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 | |
|---|---|---|---|---|---|---|
4526
CALL
AnaptysBio
ANAB
$1.54B
| $197K | ﹤0.01% |
+5,900
| New | +$202K |
|
4527
Globant
GLOB
$1.65B
| $197K | ﹤0.01% |
+995
| New | +$192K |
|
|
SGMO
4528
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $197K | ﹤0.01% |
+227,900
| New | +$167K |
|
4529
Arvinas
ARVN
$530M
| $196K | ﹤0.01% |
+7,984
| New | +$208K |
|
4530
PUT
Citizens
CIA
$248M
| $196K | ﹤0.01% |
+54,200
| New | +$158K |
|
4531
Clearway Energy Class C
CWEN
$4.79B
| $196K | ﹤0.01% |
6,400
+4,740
| +286% | +$131K |
|
|
EFXT
4532
CALL
Enerflex
EFXT
$2.58B
| $196K | ﹤0.01% |
+33,000
| New | +$185K |
|
|
NGD
4533
CALL
DELISTED
New Gold Inc
NGD
| $196K | ﹤0.01% |
68,100
+34,300
| +101% | +$84.8K |
|
4534
PUT
nVent Electric
NVT
$21.6B
| $196K | ﹤0.01% |
2,800
+400
| +17% | +$27.6K |
|
4535
PagerDuty
PD
$830M
| $196K | ﹤0.01% |
+10,588
| New | +$207K |
|
4536
PUT
Safe Bulkers
SB
$772M
| $196K | ﹤0.01% |
37,900
-460,400
| -92% | -$2.37M |
|
4537
CALL
Blend Labs
BLND
$438M
| $195K | ﹤0.01% |
52,100
+21,600
| +71% | +$71.6K |
|
4538
PUT
Dorchester Minerals
DMLP
$1.3B
| $195K | ﹤0.01% |
6,500
-6,500
| -50% | -$199K |
|
4539
CALL
Nkarta
NKTX
$152M
| $195K | ﹤0.01% |
43,200
-3,000
| -6% | -$17K |
|
4540
CALL
GeneDx Holdings
WGS
$1.89B
| $195K | ﹤0.01% |
4,600
-400
| -8% | -$13.5K |
|
4541
PUT
Blackbaud
BLKB
$1.94B
| $194K | ﹤0.01% |
2,300
+1,600
| +229% | +$127K |
|
4542
Amplify CWP Enhanced Dividend Income ETF
DIVO
$7.45B
| $194K | ﹤0.01% |
+4,734
| New | +$188K |
|
|
DFTX
4543
PUT
Definium Therapeutics
DFTX
$5.6B
| $194K | ﹤0.01% |
34,100
+6,200
| +22% | +$43.1K |
|
4544
CALL
Omeros
OMER
$845M
| $194K | ﹤0.01% |
48,900
-12,400
| -20% | -$52.9K |
|
4545
PUT
Broadridge
BR
$18.4B
| $193K | ﹤0.01% |
900
-300
| -25% | -$62.7K |
|
4546
Direxion Daily Energy Bull 2X ETF
ERX
$231M
| $193K | ﹤0.01% |
3,260
-173
| -5% | -$10.7K |
|
4547
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$3.78B
| $193K | ﹤0.01% |
4,064
-3,319
| -45% | -$150K |
|
4548
CALL
MillerKnoll
MLKN
$1.56B
| $193K | ﹤0.01% |
7,800
-15,500
| -67% | -$431K |
|
|
SRDX
4549
PUT
DELISTED
Surmodics
SRDX
| $193K | ﹤0.01% |
+5,000
| New | +$202K |
|
4550
CALL
Timken Company
TKR
$9.19B
| $193K | ﹤0.01% |
2,300
-8,600
| -79% | -$707K |
|
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.