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 | |
|---|---|---|---|---|---|---|
|
QXO
1551
PUT
QXO Inc
QXO
$14.2B
| $4.55M | ﹤0.01% |
238,900
-110,700
| -32% | -$2.29M |
|
1552
CALL
Summit Therapeutics
SMMT
$10.6B
| $4.55M | ﹤0.01% |
220,300
-131,800
| -37% | -$3.2M |
|
1553
CALL
Viavi Solutions
VIAV
$9.75B
| $4.55M | ﹤0.01% |
358,700
+354,200
| +7,871% | +$3.9M |
|
1554
PUT
Match Group
MTCH
$8.84B
| $4.54M | ﹤0.01% |
128,700
+12,100
| +10% | +$432K |
|
1555
CALL
Albertsons Companies
ACI
$5.4B
| $4.54M | ﹤0.01% |
259,500
+12,700
| +5% | +$249K |
|
1556
CALL
Annaly Capital Management
NLY
$16.9B
| $4.54M | ﹤0.01% |
224,600
-24,900
| -10% | -$516K |
|
|
HSAI
1557
CALL
Hesai Group
HSAI
$2.29B
| $4.54M | ﹤0.01% |
161,500
-44,400
| -22% | -$1.09M |
|
1558
PUT
GE HealthCare
GEHC
$27.6B
| $4.54M | ﹤0.01% |
60,400
+21,900
| +57% | +$1.63M |
|
1559
CALL
Invitation Homes
INVH
$17.7B
| $4.53M | ﹤0.01% |
154,600
+15,600
| +11% | +$481K |
|
1560
Halliburton
HAL
$27.9B
| $4.53M | ﹤0.01% |
184,168
+133,941
| +267% | +$2.96M |
|
1561
PUT
Quest Diagnostics
DGX
$25.1B
| $4.52M | ﹤0.01% |
23,700
-25,400
| -52% | -$4.51M |
|
1562
Credo Technology Group
CRDO
$39.7B
| $4.51M | ﹤0.01% |
30,997
-4,218
| -12% | -$516K |
|
1563
CALL
Kimberly-Clark
KMB
$36.4B
| $4.51M | ﹤0.01% |
36,300
-3,800
| -9% | -$491K |
|
1564
UBS Group
UBS
$170B
| $4.51M | ﹤0.01% |
109,948
+74,402
| +209% | +$2.89M |
|
1565
CALL
Plains GP Holdings
PAGP
$5.23B
| $4.5M | ﹤0.01% |
246,700
-92,300
| -27% | -$1.76M |
|
1566
CALL
Range Resources
RRC
$9.11B
| $4.49M | ﹤0.01% |
119,400
-10,900
| -8% | -$389K |
|
1567
PUT
CoreCivic
CXW
$3.1B
| $4.49M | ﹤0.01% |
220,800
-7,200
| -3% | -$149K |
|
1568
NuScale Power
SMR
$2.8B
| $4.49M | ﹤0.01% |
124,678
+44,304
| +55% | +$1.77M |
|
1569
Roblox
RBLX
$34B
| $4.49M | ﹤0.01% |
+32,383
| New | +$4.02M |
|
1570
PUT
YPF
YPF
$20.2B
| $4.48M | ﹤0.01% |
184,500
-39,800
| -18% | -$1.22M |
|
1571
CALL
Enbridge
ENB
$124B
| $4.48M | ﹤0.01% |
88,800
-45,900
| -34% | -$2.16M |
|
1572
CALL
Rambus
RMBS
$10.4B
| $4.48M | ﹤0.01% |
43,000
+19,500
| +83% | +$1.5M |
|
1573
PUT
NiSource
NI
$22.4B
| $4.48M | ﹤0.01% |
103,400
-2,500
| -2% | -$104K |
|
1574
CALL
Restaurant Brands International
QSR
$25.1B
| $4.47M | ﹤0.01% |
69,700
-19,300
| -22% | -$1.27M |
|
|
RZLV
1575
CALL
Rezolve AI
RZLV
$893M
| $4.47M | ﹤0.01% |
897,600
+807,700
| +898% | +$3.18M |
|
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.