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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
TRNO icon
10326
Terreno Realty
TRNO
$7.15B
– –
-647
Closed -$39.7K
TRNO icon
10327
PUT
Terreno Realty
TRNO
$7.15B
– –
-100
Closed -$6.14K
TRU icon
10328
TransUnion
TRU
$15.3B
– –
-1,264
Closed -$88.6K
TRUP icon
10329
Trupanion
TRUP
$1.22B
– –
-2,532
Closed -$61.5K
TRX icon
10330
TRX Gold Corp
TRX
$377M
– –
-12,745
Closed -$14.8K
TSE
10331
CALL
DELISTED
Trinseo
TSE
– –
-5,800
Closed -$609
TSLQ icon
10332
Tradr TSLA Bear Daily ETF
TSLQ
$83.4M
– –
-6,052
Closed -$149K
TSLR icon
10333
GraniteShares 2x Long TSLA Daily ETF
TSLR
$73.2M
– –
-6
Closed -$124
TSLZ icon
10334
T-Rex 2X Inverse Tesla Daily Target ETF
TSLZ
$26.6M
– –
-694
Closed -$11K
TSN icon
10335
Tyson Foods
TSN
$18.1B
– –
-14,015
Closed -$877K
TTC icon
10336
CALL
Toro Company
TTC
$8.83B
– –
-4,500
Closed -$420K
TTEK icon
10337
Tetra Tech
TTEK
$9.19B
– –
-10,061
Closed -$295K
TTI icon
10338
PUT
TETRA Technologies
TTI
$1.02B
– –
-800
Closed -$6.82K
TUSK icon
10339
CALL
Mammoth Energy Services
TUSK
$150M
– –
-300
Closed -$735
TV icon
10340
CALL
Televisa
TV
$1.39B
– –
-7,500
Closed -$21.8K
TW icon
10341
PUT
Tradeweb Markets
TW
$22.4B
– –
-14,800
Closed -$1.74M
TXO icon
10342
TXO Partners LP
TXO
$835M
– –
-1,267
Closed -$15.9K
TXT icon
10343
PUT
Textron
TXT
$13.6B
– –
-1,600
Closed -$140K
TYO icon
10344
Direxion Daily 7-10 Year Treasury Bear 3X ETF
TYO
$11.2M
– –
-4,090
Closed -$55.8K
TYRA icon
10345
CALL
Tyra Biosciences
TYRA
$1.71B
– –
-600
Closed -$23K
TYRA icon
10346
PUT
Tyra Biosciences
TYRA
$1.71B
– –
-14,100
Closed -$540K
TZOO icon
10347
Travelzoo
TZOO
$63.8M
– –
-3,621
Closed -$33.3K
UA icon
10348
Under Armour Class C
UA
$2.2B
– –
-66,547
Closed -$383K
UAN icon
10349
CVR Partners
UAN
$1.38B
– –
-9,763
Closed -$1.2M
UDMY
10350
DELISTED
Udemy
UDMY
– –
-16,797
Closed -$77.6K
412 413
414
415 416

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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.