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 | |
|---|---|---|---|---|---|---|
376
CALL
Philip Morris
PM
$298B
| $13.2M | 0.02% |
1,490
-1,260
| -46% | -$107K |
|
377
PUT
PNC Financial Services
PNC
$99.5B
| $13.2M | 0.02% |
752
-10
| -1% | -$1.65K |
|
|
LSI
378
PUT
DELISTED
Life Storage, Inc.
LSI
| $13.1M | 0.02% |
1,219
-116
| -9% | -$9.64K |
|
|
SBNY
379
CALL
DELISTED
Signature Bank
SBNY
| $13M | 0.02% |
577
+451
| +358% | +$88.9K |
|
380
PUT
Tencent Music
TME
$14.3B
| $12.9M | 0.02% |
6,306
+4,992
| +380% | +$127K |
|
381
CALL
Intercontinental Exchange
ICE
$81B
| $12.9M | 0.02% |
1,154
+3
| +0.3% | +$340 |
|
382
PUT
Dollar General
DG
$25.4B
| $12.9M | 0.02% |
635
+19
| +3% | +$3.77K |
|
|
FTOC
383
CALL
DELISTED
FTAC Olympus Acquisition Corp. Class A Ordinary Shares
FTOC
| $12.8M | 0.02% |
+12,099
| New | +$142K |
|
384
PUT
Vanguard FTSE Europe ETF
VGK
$29.8B
| $12.7M | 0.02% |
2,146
-472
| -18% | -$29.4K |
|
|
COUP
385
CALL
DELISTED
Coupa Software Incorporated
COUP
| $12.7M | 0.02% |
499
-371
| -43% | -$117K |
|
|
386
Amazon
AMZN
$2.51T
| $12.7M | 0.02% |
82,000
-416,360
| -84% | -$66M |
|
387
CALL
VanEck Durable High Dividend ETF
DURA
$38.4M
| $12.7M | 0.02% |
934
+269
| +40% | +$7.76K |
|
388
PUT
Rio Tinto
RIO
$149B
| $12.6M | 0.02% |
1,626
+1,201
| +283% | +$98.5K |
|
389
CALL
Coherent
COHR
$61.3B
| $12.5M | 0.02% |
1,829
+1,130
| +162% | +$92.7K |
|
390
Salesforce
CRM
$129B
| $12.5M | 0.02% |
58,967
+35,063
| +147% | +$7.81M |
|
391
PUT
Intuitive Surgical
ISRG
$119B
| $12.5M | 0.02% |
507
-981
| -66% | -$247K |
|
392
PUT
Albemarle
ALB
$13.8B
| $12.4M | 0.02% |
850
-614
| -42% | -$98.5K |
|
393
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.3M
| $12.4M | 0.02% |
4,598
+621
| +16% | +$61.7K |
|
394
CALL
Alcoa
AA
$11.9B
| $12.4M | 0.02% |
3,810
+486
| +15% | +$12.3K |
|
395
PUT
Dave & Buster's
PLAY
$339M
| $12.4M | 0.02% |
2,584
-145
| -5% | -$5.66K |
|
396
PUT
Tyson Foods
TSN
$20B
| $12.4M | 0.02% |
1,665
+420
| +34% | +$29K |
|
397
CALL
American Electric Power
AEP
$73.4B
| $12.3M | 0.02% |
1,456
+432
| +42% | +$34.8K |
|
398
CALL
Blackrock
BLK
$161B
| $12.3M | 0.02% |
163
+41
| +34% | +$29.7K |
|
|
DOCU
399
DocuSign
DOCU
$8.98B
| $12.3M | 0.02% |
+60,689
| New | +$14.1M |
|
|
SIVB
400
PUT
DELISTED
SVB Financial Group
SIVB
| $12.2M | 0.02% |
248
+83
| +50% | +$40.8K |
|
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.