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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
+17.83%
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
$36B
AUM Growth
+$1.89B
Cap. Flow
-$586M
Cap. Flow %
-1.63%
Top 10 Hldgs %
34.84%
Holding
8,479
New
1,472
Increased
3,049
Reduced
2,419
Closed
1,324

Top Buys

Rank Stock Value
1
QQQ icon
Invesco QQQ Trust
QQQ
+$86.9M
2
DIS icon
Walt Disney
DIS
+$25.5M
3
BIDU icon
Baidu
BIDU
+$12.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$12.3M
5
RHT
Red Hat Inc
RHT
+$11.4M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$66M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$60.3M
3
GOOG icon
Alphabet (Google) Class C
GOOG
+$33.9M
4
AAPL icon
Apple
AAPL
+$21.1M
5
XLF icon
State Street Financial Select Sector SPDR ETF
XLF
+$18.2M

Sector Composition

Rank Sector Weight
1 Communication Services 0.58%
2 Technology 0.42%
3 Healthcare 0.34%
4 Consumer Discretionary 0.29%
5 Industrials 0.21%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TPH
7851
CALL
DELISTED
Tri Pointe Homes
TPH
– –
-25
Closed -$27K
TPH
7852
PUT
DELISTED
Tri Pointe Homes
TPH
– –
-20
Closed -$21K
TPVG icon
7853
TriplePoint Venture Growth BDC
TPVG
$179M
– –
-58
Closed -$739
TPVG icon
7854
PUT
TriplePoint Venture Growth BDC
TPVG
$179M
– –
-1
Closed -$1K
TR icon
7855
CALL
Tootsie Roll Industries
TR
$2.85B
– –
-32
Closed -$83K
TR icon
7856
Tootsie Roll Industries
TR
$2.85B
$0 ﹤0.01%
31
-420
-93% -$11.8K
TR icon
7857
PUT
Tootsie Roll Industries
TR
$2.85B
– –
-57
Closed -$150K
TRAK icon
7858
PUT
ReposiTrak
TRAK
$146M
– –
-61
Closed -$36K
TREX icon
7859
Trex
TREX
$4.4B
– –
-3,972
Closed -$139K
TROW icon
7860
T. Rowe Price
TROW
$24.6B
– –
-5,704
Closed -$550K
TRS icon
7861
CALL
TriMas Corp
TRS
$1.44B
– –
-5
Closed -$13K
TRS icon
7862
PUT
TriMas Corp
TRS
$1.44B
– –
-1
Closed -$2K
TRU icon
7863
CALL
TransUnion
TRU
$14.2B
– –
-4
Closed -$22K
TRU icon
7864
TransUnion
TRU
$14.2B
– –
-606
Closed -$37.5K
TRUE
7865
DELISTED
TrueCar
TRUE
– –
-2,599
Closed -$21.7K
TRUP icon
7866
Trupanion
TRUP
$1.03B
– –
-4,962
Closed -$141K
TSE
7867
PUT
DELISTED
Trinseo
TSE
– –
-3
Closed -$13K
TSQ icon
7868
CALL
Townsquare Media
TSQ
$115M
– –
-16
Closed -$6K
TSQ icon
7869
PUT
Townsquare Media
TSQ
$115M
– –
-150
Closed -$61K
TTC icon
7870
Toro Company
TTC
$8.72B
– –
-6,314
Closed -$401K
TTD icon
7871
Trade Desk
TTD
$7.89B
– –
-157,510
Closed -$2.58M
TTEC icon
7872
CALL
TTEC Holdings
TTEC
$96.8M
– –
-9
Closed -$25K
TTI icon
7873
CALL
TETRA Technologies
TTI
$1.26B
– –
-50
Closed -$8K
TTMI icon
7874
TTM Technologies
TTMI
$15B
– –
-2,033
Closed -$19K
TTT icon
7875
ProShares UltraPro Short 20+ Year Treasury
TTT
$18.8M
– –
-1,258
Closed -$129K
313 314
315
316 317

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Simplex Trading's Q1 2019 Portfolio in Review

As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.

Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.

By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.

  • Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
  • Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
  • Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
  • Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
  • Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
  • Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
  • Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.

Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.