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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
CALL
Okta
OKTA
$23.8B
| $57.6M | 0.04% |
636,400
+241,500
| +61% | +$18.4M |
|
302
CALL
Etsy
ETSY
$7.64B
| $57.2M | 0.04% |
705,800
-21,300
| -3% | -$1.52M |
|
303
CALL
Phillips 66
PSX
$84.8B
| $56.9M | 0.04% |
427,200
+120,500
| +39% | +$14.4M |
|
304
CALL
Ford
F
$57.5B
| $56.7M | 0.04% |
4,652,300
+419,100
| +10% | +$4.66M |
|
305
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $56.6M | 0.04% |
1,507,700
-150,300
| -9% | -$8.15M |
|
306
PUT
Linde
LIN
$235B
| $56.5M | 0.04% |
137,500
+43,400
| +46% | +$17.1M |
|
307
CALL
PepsiCo
PEP
$185B
| $56.4M | 0.04% |
332,300
+60,500
| +22% | +$10M |
|
308
PUT
SoFi Technologies
SOFI
$21.9B
| $56.4M | 0.04% |
5,667,000
+2,794,800
| +97% | +$22.2M |
|
309
PUT
Dick's Sporting Goods
DKS
$18.8B
| $56.4M | 0.04% |
383,700
+109,600
| +40% | +$13.3M |
|
310
PUT
Mercado Libre
MELI
$91.2B
| $55.8M | 0.04% |
35,500
+14,800
| +71% | +$21M |
|
311
PUT
United Parcel Service
UPS
$98.5B
| $55.7M | 0.04% |
477,500
+34,400
| +8% | +$5.2M |
|
312
PUT
Norwegian Cruise Line
NCLH
$8.87B
| $55.7M | 0.04% |
2,781,100
+1,332,800
| +92% | +$21.4M |
|
313
CALL
Estee Lauder
EL
$29.9B
| $55.5M | 0.04% |
379,800
+176,200
| +87% | +$23.4M |
|
|
314
Citigroup
C
$222B
| $55.3M | 0.04% |
1,075,290
+889,575
| +479% | +$39.4M |
|
|
315
CALL
SoFi Technologies
SOFI
$21.9B
| $55M | 0.04% |
5,530,900
+1,708,700
| +45% | +$13.6M |
|
316
CALL
Cloudflare
NET
$95.5B
| $54.9M | 0.04% |
659,200
+56,500
| +9% | +$3.95M |
|
317
CALL
Honeywell
HON
$73.8B
| $54.1M | 0.03% |
273,844
+23,130
| +9% | +$4.17M |
|
318
CALL
Blackrock
BLK
$164B
| $53.8M | 0.03% |
66,300
+21,800
| +49% | +$15.2M |
|
319
PUT
Wynn Resorts
WYNN
$9.79B
| $53.8M | 0.03% |
590,400
-17,100
| -3% | -$1.52M |
|
320
PUT
Datadog
DDOG
$87.5B
| $53.7M | 0.03% |
442,200
-9,200
| -2% | -$948K |
|
321
PUT
Unity
U
$12.8B
| $53.7M | 0.03% |
1,312,400
+39,600
| +3% | +$1.22M |
|
322
CALL
Robinhood
HOOD
$93.8B
| $53.6M | 0.03% |
4,205,900
+2,728,800
| +185% | +$27.1M |
|
323
PUT
Moderna
MRNA
$23B
| $53.5M | 0.03% |
537,800
-193,500
| -26% | -$16.3M |
|
324
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $53.3M | 0.03% |
235,680
-12,150
| -5% | -$5.81M |
|
325
PUT
Marvell Technology
MRVL
$189B
| $53.1M | 0.03% |
879,900
-197,700
| -18% | -$10.7M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.