Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
SPHS
2826
PUT
DELISTED
Sophiris Bio, Inc.
SPHS
| $29K | ﹤0.01% |
439
+160
| +57% | +$332 |
|
|
LPNT
2827
DELISTED
LifePoint Health, Inc.
LPNT
| $29K | ﹤0.01% |
+504
| New | +$30K |
|
2828
PUT
Autohome
ATHM
$2.43B
| $28K | ﹤0.01% |
65
+43
| +195% | +$2.46K |
|
2829
PUT
ATI
ATI
$27B
| $28K | ﹤0.01% |
278
+74
| +36% | +$1.46K |
|
2830
PUT
AvalonBay Communities
AVB
$27.1B
| $28K | ﹤0.01% |
111
-3
| -3% | -$562 |
|
|
AXON
2831
CALL
Axon Enterprise
AXON
$40.5B
| $28K | ﹤0.01% |
247
-133
| -35% | -$3.11K |
|
2832
CALL
B&G Foods
BGS
$285M
| $28K | ﹤0.01% |
171
+127
| +289% | +$4.17K |
|
2833
CALL
Box
BOX
$4.02B
| $28K | ﹤0.01% |
162
+76
| +88% | +$1.43K |
|
2834
Bruker
BRKR
$9.2B
| $28K | ﹤0.01% |
+963
| New | +$27.7K |
|
2835
PUT
Citizens Financial Group
CFG
$30.4B
| $28K | ﹤0.01% |
778
-16
| -2% | -$560 |
|
2836
PUT
GoDaddy
GDDY
$12.3B
| $28K | ﹤0.01% |
+289
| New | +$12.5K |
|
2837
Groupon
GRPN
$980M
| $28K | ﹤0.01% |
270
-1,839
| -87% | -$152K |
|
2838
CALL
Hudbay
HBM
$9.92B
| $28K | ﹤0.01% |
+549
| New | +$4.13K |
|
2839
CALL
Kosmos Energy
KOS
$1.56B
| $28K | ﹤0.01% |
+304
| New | +$2.1K |
|
2840
Standard BioTools
LAB
$326M
| $28K | ﹤0.01% |
5,561
-842
| -13% | -$3.54K |
|
2841
Martin Midstream Partners
MMLP
$95.9M
| $28K | ﹤0.01% |
+1,819
| New | +$32.1K |
|
2842
CALL
Nektar Therapeutics
NKTR
$2.39B
| $28K | ﹤0.01% |
9
-17
| -65% | -$5.32K |
|
2843
CALL
Oaktree Specialty Lending
OCSL
$1.03B
| $28K | ﹤0.01% |
226
+172
| +319% | +$2.75K |
|
|
PRA
2844
DELISTED
ProAssurance
PRA
| $28K | ﹤0.01% |
524
+481
| +1,119% | +$27.2K |
|
2845
Radian Group
RDN
$5.14B
| $28K | ﹤0.01% |
+1,499
| New | +$26K |
|
2846
CALL
Rollins
ROL
$18.6B
| $28K | ﹤0.01% |
+230
| New | +$4.44K |
|
|
SEE
2847
PUT
DELISTED
Sealed Air
SEE
| $28K | ﹤0.01% |
127
+4
| +3% | +$177 |
|
|
SEM
2848
PUT
DELISTED
Select Medical
SEM
| $28K | ﹤0.01% |
+176
| New | +$1.63K |
|
2849
CALL
Tapestry
TPR
$28.8B
| $28K | ﹤0.01% |
443
-119
| -21% | -$5.24K |
|
2850
TTEC Holdings
TTEC
$103M
| $28K | ﹤0.01% |
688
-2,867
| -81% | -$116K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.