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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
MCO icon
3226
PUT
Moody's
MCO
$84.2B
$7K ﹤0.01%
156
+109
+232% +$10.5K
MTG icon
3227
CALL
MGIC Investment
MTG
$6.34B
$7K ﹤0.01%
54
+34
+170% +$311
MX icon
3228
Magnachip Semiconductor
MX
$126M
$7K ﹤0.01%
+1,342
New +$12.6K
NVDA icon
3229
CALL
NVIDIA
NVDA
$4.76T
$7K ﹤0.01%
12,400
+8,960
+260% +$4.76K
O icon
3230
CALL
Realty Income
O
$61.1B
$7K ﹤0.01%
121
+112
+1,244% +$5.61K
OMF icon
3231
CALL
OneMain Financial
OMF
$7.08B
$7K ﹤0.01%
31
+21
+210% +$845
PBT
3232
PUT
Permian Basin Royalty Trust
PBT
$1.29B
$7K ﹤0.01%
30
+8
+36% +$76
IMVP
3233
Invesco India ETF
IMVP
$124M
$7K ﹤0.01%
+314
New +$7.08K
PRDO icon
3234
Perdoceo Education
PRDO
$1.99B
$7K ﹤0.01%
1,477
+540
+58% +$3.12K
BCIC
3235
PUT
BCP Investment Corp
BCIC
$88.1M
$7K ﹤0.01%
1
– –
R icon
3236
CALL
Ryder
R
$10.3B
$7K ﹤0.01%
17
-1
-6% -$92
SBAC icon
3237
CALL
SBA Communications
SBAC
$18.3B
$7K ﹤0.01%
14
-22
-61% -$2.6K
SEM
3238
CALL
DELISTED
Select Medical
SEM
$7K ﹤0.01%
+65
New +$486
SFL icon
3239
PUT
SFL Corp
SFL
$1.59B
$7K ﹤0.01%
30
+11
+58% +$163
SIMO icon
3240
PUT
Silicon Motion
SIMO
$8.29B
$7K ﹤0.01%
28
+16
+133% +$437
SNPS icon
3241
Synopsys
SNPS
$74.5B
$7K ﹤0.01%
155
-1,045
-87% -$46.8K
SNX icon
3242
PUT
TD Synnex
SNX
$19.6B
$7K ﹤0.01%
+58
New +$2.23K
SO icon
3243
CALL
Southern Company
SO
$109B
$7K ﹤0.01%
55
-281
-84% -$13.3K
STE icon
3244
PUT
Steris
STE
$21.3B
$7K ﹤0.01%
+40
New +$2.64K
T icon
3245
AT&T
T
$167B
$7K ﹤0.01%
287
-8,087
-97% -$206K
TEX icon
3246
CALL
Terex
TEX
$7.89B
$7K ﹤0.01%
108
-4
-4% -$101
TFC icon
3247
PUT
Truist Financial
TFC
$63.7B
$7K ﹤0.01%
+51
New +$1.92K
TNXP icon
3248
CALL
Tonix Pharmaceuticals
TNXP
$165M
– –
0
– –
TRS icon
3249
CALL
TriMas Corp
TRS
$1.45B
$7K ﹤0.01%
33
+18
+120% +$425
TRX icon
3250
TRX Gold Corp
TRX
$263M
$7K ﹤0.01%
20,000
– –
128 129
130
131 132

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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.