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 | |
|---|---|---|---|---|---|---|
301
CALL
iShares MSCI Global Gold Miners ETF
RING
$2.37B
| $1.29M | 0.06% |
46,182
+44,819
| +3,288% | +$818K |
|
302
Teleflex
TFX
$5.98B
| $1.29M | 0.06% |
5,075
+5,072
| +169,067% | +$1.33M |
|
303
Rio Tinto
RIO
$150B
| $1.29M | 0.06% |
25,011
+8,699
| +53% | +$474K |
|
304
Sarepta Therapeutics
SRPT
$1.7B
| $1.29M | 0.06% |
17,379
-820
| -5% | -$54.7K |
|
305
CALL
Mastercard
MA
$474B
| $1.28M | 0.06% |
1,660
+27
| +2% | +$4.62K |
|
|
EVHC
306
DELISTED
Envision Healthcare Holdings Inc
EVHC
| $1.28M | 0.06% |
33,229
+3,097
| +10% | +$116K |
|
307
VanEck Oil Services ETF
OIH
$2.04B
| $1.27M | 0.06% |
2,672
+2,143
| +405% | +$1.11M |
|
|
MNK
308
PUT
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $1.27M | 0.06% |
1,891
+366
| +24% | +$6.6K |
|
309
PUT
Amgen
AMGN
$198B
| $1.27M | 0.06% |
1,314
-1,119
| -46% | -$205K |
|
|
USCR
310
DELISTED
U S Concrete, Inc.
USCR
| $1.27M | 0.06% |
+21,035
| New | +$1.56M |
|
311
DaVita
DVA
$15.1B
| $1.27M | 0.06% |
19,258
+6,393
| +50% | +$470K |
|
312
Teck Resources
TECK
$28B
| $1.26M | 0.06% |
+49,041
| New | +$1.38M |
|
313
APA Corp
APA
$12.7B
| $1.26M | 0.06% |
32,763
+24,089
| +278% | +$969K |
|
314
CALL
Travel + Leisure Co
TNL
$4.7B
| $1.25M | 0.06% |
24,090
+23,795
| +8,066% | +$1.27M |
|
|
MDP
315
DELISTED
Meredith Corporation
MDP
| $1.25M | 0.05% |
23,163
+14,484
| +167% | +$860K |
|
316
Clorox
CLX
$11.7B
| $1.24M | 0.05% |
+9,289
| New | +$1.25M |
|
317
PUT
Expedia Group
EXPE
$31.8B
| $1.24M | 0.05% |
2,345
+957
| +69% | +$111K |
|
|
KYNB
318
Kyntra Bio
KYNB
$29M
| $1.23M | 0.05% |
1,065
+579
| +119% | +$762K |
|
|
TWX
319
PUT
DELISTED
Time Warner Inc
TWX
| $1.22M | 0.05% |
5,228
-3,872
| -43% | -$365K |
|
320
PUT
CVS Health
CVS
$140B
| $1.22M | 0.05% |
1,893
-1,086
| -36% | -$77.9K |
|
321
Transocean
RIG
$5.84B
| $1.22M | 0.05% |
122,843
+89,910
| +273% | +$926K |
|
322
TripAdvisor
TRIP
$1.61B
| $1.21M | 0.05% |
29,588
+10,224
| +53% | +$400K |
|
323
DexCom
DXCM
$27.9B
| $1.21M | 0.05% |
+65,160
| New | +$964K |
|
324
CALL
NXP Semiconductors
NXPI
$70.1B
| $1.2M | 0.05% |
879
-534
| -38% | -$64.4K |
|
325
CALL
Target
TGT
$62.7B
| $1.2M | 0.05% |
3,722
-583
| -14% | -$42.4K |
|
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.