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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
AST
2776
DELISTED
Asterias Biotherapeutics Inc. Series A
AST
| $36K | ﹤0.01% |
25,038
+3,142
| +14% | +$6.56K |
|
2777
Arbutus Biopharma
ABUS
$875M
| $35K | ﹤0.01% |
7,031
+4,238
| +152% | +$22.4K |
|
2778
PUT
Arch Capital
ACGL
$37.2B
| $35K | ﹤0.01% |
+762
| New | +$22.4K |
|
2779
PUT
ASML
ASML
$608B
| $35K | ﹤0.01% |
191
-176
| -48% | -$34.7K |
|
2780
PUT
Buckle
BKE
$2.32B
| $35K | ﹤0.01% |
257
+31
| +14% | +$651 |
|
2781
PUT
Century Communities
CCS
$2.09B
| $35K | ﹤0.01% |
178
| – | – |
|
2782
CALL
Chegg
CHGG
$118M
| $35K | ﹤0.01% |
89
-119
| -57% | -$2.25K |
|
2783
Collegium Pharmaceutical
COLL
$1.16B
| $35K | ﹤0.01% |
1,397
-2,215
| -61% | -$52.8K |
|
2784
Entergy
ETR
$53.1B
| $35K | ﹤0.01% |
+900
| New | +$34.8K |
|
2785
Fidelity National Financial
FNF
$14.4B
| $35K | ﹤0.01% |
933
-6,533
| -88% | -$249K |
|
|
GOOD
2786
Gladstone Commercial Corp
GOOD
$629M
| $35K | ﹤0.01% |
+2,062
| New | +$37.9K |
|
2787
PUT
Genuine Parts
GPC
$17.9B
| $35K | ﹤0.01% |
139
-19
| -12% | -$1.84K |
|
2788
iShares Europe ETF
IEV
$1.65B
| $35K | ﹤0.01% |
+769
| New | +$36.8K |
|
2789
PUT
Lesaka Technologies
LSAK
$395M
| $35K | ﹤0.01% |
539
-128
| -19% | -$1.4K |
|
2790
CALL
Mohawk Industries
MHK
$7.16B
| $35K | ﹤0.01% |
75
-110
| -59% | -$28.3K |
|
2791
CALL
Pitney Bowes
PBI
$2.44B
| $35K | ﹤0.01% |
244
-10
| -4% | -$124 |
|
2792
Pentair
PNR
$10.6B
| $35K | ﹤0.01% |
+773
| New | +$36.8K |
|
2793
Primoris Services
PRIM
$4.38B
| $35K | ﹤0.01% |
+1,403
| New | +$36K |
|
2794
ProShares Ultra Health Care
RXL
$89M
| $35K | ﹤0.01% |
+1,664
| New | +$38.7K |
|
2795
CALL
Sprouts Farmers Market
SFM
$7.3B
| $35K | ﹤0.01% |
967
+762
| +372% | +$19.5K |
|
2796
CALL
Sempra
SRE
$59.7B
| $35K | ﹤0.01% |
400
-414
| -51% | -$22.3K |
|
2797
CALL
Toronto Dominion Bank
TD
$199B
| $35K | ﹤0.01% |
419
+193
| +85% | +$11.3K |
|
2798
PUT
Wolfspeed
WOLF
$1.12B
| $35K | ﹤0.01% |
420
-48
| -10% | -$1.81K |
|
|
YRD
2799
PUT
Yiren Digital
YRD
$101M
| $35K | ﹤0.01% |
104
-353
| -77% | -$14.2K |
|
|
VIVS
2800
PUT
VivoSim Labs
VIVS
$1.29M
| $35K | ﹤0.01% |
+1
| New | +$292 |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.