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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
ASTR
6601
DELISTED
Astra Space, Inc. Class A Common Stock
ASTR
$24K ﹤0.01%
4,456
+14
+0.3% +$80
ARAV
6602
CALL
DELISTED
Aravive, Inc. Common Stock
ARAV
$24K ﹤0.01%
19,500
-105,600
-84% -$171K
BRDS
6603
CALL
DELISTED
Bird Global, Inc.
BRDS
$24K ﹤0.01%
+11,900
New +$37.4K
CVM.WS
6604
CALL
DELISTED
Cel-Sci Corp Series S
CVM.WS
$24K ﹤0.01%
10,000
-17,800
-64% -$42.7K
ROI
6605
CALL
DELISTED
WISDOMTREE LARGECAP GROWTH FUND
ROI
$24K ﹤0.01%
300
– –
ADTN icon
6606
PUT
Adtran
ADTN
$675M
$23K ﹤0.01%
2,200
+1,700
+340% +$16.9K
ANIK icon
6607
PUT
Anika Therapeutics
ANIK
$215M
$23K ﹤0.01%
+900
New +$24.1K
BLDP
6608
Ballard Power Systems
BLDP
$754M
$23K ﹤0.01%
5,329
-14,280
-73% -$65.1K
BNL icon
6609
PUT
Broadstone Net Lease
BNL
$4.25B
$23K ﹤0.01%
1,500
-1,000
-40% -$16K
CDP icon
6610
PUT
COPT Defense Properties
CDP
$4.32B
$23K ﹤0.01%
1,000
+500
+100% +$11.7K
CNA icon
6611
CALL
CNA Financial
CNA
$14.9B
$23K ﹤0.01%
600
-2,300
-79% -$89.6K
CRD.A icon
6612
CALL
Crawford & Co Class A
CRD.A
$542M
$23K ﹤0.01%
+2,100
New +$20.2K
CRNT icon
6613
CALL
Ceragon Networks
CRNT
$188M
$23K ﹤0.01%
11,400
-1,000
-8% -$1.84K
DENN
6614
CALL
DELISTED
Denny's
DENN
$23K ﹤0.01%
1,900
-300
-14% -$3.41K
DGII icon
6615
Digi International
DGII
$2.47B
$23K ﹤0.01%
592
+206
+53% +$7.09K
EDC icon
6616
Direxion Daily MSCI Emerging Markets Bull 3X ETF
EDC
$131M
$23K ﹤0.01%
+759
New +$23.1K
FWRG icon
6617
First Watch Restaurant Group
FWRG
$814M
$23K ﹤0.01%
+1,393
New +$23.1K
GFS icon
6618
GlobalFoundries
GFS
$25.8B
$23K ﹤0.01%
+361
New +$21.8K
HRTG icon
6619
Heritage Insurance Holdings
HRTG
$903M
$23K ﹤0.01%
+6,062
New +$24.3K
JAKK icon
6620
Jakks Pacific
JAKK
$303M
$23K ﹤0.01%
1,200
+422
+54% +$9.14K
JAMF
6621
PUT
DELISTED
Jamf
JAMF
$23K ﹤0.01%
1,200
-1,900
-61% -$35.2K
KLXE icon
6622
CALL
KLX Energy Services
KLXE
$43.1M
$23K ﹤0.01%
2,400
-8,300
-78% -$81.7K
KNOP icon
6623
CALL
KNOT Offshore Partners
KNOP
$354M
$23K ﹤0.01%
4,800
+2,600
+118% +$12.9K
KZR
6624
CALL
DELISTED
Kezar Life Sciences
KZR
$23K ﹤0.01%
960
-60
-6% -$1.56K
LDI icon
6625
CALL
loanDepot
LDI
$548M
$23K ﹤0.01%
11,000
-39,900
-78% -$73.3K
263 264
265
266 267

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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.