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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
BWAY
9326
Brainsway
BWAY
$569M
– –
-529
Closed -$8.01K
BWB icon
9327
Bridgewater Bancshares
BWB
$609M
– –
-427
Closed -$7.56K
BWB icon
9328
PUT
Bridgewater Bancshares
BWB
$609M
– –
-3,900
Closed -$69K
BWEN icon
9329
CALL
Broadwind
BWEN
$98.2M
– –
-6,800
Closed -$14.1K
BWX icon
9330
State Street SPDR Bloomberg International Treasury Bond ETF
BWX
$1.32B
– –
-51
Closed -$1.12K
BXC icon
9331
BlueLinx
BXC
$643M
– –
-3,069
Closed -$166K
BZFD icon
9332
BuzzFeed
BZFD
$90.8M
– –
-11,958
Closed -$13.7K
CACI icon
9333
CALL
CACI
CACI
$13.8B
– –
-100
Closed -$54.4K
CAE icon
9334
PUT
CAE Inc
CAE
$7.86B
– –
-300
Closed -$7.82K
CAL icon
9335
Caleres
CAL
$418M
– –
-4,248
Closed -$55.1K
CALF icon
9336
Pacer US Small Cap Cash Cows 100 ETF
CALF
$3.93B
– –
-1,480
Closed -$66.4K
CAPT
9337
DELISTED
Captivision
CAPT
– –
-21,164
Closed -$8.33K
CARG icon
9338
CarGurus
CARG
$3.01B
– –
-1,910
Closed -$61.9K
CARG icon
9339
PUT
CarGurus
CARG
$3.01B
– –
-1,000
Closed -$34K
CART icon
9340
Maplebear
CART
$11.8B
– –
-21,303
Closed -$891K
CASI
9341
DELISTED
CASI Pharmaceuticals
CASI
– –
-228
Closed -$25
CAT icon
9342
Caterpillar
CAT
$374B
– –
-75
Closed -$65.9K
CATX icon
9343
PUT
Perspective Therapeutics
CATX
$357M
– –
-27,700
Closed -$116K
CATY icon
9344
Cathay General Bancorp
CATY
$4.18B
– –
-54
Closed -$3.06K
CAVA icon
9345
CAVA Group
CAVA
$7.1B
– –
-7,488
Closed -$628K
CBAN icon
9346
CALL
Colony Bankcorp
CBAN
$462M
– –
-100
Closed -$2K
CBAT icon
9347
CALL
CBAK Energy Technology Ltd
CBAT
$87.2M
– –
-800
Closed -$661
CBAT icon
9348
CBAK Energy Technology Ltd
CBAT
$87.2M
– –
-704
Closed -$582
CBAT icon
9349
PUT
CBAK Energy Technology Ltd
CBAT
$87.2M
– –
-1,000
Closed -$827
CBSH icon
9350
CALL
Commerce Bancshares
CBSH
$8.37B
– –
-525
Closed -$25.8K
372 373
374
375 376

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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.