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 | Miscellaneous | 97.22% |
| 2 | Technology | 0.66% |
| 3 | Consumer Discretionary | 0.49% |
| 4 | Healthcare | 0.33% |
| 5 | Financials | 0.3% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
Pinduoduo
PDD
$117B
| $18.3M | 0.03% |
136,673
+128,860
| +1,649% | +$21.8M |
|
302
PUT
MGM Resorts International
MGM
$10.4B
| $18.2M | 0.03% |
+4,780
| New | +$167K |
|
303
PUT
Tilray
TLRY
$619M
| $18.1M | 0.03% |
798
+537
| +206% | +$126K |
|
304
CALL
Dollar General
DG
$29.4B
| $18.1M | 0.03% |
893
+406
| +83% | +$80.6K |
|
305
CALL
Spotify
SPOT
$112B
| $18.1M | 0.03% |
675
-305
| -31% | -$95.1K |
|
|
TYNS
306
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $18.1M | 0.03% |
1,992
-1,085
| -35% | -$9.85M |
|
307
CALL
Dropbox
DBX
$7.57B
| $18M | 0.03% |
6,759
+2,945
| +77% | +$70.9K |
|
308
CALL
XPeng
XPEV
$10.5B
| $17.9M | 0.03% |
4,915
-353
| -7% | -$14.7K |
|
|
WBA
309
CALL
DELISTED
Walgreens Boots Alliance
WBA
| $17.9M | 0.03% |
3,257
+67
| +2% | +$3.31K |
|
310
PUT
Fiverr
FVRR
$333M
| $17.7M | 0.03% |
814
+459
| +129% | +$112K |
|
311
PUT
Fastly Inc
FSLY
$3.28B
| $17.7M | 0.03% |
2,624
-1,922
| -42% | -$165K |
|
312
PUT
TJX Companies
TJX
$145B
| $17.6M | 0.03% |
2,660
+290
| +12% | +$19.4K |
|
313
CALL
Nucor
NUE
$59.2B
| $17.5M | 0.03% |
2,180
+1,245
| +133% | +$75.5K |
|
314
Citigroup
C
$231B
| $17.5M | 0.03% |
239,907
+112,333
| +88% | +$7.5M |
|
|
DFS
315
PUT
DELISTED
Discover Financial Services
DFS
| $17.1M | 0.03% |
1,800
-752
| -29% | -$70.9K |
|
316
CALL
Valero Energy
VLO
$107B
| $16.8M | 0.03% |
2,352
-318
| -12% | -$21.6K |
|
317
Pfizer
PFE
$162B
| $16.8M | 0.03% |
+464,628
| New | +$16.5M |
|
318
PUT
Lemonade
LMND
$4.13B
| $16.8M | 0.03% |
1,805
+736
| +69% | +$95.1K |
|
319
PUT
Abbott
ABT
$187B
| $16.7M | 0.03% |
+1,396
| New | +$165K |
|
320
PUT
Aramark
ARMK
$15B
| $16.5M | 0.03% |
6,059
+598
| +11% | +$16.4K |
|
321
PUT
TripAdvisor
TRIP
$1.09B
| $16.3M | 0.03% |
3,029
+591
| +24% | +$25.4K |
|
|
WBA
322
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $16.3M | 0.03% |
2,963
+413
| +16% | +$20.4K |
|
323
CALL
Ford
F
$58.3B
| $16.2M | 0.03% |
13,256
+2,701
| +26% | +$30.9K |
|
324
PUT
D.R. Horton
DHI
$39.9B
| $16.2M | 0.03% |
1,820
-429
| -19% | -$33.6K |
|
325
CALL
GE Aerospace
GE
$350B
| $16.2M | 0.03% |
2,473
-357
| -13% | -$21.6K |
|
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's Q1 2021 filing shows 2,255 new, 3,360 increased, 3,150 reduced and 1,707 closed positions. Its largest new stake was Pfizer: 464,628 shares worth $16.8M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Miscellaneous at 97% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 2,255 new positions and closed 1,707 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.