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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
KELYA icon
5251
Kelly Services Class A
KELYA
$526M
– –
-45
Closed -$1K
KEY icon
5252
CALL
KeyCorp
KEY
$24.3B
– –
-112
Closed -$2K
TBHC
5253
CALL
DELISTED
The Brand House Collective
TBHC
– –
-6
Closed -$7K
TBHC
5254
PUT
DELISTED
The Brand House Collective
TBHC
– –
-1
Closed -$1K
KMT icon
5255
Kennametal
KMT
$2.7B
– –
-62
Closed -$2.09K
KMT icon
5256
PUT
Kennametal
KMT
$2.7B
– –
-14
Closed -$3K
KN icon
5257
CALL
Knowles
KN
$3.24B
– –
-16
Closed -$5K
KN icon
5258
PUT
Knowles
KN
$3.24B
– –
-11
Closed -$1K
KOS icon
5259
PUT
Kosmos Energy
KOS
$1.56B
– –
-28
Closed -$5K
KPTI icon
5260
Karyopharm Therapeutics
KPTI
$165M
– –
-36
Closed -$15.5K
KRC icon
5261
Kilroy Realty
KRC
$4.63B
– –
-37
Closed -$3K
KTOS icon
5262
PUT
Kratos Defense & Security Solutions
KTOS
$9B
– –
-33
Closed -$8K
KYN icon
5263
Kayne Anderson Energy Infrastructure Fund
KYN
$2.54B
– –
-785
Closed -$27.8K
KYN icon
5264
PUT
Kayne Anderson Energy Infrastructure Fund
KYN
$2.54B
– –
-12
Closed -$3K
LAB icon
5265
Standard BioTools
LAB
$332M
– –
-447
Closed -$17.7K
LAB icon
5266
PUT
Standard BioTools
LAB
$332M
– –
-37
Closed -$3K
LAZ icon
5267
Lazard
LAZ
$4.36B
– –
-1,165
Closed -$57.4K
LAZ icon
5268
PUT
Lazard
LAZ
$4.36B
– –
-11
Closed -$1K
LBRDA icon
5269
Liberty Broadband Class A
LBRDA
$4.17B
– –
-2,975
Closed -$149K
LBRDK icon
5270
Liberty Broadband Class C
LBRDK
$4.19B
– –
-2,350
Closed -$117K
LEA icon
5271
Lear
LEA
$7.22B
– –
-1,479
Closed -$155K
LEG icon
5272
CALL
Leggett & Platt
LEG
$1.53B
– –
-6
Closed -$2K
LEN icon
5273
CALL
Lennar Class A
LEN
$20.3B
– –
-227
Closed -$64K
LEN icon
5274
PUT
Lennar Class A
LEN
$20.3B
– –
-167
Closed -$16K
LH icon
5275
Labcorp
LH
$24.3B
– –
-5,688
Closed -$585K
209 210
211
212 213

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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.