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 | |
|---|---|---|---|---|---|---|
|
TERN
3776
CALL
DELISTED
Terns Pharmaceuticals
TERN
| $520K | ﹤0.01% |
69,300
+37,600
| +119% | +$240K |
|
3777
PUT
Emcor
EME
$31.4B
| $519K | ﹤0.01% |
800
-3,400
| -81% | -$2.06M |
|
3778
CALL
Jack in the Box
JACK
$308M
| $519K | ﹤0.01% |
26,300
+17,200
| +189% | +$342K |
|
3779
CALL
Snap-on
SNA
$21.7B
| $519K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$458K |
|
3780
PUT
ARS Pharmaceuticals
SPRY
$563M
| $519K | ﹤0.01% |
51,700
+45,000
| +672% | +$646K |
|
3781
CALL
Global X MSCI Norway ETF
NORW
$85M
| $518K | ﹤0.01% |
10,200
-60,100
| -85% | -$1.77M |
|
3782
Solid Biosciences
SLDB
$785M
| $518K | ﹤0.01% |
+84,001
| New | +$491K |
|
|
AIRL
3783
PUT
DELISTED
Themes Airlines ETF
AIRL
| $517K | ﹤0.01% |
26,000
+23,700
| +1,030% | +$799K |
|
3784
PUT
Blue Bird Corp
BLBD
$2.34B
| $517K | ﹤0.01% |
9,000
-12,400
| -58% | -$647K |
|
3785
CALL
Blink Charging
BLNK
$74.1M
| $517K | ﹤0.01% |
315,500
+163,600
| +108% | +$182K |
|
3786
PUT
Americold
COLD
$4.17B
| $517K | ﹤0.01% |
42,300
+39,400
| +1,359% | +$587K |
|
3787
PUT
Columbia Sportswear
COLM
$3.3B
| $517K | ﹤0.01% |
9,900
+800
| +9% | +$45K |
|
3788
CALL
Pegasystems
PEGA
$4.85B
| $517K | ﹤0.01% |
9,000
-4,000
| -31% | -$220K |
|
3789
Rogers Corp
ROG
$2.13B
| $517K | ﹤0.01% |
6,431
+568
| +10% | +$42.3K |
|
3790
Scholar Rock
SRRK
$5.92B
| $517K | ﹤0.01% |
13,888
+9,416
| +211% | +$329K |
|
3791
PUT
Charles River Laboratories
CRL
$11.6B
| $516K | ﹤0.01% |
3,300
-8,700
| -73% | -$1.38M |
|
3792
PUT
Xerox
XRX
$360M
| $515K | ﹤0.01% |
137,200
+38,300
| +39% | +$169K |
|
3793
PUT
BBVA Argentina
BBAR
$3.85B
| $514K | ﹤0.01% |
61,800
-7,300
| -11% | -$98.6K |
|
|
PCH
3794
DELISTED
PotlatchDeltic
PCH
| $514K | ﹤0.01% |
+12,628
| New | +$523K |
|
3795
PUT
Regenxbio
RGNX
$615M
| $514K | ﹤0.01% |
53,300
+40,700
| +323% | +$360K |
|
3796
LendingTree
TREE
$572M
| $514K | ﹤0.01% |
7,954
+7,150
| +889% | +$412K |
|
3797
Energy Vault
NRGV
$498M
| $513K | ﹤0.01% |
172,819
+151,093
| +695% | +$248K |
|
3798
NETGEAR
NTGR
$663M
| $513K | ﹤0.01% |
15,841
-678
| -4% | -$18.5K |
|
3799
Molson Coors Class B
TAP
$7.97B
| $513K | ﹤0.01% |
+11,350
| New | +$560K |
|
3800
PUT
Ingersoll Rand
IR
$33.9B
| $512K | ﹤0.01% |
6,200
+1,500
| +32% | +$123K |
|
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.