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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
+2.14%
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
$860M
AUM Growth
+$34.4M
Cap. Flow
-$17.8M
Cap. Flow %
-2.07%
Top 10 Hldgs %
14.96%
Holding
6,670
New
1,973
Increased
1,386
Reduced
1,513
Closed
1,643

Top Buys

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$40.1M
2
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$12.5M
3
BABA icon
Alibaba
BABA
+$10.5M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$9.89M
5
INTC icon
Intel
INTC
+$9.83M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$35.7M
2
GILD icon
Gilead Sciences
GILD
+$32.3M
3
AMZN icon
Amazon
AMZN
+$29M
4
BKNG icon
Booking.com
BKNG
+$28.4M
5
BIDU icon
Baidu
BIDU
+$13.3M

Sector Composition

Rank Sector Weight
1 Communication Services 7.76%
2 Consumer Discretionary 7.62%
3 Healthcare 7.24%
4 Technology 6.95%
5 Financials 4.83%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SEE
3701
CALL
DELISTED
Sealed Air
SEE
$4K ﹤0.01%
18
-374
-95% -$16.6K
SJT
3702
PUT
San Juan Basin Royalty Trust
SJT
$117M
$4K ﹤0.01%
9
– –
SNBR
3703
PUT
DELISTED
Sleep Number
SNBR
$4K ﹤0.01%
36
+26
+260% +$808
SNEX icon
3704
CALL
StoneX
SNEX
$8.99B
$4K ﹤0.01%
+56
New +$269
SOHU
3705
PUT
Sohu.com
SOHU
$346M
$4K ﹤0.01%
8
-32
-80% -$1.69K
SPEU icon
3706
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$719M
$4K ﹤0.01%
+70
New +$2.45K
STRA icon
3707
PUT
Strategic Education
STRA
$1.84B
$4K ﹤0.01%
4
-18
-82% -$1.16K
TEL icon
3708
CALL
TE Connectivity
TEL
$62.1B
$4K ﹤0.01%
+27
New +$1.85K
TFC icon
3709
CALL
Truist Financial
TFC
$64.7B
$4K ﹤0.01%
+44
New +$1.66K
TG icon
3710
PUT
Tredegar Corp
TG
$263M
$4K ﹤0.01%
38
+12
+46% +$252
TNET icon
3711
PUT
TriNet
TNET
$3.14B
$4K ﹤0.01%
+69
New +$2.38K
ULE icon
3712
ProShares Ultra Euro
ULE
$4.29M
$4K ﹤0.01%
+300
New +$5.14K
UUUU icon
3713
PUT
Energy Fuels
UUUU
$2.83B
$4K ﹤0.01%
15
– –
VRA icon
3714
CALL
Vera Bradley
VRA
$104M
$4K ﹤0.01%
55
+39
+244% +$719
WNS
3715
CALL
DELISTED
WNS Holdings
WNS
$4K ﹤0.01%
+10
New +$233
XPO icon
3716
PUT
XPO
XPO
$24B
$4K ﹤0.01%
494
+109
+28% +$1.58K
PRKS icon
3717
CALL
United Parks & Resorts
PRKS
$2.21B
$4K ﹤0.01%
24
-31
-56% -$571
NBIS
3718
CALL
Nebius Group N.V.
NBIS
$43.1B
$4K ﹤0.01%
+58
New +$933
ENFY
3719
PUT
DELISTED
Enlightify Inc
ENFY
$4K ﹤0.01%
5
+3
+150% +$65
TPC
3720
PUT
Tutor Perini Cor
TPC
$4.31B
$4K ﹤0.01%
+13
New +$305
BCPC
3721
CALL
Balchem Corp
BCPC
$5.33B
$4K ﹤0.01%
+20
New +$1.15K
BERY
3722
PUT
DELISTED
Berry Global Group, Inc.
BERY
$4K ﹤0.01%
+42
New +$1.32K
ATSG
3723
CALL
DELISTED
Air Transport Services Group
ATSG
$4K ﹤0.01%
+11
New +$96
VOXX
3724
DELISTED
VOXX International Corporation Class A
VOXX
$4K ﹤0.01%
+511
New +$4.33K
ERF
3725
PUT
DELISTED
Enerplus Corporation
ERF
$4K ﹤0.01%
37
-20
-35% -$198
147 148
149
150 151

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Simplex Trading's Q1 2015 Portfolio in Review

As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.

Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.

By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
  • Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
  • Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
  • Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
  • Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
  • Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
  • Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.

Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.