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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
ACRS icon
8376
PUT
Aclaris Therapeutics
ACRS
$730M
– –
-25,900
Closed -$64K
ACT icon
8377
CALL
Enact Holdings
ACT
$6.53B
– –
-800
Closed -$25K
ACTG icon
8378
CALL
Acacia Research
ACTG
$450M
– –
-32,500
Closed -$141K
ACXP icon
8379
Acurx Pharmaceuticals
ACXP
$6.1M
$0 ﹤0.01%
+70
New +$943
ADBE icon
8380
Adobe
ADBE
$89.5B
– –
-32,959
Closed -$14.1M
ADCT icon
8381
CALL
ADC Therapeutics
ADCT
$146M
– –
-2,000
Closed -$3K
ADCT icon
8382
ADC Therapeutics
ADCT
$146M
– –
-5,291
Closed -$8.99K
ADCT icon
8383
PUT
ADC Therapeutics
ADCT
$146M
– –
-4,300
Closed -$8K
ADI icon
8384
Analog Devices
ADI
$181B
– –
-7,475
Closed -$1.62M
ADNT icon
8385
Adient
ADNT
$1.6B
– –
-30,979
Closed -$498K
ADSE icon
8386
CALL
ADS-TEC Energy
ADSE
$902M
– –
-500
Closed -$7K
ADTN icon
8387
Adtran
ADTN
$798M
– –
-30,121
Closed -$303K
AEG icon
8388
Aegon
AEG
$13.5B
– –
-3,905
Closed -$25K
AEHR icon
8389
Aehr Test Systems
AEHR
$2.48B
– –
-14,515
Closed -$161K
AEM icon
8390
Agnico Eagle Mines
AEM
$72.6B
– –
-167,150
Closed -$16M
AFCG
8391
AFC Gamma
AFCG
$58.6M
$0 ﹤0.01%
+39
New +$310
AFCG
8392
PUT
AFC Gamma
AFCG
$58.6M
– –
-200
Closed -$1K
AGEN
8393
Agenus
AGEN
$249M
$0 ﹤0.01%
+88
New +$253
AGI icon
8394
Alamos Gold
AGI
$12.4B
– –
-106,095
Closed -$2.39M
AGIO icon
8395
PUT
Agios Pharmaceuticals
AGIO
$2.16B
– –
-500
Closed -$16K
AGM icon
8396
Federal Agricultural Mortgage
AGM
$2.27B
– –
-70
Closed -$13K
AGO icon
8397
PUT
Assured Guaranty
AGO
$3.78B
– –
-100
Closed -$9K
AGX icon
8398
Argan
AGX
$7.98B
– –
-1,323
Closed -$185K
AGS
8399
DELISTED
PlayAGS
AGS
– –
-70
Closed -$840
AHCO icon
8400
AdaptHealth
AHCO
$1.46B
– –
-90,502
Closed -$911K
334 335
336
337 338

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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.