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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
BELFB
6426
CALL
Bel Fuse Inc Class B
BELFB
$3.88B
$7K ﹤0.01%
+5
New +$69
BOKF icon
6427
PUT
BOK Financial
BOKF
$8.64B
$7K ﹤0.01%
1
-1
-50% -$78
BRY
6428
DELISTED
Berry Corp
BRY
$7K ﹤0.01%
+844
New +$7.95K
CCEP icon
6429
Coca-Cola Europacific Partners
CCEP
$46.5B
$7K ﹤0.01%
+143
New +$7.99K
CENT icon
6430
Central Garden & Pet Co
CENT
$2.74B
$7K ﹤0.01%
340
-670
-66% -$14.5K
CGEN icon
6431
CALL
Compugen
CGEN
$216M
$7K ﹤0.01%
17
+4
+31% +$15
CNS icon
6432
Cohen & Steers
CNS
$4.18B
$7K ﹤0.01%
145
+45
+45% +$2.38K
CTRN icon
6433
Citi Trends
CTRN
$524M
$7K ﹤0.01%
+400
New +$6.5K
CTSO icon
6434
PUT
Cytosorbents Corp
CTSO
$22.6M
$7K ﹤0.01%
14
-16
-53% -$93
DOYU
6435
DouYu International Holdings
DOYU
$136M
$7K ﹤0.01%
+86
New +$7.94K
DRD
6436
DRDGold
DRD
$1.82B
$7K ﹤0.01%
+1,668
New +$6.26K
DRRX
6437
PUT
DELISTED
DURECT Corp
DRRX
$7K ﹤0.01%
+4
New +$54
EYPT icon
6438
EyePoint Inc
EYPT
$1.02B
$7K ﹤0.01%
441
-2,055
-82% -$31.8K
GIL icon
6439
PUT
Gildan
GIL
$9.25B
$7K ﹤0.01%
2
-53
-96% -$1.99K
GSAT icon
6440
PUT
Globalstar
GSAT
$10.2B
$7K ﹤0.01%
11
+7
+175% +$44
H icon
6441
PUT
Hyatt Hotels
H
$17.6B
$7K ﹤0.01%
1
-3
-75% -$227
HCSG icon
6442
PUT
Healthcare Services Group
HCSG
$1.56B
$7K ﹤0.01%
+3
New +$76
HROW icon
6443
CALL
Harrow
HROW
$1.43B
$7K ﹤0.01%
14
-738
-98% -$4.83K
IDT icon
6444
IDT Corp
IDT
$1.6B
$7K ﹤0.01%
+719
New +$7.18K
IRTC icon
6445
CALL
iRhythm Holdings
IRTC
$3.59B
$7K ﹤0.01%
+1
New +$77
ITRI icon
6446
CALL
Itron
ITRI
$3.73B
$7K ﹤0.01%
1
-3
-75% -$202
LQDT icon
6447
CALL
Liquidity Services
LQDT
$1.17B
$7K ﹤0.01%
+10
New +$69
LX
6448
CALL
LexinFintech Holdings
LX
$244M
$7K ﹤0.01%
7
-17
-71% -$185
MMS icon
6449
CALL
Maximus
MMS
$3.14B
$7K ﹤0.01%
1
-8
-89% -$607
MOV icon
6450
CALL
Movado Group
MOV
$812M
$7K ﹤0.01%
3
-28
-90% -$695
256 257
258
259 260

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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.