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 | |
|---|---|---|---|---|---|---|
4626
CALL
Carlyle Secured Lending
CGBD
$708M
| $178K | ﹤0.01% |
10,500
-6,200
| -37% | -$107K |
|
4627
CALL
Kilroy Realty
KRC
$4.59B
| $178K | ﹤0.01% |
4,600
+1,700
| +59% | +$60.1K |
|
4628
CALL
NOV
NOV
$6.84B
| $178K | ﹤0.01% |
11,200
-19,900
| -64% | -$353K |
|
4629
CALL
Redwire
RDW
$1.86B
| $178K | ﹤0.01% |
26,000
-9,500
| -27% | -$62.7K |
|
|
AMWD
4630
CALL
DELISTED
American Woodmark
AMWD
| $177K | ﹤0.01% |
1,900
-1,400
| -42% | -$126K |
|
4631
CALL
Annexon
ANNX
$796M
| $177K | ﹤0.01% |
30,000
+10,200
| +52% | +$60.5K |
|
4632
CALL
Blue Bird Corp
BLBD
$2.29B
| $177K | ﹤0.01% |
3,700
-15,500
| -81% | -$766K |
|
4633
Fulcrum Therapeutics
FULC
$241M
| $177K | ﹤0.01% |
49,764
-7,369
| -13% | -$54.7K |
|
4634
PUT
Helix Energy Solutions
HLX
$1.34B
| $177K | ﹤0.01% |
16,000
+1,900
| +13% | +$20.9K |
|
4635
Navitas Semiconductor
NVTS
$2.54B
| $177K | ﹤0.01% |
72,564
+39,287
| +118% | +$128K |
|
4636
PUT
Repay Holdings
RPAY
$335M
| $177K | ﹤0.01% |
+21,800
| New | +$192K |
|
4637
ProShares UltraShort S&P500
SDS
$435M
| $177K | ﹤0.01% |
1,716
+544
| +46% | +$61.3K |
|
4638
CALL
Atossa Therapeutics
ATOS
$23M
| $176K | ﹤0.01% |
7,760
-213
| -3% | -$4.3K |
|
4639
CALL
DMC Global
BOOM
$111M
| $176K | ﹤0.01% |
13,600
+12,900
| +1,843% | +$163K |
|
4640
Teucrium Corn Fund
CORN
$178M
| $176K | ﹤0.01% |
9,524
-1,344
| -12% | -$24K |
|
|
EVRI
4641
CALL
DELISTED
Everi Holdings
EVRI
| $176K | ﹤0.01% |
13,400
-36,800
| -73% | -$434K |
|
4642
PUT
MarineMax
HZO
$748M
| $176K | ﹤0.01% |
5,000
-2,300
| -32% | -$75K |
|
4643
CALL
Texas Pacific Land
TPL
$26.9B
| $176K | ﹤0.01% |
+600
| New | +$165K |
|
4644
PUT
Twist Bioscience
TWST
$5.32B
| $176K | ﹤0.01% |
3,900
-16,900
| -81% | -$804K |
|
4645
PUT
Vicor
VICR
$8.33B
| $176K | ﹤0.01% |
4,200
+1,900
| +83% | +$70.7K |
|
4646
Allegion
ALLE
$13.5B
| $175K | ﹤0.01% |
1,202
+1,112
| +1,236% | +$147K |
|
4647
Cellebrite
CLBT
$3.76B
| $175K | ﹤0.01% |
10,396
-63,291
| -86% | -$939K |
|
4648
CALL
Clearway Energy Class C
CWEN
$4.79B
| $175K | ﹤0.01% |
5,800
+1,700
| +41% | +$47K |
|
4649
Editas Medicine
EDIT
$399M
| $175K | ﹤0.01% |
51,376
-18,916
| -27% | -$82.3K |
|
4650
PUT
National Fuel Gas
NFG
$7.69B
| $175K | ﹤0.01% |
2,900
-2,100
| -42% | -$123K |
|
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.