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 | |
|---|---|---|---|---|---|---|
226
CALL
Caterpillar
CAT
$415B
| $65.8M | 0.07% |
318,200
-153,200
| -32% | -$30.8M |
|
227
CALL
Lucid Motors
LCID
$2.79B
| $65.8M | 0.07% |
+172,800
| New | +$65.1M |
|
228
PUT
American Express
AXP
$238B
| $65.4M | 0.07% |
400,000
+159,200
| +66% | +$27.1M |
|
229
CALL
ARK Space & Defense Innovation ETF
ARKX
$829M
| $65.2M | 0.07% |
963,200
-140,800
| -13% | -$2.78M |
|
230
CALL
Affirm
AFRM
$24.9B
| $65.1M | 0.07% |
647,500
+539,600
| +500% | +$71.3M |
|
231
PUT
iShares Silver Trust
SLV
$29B
| $65M | 0.07% |
3,024,000
-837,000
| -22% | -$18.1M |
|
232
CALL
Marvell Technology
MRVL
$192B
| $64.5M | 0.07% |
736,800
+405,100
| +122% | +$30.3M |
|
233
CALL
Abbott
ABT
$175B
| $64.1M | 0.06% |
455,800
+84,700
| +23% | +$10.8M |
|
234
PUT
Cloudflare
NET
$95.3B
| $63.1M | 0.06% |
479,900
+193,600
| +68% | +$32.4M |
|
235
CALL
United Parcel Service
UPS
$99.1B
| $62.6M | 0.06% |
292,100
-141,700
| -33% | -$28.8M |
|
236
PUT
Delta Air Lines
DAL
$55.5B
| $62.3M | 0.06% |
1,595,300
+484,600
| +44% | +$19.4M |
|
237
PUT
Bristol-Myers Squibb
BMY
$125B
| $61.7M | 0.06% |
988,900
+624,400
| +171% | +$36.6M |
|
|
238
PUT
Caterpillar
CAT
$415B
| $61.2M | 0.06% |
296,100
-177,500
| -37% | -$35.7M |
|
239
CALL
Southwest Airlines
LUV
$23.6B
| $61.2M | 0.06% |
1,427,700
+804,500
| +129% | +$37.8M |
|
240
PUT
Twilio
TWLO
$28B
| $61.1M | 0.06% |
231,900
+101,000
| +77% | +$30.2M |
|
241
CALL
Zillow
Z
$7.21B
| $61M | 0.06% |
956,900
+786,000
| +460% | +$56.6M |
|
242
PUT
Union Pacific
UNP
$174B
| $60.6M | 0.06% |
240,400
+90,200
| +60% | +$21.4M |
|
243
CALL
DraftKings
DKNG
$11.4B
| $60.5M | 0.06% |
2,200,800
+766,100
| +53% | +$30M |
|
244
PUT
Expedia Group
EXPE
$31.8B
| $60.3M | 0.06% |
333,400
-76,000
| -19% | -$12.9M |
|
245
CALL
Pinterest
PINS
$12.6B
| $59.5M | 0.06% |
1,637,700
+718,100
| +78% | +$31.9M |
|
246
CALL
ServiceNow
NOW
$99.7B
| $59.3M | 0.06% |
456,500
-297,000
| -39% | -$39M |
|
247
PUT
Merck
MRK
$317B
| $59M | 0.06% |
1,090,200
+275,200
| +34% | +$21.9M |
|
248
CALL
Zscaler
ZS
$23.3B
| $58.6M | 0.06% |
182,400
-27,100
| -13% | -$8.53M |
|
249
PUT
CrowdStrike
CRWD
$191B
| $58.4M | 0.06% |
1,141,600
-490,800
| -30% | -$29.9M |
|
250
CALL
Roblox
RBLX
$36B
| $58.1M | 0.06% |
562,900
+2,900
| +0.5% | +$282K |
|
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.