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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
-2.07%
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
$35.2B
AUM Growth
-$1.49B
Cap. Flow
-$310M
Cap. Flow %
-0.88%
Top 10 Hldgs %
32.67%
Holding
8,410
New
1,312
Increased
3,129
Reduced
2,596
Closed
1,163

Top Buys

Rank Stock Value
1
BABA icon
Alibaba
BABA
+$50.3M
2
BA icon
Boeing
BA
+$24.3M
3
GLD icon
SPDR Gold Trust
GLD
+$18.3M
4
BIIB icon
Biogen
BIIB
+$15.9M
5
FDX icon
FedEx
FDX
+$15.1M

Top Sells

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$60.3M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$36.4M
3
NFLX icon
Netflix
NFLX
+$19M
4
XLI icon
State Street Industrial Select Sector SPDR ETF
XLI
+$17.3M
5
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$14.2M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 0.49%
2 Technology 0.48%
3 Healthcare 0.35%
4 Industrials 0.35%
5 Communication Services 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
RJET
7626
PUT
Republic Airways Holdings
RJET
$765M
– –
0
– -$1K
MGA icon
7627
Magna International
MGA
$17.9B
– –
-1,474
Closed -$73.5K
MGY icon
7628
CALL
Magnolia Oil & Gas
MGY
$4.73B
– –
-10
Closed -$11K
MHK icon
7629
Mohawk Industries
MHK
$6.71B
– –
-410
Closed -$52.6K
KG
7630
CALL
Kestrel Group
KG
$71.3M
– –
-2
Closed -$2K
MIND icon
7631
MIND Technology
MIND
$50M
– –
-37
Closed -$1.39K
MIND icon
7632
PUT
MIND Technology
MIND
$50M
– –
0
– -$1K
MITT
7633
TPG Mortgage Investment Trust
MITT
$231M
$0 ﹤0.01%
14
-6,461
-100% -$305K
MKL icon
7634
CALL
Markel Group
MKL
$24.5B
– –
-9
Closed -$980K
MLR icon
7635
CALL
Miller Industries
MLR
$584M
– –
-1
Closed -$3K
MMM icon
7636
3M
MMM
$87.5B
– –
-42,245
Closed -$5.91M
MMS icon
7637
Maximus
MMS
$3.02B
– –
-165
Closed -$12.5K
MMS icon
7638
PUT
Maximus
MMS
$3.02B
– –
-32
Closed -$232K
MNST icon
7639
Monster Beverage
MNST
$91.5B
– –
-5,846
Closed -$177K
MOD icon
7640
Modine Manufacturing
MOD
$13.3B
– –
-345
Closed -$4K
MOD icon
7641
PUT
Modine Manufacturing
MOD
$13.3B
– –
-16
Closed -$22K
MODV
7642
DELISTED
ModivCare
MODV
– –
-121
Closed -$6.89K
MPAA icon
7643
Motorcar Parts of America
MPAA
$256M
– –
-49
Closed -$819
MPAA icon
7644
PUT
Motorcar Parts of America
MPAA
$256M
– –
-1
Closed -$2K
MPC icon
7645
Marathon Petroleum
MPC
$91.2B
– –
-16,948
Closed -$893K
MPWR icon
7646
Monolithic Power Systems
MPWR
$68.6B
– –
-2,418
Closed -$362K
MPX
7647
PUT
DELISTED
Marine Products Corp
MPX
– –
-1
Closed -$1K
MRK icon
7648
Merck
MRK
$322B
– –
-52,315
Closed -$4.19M
MSA icon
7649
Mine Safety
MSA
$6.72B
– –
-402
Closed -$42.4K
MSA icon
7650
PUT
Mine Safety
MSA
$6.72B
– –
-27
Closed -$284K
304 305
306
307 308

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Simplex Trading's Q3 2019 Portfolio in Review

As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.

Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
  • Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
  • Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
  • Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
  • Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
  • Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
  • Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.

Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.