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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
201
PUT
Strategy Inc
MSTR
$36.3B
| $70.8M | 0.06% |
2,156,000
-394,000
| -15% | -$14.8M |
|
202
CALL
ServiceNow
NOW
$98.4B
| $70.7M | 0.06% |
632,500
-353,000
| -36% | -$40.3M |
|
|
203
SPDR Gold Trust
GLD
$133B
| $70.7M | 0.06% |
412,396
+383,764
| +1,340% | +$68.6M |
|
204
CALL
Sea Limited
SE
$64.3B
| $70.5M | 0.06% |
1,605,100
+1,111,500
| +225% | +$54.3M |
|
205
PUT
MongoDB
MDB
$24.5B
| $70.2M | 0.06% |
203,100
-63,700
| -24% | -$24.2M |
|
206
CALL
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$254M
| $70M | 0.06% |
2,170,000
-2,536,800
| -54% | -$94.3M |
|
207
CALL
Ulta Beauty
ULTA
$20.8B
| $69.6M | 0.05% |
174,300
+65,700
| +60% | +$28.7M |
|
208
CALL
Zscaler
ZS
$23B
| $69.3M | 0.05% |
445,500
+80,700
| +22% | +$12.1M |
|
209
CALL
ConocoPhillips
COP
$145B
| $69.2M | 0.05% |
577,500
-26,100
| -4% | -$3.03M |
|
210
CALL
Rivian
RIVN
$24.9B
| $69.2M | 0.05% |
2,848,100
+331,800
| +13% | +$7.75M |
|
211
PUT
United Parcel Service
UPS
$98.5B
| $69.1M | 0.05% |
443,100
+86,000
| +24% | +$14.8M |
|
212
PUT
JD.com
JD
$40.7B
| $67.8M | 0.05% |
2,328,300
+334,200
| +17% | +$11.6M |
|
|
UWC
213
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $67.3M | 0.05% |
1,859,400
-426,300
| -19% | -$15.4M |
|
214
PUT
Autodesk
ADSK
$43B
| $67.2M | 0.05% |
324,700
+127,600
| +65% | +$26.8M |
|
|
215
CALL
MongoDB
MDB
$24.5B
| $66.3M | 0.05% |
191,700
+8,700
| +5% | +$3.3M |
|
216
PUT
Lockheed Martin
LMT
$119B
| $66.2M | 0.05% |
161,900
+57,700
| +55% | +$25.6M |
|
217
PUT
Albemarle
ALB
$13.8B
| $65.8M | 0.05% |
386,700
-111,500
| -22% | -$22.2M |
|
218
CALL
Medtronic
MDT
$105B
| $65.6M | 0.05% |
836,800
+473,200
| +130% | +$39.6M |
|
219
CALL
Bristol-Myers Squibb
BMY
$124B
| $64.9M | 0.05% |
1,118,300
+294,100
| +36% | +$18M |
|
220
Pfizer
PFE
$142B
| $64.9M | 0.05% |
1,955,694
+1,430,473
| +272% | +$50.6M |
|
221
PUT
AbbVie
ABBV
$448B
| $64.6M | 0.05% |
433,500
-159,500
| -27% | -$23.4M |
|
|
222
PUT
Rivian
RIVN
$24.9B
| $64.1M | 0.05% |
2,639,100
+353,500
| +15% | +$8.25M |
|
|
223
PUT
Ulta Beauty
ULTA
$20.8B
| $64M | 0.05% |
160,300
+13,500
| +9% | +$5.9M |
|
224
PUT
RH
RH
$3.31B
| $64M | 0.05% |
242,100
+151,100
| +166% | +$52.5M |
|
225
CALL
Lam Research
LRCX
$399B
| $64M | 0.05% |
1,021,000
-32,000
| -3% | -$2.1M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.