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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
KRBN icon
9826
KraneShares Global Carbon Strategy ETF
KRBN
$136M
– –
-208
Closed -$6.17K
KRC icon
9827
Kilroy Realty
KRC
$4.32B
– –
-177
Closed -$6.02K
KRG icon
9828
CALL
Kite Realty
KRG
$5.2B
– –
-1,400
Closed -$34.4K
KRG icon
9829
PUT
Kite Realty
KRG
$5.2B
– –
-200
Closed -$4.91K
KRNT icon
9830
Kornit Digital
KRNT
$711M
– –
-11,422
Closed -$167K
KRNT icon
9831
PUT
Kornit Digital
KRNT
$711M
– –
-63,600
Closed -$932K
KROS icon
9832
Keros Therapeutics
KROS
$224M
– –
-22,288
Closed -$248K
KROS icon
9833
PUT
Keros Therapeutics
KROS
$224M
– –
-58,700
Closed -$648K
KRYS icon
9834
Krystal Biotech
KRYS
$10.6B
– –
-50
Closed -$14.9K
KTEC icon
9835
KraneShares Hang Seng TECH Index ETF
KTEC
$55.5M
– –
-1,510
Closed -$20.7K
KURA icon
9836
Kura Oncology
KURA
$1.18B
– –
-6,905
Closed -$65.1K
KW
9837
CALL
DELISTED
Kennedy-Wilson Holdings
KW
– –
-100
Closed -$1.08K
KW
9838
DELISTED
Kennedy-Wilson Holdings
KW
– –
-300
Closed -$3.25K
KW
9839
PUT
DELISTED
Kennedy-Wilson Holdings
KW
– –
-8,200
Closed -$88.7K
KWR icon
9840
Quaker Houghton
KWR
$2.78B
– –
-184
Closed -$25.9K
KZR
9841
CALL
DELISTED
Kezar Life Sciences
KZR
– –
-19,900
Closed -$148K
L icon
9842
Loews
L
$22.3B
– –
-91
Closed -$9.86K
LAB icon
9843
Standard BioTools
LAB
$269M
– –
-2,915
Closed -$2.75K
LABD icon
9844
Direxion Daily S&P Biotech Bear 3X ETF
LABD
$83.6M
– –
-17,221
Closed -$281K
LAND
9845
Gladstone Land Corp
LAND
$424M
– –
-12,169
Closed -$116K
LASR icon
9846
nLIGHT
LASR
$2.31B
– –
-8,988
Closed -$627K
LAUR icon
9847
PUT
Laureate Education
LAUR
$5.06B
– –
-100
Closed -$3.48K
LAW icon
9848
CALL
CS Disco
LAW
$275M
– –
-2,100
Closed -$8.02K
LAW icon
9849
CS Disco
LAW
$275M
– –
-10,069
Closed -$39K
LAZ icon
9850
Lazard
LAZ
$4.39B
– –
-3,532
Closed -$162K
392 393
394
395 396

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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.