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 | |
|---|---|---|---|---|---|---|
3576
Ovintiv
OVV
$16.4B
| $613K | ﹤0.01% |
15,191
-17,715
| -54% | -$723K |
|
3577
SiriusXM
SIRI
$10.7B
| $613K | ﹤0.01% |
+26,370
| New | +$610K |
|
3578
PUT
PACS Group
PACS
$7.43B
| $613K | ﹤0.01% |
44,700
+3,600
| +9% | +$42.2K |
|
3579
Iovance Biotherapeutics
IOVA
$2.1B
| $612K | ﹤0.01% |
282,160
-4,429
| -2% | -$10.5K |
|
3580
PUT
TriplePoint Venture Growth BDC
TPVG
$185M
| $611K | ﹤0.01% |
105,900
+102,700
| +3,209% | +$683K |
|
3581
CALL
National Grid
NGG
$81.3B
| $610K | ﹤0.01% |
8,521
+4,768
| +127% | +$334K |
|
3582
Patrick Industries
PATK
$2.91B
| $610K | ﹤0.01% |
+5,907
| New | +$621K |
|
3583
CALL
Rogers Communications
RCI
$18.8B
| $610K | ﹤0.01% |
17,700
-8,300
| -32% | -$286K |
|
3584
CALL
Algoma Steel
ASTL
$463M
| $609K | ﹤0.01% |
171,500
+59,300
| +53% | +$315K |
|
|
SW
3585
PUT
Smurfit Westrock
SW
$26.6B
| $608K | ﹤0.01% |
14,300
-21,000
| -59% | -$950K |
|
3586
CALL
Kanzhun
BZ
$7.07B
| $607K | ﹤0.01% |
26,000
+12,400
| +91% | +$266K |
|
3587
PUT
Innoviz Technologies
INVZ
$99.5M
| $607K | ﹤0.01% |
298,000
+100
| +0% | +$170 |
|
3588
MannKind Corp
MNKD
$1.21B
| $607K | ﹤0.01% |
+113,137
| New | +$496K |
|
3589
PUT
Build-A-Bear
BBW
$443M
| $606K | ﹤0.01% |
9,300
+5,100
| +121% | +$301K |
|
3590
PUT
CryoPort
CYRX
$765M
| $605K | ﹤0.01% |
63,900
+13,500
| +27% | +$114K |
|
3591
Hawaiian Electric Industries
HE
$2.28B
| $605K | ﹤0.01% |
54,806
-5,941
| -10% | -$67.7K |
|
3592
Algonquin Power & Utilities
AQN
$4.68B
| $604K | ﹤0.01% |
+112,633
| New | +$647K |
|
|
SAFE
3593
CALL
Safehold
SAFE
$1.19B
| $604K | ﹤0.01% |
39,000
-400
| -1% | -$6.18K |
|
3594
PUT
Clean Harbors
CLH
$16B
| $603K | ﹤0.01% |
2,600
-7,600
| -75% | -$1.8M |
|
3595
Equinor
EQNR
$90.9B
| $603K | ﹤0.01% |
+24,765
| New | +$621K |
|
3596
CALL
US Gold Corp
USAU
$209M
| $603K | ﹤0.01% |
36,600
+14,100
| +63% | +$180K |
|
|
EMX
3597
DELISTED
EMX Royalty
EMX
| $602K | ﹤0.01% |
116,897
+94,054
| +412% | +$325K |
|
3598
CALL
Invesco CurrencyShares Swiss Franc Trust
FXF
$409M
| $600K | ﹤0.01% |
5,400
-1,400
| -21% | -$155K |
|
3599
CALL
NovaGold Resources
NG
$2.55B
| $600K | ﹤0.01% |
68,200
+15,600
| +30% | +$95.4K |
|
3600
CALL
Wave Life Sciences
WVE
$1.13B
| $600K | ﹤0.01% |
82,000
+71,800
| +704% | +$581K |
|
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.