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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
+39.06%
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
$171B
AUM Growth
+$21.5B
Cap. Flow
-$29.5M
Cap. Flow %
-0.02%
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$146M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$108M
3
AAPL icon
Apple
AAPL
+$62.9M
4
TSLA icon
Tesla
TSLA
+$51.9M
5
MU icon
Micron Technology
MU
+$39.5M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$108M
2
META icon
Meta Platforms (Facebook)
META
+$104M
3
AMD icon
Advanced Micro Devices
AMD
+$92.1M
4
AMZN icon
Amazon
AMZN
+$90.3M
5
TSM icon
TSMC
TSM
+$82.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.28%
2 Technology 0.76%
3 Consumer Discretionary 0.21%
4 Communication Services 0.19%
5 Healthcare 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CBT icon
9351
CALL
Cabot Corp
CBT
$4.21B
– –
-11,000
Closed -$828K
CBU icon
9352
Community Bank
CBU
$3.36B
– –
-787
Closed -$49.8K
CBUS icon
9353
CALL
Cibus
CBUS
$122M
– –
-500
Closed -$990
CCL icon
9354
Carnival Corporation Ltd
CCL
$32.2B
– –
-131,163
Closed -$3.58M
CCNE icon
9355
CNB Financial Corp
CCNE
$1.03B
– –
-51
Closed -$1.48K
CCNE icon
9356
PUT
CNB Financial Corp
CCNE
$1.03B
– –
-200
Closed -$5.79K
CCSI icon
9357
Consensus Cloud Solutions
CCSI
$648M
– –
-1,263
Closed -$37.8K
CCU icon
9358
Compañía de Cervecerías Unidas
CCU
$2.19B
– –
-2,540
Closed -$29.5K
CCU icon
9359
PUT
Compañía de Cervecerías Unidas
CCU
$2.19B
– –
-4,600
Closed -$52.2K
CDLX icon
9360
CALL
Cardlytics
CDLX
$21.3M
– –
-8,730
Closed -$91.7K
CDLX icon
9361
Cardlytics
CDLX
$21.3M
– –
-6,940
Closed -$72.9K
CDLX icon
9362
PUT
Cardlytics
CDLX
$21.3M
– –
-860
Closed -$9.03K
CDP icon
9363
COPT Defense Properties
CDP
$3.99B
– –
-240
Closed -$7.34K
CDP icon
9364
PUT
COPT Defense Properties
CDP
$3.99B
– –
-1,500
Closed -$45.9K
CDW icon
9365
CDW
CDW
$19.1B
– –
-308
Closed -$38.7K
CDZI icon
9366
Cadiz
CDZI
$353M
– –
-53,213
Closed -$237K
BNCWW
9367
CALL
CEA Industries Inc Warrant
BNCWW
– –
-10,700
Closed -$31.2K
CEG icon
9368
Constellation Energy
CEG
$106B
– –
-6,258
Closed -$1.76M
CENN icon
9369
CALL
Cenntro
CENN
$10.5M
– –
-248
Closed -$1.79K
CENN icon
9370
Cenntro
CENN
$10.5M
– –
-6
Closed -$39
CERS icon
9371
Cerus
CERS
$522M
– –
-791
Closed -$1.92K
CFFN icon
9372
CALL
Capitol Federal Financial
CFFN
$1.09B
– –
-200
Closed -$1.43K
CFFN icon
9373
PUT
Capitol Federal Financial
CFFN
$1.09B
– –
-300
Closed -$2.14K
CGBD icon
9374
CALL
Carlyle Secured Lending
CGBD
$804M
– –
-1,100
Closed -$12K
CHCO icon
9375
City Holding Co
CHCO
$2.04B
– –
-422
Closed -$53K
373 374
375
376 377

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Simplex Trading's Q2 2026 Portfolio in Review

As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.

Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.

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

  • Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
  • Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
  • Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
  • Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
  • Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
  • Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.

Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.