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 | |
|---|---|---|---|---|---|---|
|
WUBA
426
DELISTED
58.com Inc
WUBA
| $921K | 0.04% |
11,542
-19,788
| -63% | -$1.56M |
|
|
DISH
427
PUT
DELISTED
DISH Network Corp.
DISH
| $915K | 0.04% |
961
-839
| -47% | -$36.9K |
|
428
CRISPR Therapeutics
CRSP
$4.68B
| $914K | 0.04% |
20,015
+17,247
| +623% | +$712K |
|
429
PUT
Biogen
BIIB
$29.6B
| $910K | 0.04% |
864
-762
| -47% | -$237K |
|
|
CLVS
430
DELISTED
Clovis Oncology, Inc.
CLVS
| $902K | 0.04% |
17,102
-25,650
| -60% | -$1.5M |
|
431
PUT
Adobe
ADBE
$84.3B
| $898K | 0.04% |
1,592
+14
| +0.9% | +$2.85K |
|
|
CYBR
432
CALL
DELISTED
CyberArk
CYBR
| $894K | 0.04% |
16,658
+16,498
| +10,311% | +$768K |
|
433
PUT
Honeywell
HON
$78B
| $894K | 0.04% |
1,327
-2,251
| -63% | -$311K |
|
|
DATA
434
DELISTED
Tableau Software, Inc.
DATA
| $891K | 0.04% |
11,027
-14,437
| -57% | -$1.14M |
|
435
PUT
American Express
AXP
$233B
| $888K | 0.04% |
1,621
+252
| +18% | +$24.4K |
|
436
CALL
3M
MMM
$87.5B
| $887K | 0.04% |
1,615
+491
| +44% | +$97.3K |
|
|
X
437
CALL
DELISTED
US Steel
X
| $886K | 0.04% |
4,494
+1,178
| +36% | +$46.4K |
|
|
DISH
438
DELISTED
DISH Network Corp.
DISH
| $885K | 0.04% |
23,375
-3,863
| -14% | -$170K |
|
439
PUT
MetLife
MET
$59.5B
| $878K | 0.04% |
3,658
+1,589
| +77% | +$77.1K |
|
440
PUT
Procter & Gamble
PG
$342B
| $878K | 0.04% |
2,623
-2,850
| -52% | -$238K |
|
|
MZOR
441
DELISTED
Mazor Robotics Ltd.
MZOR
| $878K | 0.04% |
14,313
+8,255
| +136% | +$518K |
|
442
Energy Transfer Partners
ET
$70.3B
| $872K | 0.04% |
+61,379
| New | +$1.02M |
|
443
Xerox
XRX
$341M
| $869K | 0.04% |
30,203
+15,507
| +106% | +$477K |
|
|
LLL
444
DELISTED
L3 Technologies, Inc.
LLL
| $868K | 0.04% |
+4,177
| New | +$866K |
|
|
JNPR
445
DELISTED
Juniper Networks
JNPR
| $865K | 0.04% |
+35,580
| New | +$946K |
|
|
MLNX
446
CALL
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $864K | 0.04% |
10,149
+9,751
| +2,450% | +$656K |
|
|
BPL
447
DELISTED
Buckeye Partners, L.P.
BPL
| $863K | 0.04% |
23,092
+8,016
| +53% | +$389K |
|
|
SHLX
448
DELISTED
Shell Midstream Partners, L.P.
SHLX
| $861K | 0.04% |
40,918
-1,987
| -5% | -$52.4K |
|
|
ABMD
449
CALL
DELISTED
Abiomed Inc
ABMD
| $858K | 0.04% |
2,859
+2,826
| +8,564% | +$716K |
|
450
CALL
Avis
CAR
$5.62B
| $857K | 0.04% |
771
-289
| -27% | -$13K |
|
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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.