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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
ECVT icon
9176
CALL
Ecovyst
ECVT
$1.37B
– –
-100
Closed -$1K
EEM icon
9177
iShares MSCI Emerging Markets ETF
EEM
$28B
– –
-566,385
Closed -$22.3M
EFX icon
9178
Equifax
EFX
$20.2B
– –
-2,734
Closed -$575K
EGBN icon
9179
Eagle Bancorp
EGBN
$869M
– –
-4,760
Closed -$112K
EGAN icon
9180
eGain
EGAN
$177M
– –
-138
Closed -$1K
EHC icon
9181
Encompass Health
EHC
$11.2B
– –
-24,328
Closed -$1.52M
CHRN
9182
ChronoScale Holdings
CHRN
$3.17B
– –
-15
Closed -$333
ELDN icon
9183
Eledon Pharmaceuticals
ELDN
$272M
$0 ﹤0.01%
220
+151
+219% +$315
ELF icon
9184
e.l.f. Beauty
ELF
$4.51B
– –
-46,998
Closed -$4.52M
EME icon
9185
Emcor
EME
$33.1B
– –
-5,558
Closed -$930K
EMQQ icon
9186
EMQQ The Emerging Markets Internet & Ecommerce ETF
EMQQ
$258M
$0 ﹤0.01%
+28
New +$835
EMX
9187
DELISTED
EMX Royalty
EMX
$0 ﹤0.01%
433
+296
+216% +$576
ENIC icon
9188
CALL
Enel Chile
ENIC
$5.98B
– –
-8,500
Closed -$22K
ENIC icon
9189
Enel Chile
ENIC
$5.98B
$0 ﹤0.01%
+141
New +$415
ENPH icon
9190
Enphase Energy
ENPH
$4.86B
– –
-129,302
Closed -$23.1M
ENTA icon
9191
CALL
Enanta Pharmaceuticals
ENTA
$368M
– –
-400
Closed -$16K
ENSG icon
9192
The Ensign Group
ENSG
$10.1B
– –
-200
Closed -$19K
ENTX icon
9193
Entera Bio
ENTX
$103M
$0 ﹤0.01%
+99
New +$85
EPAM icon
9194
EPAM Systems
EPAM
$4.75B
– –
-1,398
Closed -$352K
EPIX
9195
CALL
DELISTED
ESSA Pharma
EPIX
– –
-12,800
Closed -$38K
EQT icon
9196
EQT Corp
EQT
$33.1B
– –
-30,346
Closed -$1.07M
ERII icon
9197
CALL
Energy Recovery
ERII
$433M
– –
-200
Closed -$4K
ESCA icon
9198
Escalade
ESCA
$256M
$0 ﹤0.01%
+45
New +$612
ESTA icon
9199
Establishment Labs
ESTA
$2.73B
– –
-1,270
Closed -$87.7K
ESTC icon
9200
Elastic
ESTC
$6.08B
– –
-18,559
Closed -$1.16M
366 367
368
369 370

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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.