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 | |
|---|---|---|---|---|---|---|
626
PUT
Applied Optoelectronics
AAOI
$8.19B
| $607K | 0.03% |
758
-709
| -48% | -$22.1K |
|
627
NXP Semiconductors
NXPI
$68.1B
| $607K | 0.03% |
+5,195
| New | +$627K |
|
628
PUT
Dollar General
DG
$26B
| $606K | 0.03% |
643
-436
| -40% | -$41.9K |
|
629
MBIA
MBI
$294M
| $606K | 0.03% |
+65,455
| New | +$526K |
|
|
XYZ
630
Block Inc
XYZ
$46.3B
| $606K | 0.03% |
12,337
-246,606
| -95% | -$11.3M |
|
|
S
631
DELISTED
Sprint Corporation
S
| $605K | 0.03% |
124,068
+15,366
| +14% | +$82K |
|
632
Main Street Capital
MAIN
$4.94B
| $604K | 0.03% |
16,375
+15,194
| +1,287% | +$569K |
|
633
PUT
UnitedHealth
UNH
$382B
| $602K | 0.03% |
2,485
+231
| +10% | +$52.8K |
|
634
PUT
Cardinal Health
CAH
$53.3B
| $601K | 0.03% |
791
+82
| +12% | +$5.63K |
|
635
CALL
Zions Bancorporation
ZION
$10.1B
| $601K | 0.03% |
405
+11
| +3% | +$592 |
|
|
CSRA
636
DELISTED
CSRA Inc.
CSRA
| $601K | 0.03% |
14,588
-6,689
| -31% | -$245K |
|
|
SHPG
637
CALL
DELISTED
Shire pic
SHPG
| $601K | 0.03% |
537
+287
| +115% | +$39.5K |
|
638
St. Joe Company
JOE
$3.61B
| $599K | 0.03% |
31,779
+26,661
| +521% | +$494K |
|
|
CAVM
639
DELISTED
Cavium, Inc.
CAVM
| $592K | 0.03% |
+7,462
| New | +$651K |
|
640
iShares MSCI Pacific ex Japan ETF
EPP
$2.18B
| $588K | 0.03% |
12,669
+12,512
| +7,969% | +$602K |
|
641
CALL
Workday
WDAY
$32.9B
| $588K | 0.03% |
429
-195
| -31% | -$23.9K |
|
|
BHVN
642
DELISTED
Biohaven Pharmaceutical Holding Company Ltd.
BHVN
| $588K | 0.03% |
22,855
+20,449
| +850% | +$611K |
|
643
CALL
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $581K | 0.03% |
4,128
+1,850
| +81% | +$85.6K |
|
644
PUT
Blackrock
BLK
$163B
| $580K | 0.03% |
706
+74
| +12% | +$40.6K |
|
645
PUT
Harley-Davidson
HOG
$2.75B
| $580K | 0.03% |
1,109
+759
| +217% | +$36.3K |
|
|
DQ
646
Daqo New Energy
DQ
$787M
| $578K | 0.03% |
59,085
+8,880
| +18% | +$96.2K |
|
647
Ecopetrol
EC
$33.1B
| $577K | 0.03% |
+29,858
| New | +$534K |
|
|
GTLS
648
CALL
DELISTED
Chart Industries
GTLS
| $576K | 0.03% |
503
+168
| +50% | +$9.04K |
|
649
CALL
Tronox
TROX
$1B
| $576K | 0.03% |
30,643
+29,831
| +3,674% | +$594K |
|
|
KL
650
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $576K | 0.03% |
37,303
+14,715
| +65% | +$227K |
|
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.