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 | |
|---|---|---|---|---|---|---|
1526
CALL
Ambarella
AMBA
$2.99B
| $139K | 0.01% |
566
-380
| -40% | -$19.7K |
|
1527
PUT
Elevance Health
ELV
$81.9B
| $139K | 0.01% |
107
-315
| -75% | -$74K |
|
|
GES
1528
CALL
DELISTED
Guess Inc
GES
| $139K | 0.01% |
261
-56
| -18% | -$935 |
|
1529
Natural Resource Partners
NRP
$1.3B
| $139K | 0.01% |
4,871
+4,070
| +508% | +$123K |
|
|
NVEE
1530
DELISTED
NV5 Global
NVEE
| $139K | 0.01% |
+10,044
| New | +$124K |
|
|
SRG
1531
Seritage Growth Properties
SRG
$130M
| $139K | 0.01% |
3,912
-394
| -9% | -$15.3K |
|
|
CZZ
1532
DELISTED
Cosan Limited
CZZ
| $139K | 0.01% |
13,450
+13,358
| +14,520% | +$146K |
|
1533
PUT
Acadia Pharmaceuticals
ACAD
$4.25B
| $138K | 0.01% |
182
-175
| -49% | -$4.84K |
|
1534
PUT
CoStar Group
CSGP
$11.3B
| $138K | 0.01% |
1,100
+1,030
| +1,471% | +$35.5K |
|
1535
Liberty Global Class C
LBTYK
$3.27B
| $138K | 0.01% |
+4,535
| New | +$150K |
|
1536
CALL
O'Reilly Automotive
ORLY
$72.4B
| $138K | 0.01% |
1,680
+480
| +40% | +$8.12K |
|
1537
Ultragenyx Pharmaceutical
RARE
$2.65B
| $137K | 0.01% |
+2,696
| New | +$136K |
|
|
WRD
1538
PUT
DELISTED
WildHorse Resource Development
WRD
| $137K | 0.01% |
838
-88
| -10% | -$1.57K |
|
1539
CALL
APA Corp
APA
$12.8B
| $136K | 0.01% |
1,519
+541
| +55% | +$21.8K |
|
1540
PUT
Cleveland-Cliffs
CLF
$6.81B
| $136K | 0.01% |
758
+215
| +40% | +$1.61K |
|
1541
FormFactor
FORM
$8.11B
| $136K | 0.01% |
+9,968
| New | +$144K |
|
1542
PUT
Nutanix
NTNX
$14.9B
| $136K | 0.01% |
621
-861
| -58% | -$34.2K |
|
1543
Pool Corp
POOL
$6.7B
| $136K | 0.01% |
+931
| New | +$128K |
|
1544
CALL
Regions Financial
RF
$26.3B
| $136K | 0.01% |
1,831
+967
| +112% | +$18.3K |
|
1545
CALL
Vale
VALE
$62.9B
| $136K | 0.01% |
+1,074
| New | +$14.1K |
|
1546
CALL
Viatris
VTRS
$20.1B
| $136K | 0.01% |
932
+347
| +59% | +$14.8K |
|
|
GAP
1547
CALL
The Gap Inc
GAP
$6.84B
| $136K | 0.01% |
455
-918
| -67% | -$30K |
|
|
NLSN
1548
DELISTED
Nielsen Holdings plc
NLSN
| $136K | 0.01% |
4,294
-7,577
| -64% | -$262K |
|
|
LJPC
1549
PUT
DELISTED
La Jolla Pharmaceutical Company
LJPC
| $136K | 0.01% |
570
+306
| +116% | +$9.87K |
|
1550
PUT
Carvana
CVNA
$43.3B
| $135K | 0.01% |
3,125
+1,425
| +84% | +$5.69K |
|
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.