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 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$42.6M |
| 2 |
Shopify
SHOP
|
+$39.6M |
| 3 |
iShares China Large-Cap ETF
FXI
|
+$35.4M |
| 4 |
Verizon
VZ
|
+$34.1M |
| 5 |
KraneShares CSI China Internet ETF
KWEB
|
+$34.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$49.5M |
| 2 |
GE Aerospace
GE
|
+$35.2M |
| 3 |
Carnival Corporation Ltd
CCL
|
+$30.5M |
| 4 |
Advanced Micro Devices
AMD
|
+$28.8M |
| 5 |
Micron Technology
MU
|
+$23.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.61% |
| 2 | Consumer Discretionary | 0.43% |
| 3 | Healthcare | 0.35% |
| 4 | Communication Services | 0.23% |
| 5 | Financials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
476
CALL
American Tower
AMT
$77.4B
| $21.7M | 0.02% |
74,300
+38,000
| +105% | +$10.4M |
|
477
PUT
CarMax
KMX
$8.15B
| $21.7M | 0.02% |
166,600
+45,700
| +38% | +$6.4M |
|
478
CALL
Sunrun
RUN
$2.61B
| $21.7M | 0.02% |
632,200
+528,965
| +512% | +$24.8M |
|
479
PUT
Pinduoduo
PDD
$119B
| $21.7M | 0.02% |
371,900
-322,900
| -46% | -$25.5M |
|
480
CALL
Kohl's
KSS
$2.16B
| $21.7M | 0.02% |
438,800
+303,700
| +225% | +$15.5M |
|
481
CALL
Dick's Sporting Goods
DKS
$18.8B
| $21.7M | 0.02% |
188,400
+134,100
| +247% | +$16.1M |
|
482
ARK Innovation ETF
ARKK
$6.23B
| $21.7M | 0.02% |
229,004
+223,493
| +4,055% | +$24.4M |
|
483
PUT
KLA
KLAC
$280B
| $21.6M | 0.02% |
502,000
+115,000
| +30% | +$4.44M |
|
|
SPLK
484
PUT
DELISTED
Splunk Inc
SPLK
| $21.5M | 0.02% |
186,200
-133,600
| -42% | -$18.7M |
|
485
PUT
Li Auto
LI
$12B
| $21.5M | 0.02% |
670,900
-74,500
| -10% | -$2.3M |
|
486
PUT
RTX Corp
RTX
$262B
| $21.5M | 0.02% |
250,500
-136,514
| -35% | -$11.9M |
|
487
Caesars Entertainment
CZR
$6.1B
| $21.4M | 0.02% |
228,901
+172,257
| +304% | +$17.5M |
|
488
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $21.4M | 0.02% |
41,300
+1,800
| +5% | +$916K |
|
489
PUT
AstraZeneca
AZN
$263B
| $21.3M | 0.02% |
183,250
+21,950
| +14% | +$2.58M |
|
490
PUT
eBay
EBAY
$49.3B
| $21.3M | 0.02% |
320,900
-121,700
| -27% | -$8.69M |
|
491
CALL
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$254M
| $21.2M | 0.02% |
3,494,800
+202,800
| +6% | +$5.17M |
|
492
PUT
Amgen
AMGN
$198B
| $21.2M | 0.02% |
94,300
-36,400
| -28% | -$7.68M |
|
493
SoFi Technologies
SOFI
$21.9B
| $21M | 0.02% |
1,328,904
+956,226
| +257% | +$17.6M |
|
494
CALL
Workday
WDAY
$32.7B
| $20.7M | 0.02% |
75,800
-14,200
| -16% | -$3.94M |
|
495
PUT
Proshares UltraShort Technology
REW
$3.3M
| $20.7M | 0.02% |
95,563
+66,832
| +233% | +$7.9M |
|
496
Trade Desk
TTD
$8.26B
| $20.6M | 0.02% |
224,400
+1,018
| +0.5% | +$89.2K |
|
497
CALL
Futu Holdings
FUTU
$14.9B
| $20.5M | 0.02% |
472,900
+326,200
| +222% | +$18.6M |
|
498
CALL
Danaher
DHR
$126B
| $20.5M | 0.02% |
70,162
+41,060
| +141% | +$11.3M |
|
499
CALL
Cigna
CI
$75.4B
| $20.5M | 0.02% |
89,100
+57,200
| +179% | +$12.2M |
|
500
PUT
United Rentals
URI
$64.8B
| $20.4M | 0.02% |
61,400
+9,100
| +17% | +$3.24M |
|
Similar funds
Simplex Trading's Q4 2021 Portfolio in Review
As of Q4 2021, Simplex Trading held 12,077 positions worth $99B, down 7.5% from $107B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading withdrew a net $10.8B in Q4 2021, closing 1,645 positions and reducing 4,258 holdings. Its most notable exit was Carnival Corporation Ltd, an estimated $30.5M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.61% of assets, up from 0.49% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares China Large-Cap ETF worth $33M.
- Simplex Trading's largest Q4 2021 buy was iShares China Large-Cap ETF: 902,666 shares worth $33M.
- Simplex Trading added most to State Street Financial Select Sector SPDR ETF in Q4 2021, an estimated $42.6M increase.
- Simplex Trading's biggest Q4 2021 reduction was AMC Entertainment Holdings, cutting an estimated $49.5M.
- Simplex Trading fully exited Carnival Corporation Ltd in Q4 2021, selling an estimated $30.5M.
- Simplex Trading's ten largest holdings make up 33% of its $99B portfolio in Q4 2021.
- Simplex Trading opened 2,269 new positions and closed 1,645 in Q4 2021.
- Simplex Trading's portfolio value fell 7.5% quarter-over-quarter to $99B.
Based on Simplex Trading's 13F filing for Q4 2021, filed 4 Feb 2022.