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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
EFO icon
9526
ProShares Ultra MSCI EAFE
EFO
$29.4M
– –
-21
Closed -$1.33K
EFV icon
9527
iShares MSCI EAFE Value ETF
EFV
$32.2B
– –
-100
Closed -$7.43K
EFXT
9528
Enerflex
EFXT
$2.72B
– –
-95
Closed -$2.37K
EGAN icon
9529
CALL
eGain
EGAN
$153M
– –
-100
Closed -$789
EHAB
9530
CALL
DELISTED
Enhabit
EHAB
– –
-800
Closed -$11.3K
EHAB
9531
DELISTED
Enhabit
EHAB
– –
-1,281
Closed -$18K
ELVA
9532
Electrovaya
ELVA
$342M
– –
-1,207
Closed -$12K
EMLP icon
9533
CALL
First Trust North American Energy Infrastructure Fund
EMLP
$4.18B
– –
-10,100
Closed -$260K
ENTA icon
9534
Enanta Pharmaceuticals
ENTA
$410M
– –
-455
Closed -$6.12K
ENSG icon
9535
CALL
The Ensign Group
ENSG
$9.95B
– –
-200
Closed -$40.3K
EOLS icon
9536
Evolus
EOLS
$614M
– –
-7,557
Closed -$44.6K
EPD icon
9537
Enterprise Products Partners
EPD
$84.1B
– –
-4,532
Closed -$171K
EPRT icon
9538
Essential Properties Realty Trust
EPRT
$6.41B
– –
-101
Closed -$3.14K
EPSN icon
9539
Epsilon Energy
EPSN
$187M
– –
-526
Closed -$3.24K
EPV icon
9540
ProShares UltraShort FTSE Europe
EPV
$9.56M
– –
-99
Closed -$2.18K
VMRK
9541
CALL
Vivmark Residential
VMRK
$50.6B
– –
-300
Closed -$17.7K
EQWL icon
9542
Invesco S&P 100 Equal Weight ETF
EQWL
$2.88B
– –
-118
Closed -$13.6K
ERIE icon
9543
Erie Indemnity
ERIE
$13.2B
– –
-293
Closed -$67.2K
ERIE icon
9544
PUT
Erie Indemnity
ERIE
$13.2B
– –
-200
Closed -$50.3K
ERO icon
9545
Ero Copper
ERO
$3.64B
– –
-24,531
Closed -$695K
ESNT icon
9546
Essent Group
ESNT
$6.22B
– –
-21
Closed -$1.27K
ESPR
9547
DELISTED
Esperion Therapeutics
ESPR
– –
-36,467
Closed -$102K
EVCM icon
9548
CALL
EverCommerce
EVCM
$1.4B
– –
-100
Closed -$1.14K
EVCM icon
9549
EverCommerce
EVCM
$1.4B
– –
-5
Closed -$57
EVER icon
9550
EverQuote
EVER
$878M
– –
-2,428
Closed -$44.5K
380 381
382
383 384

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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.