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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
-4.08%
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
$127B
AUM Growth
+$5.5B
Cap. Flow
+$11.9B
Cap. Flow %
9.37%
Top 10 Hldgs %
44.01%
Holding
10,417
New
1,399
Increased
3,690
Reduced
3,364
Closed
1,719

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$113M
2
GLD icon
SPDR Gold Trust
GLD
+$68.6M
3
NVDA icon
NVIDIA
NVDA
+$63.4M
4
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$55.2M
5
AAPL icon
Apple
AAPL
+$54.9M

Top Sells

Rank Stock Value
1
NFLX icon
Netflix
NFLX
+$27.1M
2
QCOM icon
Qualcomm
QCOM
+$24.6M
3
DIS icon
Walt Disney
DIS
+$21.2M
4
AMD icon
Advanced Micro Devices
AMD
+$18.2M
5
SNOW icon
Snowflake
SNOW
+$16.1M

Sector Composition

Rank Sector Weight
1 Technology 0.44%
2 Consumer Discretionary 0.32%
3 Healthcare 0.22%
4 Financials 0.17%
5 Communication Services 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
LQDT icon
9301
CALL
Liquidity Services
LQDT
$1.17B
– –
-1,600
Closed -$26K
LRCX icon
9302
Lam Research
LRCX
$400B
– –
-67,200
Closed -$4.41M
LRMR icon
9303
CALL
Larimar Therapeutics
LRMR
$417M
– –
-6,100
Closed -$19K
LRN icon
9304
Stride
LRN
$3.66B
– –
-15,335
Closed -$624K
LSAK icon
9305
CALL
Lesaka Technologies
LSAK
$408M
– –
-500
Closed -$1K
LSCC icon
9306
Lattice Semiconductor
LSCC
$18.9B
– –
-2,392
Closed -$216K
LSTR icon
9307
Landstar System
LSTR
$7.06B
– –
-454
Closed -$87.2K
LTH icon
9308
Life Time Group Holdings
LTH
$9.33B
– –
-8,395
Closed -$148K
LTRX icon
9309
PUT
Lantronix
LTRX
$249M
– –
-2,500
Closed -$10K
LVLU icon
9310
CALL
Lulu's Fashion Lounge
LVLU
$53M
– –
-60
Closed -$2K
LVLU icon
9311
Lulu's Fashion Lounge
LVLU
$53M
– –
-112
Closed -$4K
LVLU icon
9312
PUT
Lulu's Fashion Lounge
LVLU
$53M
– –
-180
Closed -$6K
LVTX
9313
DELISTED
LAVA Therapeutics
LVTX
$0 ﹤0.01%
674
-468
-41% -$837
LVWR icon
9314
LiveWire
LVWR
$158M
– –
-44,763
Closed -$476K
LXP icon
9315
LXP Industrial Trust
LXP
$3.53B
– –
-21
Closed -$1K
LXRX icon
9316
Lexicon Pharmaceuticals
LXRX
$1.02B
– –
-20,926
Closed -$36.7K
LXRX icon
9317
PUT
Lexicon Pharmaceuticals
LXRX
$1.02B
– –
-6,900
Closed -$15K
LYEL icon
9318
Lyell Immunopharma
LYEL
$313M
$0 ﹤0.01%
+28
New +$1.33K
LYG icon
9319
Lloyds Banking Group
LYG
$87B
– –
-3,168
Closed -$6.87K
LYRA
9320
DELISTED
LYRA THERAPEUTICS INC
LYRA
$0 ﹤0.01%
2
-34
-94% -$6.08K
LYTS icon
9321
LSI Industries
LYTS
$860M
– –
-213
Closed -$2.97K
LZB icon
9322
La-Z-Boy
LZB
$1.55B
– –
-2,541
Closed -$78.2K
LZB icon
9323
PUT
La-Z-Boy
LZB
$1.55B
– –
-2,200
Closed -$63K
MAN icon
9324
ManpowerGroup
MAN
$2.32B
– –
-163
Closed -$12.7K
MARA icon
9325
Marathon Digital Holdings
MARA
$4.87B
– –
-55,645
Closed -$747K
371 372
373
374 375

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Simplex Trading's Q3 2023 Portfolio in Review

As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.

Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.

By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.

On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.

  • Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
  • Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
  • Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
  • Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
  • Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
  • Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
  • Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.

Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.