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 | |
|---|---|---|---|---|---|---|
1326
CALL
Parker-Hannifin
PH
$125B
| $2.39M | 0.01% |
116
-49
| -30% | -$9.49K |
|
1327
eBay
EBAY
$48.6B
| $2.38M | 0.01% |
+65,902
| New | +$2.39M |
|
|
MOMO
1328
CALL
Hello Group
MOMO
$869M
| $2.37M | 0.01% |
708
-432
| -38% | -$15.4K |
|
1329
PUT
Banco Bilbao Vizcaya Argentaria
BBVA
$144B
| $2.37M | 0.01% |
4,240
+3,881
| +1,081% | +$20.7K |
|
1330
PUT
Bunge Global
BG
$23.6B
| $2.37M | 0.01% |
411
+18
| +5% | +$996 |
|
1331
CALL
Cirrus Logic
CRUS
$6.74B
| $2.37M | 0.01% |
287
-59
| -17% | -$4K |
|
|
HZNP
1332
CALL
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $2.36M | 0.01% |
653
+463
| +244% | +$14.2K |
|
1333
PUT
Unum
UNM
$13.8B
| $2.36M | 0.01% |
810
+750
| +1,250% | +$21.8K |
|
|
HDS
1334
CALL
DELISTED
HD Supply Holdings, Inc.
HDS
| $2.36M | 0.01% |
586
-233
| -28% | -$9.27K |
|
1335
CALL
Barclays
BCS
$94.1B
| $2.35M | 0.01% |
2,474
+155
| +7% | +$1.34K |
|
1336
PUT
Sensata Technologies
ST
$6.65B
| $2.35M | 0.01% |
+437
| New | +$22.4K |
|
1337
PUT
Nektar Therapeutics
NKTR
$2.39B
| $2.35M | 0.01% |
73
-25
| -26% | -$7.25K |
|
1338
CALL
Rockwell Automation
ROK
$51.4B
| $2.35M | 0.01% |
116
-14
| -11% | -$2.59K |
|
1339
CALL
Martin Marietta Materials
MLM
$33.6B
| $2.35M | 0.01% |
84
+45
| +115% | +$12K |
|
1340
CALL
Medifast
MED
$108M
| $2.35M | 0.01% |
214
+49
| +30% | +$4.74K |
|
|
1341
PUT
Medifast
MED
$108M
| $2.35M | 0.01% |
214
+18
| +9% | +$1.74K |
|
1342
CALL
Wolfspeed
WOLF
$1.2B
| $2.34M | 0.01% |
508
-185
| -27% | -$8.63K |
|
|
CSII
1343
PUT
DELISTED
Cardiovascular Systems, Inc.
CSII
| $2.34M | 0.01% |
482
+480
| +24,000% | +$21.9K |
|
1344
CALL
Galicia Financial Group
GGAL
$7.92B
| $2.34M | 0.01% |
1,442
+703
| +95% | +$9.29K |
|
1345
CALL
Tapestry
TPR
$28.8B
| $2.34M | 0.01% |
868
-916
| -51% | -$23.9K |
|
1346
Okta
OKTA
$24.1B
| $2.34M | 0.01% |
20,282
+2,637
| +15% | +$304K |
|
1347
CALL
Roper Technologies
ROP
$36.3B
| $2.34M | 0.01% |
66
-71
| -52% | -$24.5K |
|
1348
CALL
AXIS Capital
AXS
$8.59B
| $2.33M | 0.01% |
393
+379
| +2,707% | +$22.9K |
|
1349
PUT
National Grid
NGG
$81.9B
| $2.33M | 0.01% |
421
+274
| +186% | +$14.1K |
|
|
AVLR
1350
CALL
DELISTED
Avalara, Inc.
AVLR
| $2.33M | 0.01% |
318
-767
| -71% | -$55.7K |
|
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.