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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
+14.57%
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
$45.7B
AUM Growth
+$10.6B
Cap. Flow
+$229M
Cap. Flow %
0.5%
Top 10 Hldgs %
38.52%
Holding
8,523
New
1,277
Increased
3,072
Reduced
2,710
Closed
1,251

Top Buys

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$70.1M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$46.6M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$37.4M
4
AMZN icon
Amazon
AMZN
+$37M
5
TSLA icon
Tesla
TSLA
+$28M

Top Sells

Rank Stock Value
1
BABA icon
Alibaba
BABA
+$41M
2
BA icon
Boeing
BA
+$27.8M
3
BIIB icon
Biogen
BIIB
+$18.9M
4
GLD icon
SPDR Gold Trust
GLD
+$18.3M
5
DIA icon
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
+$13.6M

Sector Composition

Rank Sector Weight
1 Technology 0.75%
2 Consumer Discretionary 0.58%
3 Communication Services 0.33%
4 Healthcare 0.31%
5 Industrials 0.19%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TAK icon
7951
Takeda Pharmaceutical
TAK
$53.9B
– –
-2,166
Closed -$41.4K
TAP icon
7952
Molson Coors Class B
TAP
$7.7B
– –
-2,989
Closed -$161K
TBI
7953
Trueblue
TBI
$254M
– –
-763
Closed -$17.4K
TBI
7954
PUT
Trueblue
TBI
$254M
– –
-20
Closed -$42K
TBT icon
7955
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$292M
– –
-109,510
Closed -$2.67M
TCMD icon
7956
PUT
Tactile Systems Technology
TCMD
$623M
– –
-6
Closed -$25K
TCPC icon
7957
BlackRock TCP Capital
TCPC
$268M
– –
-48
Closed -$670
TCOM icon
7958
Trip.com Group
TCOM
$26.8B
– –
-22,557
Closed -$727K
TDG icon
7959
TransDigm Group
TDG
$66.8B
– –
-3,114
Closed -$1.7M
TDY icon
7960
PUT
Teledyne Technologies
TDY
$30.1B
– –
-1
Closed -$32K
TENB icon
7961
Tenable Holdings
TENB
$3.62B
– –
-5,321
Closed -$130K
TEVA icon
7962
Teva Pharmaceuticals
TEVA
$35.1B
– –
-180,136
Closed -$1.61M
TEX icon
7963
Terex
TEX
$7.66B
– –
-5,110
Closed -$144K
TFX icon
7964
PUT
Teleflex
TFX
$5.97B
– –
-2
Closed -$67K
THS
7965
DELISTED
Treehouse Foods
THS
– –
-2,365
Closed -$121K
TISI icon
7966
CALL
Team
TISI
$76.3M
– –
0
– -$1K
TKC icon
7967
Turkcell
TKC
$5.11B
– –
-3,101
Closed -$17.7K
TK icon
7968
CALL
Teekay
TK
$968M
– –
-335
Closed -$134K
TME icon
7969
Tencent Music
TME
$14.4B
– –
-43,075
Closed -$553K
TNC icon
7970
Tennant Co
TNC
$1.47B
– –
-322
Closed -$22K
TNC icon
7971
PUT
Tennant Co
TNC
$1.47B
– –
-81
Closed -$572K
TNET icon
7972
TriNet
TNET
$2.76B
– –
-523
Closed -$29.1K
TNK icon
7973
Teekay Tankers
TNK
$2.59B
– –
-989
Closed -$18K
TNL icon
7974
Travel + Leisure Co
TNL
$4.72B
– –
-4,713
Closed -$226K
TOL icon
7975
Toll Brothers
TOL
$13.9B
– –
-19,717
Closed -$788K
317 318
319
320 321

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Simplex Trading's Q4 2019 Portfolio in Review

As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.

Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.

By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.

  • Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
  • Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
  • Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
  • Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
  • Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
  • Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.

Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.