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 | Miscellaneous | 98.25% |
| 2 | Technology | 0.44% |
| 3 | Consumer Discretionary | 0.32% |
| 4 | Healthcare | 0.22% |
| 5 | Financials | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1726
FMC
FMC
$1.58B
| $3.02M | ﹤0.01% |
+45,178
| New | +$3.91M |
|
1727
PUT
TD Synnex
SNX
$20.9B
| $3.02M | ﹤0.01% |
30,300
+29,600
| +4,229% | +$2.93M |
|
1728
CALL
2x Long VIX Futures ETF
UVIX
$176M
| $3.02M | ﹤0.01% |
240
+155
| +182% | +$1.18M |
|
1729
CALL
Amylyx Pharmaceuticals
AMLX
$3.84B
| $3.01M | ﹤0.01% |
164,500
-38,300
| -19% | -$810K |
|
1730
PUT
Chegg
CHGG
$88.8M
| $3.01M | ﹤0.01% |
337,500
+29,800
| +10% | +$291K |
|
1731
PUT
Huntington Bancshares
HBAN
$34B
| $3.01M | ﹤0.01% |
289,400
+83,500
| +41% | +$937K |
|
1732
PUT
Ciena
CIEN
$48.6B
| $3M | ﹤0.01% |
63,600
+46,000
| +261% | +$2.03M |
|
1733
CALL
Halozyme
HALO
$12.2B
| $3M | ﹤0.01% |
78,600
+12,500
| +19% | +$512K |
|
1734
PUT
Ecolab
ECL
$77.7B
| $3M | ﹤0.01% |
17,700
+6,100
| +53% | +$1.11M |
|
1735
PUT
AutoNation
AN
$6.96B
| $3M | ﹤0.01% |
19,800
-54,400
| -73% | -$8.68M |
|
1736
PUT
Nexstar Media Group
NXST
$5.39B
| $3M | ﹤0.01% |
20,900
+20,200
| +2,886% | +$3.28M |
|
1737
PUT
Thomson Reuters
TRI
$43.1B
| $3M | ﹤0.01% |
24,122
+22,941
| +1,943% | +$3.02M |
|
1738
CALL
FerroAtlántica
GSM
$875M
| $2.99M | ﹤0.01% |
575,900
+118,400
| +26% | +$615K |
|
1739
PUT
Banc of California
BANC
$2.99B
| $2.98M | ﹤0.01% |
241,100
+240,900
| +120,450% | +$3.07M |
|
1740
PUT
Molina Healthcare
MOH
$10.3B
| $2.98M | ﹤0.01% |
9,100
+5,800
| +176% | +$1.83M |
|
1741
PUT
Universal Health Services
UHS
$9.96B
| $2.98M | ﹤0.01% |
23,700
+14,300
| +152% | +$1.95M |
|
1742
CALL
Inspire Medical Systems
INSP
$1.8B
| $2.98M | ﹤0.01% |
15,000
+1,200
| +9% | +$303K |
|
1743
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.1M
| $2.98M | ﹤0.01% |
70,500
-70,400
| -50% | -$2.56M |
|
1744
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$70.8M
| $2.97M | ﹤0.01% |
41,200
+4,900
| +13% | +$357K |
|
1745
CALL
Ball Corp
BALL
$16.3B
| $2.97M | ﹤0.01% |
59,600
-24,100
| -29% | -$1.32M |
|
1746
CALL
Targa Resources
TRGP
$62.7B
| $2.96M | ﹤0.01% |
34,600
-91,400
| -73% | -$7.57M |
|
1747
VanEck Junior Gold Miners ETF
GDXJ
$9.54B
| $2.96M | ﹤0.01% |
91,879
-53,792
| -37% | -$1.91M |
|
1748
iShares Russell 2000 Growth ETF
IWO
$14.7B
| $2.96M | ﹤0.01% |
13,203
+10,953
| +487% | +$2.62M |
|
|
1749
CALL
Ciena
CIEN
$48.6B
| $2.96M | ﹤0.01% |
62,600
+32,600
| +109% | +$1.44M |
|
|
WW
1750
CALL
DELISTED
WW International
WW
| $2.95M | ﹤0.01% |
266,700
+13,600
| +5% | +$134K |
|
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's Q3 2023 filing shows 1,401 new, 3,688 increased, 3,363 reduced and 1,719 closed positions. Its largest new stake was Amazon: 841,102 shares worth $107M. The largest sale was Netflix, an estimated $27.1M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 1,401 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.