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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
ABCB icon
9151
CALL
Ameris Bancorp
ABCB
$5.77B
– –
-1,500
Closed -$117K
ABEO icon
9152
Abeona Therapeutics
ABEO
$343M
– –
-31,096
Closed -$171K
ABM icon
9153
CALL
ABM Industries
ABM
$2.76B
– –
-1,000
Closed -$38.5K
ABOS icon
9154
Acumen Pharmaceuticals
ABOS
$230M
– –
-17,414
Closed -$43K
ABOS icon
9155
PUT
Acumen Pharmaceuticals
ABOS
$230M
– –
-58,300
Closed -$138K
ABUS icon
9156
Arbutus Biopharma
ABUS
$1.02B
– –
-15,574
Closed -$68.4K
ACDC icon
9157
PUT
ProFrac Holding
ACDC
$938M
– –
-1,900
Closed -$11.8K
ACGL icon
9158
Arch Capital
ACGL
$33.5B
– –
-3,890
Closed -$367K
ACEL icon
9159
CALL
Accel Entertainment
ACEL
$965M
– –
-8,500
Closed -$92.7K
ACHC icon
9160
Acadia Healthcare
ACHC
$2.62B
– –
-33,460
Closed -$859K
ACI icon
9161
Albertsons Companies
ACI
$6.09B
– –
-56,754
Closed -$909K
ACIC icon
9162
CALL
American Coastal Insurance
ACIC
$451M
– –
-82,900
Closed -$933K
ACIC icon
9163
PUT
American Coastal Insurance
ACIC
$451M
– –
-61,900
Closed -$696K
ACIU icon
9164
AC Immune
ACIU
$284M
– –
-6,620
Closed -$18.2K
ACIW icon
9165
CALL
ACI Worldwide
ACIW
$5.35B
– –
-700
Closed -$28.7K
ACLX
9166
CALL
DELISTED
Arcellx
ACLX
– –
-41,100
Closed -$4.72M
ACLX
9167
PUT
DELISTED
Arcellx
ACLX
– –
-39,400
Closed -$4.52M
ACNT icon
9168
CALL
Ascent Industries
ACNT
$137M
– –
-500
Closed -$6.66K
ACRE
9169
PUT
Ares Commercial Real Estate
ACRE
$254M
– –
-4,100
Closed -$19.7K
ACT icon
9170
PUT
Enact Holdings
ACT
$6.77B
– –
-200
Closed -$8.16K
ACTG icon
9171
CALL
Acacia Research
ACTG
$443M
– –
-12,700
Closed -$61.1K
ACVA icon
9172
PUT
ACV Auctions
ACVA
$1.19B
– –
-200
Closed -$848
ADBE icon
9173
Adobe
ADBE
$106B
– –
-12,528
Closed -$2.97M
ADC icon
9174
Agree Realty
ADC
$9.03B
– –
-745
Closed -$56.5K
ADP icon
9175
Automatic Data Processing
ADP
$110B
– –
-2,602
Closed -$556K
365 366
367
368 369

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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.