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 | |
|---|---|---|---|---|---|---|
276
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $53M | 0.04% |
64,400
+2,200
| +4% | +$1.73M |
|
277
CALL
Ford
F
$57.5B
| $52.6M | 0.04% |
4,233,200
-529,700
| -11% | -$6.88M |
|
278
CALL
Merck
MRK
$315B
| $52.4M | 0.04% |
509,100
+29,500
| +6% | +$3.18M |
|
279
CALL
Unity
U
$12.8B
| $52M | 0.04% |
1,658,000
-139,300
| -8% | -$5.36M |
|
280
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $51.9M | 0.04% |
2,610,900
-237,400
| -8% | -$12M |
|
|
281
PUT
Ford
F
$57.5B
| $51.7M | 0.04% |
4,162,900
+1,101,600
| +36% | +$14.3M |
|
|
SPLK
282
PUT
DELISTED
Splunk Inc
SPLK
| $51.7M | 0.04% |
353,300
+76,600
| +28% | +$8.68M |
|
|
NVO
283
CALL
Novo Nordisk
NVO
$213B
| $51.6M | 0.04% |
567,600
+279,600
| +97% | +$24.6M |
|
284
CALL
Roku
ROKU
$21.2B
| $51.4M | 0.04% |
728,400
+148,000
| +25% | +$11.5M |
|
|
285
Apple
AAPL
$4.79T
| $51.2M | 0.04% |
+299,259
| New | +$54.9M |
|
286
PUT
American Express
AXP
$238B
| $51.1M | 0.04% |
342,800
+55,500
| +19% | +$9.08M |
|
287
PUT
DraftKings
DKNG
$11.3B
| $50.8M | 0.04% |
1,725,600
-224,200
| -11% | -$6.62M |
|
|
X
288
PUT
DELISTED
US Steel
X
| $50.4M | 0.04% |
1,552,800
+120,900
| +8% | +$3.39M |
|
289
PUT
Dollar General
DG
$26.5B
| $49.4M | 0.04% |
467,100
+287,300
| +160% | +$42.8M |
|
290
CALL
Mercado Libre
MELI
$91.2B
| $49.3M | 0.04% |
38,900
-31,000
| -44% | -$39.4M |
|
291
PayPal
PYPL
$49B
| $48.9M | 0.04% |
836,961
+187,735
| +29% | +$12.2M |
|
|
HES
292
CALL
DELISTED
Hess
HES
| $48.5M | 0.04% |
316,900
+213,400
| +206% | +$32.1M |
|
293
CALL
Autodesk
ADSK
$43B
| $47.4M | 0.04% |
228,900
+58,700
| +34% | +$12.3M |
|
294
PUT
PepsiCo
PEP
$185B
| $47M | 0.04% |
277,200
-142,300
| -34% | -$25.8M |
|
295
CALL
Etsy
ETSY
$7.64B
| $47M | 0.04% |
727,100
+406,500
| +127% | +$32.1M |
|
296
CALL
Booking.com
BKNG
$138B
| $46.9M | 0.04% |
380,000
-270,000
| -42% | -$32.7M |
|
297
Microsoft
MSFT
$2.9T
| $46.5M | 0.04% |
147,215
-24,720
| -14% | -$8.17M |
|
298
PUT
Blackrock
BLK
$164B
| $46.5M | 0.04% |
71,900
+33,400
| +87% | +$23.3M |
|
|
299
CALL
Dollar General
DG
$26.5B
| $46.5M | 0.04% |
439,100
+127,900
| +41% | +$19.1M |
|
|
300
CALL
PepsiCo
PEP
$185B
| $46.1M | 0.04% |
271,800
-19,200
| -7% | -$3.49M |
|
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.