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Simplex Trading

Simplex Trading Portfolio holdings

AUM $171B
1-Year Est. Return 85%
 

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
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$156B
AUM Growth
-$22.4B
Cap. Flow
-$536M
Cap. Flow %
-0.34%
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 Miscellaneous 98.56%
2 Technology 0.41%
3 Consumer Discretionary 0.22%
4 Healthcare 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CPK icon
8651
PUT
Chesapeake Utilities
CPK
$3.2B
– –
-400
Closed -$48K
CPNG icon
8652
Coupang
CPNG
$27.5B
– –
-51,659
Closed -$1.2M
CPSS icon
8653
CALL
Consumer Portfolio Services
CPSS
$203M
– –
-300
Closed -$3K
CPT icon
8654
CALL
Camden Property Trust
CPT
$12.2B
– –
-300
Closed -$34K
CQP icon
8655
Cheniere Energy
CQP
$33.3B
– –
-310
Closed -$19.3K
CRAK icon
8656
VanEck Oil Refiners ETF
CRAK
$483M
– –
-371
Closed -$10K
CRC icon
8657
California Resources
CRC
$4.82B
– –
-8,365
Closed -$397K
CRI icon
8658
Carter's
CRI
$1.23B
– –
-427
Closed -$20.5K
CRON
8659
Cronos Group
CRON
$1.2B
– –
-44,126
Closed -$85.3K
CRSP icon
8660
CRISPR Therapeutics
CRSP
$5.39B
– –
-83,134
Closed -$3.52M
CRUS icon
8661
Cirrus Logic
CRUS
$5.67B
– –
-10,933
Closed -$1.13M
CRVL icon
8662
CorVel
CRVL
$3.45B
– –
-187
Closed -$20K
CSB icon
8663
VictoryShares US Small Cap High Div Volatility Wtd ETF
CSB
$260M
– –
-854
Closed -$50K
CSGS
8664
PUT
DELISTED
CSG Systems International
CSGS
– –
-5,500
Closed -$281K
CSL icon
8665
PUT
Carlisle Companies
CSL
$14B
– –
-100
Closed -$36K
CSTE icon
8666
PUT
Caesarstone
CSTE
$103M
– –
-500
Closed -$2K
CSV icon
8667
PUT
Carriage Services
CSV
$539M
– –
-1,000
Closed -$39K
CTKB icon
8668
CALL
Cytek Biosciences
CTKB
$611M
– –
-900
Closed -$5K
CTKB icon
8669
Cytek Biosciences
CTKB
$611M
$0 ﹤0.01%
+131
New +$679
CTOS icon
8670
CALL
Custom Truck One Source
CTOS
$2.09B
– –
-5,700
Closed -$27K
CTO
8671
CALL
CTO Realty Growth
CTO
$806M
– –
-700
Closed -$13K
CTRM icon
8672
CALL
Castor Maritime
CTRM
$22.9M
– –
-500
Closed -$1K
CTRN icon
8673
Citi Trends
CTRN
$593M
– –
-41
Closed -$1K
CTSO icon
8674
Cytosorbents Corp
CTSO
$22M
– –
-16
Closed –
CTVA icon
8675
Corteva
CTVA
$58.6B
– –
-7,953
Closed -$492K
345 346
347
348 349

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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's Q1 2025 filing shows 1,566 new, 3,139 increased, 3,654 reduced and 1,547 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M. The largest sale was Apple, an estimated $518M.

By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.

  • 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.