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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
LRGF icon
9876
iShares US Equity Factor ETF
LRGF
$3.73B
– –
-10
Closed -$660
LTRN icon
9877
CALL
Lantern Pharma
LTRN
$24.4M
– –
-600
Closed -$822
LULU icon
9878
lululemon athletica
LULU
$11.1B
– –
-31,540
Closed -$4.21M
LUNG icon
9879
Pulmonx
LUNG
$94.9M
– –
-4,064
Closed -$5.6K
LVWR icon
9880
PUT
LiveWire
LVWR
$263M
– –
-100
Closed -$166
LVS icon
9881
Las Vegas Sands
LVS
$28.7B
– –
-519
Closed -$26.9K
LXEO icon
9882
Lexeo Therapeutics
LXEO
$401M
– –
-1,240
Closed -$6.71K
LXFR icon
9883
CALL
Luxfer Holdings
LXFR
$460M
– –
-2,300
Closed -$28K
LXP icon
9884
LXP Industrial Trust
LXP
$3.58B
– –
-1,189
Closed -$61.2K
LXP icon
9885
PUT
LXP Industrial Trust
LXP
$3.58B
– –
-2,300
Closed -$106K
LYTS icon
9886
CALL
LSI Industries
LYTS
$754M
– –
-200
Closed -$3.72K
LYTS icon
9887
LSI Industries
LYTS
$754M
– –
-48
Closed -$892
LZB icon
9888
La-Z-Boy
LZB
$1.31B
– –
-88
Closed -$3.18K
LZB icon
9889
PUT
La-Z-Boy
LZB
$1.31B
– –
-300
Closed -$9.64K
MAIN icon
9890
Main Street Capital
MAIN
$5.39B
– –
-480
Closed -$25.3K
MAN icon
9891
ManpowerGroup
MAN
$2.88B
– –
-1,596
Closed -$48.9K
MAPS
9892
PUT
DELISTED
WM TECHNOLOGY INC A
MAPS
– –
-500
Closed -$329
MAS icon
9893
Masco
MAS
$14.3B
– –
-5,048
Closed -$352K
MASI
9894
CALL
DELISTED
Masimo
MASI
– –
-46,400
Closed -$8.25M
MASI
9895
PUT
DELISTED
Masimo
MASI
– –
-1,100
Closed -$196K
MAX icon
9896
MediaAlpha
MAX
$638M
– –
-6,846
Closed -$64.6K
MAX icon
9897
PUT
MediaAlpha
MAX
$638M
– –
-16,800
Closed -$156K
MAXI icon
9898
Simplify Bitcoin Strategy ETF
MAXI
$37.8M
– –
-15,728
Closed -$150K
MCD icon
9899
McDonald's
MCD
$181B
– –
-7,988
Closed -$2.29M
MCFT icon
9900
PUT
MasterCraft Boat Holdings
MCFT
$585M
– –
-100
Closed -$2.05K
394 395
396
397 398

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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.