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 | |
|---|---|---|---|---|---|---|
2276
PUT
Weatherford International
WFRD
$6.36B
| $1.6M | ﹤0.01% |
+17,700
| New | +$1.5M |
|
2277
ArcelorMittal
MT
$50.4B
| $1.59M | ﹤0.01% |
63,450
+16,636
| +36% | +$442K |
|
|
ETNB
2278
DELISTED
89bio
ETNB
| $1.58M | ﹤0.01% |
102,675
+68,817
| +203% | +$1.16M |
|
|
HUT
2279
CALL
Hut 8
HUT
$12.4B
| $1.58M | ﹤0.01% |
162,660
-63,900
| -28% | -$907K |
|
2280
MP Materials
MP
$7.35B
| $1.58M | ﹤0.01% |
+83,019
| New | +$1.84M |
|
2281
Viatris
VTRS
$20.1B
| $1.58M | ﹤0.01% |
160,494
+45,206
| +39% | +$471K |
|
2282
Symbotic
SYM
$5.11B
| $1.58M | ﹤0.01% |
+47,316
| New | +$1.95M |
|
2283
CALL
Corteva
CTVA
$59.7B
| $1.58M | ﹤0.01% |
30,900
+4,000
| +15% | +$212K |
|
2284
CRISPR Therapeutics
CRSP
$4.58B
| $1.58M | ﹤0.01% |
34,794
+32,454
| +1,387% | +$1.68M |
|
2285
PUT
StoneCo
STNE
$2.62B
| $1.58M | ﹤0.01% |
148,000
+87,400
| +144% | +$1.08M |
|
2286
PUT
DigitalBridge
DBRG
$2.94B
| $1.58M | ﹤0.01% |
89,800
+47,300
| +111% | +$781K |
|
2287
CALL
Sundial Growers
SNDL
$324M
| $1.58M | ﹤0.01% |
830,300
-23,400
| -3% | -$39.4K |
|
|
DVAX
2288
CALL
DELISTED
Dynavax Technologies
DVAX
| $1.57M | ﹤0.01% |
106,700
+12,500
| +13% | +$176K |
|
2289
CALL
Camtek
CAMT
$6.9B
| $1.57M | ﹤0.01% |
25,200
+9,600
| +62% | +$474K |
|
2290
CALL
Valley National Bancorp
VLY
$7.93B
| $1.57M | ﹤0.01% |
183,000
-62,700
| -26% | -$569K |
|
2291
PUT
Golar LNG
GLNG
$4.95B
| $1.56M | ﹤0.01% |
64,500
+38,700
| +150% | +$892K |
|
|
HES
2292
DELISTED
Hess
HES
| $1.56M | ﹤0.01% |
+10,216
| New | +$1.54M |
|
2293
CALL
United Microelectronic
UMC
$48.9B
| $1.56M | ﹤0.01% |
221,500
+9,800
| +5% | +$71K |
|
2294
PUT
Amphenol
APH
$188B
| $1.56M | ﹤0.01% |
37,200
-40,600
| -52% | -$1.75M |
|
2295
PUT
Aclaris Therapeutics
ACRS
$730M
| $1.56M | ﹤0.01% |
227,700
+92,800
| +69% | +$793K |
|
2296
Griffon
GFF
$4.16B
| $1.56M | ﹤0.01% |
+39,308
| New | +$1.61M |
|
2297
ProShares Ultra Silver
AGQ
$1.16B
| $1.56M | ﹤0.01% |
63,266
+51,952
| +459% | +$1.47M |
|
2298
CALL
Skywest
SKYW
$4.11B
| $1.55M | ﹤0.01% |
37,000
+3,500
| +10% | +$147K |
|
2299
CALL
Workiva
WK
$2.94B
| $1.55M | ﹤0.01% |
15,300
+10,500
| +219% | +$1.09M |
|
2300
PUT
RB Global
RBA
$20.8B
| $1.54M | ﹤0.01% |
24,700
+24,300
| +6,075% | +$1.5M |
|
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.