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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
IJR icon
7526
iShares Core S&P Small-Cap ETF
IJR
$109B
– –
-3,556
Closed -$278K
IJS icon
7527
iShares S&P Small-Cap 600 Value ETF
IJS
$8.1B
– –
-52
Closed -$3K
ILF icon
7528
iShares Latin America 40 ETF
ILF
$3.79B
– –
-543
Closed -$18K
ILPT
7529
Industrial Logistics Properties Trust
ILPT
$613M
$0 ﹤0.01%
1,579
-573
-27% -$12.2K
IMKTA icon
7530
PUT
Ingles Markets
IMKTA
$1.61B
– –
-1
Closed -$3K
IMNN icon
7531
Imunon
IMNN
$6.98M
– –
-31
Closed -$10.6K
IMNN icon
7532
PUT
Imunon
IMNN
$6.98M
– –
0
– -$7K
IMO icon
7533
CALL
Imperial Oil
IMO
$62.3B
– –
-42
Closed -$116K
IMUX icon
7534
CALL
Immunic
IMUX
$195M
– –
-41
Closed -$467K
IMUX icon
7535
PUT
Immunic
IMUX
$195M
– –
0
– -$2K
INFY icon
7536
Infosys
INFY
$43.2B
– –
-64,543
Closed -$727K
INSM icon
7537
Insmed
INSM
$23.3B
– –
-1,021
Closed -$19.7K
INSP icon
7538
Inspire Medical Systems
INSP
$1.46B
– –
-5,724
Closed -$377K
INTU icon
7539
Intuit
INTU
$77B
– –
-7,036
Closed -$1.94M
IOSP icon
7540
Innospec
IOSP
$2.07B
– –
-757
Closed -$67.9K
IOSP icon
7541
PUT
Innospec
IOSP
$2.07B
– –
-1
Closed -$9K
IPGP icon
7542
IPG Photonics
IPGP
$4.09B
– –
-3,676
Closed -$487K
IPO icon
7543
PUT
Renaissance IPO ETF
IPO
$159M
– –
-9
Closed -$28K
IRT icon
7544
CALL
Independence Realty Trust
IRT
$3.87B
– –
-9
Closed -$10K
ITUB icon
7545
Itaú Unibanco
ITUB
$92B
– –
-41,340
Closed -$268K
IWB icon
7546
iShares Russell 1000 ETF
IWB
$47.7B
– –
-186
Closed -$30K
IWM icon
7547
iShares Russell 2000 ETF
IWM
$81.2B
– –
-234,093
Closed -$36.4M
IWO icon
7548
iShares Russell 2000 Growth ETF
IWO
$14.6B
– –
-702
Closed -$141K
IWR icon
7549
iShares Russell Mid-Cap ETF
IWR
$56.5B
$0 ﹤0.01%
+14
New +$783
IYT icon
7550
iShares US Transportation ETF
IYT
$2.33B
– –
-26,100
Closed -$1.23M
300 301
302
303 304

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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.