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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
CLB icon
5951
CALL
Core Laboratories
CLB
$487M
$44K ﹤0.01%
1,900
-2,300
-55% -$52K
CUE icon
5952
PUT
Cue Biopharma
CUE
$111M
$44K ﹤0.01%
403
-84
-17% -$9.87K
CVI icon
5953
PUT
CVR Energy
CVI
$3.63B
$44K ﹤0.01%
1,500
-4,600
-75% -$124K
EDZ icon
5954
Direxion Daily MSCI Emerging Markets Bear 3X ETF
EDZ
$18.6M
$44K ﹤0.01%
368
+176
+92% +$22.1K
ELVN icon
5955
CALL
Enliven Therapeutics
ELVN
$3.83B
$44K ﹤0.01%
+2,200
New +$44.5K
FATE icon
5956
Fate Therapeutics
FATE
$282M
$44K ﹤0.01%
9,441
-895
-9% -$4.94K
KLXE icon
5957
KLX Energy Services
KLXE
$43.3M
$44K ﹤0.01%
4,581
-9,730
-68% -$95.8K
MEC icon
5958
PUT
Mayville Engineering Co
MEC
$650M
$44K ﹤0.01%
+3,600
New +$45.5K
METV icon
5959
CALL
Roundhill Ball Metaverse ETF
METV
$207M
$44K ﹤0.01%
4,400
-71,800
-94% -$684K
NINE
5960
CALL
DELISTED
Nine Energy Service
NINE
$44K ﹤0.01%
11,600
-33,000
-74% -$127K
RGTI icon
5961
CALL
Rigetti Computing
RGTI
$4.96B
$44K ﹤0.01%
37,500
-15,100
-29% -$11.3K
RYAM icon
5962
CALL
Rayonier Advanced Materials
RYAM
$593M
$44K ﹤0.01%
10,500
-16,200
-61% -$76.6K
RYTM icon
5963
PUT
Rhythm Pharmaceuticals
RYTM
$6.85B
$44K ﹤0.01%
2,700
-5,100
-65% -$92.1K
SD icon
5964
SandRidge Energy
SD
$505M
$44K ﹤0.01%
2,915
+972
+50% +$14.3K
ST icon
5965
PUT
Sensata Technologies
ST
$6.78B
$44K ﹤0.01%
+1,000
New +$43.9K
STE icon
5966
PUT
Steris
STE
$22.3B
$44K ﹤0.01%
+200
New +$40K
STRL icon
5967
CALL
Sterling Infrastructure
STRL
$18.5B
$44K ﹤0.01%
800
-500
-38% -$22.2K
TIGO icon
5968
CALL
Millicom
TIGO
$15.9B
$44K ﹤0.01%
2,900
+2,700
+1,350% +$48K
TV icon
5969
PUT
Televisa
TV
$1.51B
$44K ﹤0.01%
8,700
+4,100
+89% +$20.6K
UGI icon
5970
UGI
UGI
$7.72B
$44K ﹤0.01%
+1,663
New +$50.5K
UHAL icon
5971
U-Haul Holding Co
UHAL
$13.7B
$44K ﹤0.01%
798
-882
-53% -$51.7K
PGRU
5972
PUT
DELISTED
PropertyGuru Group Limited
PGRU
$44K ﹤0.01%
10,100
+9,600
+1,920% +$43.7K
CHS
5973
PUT
DELISTED
Chicos FAS, Inc.
CHS
$44K ﹤0.01%
8,400
+3,700
+79% +$19.3K
SPPI
5974
PUT
DELISTED
Spectrum Pharmaceuticals Inc
SPPI
$44K ﹤0.01%
46,700
– –
IBTX
5975
DELISTED
Independent Bank Group, Inc.
IBTX
$44K ﹤0.01%
+1,301
New +$48.3K
237 238
239
240 241

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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.