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 | |
|---|---|---|---|---|---|---|
7251
CALL
MasterCraft Boat Holdings
MCFT
$607M
| $9K | ﹤0.01% |
500
-3,700
| -88% | -$70.4K |
|
7252
CALL
MiMedx Group
MDXG
$649M
| $9K | ﹤0.01% |
1,600
-12,800
| -89% | -$84.8K |
|
|
MGIC
7253
CALL
DELISTED
Magic Software Enterprises
MGIC
| $9K | ﹤0.01% |
800
-3,400
| -81% | -$36.9K |
|
7254
CALL
Manitowoc
MTW
$527M
| $9K | ﹤0.01% |
1,000
-1,400
| -58% | -$14.6K |
|
7255
PUT
NB Bancorp
NBBK
$1.01B
| $9K | ﹤0.01% |
500
| – | – |
|
7256
CALL
Natural Gas Services Group
NGS
$460M
| $9K | ﹤0.01% |
500
-200
| -29% | -$4K |
|
7257
PUT
Nicolet Bankshares
NIC
$3.65B
| $9K | ﹤0.01% |
+100
| New | +$9.35K |
|
7258
Nektar Therapeutics
NKTR
$2.39B
| $9K | ﹤0.01% |
466
+316
| +211% | +$6.02K |
|
7259
Nelnet
NNI
$4.92B
| $9K | ﹤0.01% |
+88
| New | +$9.66K |
|
7260
Nomad Foods
NOMD
$1.7B
| $9K | ﹤0.01% |
+481
| New | +$8.85K |
|
7261
OmniAb
OABI
$286M
| $9K | ﹤0.01% |
2,317
+374
| +19% | +$1.62K |
|
7262
PUT
OPAL Fuels
OPAL
$67.7M
| $9K | ﹤0.01% |
2,500
-7,800
| -76% | -$29.4K |
|
|
PKST
7263
CALL
DELISTED
Peakstone Realty Trust
PKST
| $9K | ﹤0.01% |
+700
| New | +$9.17K |
|
7264
PUT
Pinnacle Financial Partners Inc
PNFP
$15.9B
| $9K | ﹤0.01% |
+100
| New | +$9.2K |
|
7265
Porch Group
PRCH
$1.38B
| $9K | ﹤0.01% |
6,116
-15,938
| -72% | -$25K |
|
7266
PUT
Protagonist Therapeutics
PTGX
$8.8B
| $9K | ﹤0.01% |
200
+100
| +100% | +$4.04K |
|
7267
PUT
ProPetro Holding
PUMP
$1.31B
| $9K | ﹤0.01% |
1,200
-1,100
| -48% | -$8.98K |
|
7268
QuickLogic
QUIK
$217M
| $9K | ﹤0.01% |
1,264
-630
| -33% | -$5.8K |
|
7269
PUT
LiveRamp
RAMP
$2.29B
| $9K | ﹤0.01% |
400
-200
| -33% | -$5.46K |
|
|
REE
7270
DELISTED
REE Automotive
REE
| $9K | ﹤0.01% |
1,405
-1,092
| -44% | -$4.5K |
|
7271
CALL
RPC Inc
RES
$1.14B
| $9K | ﹤0.01% |
1,500
-26,400
| -95% | -$166K |
|
7272
The RMR Group
RMR
$343M
| $9K | ﹤0.01% |
358
-2,340
| -87% | -$57.8K |
|
7273
Invesco S&P 500 Pure Value ETF
RPV
$1.68B
| $9K | ﹤0.01% |
+109
| New | +$9.42K |
|
7274
PUT
RxSight
RXST
$250M
| $9K | ﹤0.01% |
+200
| New | +$10.2K |
|
7275
CALL
Sabesp
SBS
$19.4B
| $9K | ﹤0.01% |
3,094
-11,344
| -79% | -$36.2K |
|
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.