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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2726
PUT
Altimmune
ALT
$539M
| $1.22M | ﹤0.01% |
199,500
+15,300
| +8% | +$104K |
|
2727
PUT
Burford Capital
BUR
$907M
| $1.22M | ﹤0.01% |
92,300
+45,500
| +97% | +$604K |
|
2728
Flex
FLEX
$43.4B
| $1.22M | ﹤0.01% |
+36,585
| New | +$1.13M |
|
2729
PUT
Semtech
SMTC
$11.7B
| $1.22M | ﹤0.01% |
26,800
-83,000
| -76% | -$3.05M |
|
2730
STAAR Surgical
STAA
$1.16B
| $1.22M | ﹤0.01% |
32,944
+25,197
| +325% | +$940K |
|
|
LINE
2731
CALL
Lineage Inc
LINE
$9.43B
| $1.22M | ﹤0.01% |
+15,600
| New | +$1.31M |
|
2732
CALL
Dorman Products
DORM
$4.01B
| $1.22M | ﹤0.01% |
10,800
+5,200
| +93% | +$547K |
|
2733
Magnite
MGNI
$2.65B
| $1.22M | ﹤0.01% |
88,159
+80,635
| +1,072% | +$1.1M |
|
2734
CALL
Xcel Energy
XEL
$51B
| $1.22M | ﹤0.01% |
18,700
-4,200
| -18% | -$249K |
|
2735
Carriage Services
CSV
$618M
| $1.22M | ﹤0.01% |
37,143
+9,067
| +32% | +$280K |
|
2736
PUT
EVgo
EVGO
$200M
| $1.22M | ﹤0.01% |
294,600
+181,800
| +161% | +$695K |
|
2737
CALL
Verra Mobility
VRRM
$615M
| $1.22M | ﹤0.01% |
43,800
-35,900
| -45% | -$1.01M |
|
2738
CALL
SSR Mining
SSRM
$5.57B
| $1.22M | ﹤0.01% |
214,200
+1,100
| +0.5% | +$5.76K |
|
2739
PUT
Ares Management
ARES
$28.5B
| $1.22M | ﹤0.01% |
7,800
-27,600
| -78% | -$4M |
|
2740
PUT
Tucows
TCX
$97.1M
| $1.22M | ﹤0.01% |
58,200
+38,400
| +194% | +$837K |
|
2741
Bread Financial
BFH
$4.21B
| $1.21M | ﹤0.01% |
25,531
+16,867
| +195% | +$859K |
|
2742
CALL
EPAM Systems
EPAM
$4.69B
| $1.21M | ﹤0.01% |
6,100
+600
| +11% | +$120K |
|
2743
CALL
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1.21M | ﹤0.01% |
165,500
+64,600
| +64% | +$401K |
|
2744
CALL
Grab
GRAB
$13.5B
| $1.21M | ﹤0.01% |
319,100
-990,200
| -76% | -$3.38M |
|
2745
PUT
Idexx Laboratories
IDXX
$42.9B
| $1.21M | ﹤0.01% |
2,400
| – | – |
|
2746
Solventum
SOLV
$13.5B
| $1.21M | ﹤0.01% |
17,390
-17,675
| -50% | -$1.06M |
|
2747
PUT
Guardant Health
GH
$19.5B
| $1.21M | ﹤0.01% |
52,800
-45,800
| -46% | -$1.3M |
|
2748
CALL
Immunovant
IMVT
$8.09B
| $1.21M | ﹤0.01% |
42,500
+2,900
| +7% | +$85.5K |
|
2749
Norfolk Southern
NSC
$78.8B
| $1.21M | ﹤0.01% |
+4,876
| New | +$1.17M |
|
|
SAFE
2750
CALL
Safehold
SAFE
$1.19B
| $1.21M | ﹤0.01% |
46,200
+28,600
| +163% | +$675K |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.