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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
LOOP icon
9676
PUT
Loop Industries
LOOP
$44.8M
– –
-100
Closed -$100
LOPE icon
9677
CALL
Grand Canyon Education
LOPE
$3.63B
– –
-400
Closed -$66.5K
LOVE icon
9678
LoveSac
LOVE
$247M
– –
-11,247
Closed -$149K
LPLA icon
9679
LPL Financial
LPLA
$26.2B
– –
-2,592
Closed -$870K
LPX icon
9680
PUT
Louisiana-Pacific
LPX
$5.07B
– –
-7,400
Closed -$598K
LRMR icon
9681
Larimar Therapeutics
LRMR
$418M
– –
-30,522
Closed -$122K
LSPD icon
9682
PUT
Lightspeed Commerce
LSPD
$1.28B
– –
-10,800
Closed -$130K
LTC
9683
LTC Properties
LTC
$2.16B
– –
-2,477
Closed -$93.1K
LTRX icon
9684
PUT
Lantronix
LTRX
$246M
– –
-300
Closed -$1.76K
LUMN icon
9685
Lumen
LUMN
$6.9B
– –
-338,757
Closed -$2.56M
LUNG icon
9686
CALL
Pulmonx
LUNG
$51.1M
– –
-3,700
Closed -$8.18K
LUNR icon
9687
Intuitive Machines
LUNR
$2.26B
– –
-46,544
Closed -$858K
LUV icon
9688
Southwest Airlines
LUV
$23.3B
– –
-268,783
Closed -$12.1M
LVO icon
9689
LiveOne
LVO
$70.8M
– –
-2,070
Closed -$9.77K
LXRX icon
9690
Lexicon Pharmaceuticals
LXRX
$999M
– –
-14,758
Closed -$21.5K
LYFT icon
9691
Lyft
LYFT
$5.57B
– –
-543,126
Closed -$8.41M
LZB icon
9692
CALL
La-Z-Boy
LZB
$1.57B
– –
-600
Closed -$22.4K
LZM icon
9693
CALL
Lifezone Metals
LZM
$301M
– –
-400
Closed -$1.71K
MAC icon
9694
CALL
Macerich
MAC
$7.19B
– –
-6,200
Closed -$114K
MAMA icon
9695
Mama's Creations
MAMA
$801M
– –
-2,733
Closed -$41.5K
MANH icon
9696
CALL
Manhattan Associates
MANH
$8.82B
– –
-200
Closed -$34.7K
MAPS
9697
DELISTED
WM TECHNOLOGY INC A
MAPS
– –
-62,047
Closed -$45.5K
MARA icon
9698
Marathon Digital Holdings
MARA
$4.73B
– –
-27,666
Closed -$250K
MASS icon
9699
CALL
908 Devices
MASS
$297M
– –
-2,300
Closed -$12.1K
MASS icon
9700
PUT
908 Devices
MASS
$297M
– –
-1,600
Closed -$8.4K
386 387
388
389 390

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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.