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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
-4.36%
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
$156B
AUM Growth
-$22.4B
Cap. Flow
-$7.93B
Cap. Flow %
-5.08%
Top 10 Hldgs %
50.56%
Holding
10,070
New
1,566
Increased
3,139
Reduced
3,654
Closed
1,547

Top Buys

Rank Stock Value
1
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$272M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$99M
3
NVDA icon
NVIDIA
NVDA
+$89.9M
4
TSM icon
TSMC
TSM
+$87.7M
5
AMZN icon
Amazon
AMZN
+$61M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$518M
2
MSTR icon
Strategy Inc
MSTR
+$81.2M
3
BABA icon
Alibaba
BABA
+$66.7M
4
AMD icon
Advanced Micro Devices
AMD
+$44.3M
5
UBER icon
Uber
UBER
+$41.3M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Consumer Discretionary 0.22%
3 Healthcare 0.17%
4 Communication Services 0.15%
5 Financials 0.13%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
GE icon
8876
GE Aerospace
GE
$370B
– –
-36,453
Closed -$7.17M
GEHC icon
8877
GE HealthCare
GEHC
$27.8B
– –
-22,515
Closed -$1.93M
GFF icon
8878
Griffon
GFF
$4.2B
– –
-31
Closed -$2.29K
GFI icon
8879
Gold Fields
GFI
$29.7B
– –
-114,605
Closed -$2.1M
GFL icon
8880
GFL Environmental
GFL
$14.1B
– –
-21,970
Closed -$996K
GGR icon
8881
Gogoro
GGR
$70.3M
$0 ﹤0.01%
165
+164
+16,400% +$1.39K
GH icon
8882
Guardant Health
GH
$19.7B
– –
-5,992
Closed -$259K
GHI icon
8883
CALL
Greystone Housing Impact Investors LP
GHI
$119M
– –
-500
Closed -$5K
GHM icon
8884
Graham Corp
GHM
$1.23B
– –
-223
Closed -$8.46K
GHRS icon
8885
GH Research
GHRS
$1.9B
$0 ﹤0.01%
+17
New +$190
GIFI
8886
CALL
DELISTED
Gulf Island Fabrication
GIFI
– –
-1,500
Closed -$10K
GILD icon
8887
Gilead Sciences
GILD
$162B
– –
-32,076
Closed -$3.31M
GILT icon
8888
Gilat Satellite Networks
GILT
$837M
– –
-8,469
Closed -$58.9K
GLBS icon
8889
Globus Maritime Ltd
GLBS
$65.2M
$0 ﹤0.01%
401
-14
-3% -$18
GLDD
8890
CALL
DELISTED
Great Lakes Dredge & Dock
GLDD
– –
-252,200
Closed -$2.85M
GLL icon
8891
ProShares UltraShort Gold
GLL
$126M
– –
-345
Closed -$24K
GLW icon
8892
Corning
GLW
$131B
– –
-33,029
Closed -$1.63M
GME icon
8893
GameStop
GME
$9.63B
– –
-46,687
Closed -$1.22M
GMED icon
8894
Globus Medical
GMED
$10.5B
– –
-5,137
Closed -$424K
MRDN
8895
Meridian Holdings Inc
MRDN
$162M
– –
-345
Closed -$8K
GMS
8896
DELISTED
GMS Inc
GMS
– –
-113
Closed -$9K
GMS
8897
PUT
DELISTED
GMS Inc
GMS
– –
-300
Closed -$25K
GNL icon
8898
Global Net Lease
GNL
$1.89B
– –
-28,361
Closed -$213K
GNSS icon
8899
CALL
Genasys
GNSS
$76.1M
– –
-2,400
Closed -$6K
GNSS icon
8900
Genasys
GNSS
$76.1M
$0 ﹤0.01%
+4
New +$11
354 355
356
357 358

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Simplex Trading's Q1 2025 Portfolio in Review

As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.

Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.

  • Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
  • Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
  • Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
  • Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
  • Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
  • Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
  • Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.

Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.