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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
-18.41%
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
$34.1B
AUM Growth
+$2.94B
Cap. Flow
-$379M
Cap. Flow %
-1.11%
Top 10 Hldgs %
42.6%
Holding
8,576
New
1,199
Increased
2,701
Reduced
2,877
Closed
1,573

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$58.5M
2
GOOG icon
Alphabet (Google) Class C
GOOG
+$56.5M
3
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$44.1M
4
AAPL icon
Apple
AAPL
+$20.3M
5
XOP icon
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
+$12.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$109M
2
META icon
Meta Platforms (Facebook)
META
+$62.3M
3
QQQ icon
Invesco QQQ Trust
QQQ
+$36.2M
4
GS icon
Goldman Sachs
GS
+$27.1M
5
BA icon
Boeing
BA
+$24.7M

Sector Composition

Rank Sector Weight
1 Communication Services 0.49%
2 Consumer Discretionary 0.48%
3 Technology 0.4%
4 Financials 0.25%
5 Industrials 0.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
VRTX icon
7901
Vertex Pharmaceuticals
VRTX
$120B
– –
-10,342
Closed -$1.79M
VST icon
7902
Vistra
VST
$56.8B
– –
-4,765
Closed -$112K
VTWO icon
7903
Vanguard Russell 2000 ETF
VTWO
$17.3B
– –
-348
Closed -$23K
VUZI icon
7904
CALL
Vuzix
VUZI
$193M
– –
-193
Closed -$126K
VVX icon
7905
CALL
V2X
VVX
$2.62B
– –
-8
Closed -$24K
VWO icon
7906
Vanguard FTSE Emerging Markets ETF
VWO
$119B
– –
-8,385
Closed -$343K
VXUS icon
7907
Vanguard Total International Stock ETF
VXUS
$153B
– –
-174
Closed -$8.66K
VYGR icon
7908
Voyager Therapeutics
VYGR
$184M
$0 ﹤0.01%
98
-289
-75% -$3.71K
VYGR icon
7909
PUT
Voyager Therapeutics
VYGR
$184M
– –
-5
Closed -$9K
VYM icon
7910
Vanguard High Dividend Yield ETF
VYM
$80.4B
– –
-4,539
Closed -$379K
W icon
7911
Wayfair
W
$10.8B
– –
-14,342
Closed -$1.51M
WAB icon
7912
Wabtec
WAB
$50.1B
– –
-4,459
Closed -$389K
WABC icon
7913
CALL
Westamerica Bancorp
WABC
$1.38B
– –
-11
Closed -$66K
WAT icon
7914
Waters Corp
WAT
$37.7B
– –
-465
Closed -$88.3K
WDFC icon
7915
WD-40
WDFC
$3.12B
– –
-542
Closed -$91.8K
WERN icon
7916
Werner Enterprises
WERN
$2.63B
– –
-417
Closed -$13.6K
WERN icon
7917
PUT
Werner Enterprises
WERN
$2.63B
– –
-7
Closed -$24K
WGO icon
7918
Winnebago Industries
WGO
$847M
– –
-139
Closed -$3.68K
WHD icon
7919
Cactus
WHD
$3.84B
– –
-1,523
Closed -$49.9K
WIT icon
7920
Wipro
WIT
$17.6B
– –
-16,600
Closed -$31.9K
WK icon
7921
CALL
Workiva
WK
$2.84B
– –
-3
Closed -$11K
WLKP icon
7922
Westlake Chemical Partners
WLKP
$776M
– –
-341
Closed -$7.88K
WMB icon
7923
Williams Companies
WMB
$91.8B
$0 ﹤0.01%
92,391
+48,861
+112% +$1.22M
WMK icon
7924
Weis Markets
WMK
$1.84B
– –
-521
Closed -$23.6K
WMT icon
7925
Walmart Inc
WMT
$860B
– –
-19,644
Closed -$630K
315 316
317
318 319

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Simplex Trading's Q4 2018 Portfolio in Review

As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.

By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.

  • Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
  • Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
  • Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
  • Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
  • Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
  • Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.

Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.