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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
OPY icon
9651
Oppenheimer Holdings
OPY
$1.18B
– –
-7,726
Closed -$302K
ORC
9652
Orchid Island Capital
ORC
$1.32B
– –
-130
Closed -$1.34K
ORGO icon
9653
Organogenesis Holdings
ORGO
$305M
– –
-7,328
Closed -$21.7K
ORN icon
9654
CALL
Orion Group Holdings
ORN
$519M
– –
-1,600
Closed -$4K
OSIS icon
9655
PUT
OSI Systems
OSIS
$3.44B
– –
-1,000
Closed -$102K
OSW icon
9656
PUT
OneSpaWorld
OSW
$2.6B
– –
-2,300
Closed -$27K
OTLY
9657
Oatly Group
OTLY
$373M
– –
-1,370
Closed -$56K
OUST icon
9658
Ouster
OUST
$2.52B
– –
-1,322
Closed -$6.91K
OVID icon
9659
Ovid Therapeutics
OVID
$439M
– –
-422
Closed -$1.43K
OWLT icon
9660
CALL
Owlet
OWLT
$150M
– –
-357
Closed -$1K
OXSQ icon
9661
CALL
Oxford Square Capital
OXSQ
$150M
– –
-1,400
Closed -$4K
PACK icon
9662
CALL
Ranpak Holdings
PACK
$561M
– –
-300
Closed -$1K
PAHC icon
9663
CALL
Phibro Animal Health
PAHC
$1.38B
– –
-800
Closed -$12K
PAM icon
9664
CALL
Pampa Energía
PAM
$4.77B
– –
-300
Closed -$9K
PASG icon
9665
Passage Bio
PASG
$15.8M
– –
-16
Closed –
PATH icon
9666
UiPath
PATH
$5.4B
– –
-94,311
Closed -$1.51M
PAX icon
9667
Patria Investments
PAX
$1.73B
– –
-1,747
Closed -$26K
PAYS icon
9668
Paysign
PAYS
$479M
– –
-18,341
Closed -$56.4K
PBPB
9669
CALL
DELISTED
Potbelly
PBPB
– –
-200
Closed -$1K
PBR icon
9670
Petrobras
PBR
$124B
– –
-1,676,726
Closed -$20.4M
PBR.A icon
9671
Petrobras Class A
PBR.A
$110B
– –
-48,270
Closed -$447K
PCB icon
9672
PCB Bancorp
PCB
$404M
– –
-84
Closed -$1.2K
PCOR icon
9673
Procore
PCOR
$6.22B
– –
-4,296
Closed -$253K
PCRX icon
9674
Pacira BioSciences
PCRX
$1.02B
– –
-561
Closed -$23.2K
PCRX icon
9675
PUT
Pacira BioSciences
PCRX
$1.02B
– –
-400
Closed -$16K
385 386
387
388 389

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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.