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 | |
|---|---|---|---|---|---|---|
426
Plug Power
PLUG
$3.06B
| $11.3M | 0.02% |
316,130
+242,868
| +332% | +$12.5M |
|
427
Boeing
BA
$165B
| $11.2M | 0.02% |
44,059
-34,197
| -44% | -$7.6M |
|
428
Futu Holdings
FUTU
$13.9B
| $11.2M | 0.02% |
70,525
+28,526
| +68% | +$3.53M |
|
429
PUT
Nucor
NUE
$54.9B
| $11.1M | 0.02% |
1,389
+373
| +37% | +$22.6K |
|
430
CALL
Kohl's
KSS
$2.06B
| $11.1M | 0.02% |
1,870
-2,478
| -57% | -$127K |
|
|
NUAN
431
CALL
DELISTED
Nuance Communications, Inc.
NUAN
| $11.1M | 0.02% |
2,554
+1,012
| +66% | +$46.5K |
|
432
CALL
Cleveland-Cliffs
CLF
$6.25B
| $11.1M | 0.02% |
5,521
+1,221
| +28% | +$19.9K |
|
433
PUT
Norfolk Southern
NSC
$78.3B
| $11.1M | 0.02% |
413
-86
| -17% | -$21.8K |
|
434
PUT
Lumentum
LITE
$64.9B
| $11M | 0.02% |
+1,206
| New | +$112K |
|
|
EXAS
435
CALL
DELISTED
Exact Sciences
EXAS
| $11M | 0.02% |
+834
| New | +$114K |
|
436
CALL
Colgate-Palmolive
CL
$72.1B
| $11M | 0.02% |
1,391
+862
| +163% | +$67.6K |
|
437
PUT
AB InBev
BUD
$155B
| $10.9M | 0.02% |
1,740
+372
| +27% | +$24K |
|
438
CALL
Altria Group
MO
$120B
| $10.9M | 0.02% |
2,129
-1,779
| -46% | -$79.7K |
|
439
PUT
Illumina
ILMN
$29.8B
| $10.9M | 0.02% |
291
-174
| -37% | -$70.9K |
|
440
CALL
Rio Tinto
RIO
$149B
| $10.8M | 0.02% |
1,397
+508
| +57% | +$41.7K |
|
441
CALL
Workhorse Group
WKHS
$30.1M
| $10.8M | 0.02% |
3
+1
| +50% | +$71.8K |
|
442
DraftKings
DKNG
$11.3B
| $10.7M | 0.02% |
174,874
+174,804
| +249,720% | +$10.5M |
|
443
CALL
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.3M
| $10.7M | 0.02% |
3,960
+317
| +9% | +$31.5K |
|
444
PUT
EOG Resources
EOG
$77.5B
| $10.7M | 0.02% |
1,474
+377
| +34% | +$24.1K |
|
445
CALL
Amplify Online Retail ETF
IBUY
$106M
| $10.6M | 0.02% |
1,863
+1,504
| +419% | +$193K |
|
446
PUT
Veeva Systems
VEEV
$29.2B
| $10.6M | 0.02% |
406
-95
| -19% | -$26.5K |
|
|
RDS.A
447
CALL
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $10.6M | 0.02% |
2,745
-1,730
| -39% | -$69.6K |
|
|
PPLI
448
CALL
People Inc
PPLI
$3.14B
| $10.5M | 0.02% |
894
+658
| +279% | +$81.7K |
|
449
PUT
Cummins
CMI
$91.8B
| $10.5M | 0.02% |
406
-198
| -33% | -$49.5K |
|
450
PUT
FuboTV Inc
FUBO
$254M
| $10.5M | 0.02% |
396
+97
| +32% | +$41.6K |
|
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 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.