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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
ATAT icon
9251
CALL
Atour Lifestyle Holdings
ATAT
$4.67B
– –
-42,500
Closed -$1.56M
ATOM icon
9252
Atomera
ATOM
$158M
– –
-648
Closed -$5.08K
ATOS icon
9253
PUT
Atossa Therapeutics
ATOS
$25.1M
– –
-15,800
Closed -$83.1K
AUDC icon
9254
AudioCodes
AUDC
$245M
– –
-66
Closed -$602
AURA icon
9255
Aura Biosciences
AURA
$784M
– –
-8,430
Closed -$60.3K
AUTL
9256
Autolus Therapeutics
AUTL
$596M
– –
-23,641
Closed -$37.1K
AVA icon
9257
CALL
Avista
AVA
$3.14B
– –
-100
Closed -$4.01K
AVA icon
9258
PUT
Avista
AVA
$3.14B
– –
-11,600
Closed -$466K
AVNT icon
9259
Avient
AVNT
$3.98B
– –
-12
Closed -$435
JBIO
9260
Jade Biosciences
JBIO
$1.27B
– –
-83
Closed -$1.73K
AVTR icon
9261
Avantor
AVTR
$10.1B
– –
-14,727
Closed -$127K
AWAY icon
9262
Amplify Travel Tech ETF
AWAY
$36.1M
– –
-962
Closed -$15.5K
AWI icon
9263
CALL
Armstrong World Industries
AWI
$7.33B
– –
-100
Closed -$16.5K
AXP icon
9264
American Express
AXP
$220B
– –
-4,556
Closed -$1.46M
AXS icon
9265
AXIS Capital
AXS
$7.38B
– –
-6,862
Closed -$688K
AXS icon
9266
PUT
AXIS Capital
AXS
$7.38B
– –
-300
Closed -$30.4K
AYI icon
9267
Acuity Brands
AYI
$10B
– –
-149
Closed -$44.2K
AZZ icon
9268
PUT
AZZ Inc
AZZ
$4.21B
– –
-200
Closed -$25K
BABA icon
9269
Alibaba
BABA
$281B
– –
-66,720
Closed -$8.36M
BAH icon
9270
Booz Allen Hamilton
BAH
$8.76B
– –
-2,742
Closed -$209K
BAM icon
9271
Brookfield Asset Management
BAM
$80.8B
– –
-14,463
Closed -$683K
BANF icon
9272
BancFirst
BANF
$3.79B
– –
-23
Closed -$2.5K
BANX
9273
CALL
ArrowMark Financial
BANX
$201M
– –
-100
Closed -$1.91K
BANX
9274
PUT
ArrowMark Financial
BANX
$201M
– –
-100
Closed -$1.91K
BAP icon
9275
PUT
Credicorp
BAP
$30.4B
– –
-200
Closed -$67.8K
369 370
371
372 373

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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.