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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
SGRY icon
7726
PUT
Surgery Partners
SGRY
$1.99B
– –
-2
Closed -$3K
SGU icon
7727
CALL
Star Group
SGU
$423M
– –
-5
Closed -$4K
SHW icon
7728
Sherwin-Williams
SHW
$76.6B
– –
-9,834
Closed -$1.33M
SHYF
7729
CALL
DELISTED
The Shyft Group
SHYF
– –
-242
Closed -$356K
SIEB icon
7730
Siebert Financial
SIEB
$70.4M
– –
-400
Closed -$5.12K
SIEB icon
7731
PUT
Siebert Financial
SIEB
$70.4M
– –
-8
Closed -$11K
SIFY
7732
Sify Technologies
SIFY
$1.03B
$0 ﹤0.01%
1
– –
SIG icon
7733
Signet Jewelers
SIG
$3.48B
– –
-25,521
Closed -$1.28M
SILJ icon
7734
Amplify Junior Silver Miners ETF
SILJ
$3.28B
– –
-78
Closed -$642
SIRI icon
7735
SiriusXM
SIRI
$10.1B
– –
-3,651
Closed -$222K
SIVR icon
7736
CALL
abrdn Physical Silver Shares ETF
SIVR
$4B
– –
-4
Closed -$5K
SKX
7737
DELISTED
Skechers
SKX
– –
-36,293
Closed -$952K
SKYW icon
7738
PUT
Skywest
SKYW
$3.82B
– –
-6
Closed -$35K
SLAB icon
7739
Silicon Laboratories
SLAB
$7.15B
– –
-612
Closed -$50.9K
SLF icon
7740
PUT
Sun Life Financial
SLF
$45.1B
– –
-78
Closed -$310K
SLG icon
7741
SL Green Realty
SLG
$3.81B
– –
-2,714
Closed -$240K
SLP icon
7742
Simulations Plus
SLP
$371M
– –
-2,034
Closed -$40.2K
SLP icon
7743
PUT
Simulations Plus
SLP
$371M
– –
-8
Closed -$16K
DCOY
7744
Decoy Therapeutics
DCOY
$2.63M
– –
0
– –
SMCI icon
7745
CALL
Super Micro Computer
SMCI
$20.2B
– –
-70
Closed -$14K
SMCI icon
7746
PUT
Super Micro Computer
SMCI
$20.2B
– –
-190
Closed -$39K
SMMT icon
7747
Summit Therapeutics
SMMT
$11.6B
– –
-23,282
Closed -$51K
SMMT icon
7748
PUT
Summit Therapeutics
SMMT
$11.6B
– –
-233
Closed -$51K
SNBR
7749
DELISTED
Sleep Number
SNBR
– –
-561
Closed -$19.9K
SND icon
7750
PUT
Smart Sand
SND
$207M
– –
-39
Closed -$16K
308 309
310
311 312

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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.