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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1426
CALL
Zebra Technologies
ZBRA
$12.4B
| $1.29M | ﹤0.01% |
81
+63
| +350% | +$10.5K |
|
|
ITCI
1427
CALL
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $1.29M | ﹤0.01% |
1,132
+841
| +289% | +$13.6K |
|
1428
CALL
Vistra
VST
$55.1B
| $1.29M | ﹤0.01% |
563
+364
| +183% | +$8.58K |
|
1429
Liberty Global Class A
LBTYA
$3.28B
| $1.29M | ﹤0.01% |
60,344
+51,886
| +613% | +$1.27M |
|
1430
Aramark
ARMK
$15B
| $1.29M | ﹤0.01% |
61,504
+41,428
| +206% | +$1.08M |
|
1431
CALL
Stryker
SYK
$127B
| $1.28M | ﹤0.01% |
82
-75
| -48% | -$12.5K |
|
1432
CALL
AllianceBernstein
AB
$3.47B
| $1.28M | ﹤0.01% |
470
+430
| +1,075% | +$12.4K |
|
|
ARRS
1433
PUT
DELISTED
ARRIS International plc Ordinary Shares
ARRS
| $1.28M | ﹤0.01% |
420
+416
| +10,400% | +$11.6K |
|
|
LM
1434
DELISTED
Legg Mason, Inc.
LM
| $1.28M | ﹤0.01% |
50,219
+49,889
| +15,118% | +$1.4M |
|
1435
CALL
Kornit Digital
KRNT
$706M
| $1.28M | ﹤0.01% |
684
+615
| +891% | +$12K |
|
|
SNV
1436
DELISTED
Synovus
SNV
| $1.28M | ﹤0.01% |
39,986
+34,544
| +635% | +$1.3M |
|
|
ARRS
1437
CALL
DELISTED
ARRIS International plc Ordinary Shares
ARRS
| $1.27M | ﹤0.01% |
417
+170
| +69% | +$4.72K |
|
1438
Marathon Petroleum
MPC
$90.3B
| $1.27M | ﹤0.01% |
21,562
-145,242
| -87% | -$9.91M |
|
1439
CALL
Shake Shack
SHAK
$2.3B
| $1.27M | ﹤0.01% |
280
-6
| -2% | -$309 |
|
1440
CALL
Franco-Nevada
FNV
$41.4B
| $1.27M | ﹤0.01% |
181
-105
| -37% | -$7.02K |
|
1441
CALL
Pinduoduo
PDD
$118B
| $1.27M | ﹤0.01% |
566
+449
| +384% | +$9.47K |
|
|
SGI
1442
CALL
Somnigroup International
SGI
$15.1B
| $1.27M | ﹤0.01% |
1,228
+320
| +35% | +$3.83K |
|
1443
Ambarella
AMBA
$2.99B
| $1.27M | ﹤0.01% |
36,266
+11,666
| +47% | +$413K |
|
1444
ProShares UltraShort Bloomberg Crude Oil
SCO
$585M
| $1.27M | ﹤0.01% |
541
+128
| +31% | +$213K |
|
1445
Dollar Tree
DLTR
$23.1B
| $1.27M | ﹤0.01% |
14,019
-37,157
| -73% | -$3.14M |
|
1446
PUT
VanEck Durable High Dividend ETF
DURA
$38.7M
| $1.27M | ﹤0.01% |
+384
| New | +$9.8K |
|
1447
PTC
PTC
$13.7B
| $1.26M | ﹤0.01% |
+15,243
| New | +$1.34M |
|
1448
CALL
Knight Transportation
KNX
$11.8B
| $1.26M | ﹤0.01% |
503
+326
| +184% | +$10.1K |
|
|
HTZ
1449
PUT
DELISTED
Hertz Global Holdings, Inc.
HTZ
| $1.26M | ﹤0.01% |
1,062
-816
| -43% | -$11.5K |
|
1450
PUT
Box
BOX
$4.02B
| $1.26M | ﹤0.01% |
745
+233
| +46% | +$4.29K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.