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
|
+$67.5M |
| 2 |
Palantir
PLTR
|
+$64.7M |
| 3 |
PARA
Paramount Global Class B
PARA
|
+$31.5M |
| 4 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$30.7M |
| 5 |
Carnival Corporation Ltd
CCL
|
+$25.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
Tesla
TSLA
|
+$53.7M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$38.1M |
| 4 |
Invesco QQQ Trust
QQQ
|
+$37.6M |
| 5 |
AutoZone
AZO
|
+$28.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.65% |
| 2 | Consumer Discretionary | 0.49% |
| 3 | Healthcare | 0.32% |
| 4 | Financials | 0.3% |
| 5 | Industrials | 0.29% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1251
PUT
Shenandoah Telecom
SHEN
$632M
| $2.88M | 0.01% |
+591
| New | +$27.1K |
|
1252
PUT
Shift4
FOUR
$3.84B
| $2.88M | 0.01% |
351
-202
| -37% | -$15.7K |
|
|
FLNA
1253
CALL
Filana Therapeutics
FLNA
$43M
| $2.88M | 0.01% |
+640
| New | +$25.2K |
|
1254
PUT
Unilever
UL
$131B
| $2.88M | 0.01% |
+458
| New | +$29.2K |
|
1255
CALL
Coty
COTY
$2.33B
| $2.87M | 0.01% |
3,186
-76
| -2% | -$580 |
|
1256
Stellantis
STLA
$16.5B
| $2.86M | 0.01% |
160,602
+144,391
| +891% | +$2.43M |
|
1257
CALL
Harley-Davidson
HOG
$2.68B
| $2.85M | 0.01% |
+712
| New | +$26.5K |
|
1258
PUT
Universal Health Services
UHS
$9.43B
| $2.85M | 0.01% |
214
+101
| +89% | +$13.4K |
|
|
RUTH
1259
PUT
DELISTED
Ruth's Hospitality Group, Inc.
RUTH
| $2.85M | 0.01% |
1,149
-507
| -31% | -$10.8K |
|
1260
CALL
ACI Worldwide
ACIW
$5.72B
| $2.85M | 0.01% |
749
+228
| +44% | +$8.99K |
|
1261
CALL
Corteva
CTVA
$59.7B
| $2.85M | 0.01% |
611
-526
| -46% | -$23.3K |
|
1262
Direxion Daily S&P Biotech Bull 3X ETF
LABU
$571M
| $2.85M | 0.01% |
1,805
+1,046
| +138% | +$2.45M |
|
|
FSR
1263
PUT
DELISTED
Fisker Inc.
FSR
| $2.85M | 0.01% |
1,653
-105
| -6% | -$1.92K |
|
1264
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $2.84M | 0.01% |
327
-109
| -25% | -$9.92K |
|
1265
PUT
Weyerhaeuser
WY
$17.3B
| $2.84M | 0.01% |
799
-307
| -28% | -$10.5K |
|
|
CMA
1266
PUT
DELISTED
Comerica
CMA
| $2.84M | 0.01% |
396
-331
| -46% | -$21.7K |
|
1267
CALL
BioNTech
BNTX
$22.6B
| $2.84M | 0.01% |
260
-189
| -42% | -$20.1K |
|
1268
PUT
Bunge Global
BG
$23.6B
| $2.84M | 0.01% |
358
-4
| -1% | -$297 |
|
1269
PUT
Pembina Pipeline
PBA
$29.9B
| $2.82M | 0.01% |
979
+788
| +413% | +$21.9K |
|
|
AXON
1270
CALL
Axon Enterprise
AXON
$40.5B
| $2.82M | 0.01% |
198
-130
| -40% | -$20.3K |
|
1271
PUT
Evercore
EVR
$13.1B
| $2.82M | 0.01% |
214
+208
| +3,467% | +$25.4K |
|
1272
Direxion Daily 20+ Year Treasury Bear 3X ETF
TMV
$180M
| $2.81M | 0.01% |
138,240
+132,688
| +2,390% | +$2.29M |
|
1273
PUT
Antero Resources
AR
$10.9B
| $2.81M | 0.01% |
2,758
-635
| -19% | -$5.38K |
|
|
SIVB
1274
CALL
DELISTED
SVB Financial Group
SIVB
| $2.81M | 0.01% |
57
+3
| +6% | +$1.48K |
|
1275
CALL
First Trust Consumer Discretionary AlphaDEX Fund
FXD
$263M
| $2.81M | 0.01% |
350
-254
| -42% | -$14.3K |
|
Similar funds
Simplex Trading's Q1 2021 Portfolio in Review
As of Q1 2021, Simplex Trading held 10,706 positions worth $55.7B, down 28% from $77.2B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading withdrew a net $23.5B in Q1 2021, closing 1,706 positions and reducing 3,151 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $38.1M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.65% of assets, up from 0.37% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Pfizer worth $16.8M.
- Simplex Trading's largest Q1 2021 buy was Pfizer: 464,628 shares worth $16.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q1 2021, an estimated $67.5M increase.
- Simplex Trading's biggest Q1 2021 reduction was Amazon, cutting an estimated $66M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2021, selling an estimated $38.1M.
- Simplex Trading's ten largest holdings make up 43% of its $55.7B portfolio in Q1 2021.
- Simplex Trading opened 2,258 new positions and closed 1,706 in Q1 2021.
- Simplex Trading's portfolio value fell 28% quarter-over-quarter to $55.7B.
Based on Simplex Trading's 13F filing for Q1 2021, filed 26 Apr 2021.