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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1651
PUT
Doximity
DOCS
$3.67B
| $4.12M | ﹤0.01% |
56,300
-49,000
| -47% | -$3.19M |
|
|
PPLT
1652
PUT
abrdn Physical Platinum Shares ETF
PPLT
$1.81B
| $4.11M | ﹤0.01% |
288,000
+122,000
| +73% | +$1.54M |
|
1653
CALL
Franklin Resources
BEN
$16.9B
| $4.1M | ﹤0.01% |
177,400
-26,200
| -13% | -$648K |
|
1654
PUT
Floor & Decor
FND
$5.81B
| $4.1M | ﹤0.01% |
55,600
-30,600
| -35% | -$2.51M |
|
|
SEI
1655
CALL
Solaris Energy Infrastructure
SEI
$3.31B
| $4.09M | ﹤0.01% |
102,400
+97,000
| +1,796% | +$3.03M |
|
1656
CALL
Virgin Galactic
SPCE
$320M
| $4.09M | ﹤0.01% |
1,076,600
+112,300
| +12% | +$376K |
|
1657
CALL
Aptiv
APTV
$12B
| $4.09M | ﹤0.01% |
47,400
-30,400
| -39% | -$2.29M |
|
1658
CALL
NexGen Energy
NXE
$6.05B
| $4.08M | ﹤0.01% |
456,300
+236,000
| +107% | +$1.74M |
|
1659
PUT
ResMed
RMD
$28.3B
| $4.08M | ﹤0.01% |
14,900
-1,000
| -6% | -$273K |
|
|
KEEL
1660
Keel Infrastructure Corp
KEEL
$2.57B
| $4.07M | ﹤0.01% |
1,441,997
+900,529
| +166% | +$1.4M |
|
1661
PUT
Barclays
BCS
$94.1B
| $4.07M | ﹤0.01% |
196,700
+113,600
| +137% | +$2.25M |
|
|
PPL
1662
CALL
PPL Corp
PPL
$27.3B
| $4.07M | ﹤0.01% |
109,400
+66,000
| +152% | +$2.37M |
|
|
WW
1663
CALL
WW International
WW
$133M
| $4.07M | ﹤0.01% |
+148,600
| New | +$5.11M |
|
|
HIVE
1664
CALL
HIVE Digital Technologies
HIVE
$792M
| $4.06M | ﹤0.01% |
1,007,600
+792,300
| +368% | +$2.13M |
|
1665
PUT
NetApp
NTAP
$32.9B
| $4.05M | ﹤0.01% |
34,200
-31,900
| -48% | -$3.57M |
|
|
SLNO
1666
PUT
DELISTED
Soleno Therapeutics
SLNO
| $4.05M | ﹤0.01% |
59,900
+33,200
| +124% | +$2.46M |
|
|
DAY
1667
CALL
DELISTED
Dayforce
DAY
| $4.04M | ﹤0.01% |
58,700
+56,400
| +2,452% | +$3.51M |
|
1668
PUT
Matsons
MATX
$6.37B
| $4.04M | ﹤0.01% |
41,000
+33,500
| +447% | +$3.58M |
|
1669
CALL
Logitech
LOGI
$15.2B
| $4.04M | ﹤0.01% |
36,800
-700
| -2% | -$70.4K |
|
1670
CALL
Invesco
IVZ
$13.3B
| $4.02M | ﹤0.01% |
175,400
+54,500
| +45% | +$1.13M |
|
1671
CALL
Darling Ingredients
DAR
$9.93B
| $4.02M | ﹤0.01% |
130,300
+29,000
| +29% | +$969K |
|
1672
PUT
Magnite
MGNI
$2.65B
| $4.02M | ﹤0.01% |
184,700
+4,000
| +2% | +$94.5K |
|
1673
PUT
Citizens Financial Group
CFG
$30.4B
| $4.02M | ﹤0.01% |
75,600
+31,800
| +73% | +$1.58M |
|
1674
ARK Genomic Revolution ETF
ARKG
$1.51B
| $4.02M | ﹤0.01% |
144,684
+106,236
| +276% | +$2.68M |
|
|
WNS
1675
CALL
DELISTED
WNS Holdings
WNS
| $4.01M | ﹤0.01% |
52,600
+52,100
| +10,420% | +$3.9M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.