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 | |
|---|---|---|---|---|---|---|
2626
RPM International
RPM
$13.7B
| $329K | ﹤0.01% |
5,599
-6,617
| -54% | -$405K |
|
2627
CALL
Genesis Energy
GEL
$1.84B
| $328K | ﹤0.01% |
178
-290
| -62% | -$6.52K |
|
|
NBLX
2628
CALL
DELISTED
Noble Midstream Partners LP
NBLX
| $328K | ﹤0.01% |
114
+28
| +33% | +$991 |
|
2629
PUT
AGNC Investment
AGNC
$12.3B
| $327K | ﹤0.01% |
187
+143
| +325% | +$2.55K |
|
2630
Banco Bilbao Vizcaya Argentaria
BBVA
$144B
| $327K | ﹤0.01% |
61,919
+50,791
| +456% | +$287K |
|
2631
CALL
Iron Mountain
IRM
$38.2B
| $327K | ﹤0.01% |
101
-61
| -38% | -$2K |
|
2632
Main Street Capital
MAIN
$4.97B
| $327K | ﹤0.01% |
9,673
+6,016
| +165% | +$224K |
|
2633
CALL
Reliance Steel & Aluminium
RS
$20.8B
| $327K | ﹤0.01% |
46
-9
| -16% | -$710 |
|
2634
CALL
American Water Works
AWK
$26.3B
| $326K | ﹤0.01% |
36
+27
| +300% | +$2.46K |
|
|
ENT
2635
CALL
DELISTED
Global Eagle Entertainment Inc.
ENT
| $326K | ﹤0.01% |
59
-68
| -54% | -$4.17K |
|
|
LM
2636
CALL
DELISTED
Legg Mason, Inc.
LM
| $326K | ﹤0.01% |
128
+24
| +23% | +$672 |
|
2637
CALL
Ascendis Pharma A/S
ASND
$16.7B
| $325K | ﹤0.01% |
52
-61
| -54% | -$3.83K |
|
2638
DTE Energy
DTE
$31.1B
| $325K | ﹤0.01% |
+3,472
| New | +$339K |
|
|
DVAX
2639
CALL
DELISTED
Dynavax Technologies
DVAX
| $325K | ﹤0.01% |
356
+198
| +125% | +$2.19K |
|
2640
Vicor
VICR
$9.62B
| $325K | ﹤0.01% |
8,619
-21,204
| -71% | -$775K |
|
2641
PUT
Quest Diagnostics
DGX
$25.1B
| $324K | ﹤0.01% |
39
-126
| -76% | -$11.8K |
|
2642
CALL
Element Solutions
ESI
$9.12B
| $324K | ﹤0.01% |
314
-62
| -16% | -$683 |
|
2643
CALL
Rollins
ROL
$18.6B
| $324K | ﹤0.01% |
90
+25
| +38% | +$646 |
|
|
TELL
2644
PUT
DELISTED
Tellurian Inc.
TELL
| $323K | ﹤0.01% |
465
-778
| -63% | -$6.01K |
|
2645
PUT
Conduent
CNDT
$230M
| $322K | ﹤0.01% |
303
+290
| +2,231% | +$4.52K |
|
2646
PUT
Iridium Communications
IRDM
$4.85B
| $322K | ﹤0.01% |
175
-292
| -63% | -$5.99K |
|
2647
CALL
WEX
WEX
$6.11B
| $322K | ﹤0.01% |
23
+20
| +667% | +$3.29K |
|
2648
CALL
NovoCure
NVCR
$2.04B
| $321K | ﹤0.01% |
96
-125
| -57% | -$4.57K |
|
2649
CALL
Antero Resources
AR
$10.9B
| $320K | ﹤0.01% |
341
+85
| +33% | +$1.26K |
|
2650
PUT
Autohome
ATHM
$2.43B
| $320K | ﹤0.01% |
41
-33
| -45% | -$2.49K |
|
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.