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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
CHH icon
9376
PUT
Choice Hotels
CHH
$4.53B
– –
-100
Closed -$10.3K
CHKP icon
9377
Check Point Software Technologies
CHKP
$14B
– –
-3,991
Closed -$519K
CIG icon
9378
CEMIG Preferred Shares
CIG
$6.12B
– –
-22,570
Closed -$52.5K
CLAR icon
9379
CALL
Clarus
CLAR
$144M
– –
-1,300
Closed -$3.54K
CLAR icon
9380
PUT
Clarus
CLAR
$144M
– –
-2,500
Closed -$6.8K
CLB icon
9381
PUT
Core Laboratories
CLB
$575M
– –
-100
Closed -$1.68K
CLF icon
9382
Cleveland-Cliffs
CLF
$7.13B
– –
-2,151
Closed -$23.7K
CLFD icon
9383
Clearfield
CLFD
$389M
– –
-350
Closed -$12.8K
CLGN icon
9384
CollPlant Biotechnologies
CLGN
$6.71M
– –
-12
Closed -$63
CLMT icon
9385
Calumet Specialty Products
CLMT
$4.67B
– –
-15,061
Closed -$506K
CLOV icon
9386
Clover Health Investments
CLOV
$2.26B
– –
-93,109
Closed -$316K
CLW icon
9387
CALL
Clearwater Paper
CLW
$337M
– –
-9,700
Closed -$139K
CMBM
9388
CALL
DELISTED
Cambium Networks
CMBM
– –
-42,900
Closed -$6.43K
CMBM
9389
PUT
DELISTED
Cambium Networks
CMBM
– –
-900
Closed -$135
CMCL icon
9390
CALL
Caledonia Mining Corp
CMCL
$509M
– –
-1,400
Closed -$31.6K
CMCL icon
9391
Caledonia Mining Corp
CMCL
$509M
– –
-1,801
Closed -$40.7K
CME icon
9392
CME Group
CME
$101B
– –
-3,061
Closed -$847K
CMPS
9393
Compass Pathways
CMPS
$1.84B
– –
-267,465
Closed -$2.71M
CMTL icon
9394
CALL
Comtech Telecommunications
CMTL
$46.7M
– –
-1,300
Closed -$4.32K
CNBS icon
9395
Amplify Seymour Cannabis ETF
CNBS
$81.2M
– –
-193
Closed -$4.25K
CNMD icon
9396
CONMED
CNMD
$1.48B
– –
-723
Closed -$26K
CNMD icon
9397
PUT
CONMED
CNMD
$1.48B
– –
-1,300
Closed -$46K
CNOB icon
9398
CALL
Center Bancorp
CNOB
$1.63B
– –
-100
Closed -$2.68K
CNTA
9399
CALL
DELISTED
Centessa Pharmaceuticals
CNTA
– –
-38,700
Closed -$1.54M
COLD icon
9400
Americold
COLD
$4.06B
– –
-10,571
Closed -$145K
374 375
376
377 378

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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.