +$60.5K
CXM icon
5286
PUT
Sprinklr
CXM
$1.45B
$84K ﹤0.01%
6,100
-4,500
-42% -$58.2K
FRGE
5287
CALL
DELISTED
Forge Global Holdings
FRGE
$84K ﹤0.01%
2,320
-313
-12% -$7.67K
INSW icon
5288
CALL
International Seaways
INSW
$4.71B
$84K ﹤0.01%
2,200
-24,700
-92% -$946K
IRWD icon
5289
Ironwood Pharmaceuticals
IRWD
$614M
$84K ﹤0.01%
+7,946
New +$85.4K
NGL icon
5290
NGL Energy Partners
NGL
$2.01B
$84K ﹤0.01%
21,680
+665
+3% +$2.15K
RMTI icon
5291
CALL
Rockwell Medical
RMTI
$28M
$84K ﹤0.01%
1,540
+1,310
+570% +$40.3K
ULCC icon
5292
CALL
Frontier Group Holdings
ULCC
$1.61B
$84K ﹤0.01%
8,700
+8,300
+2,075% +$74.5K
WFG icon
5293
West Fraser Timber
WFG
$4.99B
$84K ﹤0.01%
977
+151
+18% +$11.4K
XAIR icon
5294
PUT
Beyond Air
XAIR
$3.91M
$84K ﹤0.01%
50
-23
-32% -$52.6K
LSXMK
5295
DELISTED
Liberty Media Corporation Series C Liberty SiriusXM Common Stock
LSXMK
$84K ﹤0.01%
3,318
-42,635
-93% -$954K
TCN
5296
PUT
DELISTED
Tricon Residential Inc.
TCN
$84K ﹤0.01%
9,600
+5,900
+159% +$48.2K
CEQP
5297
PUT
DELISTED
Crestwood Equity Partners LP
CEQP
$84K ﹤0.01%
3,200
-1,100
-26% -$27.9K
AGRO icon
5298
CALL
Adecoagro
AGRO
$1.47B
$83K ﹤0.01%
8,900
-9,700
-52% -$85.8K
AMCX icon
5299
PUT
AMC Global Media
AMCX
$427M
$83K ﹤0.01%
7,000
-200
-3% -$2.88K
ANDE icon
5300
CALL
Andersons Inc
ANDE
$2.44B
$83K ﹤0.01%
1,800
-5,500
-75% -$230K
210 211
212
213 214

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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.