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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3726
PUT
Aegon
AEG
$13.6B
| $205K | ﹤0.01% |
491
+11
| +2% | +$45 |
|
3727
CALL
VanEck Durable High Dividend ETF
DURA
$39.3M
| $205K | ﹤0.01% |
60
-336
| -85% | -$9.69K |
|
3728
CALL
Highwoods Properties
HIW
$3.71B
| $205K | ﹤0.01% |
+42
| New | +$1.94K |
|
3729
CALL
Leidos
LDOS
$14.9B
| $205K | ﹤0.01% |
21
-42
| -67% | -$3.7K |
|
|
WNS
3730
PUT
DELISTED
WNS Holdings
WNS
| $205K | ﹤0.01% |
+31
| New | +$1.93K |
|
3731
CALL
Cabot Corp
CBT
$4.7B
| $204K | ﹤0.01% |
43
+35
| +438% | +$1.62K |
|
3732
PUT
CenterPoint Energy
CNP
$28.8B
| $204K | ﹤0.01% |
75
+59
| +369% | +$1.6K |
|
|
DVAX
3733
CALL
DELISTED
Dynavax Technologies
DVAX
| $204K | ﹤0.01% |
358
-397
| -53% | -$2.12K |
|
|
ACH
3734
CALL
Accendra Health
ACH
$249M
| $204K | ﹤0.01% |
395
+377
| +2,094% | +$2.42K |
|
|
TPC
3735
PUT
Tutor Perini Cor
TPC
$4.31B
| $204K | ﹤0.01% |
159
+157
| +7,850% | +$2.42K |
|
|
GLOG
3736
DELISTED
GASLOG LTD
GLOG
| $204K | ﹤0.01% |
20,881
+12,860
| +160% | +$146K |
|
3737
CALL
Ardelyx
ARDX
$1.25B
| $203K | ﹤0.01% |
271
+123
| +83% | +$747 |
|
3738
Cullen/Frost Bankers
CFR
$10.5B
| $203K | ﹤0.01% |
+2,085
| New | +$194K |
|
3739
CALL
Comstock Resources
CRK
$3.64B
| $203K | ﹤0.01% |
247
-59
| -19% | -$412 |
|
3740
PUT
Halozyme
HALO
$9.9B
| $203K | ﹤0.01% |
115
+64
| +125% | +$1.11K |
|
3741
CALL
Integra LifeSciences
IART
$1.54B
| $203K | ﹤0.01% |
35
-46
| -57% | -$2.74K |
|
3742
CALL
Minerva Neurosciences
NERV
$199M
| $203K | ﹤0.01% |
36
+17
| +89% | +$750 |
|
3743
CALL
Revvity
RVTY
$12.4B
| $203K | ﹤0.01% |
21
-63
| -75% | -$5.62K |
|
|
SFBS
3744
CALL
ServisFirst Bancshares
SFBS
$4.92B
| $203K | ﹤0.01% |
+54
| New | +$1.93K |
|
3745
PUT
Sasol
SSL
$7.03B
| $203K | ﹤0.01% |
94
+57
| +154% | +$1.09K |
|
3746
CALL
Open Text
OTEX
$6.02B
| $202K | ﹤0.01% |
46
+28
| +156% | +$1.18K |
|
3747
PUT
Precigen
PGEN
$1.97B
| $202K | ﹤0.01% |
369
-369
| -50% | -$2.08K |
|
|
AXE
3748
PUT
DELISTED
Anixter International Inc
AXE
| $202K | ﹤0.01% |
22
+15
| +214% | +$1.22K |
|
3749
PUT
Cathay General Bancorp
CATY
$4.25B
| $201K | ﹤0.01% |
53
-5
| -9% | -$183 |
|
|
UCTT
3750
CALL
Ultra Clean Holdings
UCTT
$3.47B
| $201K | ﹤0.01% |
86
-65
| -43% | -$1.31K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.