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 | |
|---|---|---|---|---|---|---|
|
PRO
3926
CALL
DELISTED
PROS Holdings
PRO
| $304K | ﹤0.01% |
8,800
+2,800
| +47% | +$96.7K |
|
|
SILV
3927
DELISTED
SilverCrest Metals Inc. Common Shares
SILV
| $304K | ﹤0.01% |
69,112
+25,946
| +60% | +$132K |
|
3928
PUT
BioCryst Pharmaceuticals
BCRX
$2.48B
| $303K | ﹤0.01% |
42,800
+9,500
| +29% | +$68.3K |
|
3929
Sundial Growers
SNDL
$318M
| $303K | ﹤0.01% |
159,621
+47,633
| +43% | +$80.1K |
|
|
SPYM
3930
State Street SPDR Portfolio S&P 500 ETF
SPYM
$160B
| $303K | ﹤0.01% |
6,040
-1,093
| -15% | -$57.2K |
|
3931
CALL
Black Diamond Therapeutics
BDTX
$101M
| $302K | ﹤0.01% |
105,400
+21,700
| +26% | +$79.9K |
|
|
BLDP
3932
CALL
Ballard Power Systems
BLDP
$808M
| $302K | ﹤0.01% |
82,400
-20,700
| -20% | -$88.7K |
|
3933
CALL
Dorchester Minerals
DMLP
$1.3B
| $302K | ﹤0.01% |
10,400
-26,800
| -72% | -$799K |
|
3934
CALL
Global Net Lease
GNL
$1.86B
| $302K | ﹤0.01% |
31,500
+18,900
| +150% | +$204K |
|
3935
CALL
Healthcare Realty
HR
$7.58B
| $302K | ﹤0.01% |
19,800
-13,700
| -41% | -$243K |
|
3936
PUT
The GEO Group
GEO
$4.11B
| $301K | ﹤0.01% |
36,800
-44,800
| -55% | -$328K |
|
3937
PUT
Magnite
MGNI
$2.82B
| $301K | ﹤0.01% |
40,000
+22,500
| +129% | +$243K |
|
3938
CALL
TMC The Metals Company
TMC
$1.56B
| $301K | ﹤0.01% |
304,200
+143,600
| +89% | +$206K |
|
|
AIV
3939
Aimco
AIV
$375M
| $300K | ﹤0.01% |
44,195
-2,191
| -5% | -$17.4K |
|
3940
CALL
Ryan Specialty Holdings
RYAN
$5.96B
| $300K | ﹤0.01% |
6,200
-8,500
| -58% | -$394K |
|
3941
GitLab
GTLB
$5.57B
| $299K | ﹤0.01% |
6,615
-71,463
| -92% | -$3.42M |
|
|
ILPT
3942
CALL
Industrial Logistics Properties Trust
ILPT
$603M
| $299K | ﹤0.01% |
+103,800
| New | +$393K |
|
3943
PUT
Zurn Elkay Water Solutions
ZWS
$8.23B
| $299K | ﹤0.01% |
10,700
+4,500
| +73% | +$129K |
|
|
GOL
3944
PUT
DELISTED
Gol Linhas Aéreas Inteligentes S.A. American Depositary Shares (Each representing Ten Preferred Shares)
GOL
| $299K | ﹤0.01% |
109,400
+39,600
| +57% | +$140K |
|
3945
PUT
Anavex Life Sciences
AVXL
$238M
| $297K | ﹤0.01% |
45,400
+1,300
| +3% | +$10.3K |
|
3946
Coeur Mining
CDE
$15.4B
| $297K | ﹤0.01% |
133,905
+25,261
| +23% | +$65.9K |
|
3947
PUT
ATI
ATI
$25.5B
| $296K | ﹤0.01% |
7,200
+1,100
| +18% | +$48.9K |
|
3948
PUT
Concentrix
CNXC
$1.55B
| $296K | ﹤0.01% |
3,700
-12,600
| -77% | -$988K |
|
3949
IHS Holding
IHS
$2.78B
| $296K | ﹤0.01% |
+53,430
| New | +$396K |
|
3950
CALL
Kulicke & Soffa
KLIC
$4.76B
| $296K | ﹤0.01% |
6,100
-1,800
| -23% | -$95.4K |
|
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.