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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
IMCR icon
9001
PUT
Immunocore
IMCR
$1.81B
– –
-1,500
Closed -$44K
IMMP
9002
Immutep
IMMP
$57.8M
$0 ﹤0.01%
51
-10,251
-100% -$19.7K
IMMP
9003
PUT
Immutep
IMMP
$57.8M
– –
-6,700
Closed -$14K
IMMX icon
9004
Immix Biopharma
IMMX
$626M
– –
-22
Closed -$42
IMTX icon
9005
Immatics
IMTX
$1.27B
– –
-97,085
Closed -$507K
IMUX icon
9006
CALL
Immunic
IMUX
$195M
– –
-930
Closed -$9K
IMVT icon
9007
Immunovant
IMVT
$8.08B
– –
-86,847
Closed -$1.82M
INBK icon
9008
First Internet Bancorp
INBK
$227M
– –
-20
Closed –
INBX icon
9009
CALL
Inhibrx
INBX
$1.25B
– –
-3,300
Closed -$29K
INBX icon
9010
Inhibrx
INBX
$1.25B
– –
-1,147
Closed -$17K
INDL icon
9011
Direxion Daily MSCI India Bull 2X ETF
INDL
$54.3M
– –
-1,523
Closed -$90K
INDV icon
9012
Indivior Pharmaceuticals
INDV
$4.79B
– –
-4,703
Closed -$49.4K
INFA
9013
DELISTED
Informatica
INFA
– –
-4,977
Closed -$109K
INGN icon
9014
PUT
Inogen
INGN
$171M
– –
-900
Closed -$8K
INN
9015
Summit Hotel Properties
INN
$749M
– –
-22,015
Closed -$150K
INO icon
9016
PUT
Inovio Pharmaceuticals
INO
$83.9M
– –
-900
Closed -$1K
INQQ icon
9017
India Internet & Ecommerce ETF
INQQ
$42.6M
– –
-106
Closed -$1K
INSP icon
9018
Inspire Medical Systems
INSP
$1.46B
– –
-3,039
Closed -$550K
INVA icon
9019
CALL
Innoviva
INVA
$1.56B
– –
-300
Closed -$5K
INVA icon
9020
Innoviva
INVA
$1.56B
$0 ﹤0.01%
+30
New +$538
INVH icon
9021
Invitation Homes
INVH
$17.5B
– –
-94,410
Closed -$3.05M
INZY
9022
PUT
DELISTED
Inozyme Pharma
INZY
– –
-500
Closed -$1K
HYFT
9023
MindWalk Holdings
HYFT
$55.1M
$0 ﹤0.01%
755
+579
+329% +$261
IPG
9024
DELISTED
Interpublic Group of Companies
IPG
– –
-54,094
Closed -$1.48M
IPI icon
9025
Intrepid Potash
IPI
$463M
– –
-1,133
Closed -$29.9K
359 360
361
362 363

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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.