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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
+21.82%
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
$175B
AUM Growth
+$18.5B
Cap. Flow
+$450M
Cap. Flow %
0.26%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,524
Increased
3,308
Reduced
3,590
Closed
1,431

Top Buys

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$172M
2
AAPL icon
Apple
AAPL
+$156M
3
AVGO icon
Broadcom
AVGO
+$101M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$57.2M
5
UNH icon
UnitedHealth
UNH
+$55.1M

Top Sells

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$140M
2
AMZN icon
Amazon
AMZN
+$47.9M
3
NFLX icon
Netflix
NFLX
+$38.3M
4
TSM icon
TSMC
TSM
+$37.3M
5
PFE icon
Pfizer
PFE
+$36.9M

Sector Composition

Rank Sector Weight
1 Miscellaneous 98.27%
2 Technology 0.74%
3 Communication Services 0.19%
4 Consumer Discretionary 0.18%
5 Healthcare 0.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
OII icon
9426
PUT
Oceaneering
OII
$5.12B
– –
-600
Closed -$13K
OIS icon
9427
PUT
Oil States International
OIS
$528M
– –
-1,500
Closed -$7K
OLO
9428
PUT
DELISTED
Olo Inc
OLO
– –
-8,000
Closed -$48K
OLPX
9429
PUT
DELISTED
Olaplex Holdings
OLPX
– –
-900
Closed -$1K
OM icon
9430
Outset Medical
OM
$67.5M
– –
-5,043
Closed -$78.7K
OMER icon
9431
Omeros
OMER
$1.37B
– –
-63,465
Closed -$316K
ONB icon
9432
Old National Bancorp
ONB
$9.96B
– –
-4,013
Closed -$83K
ONB icon
9433
PUT
Old National Bancorp
ONB
$9.96B
– –
-9,700
Closed -$205K
ONEW icon
9434
OneWater Marine
ONEW
$212M
$0 ﹤0.01%
+19
New +$269
ONL
9435
Orion Office REIT
ONL
$155M
– –
-994
Closed -$1.89K
OOMA icon
9436
Ooma
OOMA
$637M
– –
-183
Closed -$2.33K
OOMA icon
9437
PUT
Ooma
OOMA
$637M
– –
-100
Closed -$1K
OOTO
9438
DELISTED
Direxion Daily Travel & Vacation Bull 2X Shares
OOTO
– –
-100
Closed -$1K
OPAD icon
9439
PUT
Offerpad Solutions Inc. Class A Common Stock
OPAD
$19.8M
– –
-660
Closed -$10K
OPAL icon
9440
OPAL Fuels
OPAL
$61M
– –
-2,900
Closed -$6.74K
OPCH icon
9441
Option Care Health
OPCH
$3.63B
– –
-4,699
Closed -$152K
OPI
9442
CALL
DELISTED
Office Properties Income Trust
OPI
– –
-2,200
Closed -$1K
OPRA
9443
Opera Ltd
OPRA
$1.67B
– –
-1,635
Closed -$28K
OPRT icon
9444
PUT
Oportun Financial
OPRT
$362M
– –
-3,400
Closed -$18K
OPRX icon
9445
PUT
OptimizeRx
OPRX
$148M
– –
-111,000
Closed -$961K
OR icon
9446
CALL
OR Royalties Inc
OR
$6.99B
– –
-34,000
Closed -$718K
OR icon
9447
PUT
OR Royalties Inc
OR
$6.99B
– –
-2,200
Closed -$46K
ORGN
9448
PUT
DELISTED
Origin Materials
ORGN
– –
-1,630
Closed -$32K
ORIC icon
9449
Oric Pharmaceuticals
ORIC
$1.33B
– –
-146
Closed -$980
ORIC icon
9450
PUT
Oric Pharmaceuticals
ORIC
$1.33B
– –
-1,000
Closed -$5K
376 377
378
379 380

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Simplex Trading's Q2 2025 Portfolio in Review

As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.

Simplex Trading's Q2 2025 filing shows 1,524 new, 3,308 increased, 3,590 reduced and 1,431 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $140M.

By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 99% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
  • Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
  • Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
  • Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
  • Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
  • Simplex Trading opened 1,524 new positions and closed 1,431 in Q2 2025.
  • Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.

Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.