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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

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
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$175B
AUM Growth
+$18.5B
Cap. Flow
-$10.5B
Cap. Flow %
-6.03%
Top 10 Hldgs %
47.16%
Holding
10,048
New
1,525
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 Technology 0.74%
2 Communication Services 0.19%
3 Consumer Discretionary 0.18%
4 Healthcare 0.17%
5 Financials 0.14%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SFL icon
9626
SFL Corp
SFL
$1.51B
– –
-11,896
Closed -$98.7K
SFIX
9627
Stitch Fix
SFIX
$500M
– –
-52,767
Closed -$198K
SGC icon
9628
Superior Group of Companies
SGC
$202M
– –
-28
Closed -$285
SGC icon
9629
PUT
Superior Group of Companies
SGC
$202M
– –
-1,000
Closed -$10K
SGHT icon
9630
CALL
Sight Sciences
SGHT
$274M
– –
-9,300
Closed -$22K
SGML icon
9631
Sigma Lithium
SGML
$1.14B
– –
-4,420
Closed -$29.2K
SGU icon
9632
PUT
Star Group
SGU
$424M
– –
-100
Closed -$1K
SHC icon
9633
PUT
Sotera Health
SHC
$4.93B
– –
-200
Closed -$2K
SHY icon
9634
iShares 1-3 Year Treasury Bond ETF
SHY
$25.4B
– –
-8,405
Closed -$695K
SHYF
9635
DELISTED
The Shyft Group
SHYF
– –
-663
Closed -$5K
SHYF
9636
PUT
DELISTED
The Shyft Group
SHYF
– –
-1,500
Closed -$12K
SIEB icon
9637
Siebert Financial
SIEB
$67.6M
– –
-3,902
Closed -$15.8K
SIEB icon
9638
PUT
Siebert Financial
SIEB
$67.6M
– –
-4,100
Closed -$12K
SIFY
9639
Sify Technologies
SIFY
$1.06B
– –
-48
Closed –
SILJ icon
9640
Amplify Junior Silver Miners ETF
SILJ
$3.41B
– –
-5,617
Closed -$68K
SITC icon
9641
SITE Centers
SITC
$224M
– –
-2,270
Closed -$27.2K
SJM icon
9642
J.M. Smucker
SJM
$12.6B
– –
-24,414
Closed -$2.68M
SJT
9643
San Juan Basin Royalty Trust
SJT
$117M
– –
-68,180
Closed -$414K
SKE
9644
Skeena Resources
SKE
$3.5B
– –
-12,049
Closed -$152K
SKIN icon
9645
SkinHealth Systems
SKIN
$97.8M
– –
-4,550
Closed -$6.41K
FIRY
9646
Firy Inc
FIRY
$130M
– –
-348
Closed -$1.93K
SKWD icon
9647
CALL
Skyward Specialty Insurance
SKWD
$2.35B
– –
-100
Closed -$5K
SKYH icon
9648
CALL
Sky Harbour Group
SKYH
$358M
– –
-1,400
Closed -$18K
SLAB icon
9649
Silicon Laboratories
SLAB
$7.16B
– –
-74
Closed -$8.75K
SLDB icon
9650
Solid Biosciences
SLDB
$797M
– –
-1,095
Closed -$3.87K
384 385
386
387 388

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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 withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.

  • 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 1,525 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.