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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
GATX icon
2776
GATX Corp
GATX
$6.55B
$12K ﹤0.01%
+211
New +$12.3K
GPC icon
2777
PUT
Genuine Parts
GPC
$17.1B
$12K ﹤0.01%
56
+17
+44% +$1.64K
GRFS
2778
Grifois
GRFS
$5.16B
$12K ﹤0.01%
762
-4,022
-84% -$67.3K
HLT icon
2779
CALL
Hilton Worldwide
HLT
$74B
$12K ﹤0.01%
15
+10
+200% +$826
HR icon
2780
Healthcare Realty
HR
$7.42B
$12K ﹤0.01%
+432
New +$12.1K
INTU icon
2781
PUT
Intuit
INTU
$81.1B
$12K ﹤0.01%
28
-4
-13% -$372
KDP icon
2782
CALL
Keurig Dr Pepper
KDP
$40.4B
$12K ﹤0.01%
13
-157
-92% -$12.1K
KIE icon
2783
State Street SPDR S&P Insurance ETF
KIE
$619M
$12K ﹤0.01%
+546
New +$12K
KSS icon
2784
PUT
Kohl's
KSS
$2.03B
$12K ﹤0.01%
282
+279
+9,300% +$19K
LEN icon
2785
Lennar Class A
LEN
$20.4B
$12K ﹤0.01%
+250
New +$11.4K
LHX icon
2786
CALL
L3Harris
LHX
$55.9B
$12K ﹤0.01%
20
-162
-89% -$11.8K
MOMO
2787
Hello Group
MOMO
$869M
$12K ﹤0.01%
+1,169
New +$12.8K
MTG icon
2788
MGIC Investment
MTG
$6.27B
$12K ﹤0.01%
+1,336
New +$12.2K
NAVI icon
2789
Navient
NAVI
$774M
$12K ﹤0.01%
+637
New +$13.1K
NUWE icon
2790
Nuwellis
NUWE
$189K
– –
0
– –
ODP
2791
PUT
DELISTED
ODP
ODP
$12K ﹤0.01%
+34
New +$3.03K
PAA icon
2792
PUT
Plains All American Pipeline
PAA
$17.4B
$12K ﹤0.01%
44
-101
-70% -$5.01K
PBH icon
2793
CALL
Prestige Consumer Healthcare
PBH
$2.35B
$12K ﹤0.01%
+28
New +$1.07K
PBYI icon
2794
CALL
Puma Biotechnology
PBYI
$406M
$12K ﹤0.01%
6
-77
-93% -$16.5K
PIZ icon
2795
PUT
Invesco Dorsey Wright Developed Markets Momentum ETF
PIZ
$718M
$12K ﹤0.01%
46
-35
-43% -$860
PKG icon
2796
PUT
Packaging Corp of America
PKG
$22.7B
$12K ﹤0.01%
69
+3
+5% +$238
PSMT icon
2797
Pricesmart
PSMT
$5.75B
$12K ﹤0.01%
+146
New +$12.1K
RMTI icon
2798
CALL
Rockwell Medical
RMTI
$26.2M
$12K ﹤0.01%
1
– –
RNG icon
2799
CALL
RingCentral
RNG
$4.05B
$12K ﹤0.01%
+61
New +$919
RVTY icon
2800
Revvity
RVTY
$12.3B
$12K ﹤0.01%
+250
New +$11.6K
110 111
112
113 114

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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.