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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$7.93B
Cap. Flow %
-5.08%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Consumer Discretionary 0.22%
3 Healthcare 0.17%
4 Communication Services 0.15%
5 Financials 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
EGAN icon
8751
eGain
EGAN
$176M
$0 ﹤0.01%
+13
New +$74
EGHT icon
8752
8x8 Inc
EGHT
$247M
$0 ﹤0.01%
238
-4,003
-94% -$10.3K
EHC icon
8753
Encompass Health
EHC
$11.2B
– –
-569
Closed -$55.6K
EHTH icon
8754
eHealth
EHTH
$42.5M
– –
-30,216
Closed -$275K
ELA icon
8755
Envela
ELA
$536M
– –
-306
Closed -$1.99K
ELA icon
8756
PUT
Envela
ELA
$536M
– –
-600
Closed -$4K
ELEV
8757
CALL
DELISTED
Elevation Oncology
ELEV
– –
-3,100
Closed -$1K
ELVN icon
8758
Enliven Therapeutics
ELVN
$3.78B
$0 ﹤0.01%
+50
New +$1.08K
EMLC icon
8759
VanEck JP Morgan EM Local Currency Bond ETF
EMLC
$4.74B
– –
-365
Closed -$8K
EMX
8760
DELISTED
EMX Royalty
EMX
– –
-999
Closed -$1.81K
ENIC icon
8761
Enel Chile
ENIC
$5.96B
$0 ﹤0.01%
223
-1,671
-88% -$5.35K
ENTA icon
8762
Enanta Pharmaceuticals
ENTA
$372M
– –
-56
Closed -$346
ENSG icon
8763
CALL
The Ensign Group
ENSG
$10.1B
– –
-3,500
Closed -$465K
ENSG icon
8764
PUT
The Ensign Group
ENSG
$10.1B
– –
-100
Closed -$13K
EPP icon
8765
iShares MSCI Pacific ex Japan ETF
EPP
$2.18B
$0 ﹤0.01%
1
– –
EPR icon
8766
EPR Properties
EPR
$4.86B
– –
-6,356
Closed -$312K
EQ icon
8767
Equillium
EQ
$157M
$0 ﹤0.01%
1,495
-595
-28% -$443
EQWL icon
8768
Invesco S&P 100 Equal Weight ETF
EQWL
$2.69B
$0 ﹤0.01%
1
-219
-100% -$23K
ERAS icon
8769
Erasca
ERAS
$6.63B
$0 ﹤0.01%
258
-4,197
-94% -$7.2K
ESI icon
8770
Element Solutions
ESI
$9.12B
– –
-9,794
Closed -$250K
ESRT icon
8771
PUT
Empire State Realty Trust
ESRT
$976M
– –
-1,400
Closed -$14K
ETN icon
8772
Eaton
ETN
$157B
– –
-20,153
Closed -$6.28M
ETSY icon
8773
Etsy
ETSY
$7.65B
– –
-68,994
Closed -$3.53M
ETWO
8774
PUT
DELISTED
E2open Parent Holdings
ETWO
– –
-4,200
Closed -$11K
EU
8775
PUT
enCore Energy
EU
$221M
– –
-5,700
Closed -$19K
349 350
351
352 353

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.