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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
IVOL icon
9776
Quadratic Interest Rate Volatility and Inflation Hedge ETF
IVOL
$274M
– –
-26
Closed -$486
IVZ icon
9777
Invesco
IVZ
$14.6B
– –
-10,300
Closed -$273K
IWC icon
9778
iShares Micro-Cap ETF
IWC
$1.51B
– –
-1,625
Closed -$259K
IYH icon
9779
iShares US Healthcare ETF
IYH
$3.83B
– –
-991
Closed -$61.1K
IYK icon
9780
iShares US Consumer Staples ETF
IYK
$1.4B
– –
-115
Closed -$8.05K
JAKK icon
9781
CALL
Jakks Pacific
JAKK
$281M
– –
-200
Closed -$3.98K
JAKK icon
9782
Jakks Pacific
JAKK
$281M
– –
-930
Closed -$18.5K
JBGS
9783
JBG SMITH
JBGS
$685M
– –
-4,952
Closed -$72.3K
JBGS
9784
PUT
JBG SMITH
JBGS
$685M
– –
-10,000
Closed -$146K
JBI icon
9785
CALL
Janus International
JBI
$694M
– –
-1,900
Closed -$9.79K
JBLU icon
9786
JetBlue
JBLU
$1.75B
– –
-183,412
Closed -$934K
JBSS icon
9787
John B. Sanfilippo & Son
JBSS
$847M
– –
-574
Closed -$45.4K
JCPB icon
9788
JPMorgan Core Plus Bond ETF
JCPB
$14.5B
– –
-100
Closed -$4.71K
JEF icon
9789
Jefferies Financial Group
JEF
$12.7B
– –
-3,142
Closed -$162K
JELD icon
9790
JELD-WEN Holding
JELD
$200M
– –
-13,383
Closed -$20.6K
JETS icon
9791
US Global Jets ETF
JETS
$773M
– –
-16,799
Closed -$414K
JFIN
9792
PUT
Jiayin Group
JFIN
$89M
– –
-100
Closed -$419
JHG
9793
DELISTED
Janus Henderson
JHG
– –
-1,333
Closed -$68.9K
JHG
9794
PUT
DELISTED
Janus Henderson
JHG
– –
-13,700
Closed -$704K
JJSF icon
9795
J&J Snack Foods
JJSF
$1.57B
– –
-365
Closed -$28.9K
JJSF icon
9796
PUT
J&J Snack Foods
JJSF
$1.57B
– –
-3,300
Closed -$262K
JNK icon
9797
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$6.81B
– –
-644
Closed -$61.6K
JYNT icon
9798
PUT
The Joint Corp
JYNT
$118M
– –
-100
Closed -$885
KALU icon
9799
CALL
Kaiser Aluminum
KALU
$2.68B
– –
-100
Closed -$12.1K
KALU icon
9800
PUT
Kaiser Aluminum
KALU
$2.68B
– –
-100
Closed -$12.1K
390 391
392
393 394

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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.