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 | |
|---|---|---|---|---|---|---|
376
Sherwin-Williams
SHW
$76.6B
| $1.05M | 0.05% |
+8,061
| New | +$1.1M |
|
377
PUT
General Motors
GM
$73B
| $1.04M | 0.05% |
3,161
-4,870
| -61% | -$198K |
|
378
CALL
Walmart Inc
WMT
$863B
| $1.04M | 0.05% |
16,077
-11,793
| -42% | -$379K |
|
|
MXIM
379
CALL
DELISTED
Maxim Integrated Products
MXIM
| $1.04M | 0.05% |
16,725
+16,130
| +2,711% | +$956K |
|
380
Carter's
CRI
$1.38B
| $1.03M | 0.05% |
9,947
+9,636
| +3,098% | +$1.12M |
|
381
Vanguard Real Estate ETF
VNQ
$39.1B
| $1.03M | 0.05% |
+13,720
| New | +$1.05M |
|
382
Moody's
MCO
$82.5B
| $1.03M | 0.05% |
6,410
+4,458
| +228% | +$722K |
|
383
CALL
XPO
XPO
$25.1B
| $1.03M | 0.05% |
20,231
+18,112
| +855% | +$604K |
|
384
Editas Medicine
EDIT
$419M
| $1.03M | 0.05% |
31,060
+19,175
| +161% | +$683K |
|
385
CALL
C.H. Robinson
CHRW
$24.2B
| $1.02M | 0.05% |
837
-238
| -22% | -$21.9K |
|
386
CALL
Exelixis
EXEL
$14B
| $1.02M | 0.05% |
43,198
+42,226
| +4,344% | +$1.17M |
|
387
State Street SPDR S&P Regional Banking ETF
KRE
$4.82B
| $1.02M | 0.05% |
16,950
-2,041
| -11% | -$127K |
|
388
PUT
Under Armour Class C
UA
$2.81B
| $1.02M | 0.05% |
1,632
-1,109
| -40% | -$15.6K |
|
389
Paycom
PAYC
$6.47B
| $1.02M | 0.04% |
9,516
+4,072
| +75% | +$391K |
|
|
AIMT
390
DELISTED
Aimmune Therapeutics
AIMT
| $1.02M | 0.04% |
32,108
+31,288
| +3,816% | +$1.1M |
|
|
OA
391
DELISTED
Orbital ATK, Inc.
OA
| $1.02M | 0.04% |
7,692
-12,840
| -63% | -$1.69M |
|
392
FerroAtlántica
GSM
$626M
| $1.01M | 0.04% |
94,060
+91,757
| +3,984% | +$1.4M |
|
393
Vanguard FTSE Emerging Markets ETF
VWO
$119B
| $1.01M | 0.04% |
21,494
-940
| -4% | -$45.1K |
|
394
CALL
Electronic Arts
EA
$52.4B
| $1M | 0.04% |
1,656
-564
| -25% | -$68.4K |
|
395
CALL
SPDR Gold Trust
GLD
$130B
| $991K | 0.04% |
7,405
-2,249
| -23% | -$284K |
|
396
Chipotle Mexican Grill
CMG
$41.1B
| $990K | 0.04% |
+153,300
| New | +$966K |
|
|
TWX
397
CALL
DELISTED
Time Warner Inc
TWX
| $988K | 0.04% |
5,208
-2,557
| -33% | -$241K |
|
|
JKS
398
JinkoSolar
JKS
$825M
| $986K | 0.04% |
54,041
+47,662
| +747% | +$972K |
|
|
CELG
399
CALL
DELISTED
Celgene Corp
CELG
| $984K | 0.04% |
6,446
+2,248
| +54% | +$216K |
|
400
PACCAR
PCAR
$68.8B
| $983K | 0.04% |
+22,302
| New | +$1.05M |
|
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.