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 | |
|---|---|---|---|---|---|---|
3376
CALL
NGL Energy Partners
NGL
$1.87B
| $727K | ﹤0.01% |
121,200
+109,800
| +963% | +$552K |
|
3377
CALL
CMS Energy
CMS
$23.5B
| $725K | ﹤0.01% |
9,900
-38,200
| -79% | -$2.74M |
|
3378
PUT
Heritage Financial
HFWA
$1.22B
| $725K | ﹤0.01% |
30,000
| – | – |
|
3379
Sabra Healthcare REIT
SBRA
$5.7B
| $725K | ﹤0.01% |
+38,946
| New | +$727K |
|
3380
Sweetgreen
SG
$738M
| $724K | ﹤0.01% |
90,777
+16,138
| +22% | +$175K |
|
3381
CALL
Expeditors International
EXPD
$22.5B
| $723K | ﹤0.01% |
5,900
+5,600
| +1,867% | +$666K |
|
|
GOLD
3382
Gold.com Inc
GOLD
$1.17B
| $722K | ﹤0.01% |
27,911
+26,445
| +1,804% | +$626K |
|
3383
Immunome
IMNM
$2.54B
| $722K | ﹤0.01% |
61,693
+34,094
| +124% | +$339K |
|
|
TGB
3384
Trekor Metals
TGB
$2.45B
| $722K | ﹤0.01% |
+170,864
| New | +$581K |
|
3385
Corsair Gaming
CRSR
$1.08B
| $721K | ﹤0.01% |
+80,904
| New | +$729K |
|
3386
FIVE9
FIVN
$2.02B
| $721K | ﹤0.01% |
+29,809
| New | +$788K |
|
3387
Trump Media & Technology Group
DJT
$2.55B
| $720K | ﹤0.01% |
+43,884
| New | +$778K |
|
3388
CALL
ThredUp
TDUP
$733M
| $719K | ﹤0.01% |
76,100
+18,300
| +32% | +$173K |
|
3389
CALL
Jackson Financial
JXN
$8.48B
| $718K | ﹤0.01% |
7,100
+2,300
| +48% | +$215K |
|
3390
PUT
Legend Biotech
LEGN
$3.67B
| $717K | ﹤0.01% |
22,000
+2,100
| +11% | +$77.5K |
|
|
CIM
3391
Chimera Investment
CIM
$1.06B
| $715K | ﹤0.01% |
54,140
+41,994
| +346% | +$584K |
|
3392
CALL
Contango Silver & Gold Inc
CTGO
$522M
| $715K | ﹤0.01% |
+28,700
| New | +$610K |
|
3393
CALL
Inter&Co
INTR
$2.46B
| $715K | ﹤0.01% |
77,500
+72,700
| +1,515% | +$571K |
|
3394
CALL
Phathom Pharmaceuticals
PHAT
$961M
| $715K | ﹤0.01% |
60,800
-48,100
| -44% | -$496K |
|
3395
CALL
Geospace Technologies
GEOS
$88.7M
| $714K | ﹤0.01% |
37,700
+32,100
| +573% | +$520K |
|
3396
PUT
Vanguard FTSE Europe ETF
VGK
$30.1B
| $714K | ﹤0.01% |
8,900
+2,400
| +37% | +$188K |
|
|
XIFR
3397
XPLR Infrastructure LP
XIFR
$1.13B
| $714K | ﹤0.01% |
+70,270
| New | +$680K |
|
3398
PUT
AerCap
AER
$23.9B
| $713K | ﹤0.01% |
5,900
-11,100
| -65% | -$1.3M |
|
|
BTC
3399
CALL
Grayscale Bitcoin Mini Trust ETF
BTC
$3.34B
| $713K | ﹤0.01% |
14,100
-4,700
| -25% | -$238K |
|
3400
PUT
Life Time Group Holdings
LTH
$9.85B
| $712K | ﹤0.01% |
25,800
-92,700
| -78% | -$2.64M |
|
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.