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 | |
|---|---|---|---|---|---|---|
3351
PUT
Quanta Services
PWR
$93.1B
| $284K | ﹤0.01% |
70
+59
| +536% | +$2.41K |
|
3352
CALL
ProShares UltraShort Industrials
SIJ
$5.69M
| $284K | ﹤0.01% |
10
-7
| -41% | -$1.31K |
|
|
SPTN
3353
CALL
DELISTED
SpartanNash
SPTN
| $284K | ﹤0.01% |
200
+187
| +1,438% | +$2.47K |
|
|
NS
3354
DELISTED
NuStar Energy L.P.
NS
| $284K | ﹤0.01% |
+11,014
| New | +$307K |
|
|
VNE
3355
PUT
DELISTED
Veoneer, Inc.
VNE
| $284K | ﹤0.01% |
182
+29
| +19% | +$467 |
|
|
QIWI
3356
DELISTED
QIWI PLC
QIWI
| $284K | ﹤0.01% |
14,674
+9,835
| +203% | +$192K |
|
3357
PUT
Cullen/Frost Bankers
CFR
$10.3B
| $283K | ﹤0.01% |
29
-3
| -9% | -$279 |
|
3358
DigitalBridge
DBRG
$2.93B
| $283K | ﹤0.01% |
+14,902
| New | +$307K |
|
|
LITS
3359
CALL
Lite Strategy Inc
LITS
$33.2M
| $283K | ﹤0.01% |
57
-129
| -69% | -$4.8K |
|
3360
PUT
Qualys
QLYS
$4.75B
| $283K | ﹤0.01% |
34
+31
| +1,033% | +$2.57K |
|
3361
Sabesp
SBS
$19.9B
| $283K | ﹤0.01% |
96,989
-102,079
| -51% | -$262K |
|
|
TWO
3362
PUT
Two Harbors Investment
TWO
$1.27B
| $283K | ﹤0.01% |
49
-7
| -13% | -$397 |
|
|
USCR
3363
PUT
DELISTED
U S Concrete, Inc.
USCR
| $283K | ﹤0.01% |
68
-79
| -54% | -$3.62K |
|
|
KA
3364
CALL
DELISTED
Kineta, Inc. Common Stock
KA
| $282K | ﹤0.01% |
+9
| New | +$2.02K |
|
3365
CALL
Armstrong World Industries
AWI
$7.05B
| $281K | ﹤0.01% |
30
-57
| -66% | -$5.44K |
|
3366
Cimpress
CMPR
$2.41B
| $281K | ﹤0.01% |
+2,236
| New | +$291K |
|
3367
CALL
Fossil Group
FOSL
$249M
| $281K | ﹤0.01% |
357
-246
| -41% | -$2.27K |
|
3368
CALL
nVent Electric
NVT
$24.1B
| $281K | ﹤0.01% |
110
+72
| +189% | +$1.67K |
|
3369
Stratasys
SSYS
$700M
| $281K | ﹤0.01% |
13,935
-1,115
| -7% | -$22.2K |
|
3370
Axsome Therapeutics
AXSM
$12.3B
| $280K | ﹤0.01% |
2,713
-24,371
| -90% | -$984K |
|
3371
PUT
Invesco
IVZ
$13.3B
| $280K | ﹤0.01% |
156
-164
| -51% | -$2.8K |
|
3372
Medpace
MEDP
$16.5B
| $280K | ﹤0.01% |
3,341
+2,956
| +768% | +$229K |
|
3373
Stanley Black & Decker
SWK
$14.6B
| $280K | ﹤0.01% |
1,695
-18,673
| -92% | -$2.89M |
|
|
RUTH
3374
CALL
DELISTED
Ruth's Hospitality Group, Inc.
RUTH
| $280K | ﹤0.01% |
129
-415
| -76% | -$9.12K |
|
3375
Lesaka Technologies
LSAK
$392M
| $279K | ﹤0.01% |
75,104
+67,986
| +955% | +$225K |
|
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.