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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
201
PUT
Target
TGT
$62.6B
| $94M | 0.05% |
1,047,700
+389,000
| +59% | +$38.3M |
|
202
PUT
Vertiv
VRT
$116B
| $93.6M | 0.05% |
620,700
-233,500
| -27% | -$31.1M |
|
203
CALL
Rocket Lab Corp
RKLB
$43.6B
| $93.6M | 0.05% |
1,954,000
+455,200
| +30% | +$20.6M |
|
204
PUT
Baidu
BIDU
$36.6B
| $93M | 0.05% |
706,000
+123,000
| +21% | +$12.2M |
|
|
205
Broadcom
AVGO
$1.89T
| $92.9M | 0.05% |
281,496
-270,198
| -49% | -$82.9M |
|
206
CALL
Riot Platforms
RIOT
$8.84B
| $92.6M | 0.05% |
4,863,500
+1,429,000
| +42% | +$19.8M |
|
207
PUT
Astera Labs
ALAB
$56.7B
| $92.3M | 0.05% |
471,200
+270,700
| +135% | +$44.5M |
|
208
PUT
GE Vernova
GEV
$265B
| $91.8M | 0.05% |
149,300
-17,200
| -10% | -$10.4M |
|
209
CALL
Wolfspeed
WOLF
$1.52B
| $91.4M | 0.05% |
3,196,800
+1,323,800
| +71% | +$3.1M |
|
210
PUT
Roblox
RBLX
$35.5B
| $91.1M | 0.05% |
657,900
-113,700
| -15% | -$14.1M |
|
|
XYZ
211
CALL
Block Inc
XYZ
$46.1B
| $91M | 0.05% |
1,259,500
-200,700
| -14% | -$15M |
|
212
PUT
Johnson & Johnson
JNJ
$615B
| $90.8M | 0.05% |
518,800
-53,900
| -9% | -$9.23M |
|
|
NVO
213
PUT
Novo Nordisk
NVO
$213B
| $90.4M | 0.05% |
1,628,500
+411,600
| +34% | +$24.1M |
|
214
CALL
Chipotle Mexican Grill
CMG
$41.3B
| $90.2M | 0.05% |
2,300,500
+903,700
| +65% | +$40.7M |
|
215
PUT
Rigetti Computing
RGTI
$5.06B
| $89.5M | 0.05% |
3,004,300
+1,070,600
| +55% | +$18.8M |
|
216
CALL
Procter & Gamble
PG
$347B
| $89.5M | 0.05% |
582,400
+2,300
| +0.4% | +$359K |
|
217
PUT
Trade Desk
TTD
$8.26B
| $89.5M | 0.05% |
1,825,700
+1,074,400
| +143% | +$68.2M |
|
218
CALL
Chevron
CVX
$384B
| $89.3M | 0.05% |
574,900
-467,600
| -45% | -$72.4M |
|
219
CALL
Applied Materials
AMAT
$440B
| $88.6M | 0.05% |
432,800
+2,500
| +0.6% | +$454K |
|
220
PUT
Hims & Hers Health
HIMS
$7.33B
| $88.5M | 0.05% |
1,560,000
-544,300
| -26% | -$27.9M |
|
221
CALL
Lockheed Martin
LMT
$119B
| $88.4M | 0.05% |
177,000
+41,600
| +31% | +$18.9M |
|
222
PUT
Vistra
VST
$56.2B
| $88M | 0.05% |
449,100
+136,500
| +44% | +$27M |
|
223
CALL
Lam Research
LRCX
$399B
| $87.6M | 0.05% |
654,300
-48,000
| -7% | -$5.08M |
|
224
PUT
Visa
V
$672B
| $86.9M | 0.04% |
308,200
-110,200
| -26% | -$38.1M |
|
|
225
CALL
Trade Desk
TTD
$8.26B
| $86.8M | 0.04% |
1,771,900
+891,800
| +101% | +$56.6M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.