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 | |
|---|---|---|---|---|---|---|
451
Altria Group
MO
$120B
| $10.5M | 0.02% |
204,538
+64,767
| +46% | +$2.9M |
|
|
FISV
452
PUT
Fiserv Inc
FISV
$26.6B
| $10.5M | 0.02% |
+878
| New | +$101K |
|
453
CALL
CRISPR Therapeutics
CRSP
$4.68B
| $10.4M | 0.02% |
856
-79
| -8% | -$11.9K |
|
454
CALL
PACCAR
PCAR
$68.8B
| $10.4M | 0.02% |
1,683
+753
| +81% | +$47.1K |
|
|
DFS
455
CALL
DELISTED
Discover Financial Services
DFS
| $10.4M | 0.02% |
1,094
-316
| -22% | -$29.8K |
|
456
PUT
Northrop Grumman
NOC
$75.8B
| $10.4M | 0.02% |
320
-18
| -5% | -$5.43K |
|
457
Bilibili
BILI
$7.32B
| $10.3M | 0.02% |
+96,362
| New | +$11.8M |
|
458
PUT
Harley-Davidson
HOG
$2.79B
| $10.3M | 0.02% |
+2,567
| New | +$95.5K |
|
459
CALL
Affirm
AFRM
$23.8B
| $10.3M | 0.02% |
+1,453
| New | +$141K |
|
460
CALL
Illinois Tool Works
ITW
$79.7B
| $10.3M | 0.02% |
463
+177
| +62% | +$36.8K |
|
|
NKLA
461
PUT
DELISTED
Nikola Corporation Common Stock
NKLA
| $10.2M | 0.02% |
246
-186
| -43% | -$106K |
|
462
PUT
Valero Energy
VLO
$90.6B
| $10.2M | 0.02% |
1,431
-705
| -33% | -$47.9K |
|
463
Applied Materials
AMAT
$447B
| $10.2M | 0.02% |
+76,134
| New | +$8.4M |
|
464
PUT
Workday
WDAY
$31.6B
| $10.1M | 0.02% |
+407
| New | +$101K |
|
465
Trade Desk
TTD
$7.89B
| $10.1M | 0.02% |
154,390
+84,920
| +122% | +$6.56M |
|
466
PUT
Vipshop
VIPS
$6.92B
| $10M | 0.02% |
3,365
+1,942
| +136% | +$67K |
|
|
467
CALL
Vipshop
VIPS
$6.92B
| $10M | 0.02% |
3,355
+2,629
| +362% | +$90.7K |
|
|
SCIU
468
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $9.99M | 0.02% |
3,239
+1,599
| +98% | +$4.93M |
|
469
PUT
Sonos
SONO
$1.73B
| $9.98M | 0.02% |
2,665
+450
| +20% | +$15.2K |
|
|
SPLK
470
DELISTED
Splunk Inc
SPLK
| $9.98M | 0.02% |
+73,641
| New | +$11.5M |
|
471
PUT
Boston Properties
BXP
$10.8B
| $9.95M | 0.02% |
983
-377
| -28% | -$36.8K |
|
472
PUT
Colgate-Palmolive
CL
$72.1B
| $9.92M | 0.02% |
1,258
+238
| +23% | +$18.7K |
|
|
DENT
473
CALL
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $9.85M | 0.02% |
2,457
+1,698
| +224% | +$6.8M |
|
|
IPFF
474
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $9.82M | 0.02% |
3,071
+2,008
| +189% | +$32.6K |
|
|
DISH
475
PUT
DELISTED
DISH Network Corp.
DISH
| $9.8M | 0.02% |
+2,707
| New | +$90.1K |
|
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.