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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
GTX icon
7476
CALL
Garrett Motion
GTX
$5.9B
– –
-180
Closed -$276K
GTX icon
7477
Garrett Motion
GTX
$5.9B
$0 ﹤0.01%
21,071
+9,268
+79% +$114K
GTX icon
7478
PUT
Garrett Motion
GTX
$5.9B
– –
-208
Closed -$319K
GWRE icon
7479
Guidewire Software
GWRE
$10.9B
– –
-11,318
Closed -$1.14M
GXC icon
7480
State Street SPDR S&P China ETF
GXC
$447M
– –
-13,010
Closed -$1.24M
GYRE icon
7481
CALL
Gyre Therapeutics
GYRE
$670M
– –
-1
Closed -$7K
H icon
7482
Hyatt Hotels
H
$17.3B
– –
-310
Closed -$23.4K
HALO icon
7483
Halozyme
HALO
$9.59B
– –
-9,071
Closed -$149K
HBI
7484
DELISTED
Hanesbrands
HBI
– –
-17,680
Closed -$269K
HCKT icon
7485
Hackett Group
HCKT
$234M
– –
-78
Closed -$1.28K
HDB icon
7486
HDFC Bank
HDB
$119B
– –
-60,504
Closed -$1.72M
HDGE icon
7487
AdvisorShares Ranger Equity Bear ETF
HDGE
$64.9M
– –
-18
Closed -$1K
HDSN
7488
Hudson Technologies
HDSN
$266M
$0 ﹤0.01%
200
-13,796
-99% -$8.55K
HDSN
7489
PUT
Hudson Technologies
HDSN
$266M
– –
-110
Closed -$9K
HE icon
7490
Hawaiian Electric Industries
HE
$2.34B
– –
-211
Closed -$9.38K
HEDJ icon
7491
WisdomTree Europe Hedged Equity Fund
HEDJ
$1.8B
– –
-2,482
Closed -$82K
HEI icon
7492
HEICO Corp
HEI
$47.6B
– –
-13,971
Closed -$1.87M
HI
7493
PUT
DELISTED
Hillenbrand
HI
– –
-4
Closed -$15K
HIW icon
7494
Highwoods Properties
HIW
$3.61B
– –
-483
Closed -$21.2K
HLF icon
7495
Herbalife
HLF
$1.22B
– –
-43,577
Closed -$1.7M
HLIT icon
7496
CALL
Harmonic Inc
HLIT
$1.26B
– –
-5
Closed -$2K
HLIT icon
7497
Harmonic Inc
HLIT
$1.26B
– –
-6,868
Closed -$47.6K
HLI icon
7498
Houlihan Lokey
HLI
$9.52B
– –
-232
Closed -$10K
HOMB icon
7499
Home BancShares
HOMB
$6.16B
– –
-5,346
Closed -$99.9K
HOV icon
7500
CALL
Hovnanian Enterprises
HOV
$767M
– –
-3
Closed -$2K
298 299
300
301 302

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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.