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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
RSKD icon
10151
Riskified
RSKD
$860M
– –
-800
Closed -$3.73K
RSKD icon
10152
PUT
Riskified
RSKD
$860M
– –
-4,500
Closed -$17.6K
RSPT icon
10153
Invesco S&P 500 Equal Weight Technology ETF
RSPT
$5.85B
– –
-113
Closed -$5.11K
RTX icon
10154
RTX Corp
RTX
$271B
– –
-17,827
Closed -$3.27M
RVLV icon
10155
Revolve Group
RVLV
$1.52B
– –
-10,055
Closed -$222K
RVP icon
10156
CALL
Retractable Technologies
RVP
$21.3M
– –
-600
Closed -$396
RXL icon
10157
ProShares Ultra Health Care
RXL
$92.8M
– –
-150
Closed -$6.88K
RXO icon
10158
RXO
RXO
$3.41B
– –
-1,372
Closed -$30.3K
RXST icon
10159
RxSight
RXST
$265M
– –
-7,673
Closed -$46.3K
RY icon
10160
Royal Bank of Canada
RY
$292B
– –
-12,369
Closed -$2.29M
RYAAY icon
10161
Ryanair
RYAAY
$28.7B
– –
-9,942
Closed -$586K
RYLD icon
10162
Global X Russell 2000 Covered Call ETF
RYLD
$1.4B
– –
-3,019
Closed -$45.1K
SABR icon
10163
Sabre
SABR
$860M
– –
-18,138
Closed -$31.8K
SABS icon
10164
SAB Biotherapeutics
SABS
$338M
– –
-4,713
Closed -$17.5K
SAH icon
10165
Sonic Automotive
SAH
$2.56B
– –
-1,851
Closed -$142K
SAIC icon
10166
Saic
SAIC
$5.31B
– –
-778
Closed -$78.7K
SAN icon
10167
Banco Santander
SAN
$217B
– –
-14,008
Closed -$174K
SAR icon
10168
PUT
Saratoga Investment
SAR
$284M
– –
-500
Closed -$10.9K
SBGI icon
10169
Sinclair Inc
SBGI
$999M
– –
-3,818
Closed -$54.9K
SBS icon
10170
PUT
Sabesp
SBS
$18.1B
– –
-40,000
Closed -$244K
SCHF icon
10171
Schwab International Equity ETF
SCHF
$70.1B
– –
-984
Closed -$24.4K
SCHG icon
10172
Schwab US Large-Cap Growth ETF
SCHG
$62.8B
– –
-1,701
Closed -$49.5K
SCHL icon
10173
PUT
Scholastic
SCHL
$673M
– –
-10,300
Closed -$402K
SCL icon
10174
Stepan Co
SCL
$1.44B
– –
-564
Closed -$29.3K
SCM icon
10175
CALL
Stellus Capital Investment Corp
SCM
$250M
– –
-900
Closed -$8.29K
405 406
407
408 409

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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.