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 | |
|---|---|---|---|---|---|---|
1376
Encompass Health
EHC
$11.2B
| $167K | 0.01% |
+3,682
| New | +$158K |
|
1377
Pediatrix Medical
MD
$2.16B
| $167K | 0.01% |
3,008
-2,744
| -48% | -$150K |
|
|
NEWR
1378
DELISTED
New Relic, Inc.
NEWR
| $167K | 0.01% |
+2,264
| New | +$152K |
|
1379
CALL
EOG Resources
EOG
$78B
| $166K | 0.01% |
838
-8
| -0.9% | -$863 |
|
|
TWO
1380
Two Harbors Investment
TWO
$1.27B
| $166K | 0.01% |
2,709
+1,221
| +82% | +$75K |
|
1381
CALL
Vanguard S&P 500 ETF
VOO
$968B
| $166K | 0.01% |
456
-314
| -41% | -$78.8K |
|
|
CPL
1382
DELISTED
CPFL Energia S.A.
CPL
| $166K | 0.01% |
11,085
+8,037
| +264% | +$110K |
|
1383
PUT
Darden Restaurants
DRI
$22.5B
| $165K | 0.01% |
255
-1
| -0.4% | -$95 |
|
1384
Park Hotels & Resorts
PK
$2.97B
| $165K | 0.01% |
6,126
+3,596
| +142% | +$99.1K |
|
1385
PUT
Vipshop
VIPS
$6.84B
| $165K | 0.01% |
1,354
-838
| -38% | -$13.9K |
|
|
PACW
1386
DELISTED
PacWest Bancorp
PACW
| $165K | 0.01% |
3,336
+2,738
| +458% | +$143K |
|
|
EVHC
1387
PUT
DELISTED
Envision Healthcare Holdings Inc
EVHC
| $165K | 0.01% |
639
+469
| +276% | +$17.5K |
|
1388
CALL
ASML
ASML
$675B
| $164K | 0.01% |
145
+13
| +10% | +$2.56K |
|
1389
PUT
United States Natural Gas Fund
UNG
$470M
| $164K | 0.01% |
289
+274
| +1,827% | +$25.5K |
|
1390
CALL
VeriSign
VRSN
$25.3B
| $164K | 0.01% |
732
+478
| +188% | +$55.4K |
|
1391
Brink's
BCO
$5.02B
| $163K | 0.01% |
+2,292
| New | +$176K |
|
1392
PUT
Carnival Corporation Ltd
CCL
$36.1B
| $163K | 0.01% |
950
-589
| -38% | -$40.1K |
|
1393
Spok Holdings
SPOK
$221M
| $163K | 0.01% |
10,961
+1,769
| +19% | +$26.8K |
|
|
XLNX
1394
CALL
DELISTED
Xilinx Inc
XLNX
| $163K | 0.01% |
493
-532
| -52% | -$38.3K |
|
|
BPL
1395
PUT
DELISTED
Buckeye Partners, L.P.
BPL
| $163K | 0.01% |
103
+10
| +11% | +$486 |
|
1396
PUT
B&G Foods
BGS
$285M
| $162K | 0.01% |
268
-174
| -39% | -$5.32K |
|
1397
Gaming and Leisure Properties
GLPI
$12.8B
| $162K | 0.01% |
4,859
-14,230
| -75% | -$493K |
|
1398
PUT
GoPro
GPRO
$116M
| $162K | 0.01% |
667
-470
| -41% | -$2.69K |
|
1399
Rayonier Advanced Materials
RYAM
$565M
| $162K | 0.01% |
+7,569
| New | +$148K |
|
1400
PUT
Signet Jewelers
SIG
$3.55B
| $162K | 0.01% |
315
-856
| -73% | -$42.5K |
|
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.