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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
+3.1%
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
$149B
AUM Growth
-$28.3B
Cap. Flow
-$18.1B
Cap. Flow %
-12.12%
Top 10 Hldgs %
51.08%
Holding
10,500
New
2,156
Increased
2,652
Reduced
3,926
Closed
1,574

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$168M
2
NVDA icon
NVIDIA
NVDA
+$141M
3
TSM icon
TSMC
TSM
+$121M
4
META icon
Meta Platforms (Facebook)
META
+$107M
5
GLD icon
SPDR Gold Trust
GLD
+$103M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$174M
2
WDC icon
Western Digital
WDC
+$87.7M
3
AVGO icon
Broadcom
AVGO
+$62.2M
4
SOXL icon
Direxion Daily Semiconductor Bull 3X ETF
SOXL
+$52M
5
NFLX icon
Netflix
NFLX
+$44.6M

Sector Composition

Rank Sector Weight
1 Technology 0.62%
2 Communication Services 0.22%
3 Consumer Discretionary 0.21%
4 Healthcare 0.2%
5 Industrials 0.1%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
IFRX icon
9551
InflaRx
IFRX
$261M
– –
-24,410
Closed -$23.1K
IFRX icon
9552
PUT
InflaRx
IFRX
$261M
– –
-700
Closed -$707
IGIB icon
9553
iShares 5-10 Year Investment Grade Corporate Bond ETF
IGIB
$18.4B
– –
-58
Closed -$3.13K
IGLD icon
9554
FT Vest Gold Strategy Target Income ETF
IGLD
$516M
– –
-80
Closed -$2.16K
IHI icon
9555
iShares US Medical Devices ETF
IHI
$2.98B
– –
-696
Closed -$43.3K
IIIN icon
9556
CALL
Insteel Industries
IIIN
$614M
– –
-300
Closed -$9.5K
IIIV icon
9557
CALL
i3 Verticals
IIIV
$386M
– –
-700
Closed -$17.6K
IJS icon
9558
iShares S&P Small-Cap 600 Value ETF
IJS
$8.19B
– –
-5
Closed -$568
ILMN icon
9559
Illumina
ILMN
$29.4B
– –
-6,277
Closed -$824K
NBP
9560
NovaBridge Biosciences American Depositary Shares
NBP
$202M
– –
-3,060
Closed -$10.2K
IMAX icon
9561
IMAX
IMAX
$2.12B
– –
-2,891
Closed -$107K
IMAX icon
9562
PUT
IMAX
IMAX
$2.12B
– –
-3,900
Closed -$144K
IMKTA icon
9563
CALL
Ingles Markets
IMKTA
$1.7B
– –
-4,400
Closed -$302K
IMKTA icon
9564
PUT
Ingles Markets
IMKTA
$1.7B
– –
-100
Closed -$6.86K
IMMP
9565
Immutep
IMMP
$59.2M
– –
-9,037
Closed -$20.7K
IMMX icon
9566
CALL
Immix Biopharma
IMMX
$670M
– –
-7,800
Closed -$40.8K
IMNM icon
9567
Immunome
IMNM
$2.58B
– –
-23,401
Closed -$521K
IMTX icon
9568
CALL
Immatics
IMTX
$1.25B
– –
-500
Closed -$5.25K
INBK icon
9569
First Internet Bancorp
INBK
$231M
– –
-10,355
Closed -$217K
INBX icon
9570
Inhibrx
INBX
$1.27B
– –
-1,145
Closed -$84.9K
INDI icon
9571
indie Semiconductor
INDI
$809M
– –
-14,808
Closed -$52.3K
INGN icon
9572
CALL
Inogen
INGN
$174M
– –
-10,100
Closed -$67.9K
INGN icon
9573
PUT
Inogen
INGN
$174M
– –
-100
Closed -$672
INMB icon
9574
PUT
INmune Bio
INMB
$48.4M
– –
-5,900
Closed -$9.2K
INN
9575
Summit Hotel Properties
INN
$767M
– –
-65
Closed -$292
381 382
383
384 385

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Simplex Trading's Q1 2026 Portfolio in Review

As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.

Simplex Trading withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.

By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in Amazon worth $159M.

  • Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
  • Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
  • Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
  • Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
  • Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
  • Simplex Trading opened 2,156 new positions and closed 1,574 in Q1 2026.
  • Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.