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 | |
|---|---|---|---|---|---|---|
1426
Telephone and Data Systems
TDS
$3.91B
| $158K | 0.01% |
5,659
+3,986
| +238% | +$108K |
|
1427
ProShares UltraPro Dow 30
UDOW
$849M
| $158K | 0.01% |
7,488
+5,452
| +268% | +$133K |
|
1428
CALL
Alcoa
AA
$11.7B
| $157K | 0.01% |
554
-678
| -55% | -$33.6K |
|
1429
Adtran
ADTN
$798M
| $157K | 0.01% |
10,115
+8,806
| +673% | +$147K |
|
1430
PUT
MBIA
MBI
$288M
| $157K | 0.01% |
2,015
+843
| +72% | +$6.78K |
|
1431
PUT
Ferrari
RACE
$63.3B
| $157K | 0.01% |
352
+39
| +12% | +$4.73K |
|
|
STI
1432
DELISTED
SunTrust Banks, Inc.
STI
| $157K | 0.01% |
+2,309
| New | +$160K |
|
|
GPT
1433
DELISTED
Gramercy Property Trust
GPT
| $157K | 0.01% |
7,248
+7,214
| +21,218% | +$171K |
|
1434
CALL
Flowers Foods
FLO
$1.64B
| $156K | 0.01% |
319
+238
| +294% | +$4.81K |
|
|
B
1435
PUT
Barrick Mining
B
$62.2B
| $156K | 0.01% |
435
-413
| -49% | -$5.49K |
|
1436
CALL
Innoviva
INVA
$1.58B
| $156K | 0.01% |
563
+448
| +390% | +$6.92K |
|
1437
CALL
Occidental Petroleum
OXY
$57B
| $156K | 0.01% |
1,226
+210
| +21% | +$14.7K |
|
|
CNR
1438
Core Natural Resources Inc
CNR
$4.19B
| $156K | 0.01% |
+5,390
| New | +$174K |
|
1439
CALL
Best Buy
BBY
$18B
| $155K | 0.01% |
1,468
+387
| +36% | +$27.8K |
|
1440
CALL
Cboe Global Markets
CBOE
$29.8B
| $155K | 0.01% |
672
-394
| -37% | -$47.9K |
|
1441
Mercury Systems
MRCY
$6.2B
| $155K | 0.01% |
+3,210
| New | +$153K |
|
|
USCR
1442
PUT
DELISTED
U S Concrete, Inc.
USCR
| $155K | 0.01% |
176
+109
| +163% | +$8.09K |
|
1443
CALL
Agilent Technologies
A
$39.1B
| $154K | 0.01% |
470
+183
| +64% | +$12.8K |
|
1444
CALL
American International
AIG
$41.9B
| $154K | 0.01% |
1,494
-1,636
| -52% | -$96.7K |
|
1445
ZTO Express
ZTO
$18.2B
| $154K | 0.01% |
10,320
+3,257
| +46% | +$51.1K |
|
|
CAI
1446
DELISTED
CAI International, Inc.
CAI
| $154K | 0.01% |
7,284
+1,420
| +24% | +$35.3K |
|
1447
CALL
Carvana
CVNA
$43.3B
| $153K | 0.01% |
2,360
+1,800
| +321% | +$7.19K |
|
1448
CALL
First Trust Natural Gas ETF
FCG
$632M
| $153K | 0.01% |
67
-47
| -41% | -$1.02K |
|
1449
CALL
Methanex
MEOH
$4.32B
| $153K | 0.01% |
521
-17
| -3% | -$997 |
|
1450
Sibanye-Stillwater
SBSW
$5.92B
| $153K | 0.01% |
39,956
+28,144
| +238% | +$122K |
|
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.