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 | |
|---|---|---|---|---|---|---|
251
PUT
Blackstone
BX
$150B
| $70.3M | 0.04% |
634,900
-137,800
| -18% | -$14.9M |
|
252
PUT
DoorDash
DASH
$77.4B
| $70.1M | 0.04% |
709,300
+293,000
| +70% | +$25.9M |
|
253
CALL
Pinterest
PINS
$12.6B
| $69.2M | 0.04% |
1,869,300
-787,500
| -30% | -$24.8M |
|
254
PUT
Roblox
RBLX
$35.5B
| $68.8M | 0.04% |
1,504,800
+248,300
| +20% | +$9.17M |
|
255
PUT
Roku
ROKU
$21.2B
| $68.7M | 0.04% |
749,300
+178,900
| +31% | +$15M |
|
256
CALL
Arm
ARM
$303B
| $68.4M | 0.04% |
910,900
+561,600
| +161% | +$32.8M |
|
|
NVO
257
CALL
Novo Nordisk
NVO
$213B
| $67.3M | 0.04% |
650,800
+83,200
| +15% | +$8.23M |
|
258
PUT
Deere & Co
DE
$164B
| $67.3M | 0.04% |
168,300
+9,500
| +6% | +$3.58M |
|
259
CALL
Dollar General
DG
$26.5B
| $66.3M | 0.04% |
487,500
+48,400
| +11% | +$5.87M |
|
260
CALL
ConocoPhillips
COP
$145B
| $65.9M | 0.04% |
567,700
-9,800
| -2% | -$1.15M |
|
261
CALL
Delta Air Lines
DAL
$54.9B
| $65.4M | 0.04% |
1,625,800
+431,900
| +36% | +$15.7M |
|
262
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $65.1M | 0.04% |
74,100
+9,700
| +15% | +$7.99M |
|
263
CALL
Humana
HUM
$47.7B
| $65.1M | 0.04% |
142,100
+76,300
| +116% | +$37.6M |
|
264
CALL
CVS Health
CVS
$138B
| $64.9M | 0.04% |
822,100
-217,700
| -21% | -$15.5M |
|
265
PUT
Zscaler
ZS
$23B
| $64.8M | 0.04% |
292,700
+12,700
| +5% | +$2.35M |
|
266
CALL
Kenvue
KVUE
$36.7B
| $64.7M | 0.04% |
3,003,500
+1,186,900
| +65% | +$23.8M |
|
267
PUT
Arista Networks
ANET
$220B
| $64.6M | 0.04% |
1,097,600
+344,000
| +46% | +$18.1M |
|
268
CALL
Applied Materials
AMAT
$440B
| $64.6M | 0.04% |
398,600
-178,300
| -31% | -$26.2M |
|
269
CALL
Charter Communications
CHTR
$15.9B
| $64.6M | 0.04% |
166,200
+23,700
| +17% | +$9.66M |
|
270
CALL
Zoom
ZM
$25.2B
| $64.5M | 0.04% |
897,400
+12,800
| +1% | +$846K |
|
|
271
PUT
Dollar General
DG
$26.5B
| $64.2M | 0.04% |
472,600
+5,500
| +1% | +$667K |
|
272
CALL
ServiceNow
NOW
$98.4B
| $64M | 0.04% |
453,000
-179,500
| -28% | -$22.6M |
|
273
CALL
Mercado Libre
MELI
$91.2B
| $63.6M | 0.04% |
40,500
+1,600
| +4% | +$2.27M |
|
274
CALL
United Rentals
URI
$64.8B
| $63.4M | 0.04% |
110,500
+52,800
| +92% | +$24.9M |
|
275
CALL
Marvell Technology
MRVL
$189B
| $62.9M | 0.04% |
1,042,800
-660,300
| -39% | -$35.7M |
|
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.