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 | |
|---|---|---|---|---|---|---|
326
PUT
Vale
VALE
$63.1B
| $16.1M | 0.03% |
9,276
+2,180
| +31% | +$38.1K |
|
327
CALL
Intuit
INTU
$77B
| $16M | 0.03% |
418
+148
| +55% | +$57K |
|
328
CALL
Southwest Airlines
LUV
$21.9B
| $15.8M | 0.03% |
2,586
-1,234
| -32% | -$65.7K |
|
329
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.06B
| $15.7M | 0.03% |
11,303
-3,205
| -22% | -$98.3K |
|
330
CALL
TJX Companies
TJX
$170B
| $15.7M | 0.03% |
2,369
-512
| -18% | -$34.3K |
|
|
WORK
331
PUT
DELISTED
Slack Technologies, Inc.
WORK
| $15.7M | 0.03% |
3,857
-2,408
| -38% | -$101K |
|
332
CALL
Roblox
RBLX
$34B
| $15.7M | 0.03% |
+2,417
| New | +$168K |
|
333
PUT
Kohl's
KSS
$2.06B
| $15.6M | 0.03% |
2,611
-330
| -11% | -$16.9K |
|
334
PUT
Altria Group
MO
$120B
| $15.4M | 0.03% |
3,013
-456
| -13% | -$20.4K |
|
335
CALL
Tencent Music
TME
$14.3B
| $15.3M | 0.03% |
7,487
+3,697
| +98% | +$93.8K |
|
336
PUT
NextEra Energy
NEE
$187B
| $15.3M | 0.03% |
2,022
-618
| -23% | -$48.2K |
|
337
CALL
Hilton Worldwide
HLT
$72.9B
| $15.2M | 0.03% |
1,256
+294
| +31% | +$34K |
|
338
American Airlines Group
AAL
$8.96B
| $15.1M | 0.03% |
630,880
+607,790
| +2,632% | +$11.7M |
|
339
PUT
Li Auto
LI
$12.3B
| $15.1M | 0.03% |
6,026
-727
| -11% | -$21K |
|
340
CALL
PNC Financial Services
PNC
$99.5B
| $15.1M | 0.03% |
858
+69
| +9% | +$11.4K |
|
341
CALL
Fiverr
FVRR
$370M
| $15M | 0.03% |
691
+305
| +79% | +$74.8K |
|
342
CALL
FuboTV Inc
FUBO
$254M
| $15M | 0.03% |
564
+342
| +154% | +$147K |
|
343
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $14.9M | 0.03% |
+695
| New | +$153K |
|
|
GAP
344
PUT
The Gap Inc
GAP
$6.8B
| $14.8M | 0.03% |
4,986
+327
| +7% | +$8.13K |
|
345
CALL
Fidelity National Information Services
FIS
$20.7B
| $14.8M | 0.03% |
1,053
+454
| +76% | +$62K |
|
346
CALL
Datadog
DDOG
$87B
| $14.8M | 0.03% |
1,771
-485
| -21% | -$46.8K |
|
|
DISCK
347
CALL
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $14.7M | 0.03% |
3,435
+2,935
| +587% | +$124K |
|
348
CALL
Diamondback Energy
FANG
$57.8B
| $14.7M | 0.03% |
1,997
+991
| +99% | +$67.9K |
|
|
COUP
349
PUT
DELISTED
Coupa Software Incorporated
COUP
| $14.6M | 0.03% |
575
-60
| -9% | -$18.9K |
|
350
CALL
eBay
EBAY
$48.5B
| $14.4M | 0.03% |
+2,357
| New | +$137K |
|
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.