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 | |
|---|---|---|---|---|---|---|
4776
CALL
BGC Group
BGC
$5.64B
| $136K | ﹤0.01% |
25,800
-2,000
| -7% | -$9.95K |
|
|
BRKL
4777
CALL
DELISTED
Brookline Bancorp
BRKL
| $136K | ﹤0.01% |
15,000
+13,000
| +650% | +$126K |
|
4778
CALL
Immersion
IMMR
$243M
| $136K | ﹤0.01% |
20,600
-3,100
| -13% | -$21.6K |
|
4779
CALL
Noble Corp
NE
$6.55B
| $136K | ﹤0.01% |
2,700
-800
| -23% | -$40.8K |
|
|
NOA
4780
CALL
North American Construction
NOA
$357M
| $136K | ﹤0.01% |
+6,300
| New | +$142K |
|
4781
Patrick Industries
PATK
$2.87B
| $136K | ﹤0.01% |
2,727
-2,012
| -42% | -$109K |
|
|
VMEO
4782
CALL
DELISTED
Vimeo
VMEO
| $136K | ﹤0.01% |
38,600
-5,400
| -12% | -$21.4K |
|
4783
PUT
Werner Enterprises
WERN
$2.2B
| $136K | ﹤0.01% |
3,500
+1,100
| +46% | +$47.2K |
|
4784
WEX
WEX
$6.42B
| $136K | ﹤0.01% |
+727
| New | +$140K |
|
4785
PUT
Worthington Enterprises
WOR
$2.74B
| $136K | ﹤0.01% |
3,568
+2,108
| +144% | +$92.6K |
|
|
SWN
4786
DELISTED
Southwestern Energy Company
SWN
| $136K | ﹤0.01% |
21,099
-10,190
| -33% | -$65K |
|
4787
iShares MSCI All Country Asia ex Japan ETF
AAXJ
$3.51B
| $135K | ﹤0.01% |
+2,134
| New | +$142K |
|
4788
PUT
United Therapeutics
UTHR
$26.1B
| $135K | ﹤0.01% |
600
-1,400
| -70% | -$322K |
|
4789
Watsco Inc
WSO
$13.2B
| $135K | ﹤0.01% |
+359
| New | +$130K |
|
4790
PUT
Atlanta Braves Holdings Series B
BATRK
$3.28B
| $134K | ﹤0.01% |
+3,700
| New | +$140K |
|
4791
CALL
Brookdale Senior Living
BKD
$3.55B
| $134K | ﹤0.01% |
32,500
+2,400
| +8% | +$9.64K |
|
4792
Barnes & Noble Education
BNED
$435M
| $134K | ﹤0.01% |
1,235
+730
| +145% | +$98.8K |
|
4793
Core Laboratories
CLB
$455M
| $134K | ﹤0.01% |
+5,613
| New | +$138K |
|
4794
CALL
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$532M
| $134K | ﹤0.01% |
4,200
-5,600
| -57% | -$187K |
|
4795
CALL
Old Republic International
ORI
$10.9B
| $134K | ﹤0.01% |
5,000
-8,500
| -63% | -$229K |
|
4796
Advanced Drainage Systems
WMS
$10.6B
| $134K | ﹤0.01% |
+1,184
| New | +$145K |
|
4797
PUT
AllianceBernstein
AB
$3.47B
| $133K | ﹤0.01% |
4,400
-36,200
| -89% | -$1.15M |
|
4798
CALL
Century Communities
CCS
$1.98B
| $133K | ﹤0.01% |
2,000
+500
| +33% | +$36.5K |
|
|
CIM
4799
PUT
Chimera Investment
CIM
$1.06B
| $133K | ﹤0.01% |
8,167
-1,866
| -19% | -$32.8K |
|
4800
Cerence
CRNC
$359M
| $133K | ﹤0.01% |
6,576
+1,326
| +25% | +$33.3K |
|
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.