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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
+4.52%
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
$2.3B
AUM Growth
-$8.99M
Cap. Flow
-$114M
Cap. Flow %
-4.94%
Top 10 Hldgs %
22.88%
Holding
7,527
New
1,408
Increased
2,202
Reduced
2,320
Closed
1,474

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$83.1M
2
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$37.2M
3
AMGN icon
Amgen
AMGN
+$30.5M
4
MU icon
Micron Technology
MU
+$28.8M
5
QCOM icon
Qualcomm
QCOM
+$18.2M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$29.5M
2
GS icon
Goldman Sachs
GS
+$27.8M
3
GILD icon
Gilead Sciences
GILD
+$27.6M
4
BKNG icon
Booking.com
BKNG
+$25.4M
5
T icon
AT&T
T
+$19.6M

Sector Composition

Rank Sector Weight
1 Technology 13.55%
2 Communication Services 11.57%
3 Consumer Discretionary 9.69%
4 Healthcare 7.28%
5 Financials 4.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SRI icon
5726
Stoneridge
SRI
$209M
$1K ﹤0.01%
112
-3
-3% -$50
STKL
5727
PUT
DELISTED
SunOpta
STKL
$1K ﹤0.01%
+40
New +$334
STNG icon
5728
CALL
Scorpio Tankers
STNG
$3.96B
$1K ﹤0.01%
20
-3
-13% -$121
STWD icon
5729
PUT
Starwood Property Trust
STWD
$6.12B
$1K ﹤0.01%
+146
New +$3.26K
SUP
5730
PUT
DELISTED
Superior Industries International
SUP
$1K ﹤0.01%
+9
New +$187
TCBI icon
5731
CALL
Texas Capital Bancshares
TCBI
$4.31B
$1K ﹤0.01%
8
-180
-96% -$13.9K
TCPC icon
5732
CALL
BlackRock TCP Capital
TCPC
$265M
$1K ﹤0.01%
55
-40
-42% -$680
TDW icon
5733
CALL
Tidewater
TDW
$3.91B
$1K ﹤0.01%
+2
New +$54
TEO icon
5734
PUT
Telecom Argentina
TEO
$5.89B
$1K ﹤0.01%
+63
New +$1.52K
THRM icon
5735
PUT
Gentherm
THRM
$1.31B
$1K ﹤0.01%
+11
New +$411
TLYS icon
5736
CALL
Tilly's
TLYS
$115M
$1K ﹤0.01%
+22
New +$209
TLYS icon
5737
PUT
Tilly's
TLYS
$115M
$1K ﹤0.01%
+20
New +$190
TNK icon
5738
CALL
Teekay Tankers
TNK
$2.63B
$1K ﹤0.01%
46
+11
+31% +$170
TOUR
5739
PUT
Tuniu
TOUR
$55.4M
$1K ﹤0.01%
3
-57
-95% -$4.68K
TPST icon
5740
PUT
Tempest Therapeutics
TPST
$14.8M
– –
0
– –
TRAK icon
5741
PUT
ReposiTrak
TRAK
$148M
$1K ﹤0.01%
6
-66
-92% -$812
TRMB icon
5742
PUT
Trimble
TRMB
$12.3B
$1K ﹤0.01%
83
-1
-1% -$35
TRUE
5743
CALL
DELISTED
TrueCar
TRUE
$1K ﹤0.01%
6
-181
-97% -$3.12K
TSE
5744
PUT
DELISTED
Trinseo
TSE
$1K ﹤0.01%
77
-67
-47% -$4.38K
TTGT icon
5745
CALL
TechTarget
TTGT
$246M
$1K ﹤0.01%
+2
New +$19
TTNP
5746
DELISTED
Titan Pharmaceuticals
TTNP
– –
0
– –
TX icon
5747
PUT
Ternium
TX
$9.29B
$1K ﹤0.01%
287
+57
+25% +$1.46K
TXMD icon
5748
PUT
TherapeuticsMD
TXMD
$23.8M
– –
0
– –
TZOO icon
5749
CALL
Travelzoo
TZOO
$103M
$1K ﹤0.01%
+11
New +$110
UDR icon
5750
PUT
UDR
UDR
$12.9B
$1K ﹤0.01%
10
– –
228 229
230
231 232

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Simplex Trading's Q2 2017 Portfolio in Review

As of Q2 2017, Simplex Trading held 7,527 positions worth $2.3B, down 0.39% from $2.31B the previous quarter. Its ten largest holdings account for 23% of the portfolio.

Simplex Trading withdrew a net $114M in Q2 2017, closing 1,474 positions and reducing 2,320 holdings. Its most notable exit was AT&T, an estimated $19.6M position sold in full.

By sector, the portfolio is most concentrated in Technology at 14% of assets, up from 9.7% a quarter earlier, followed by Communication Services and Consumer Discretionary.

Against the trend, Simplex Trading opened a new position in Amgen worth $32.3M.

  • Simplex Trading's largest Q2 2017 buy was Amgen: 187,633 shares worth $32.3M.
  • Simplex Trading added most to Amazon in Q2 2017, an estimated $83.1M increase.
  • Simplex Trading's biggest Q2 2017 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $29.5M.
  • Simplex Trading fully exited AT&T in Q2 2017, selling an estimated $19.6M.
  • Simplex Trading's ten largest holdings make up 23% of its $2.3B portfolio in Q2 2017.
  • Simplex Trading opened 1,408 new positions and closed 1,474 in Q2 2017.
  • Simplex Trading's portfolio value fell 0.39% quarter-over-quarter to $2.3B.

Based on Simplex Trading's 13F filing for Q2 2017, filed 12 Jul 2017.