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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
FC icon
7226
PUT
Franklin Covey
FC
$233M
– –
-28
Closed -$66K
FCFS icon
7227
CALL
FirstCash
FCFS
$8.55B
– –
-3
Closed -$24K
FDN icon
7228
First Trust Dow Jones Internet Index Fund ETF
FDN
$4.86B
– –
-1,849
Closed -$261K
FDS icon
7229
Factset
FDS
$9.05B
– –
-2,245
Closed -$494K
FE icon
7230
FirstEnergy
FE
$28.9B
– –
-5,701
Closed -$216K
FET icon
7231
CALL
Forum Energy Technologies
FET
$654M
– –
-4
Closed -$76K
FEZ icon
7232
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.28B
– –
-8,433
Closed -$322K
FFIN icon
7233
First Financial Bankshares
FFIN
$4.97B
– –
-1,670
Closed -$50.2K
FFTY icon
7234
PUT
CapForce IBD 50 ETF
FFTY
$80.2M
– –
-19
Closed -$73K
KYNB
7235
Kyntra Bio
KYNB
$28.5M
– –
-483
Closed -$543K
FHI icon
7236
Federated Hermes
FHI
$4.4B
– –
-11,515
Closed -$286K
FHN icon
7237
PUT
First Horizon
FHN
$12.1B
– –
-40
Closed -$69K
FINV
7238
CALL
FinVolution Group
FINV
$1.12B
– –
-3
Closed -$1K
FIVN icon
7239
FIVE9
FIVN
$1.77B
– –
-47,421
Closed -$1.91M
FLNT
7240
Fluent
FLNT
$102M
– –
-536
Closed -$9.77K
FLS icon
7241
Flowserve
FLS
$9.25B
– –
-7,368
Closed -$345K
FN icon
7242
Fabrinet
FN
$17.1B
– –
-10,869
Closed -$521K
FNB icon
7243
CALL
FNB Corp
FNB
$6.78B
– –
-5
Closed -$6K
FNV icon
7244
Franco-Nevada
FNV
$41.4B
– –
-13,081
Closed -$874K
FORR icon
7245
PUT
Forrester Research
FORR
$172M
– –
-1
Closed -$4K
FR icon
7246
First Industrial Realty Trust
FR
$8.88B
– –
-58
Closed -$1K
FR icon
7247
PUT
First Industrial Realty Trust
FR
$8.88B
– –
-1
Closed -$3K
FRPT icon
7248
Freshpet
FRPT
$2.83B
– –
-718
Closed -$25K
FRPT icon
7249
PUT
Freshpet
FRPT
$2.83B
– –
-38
Closed -$139K
FSP
7250
CALL
Franklin Street Properties
FSP
$44.8M
– –
-4
Closed -$3K
288 289
290
291 292

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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.